How to open in default browser in C#

Take a look at the GeckoFX control.

GeckoFX is an open-source component which makes it easy to embed Mozilla Gecko (Firefox) into any .NET Windows Forms application. Written in clean, fully commented C#, GeckoFX is the perfect replacement for the default Internet Explorer-based WebBrowser control.

AngularJS $watch window resize inside directive

You can listen resize event and fire where some dimension change

directive

(function() {
'use strict';

    angular
    .module('myApp.directives')
    .directive('resize', ['$window', function ($window) {
        return {
            link: link,
            restrict: 'A'
        };

        function link(scope, element, attrs){
            scope.width = $window.innerWidth;
            function onResize(){
                // uncomment for only fire when $window.innerWidth change   
                // if (scope.width !== $window.innerWidth)
                {
                    scope.width = $window.innerWidth;
                    scope.$digest();
                }
            };

            function cleanUp() {
                angular.element($window).off('resize', onResize);
            }

            angular.element($window).on('resize', onResize);
            scope.$on('$destroy', cleanUp);
        }
    }]);
})();

In html

<div class="row" resize> ,
    <div class="col-sm-2 col-xs-6" ng-repeat="v in tag.vod"> 
        <h4 ng-bind="::v.known_as"></h4>
    </div> 
</div>

Controller :

$scope.$watch('width', function(old, newv){
     console.log(old, newv);
 })

js window.open then print()

<script type="text/javascript">

    function printDiv(divName) {
         var printContents = document.getElementById(divName).innerHTML;
         var originalContents = document.body.innerHTML;
         document.body.innerHTML = printContents;
         window.print();
         document.body.innerHTML = originalContents;
    }

</script>


<div id="printableArea">CONTENT TO PRINT</div>



<input type="button" onclick="printDiv('printableArea')" value="Print Report" />

Open link in new tab or window

It shouldn't be your call to decide whether the link should open in a new tab or a new window, since ultimately this choice should be done by the settings of the user's browser. Some people like tabs; some like new windows.

Using _blank will tell the browser to use a new tab/window, depending on the user's browser configuration and how they click on the link (e.g. middle click, Ctrl+click, or normal click).

Installing Python 2.7 on Windows 8

there is a simple procedure to do it go to controlpanel->system and security ->system->advanced system settings->advanced->environment variables then add new path enter this in your variable path and values

jQuery window scroll event does not fire up

Declare your jQuery between <script> and </script> in the <head>,
Wrap your .scroll() event within

$(document).ready(function(){
  //do something
});

How to make PopUp window in java

Hmm it has been a little while but from what I remember...
If you want a custom window you can just make a new frame and make it show up just like you would with the main window. Java also has a great dialog library that you can check out here:

How to Make Dialogs

That may be able to give you the functionality you are looking for with a whole lot less effort.

Object[] possibilities = {"ham", "spam", "yam"};
String s = (String)JOptionPane.showInputDialog(
                    frame,
                    "Complete the sentence:\n"
                    + "\"Green eggs and...\"",
                    "Customized Dialog",
                    JOptionPane.PLAIN_MESSAGE,
                    icon,
                    possibilities,
                    "ham");

//If a string was returned, say so.
if ((s != null) && (s.length() > 0)) {
    setLabel("Green eggs and... " + s + "!");
    return;
}

//If you're here, the return value was null/empty.
setLabel("Come on, finish the sentence!");

If you do not care to limit the user's choices, you can either use a form of the showInputDialog method that takes fewer arguments or specify null for the array of objects. In the Java look and feel, substituting null for possibilities results in a dialog that has a text field and looks like this:

How to create a WPF Window without a border that can be resized via a grip only?

I was having difficulty getting the answer by @fernando-aguirre using WindowChrome to work. It was not working in my case because I was overriding OnSourceInitialized in the MainWindow and not calling the base class method.

protected override void OnSourceInitialized(EventArgs e)
{
    ViewModel.Initialize(this);
    base.OnSourceInitialized(e); // <== Need to call this!
}

This stumped me for a very long time.

What's the difference between window.location= and window.location.replace()?

TLDR;

use location.href or better use window.location.href;

However if you read this you will gain undeniable proof.

The truth is it's fine to use but why do things that are questionable. You should take the higher road and just do it the way that it probably should be done.

location = "#/mypath/otherside"
var sections = location.split('/')

This code is perfectly correct syntax-wise, logic wise, type-wise you know the only thing wrong with it?

it has location instead of location.href

what about this

var mystring = location = "#/some/spa/route"

what is the value of mystring? does anyone really know without doing some test. No one knows what exactly will happen here. Hell I just wrote this and I don't even know what it does. location is an object but I am assigning a string will it pass the string or pass the location object. Lets say there is some answer to how this should be implemented. Can you guarantee all browsers will do the same thing?

This i can pretty much guess all browsers will handle the same.

var mystring = location.href = "#/some/spa/route"

What about if you place this into typescript will it break because the type compiler will say this is suppose to be an object?

This conversation is so much deeper than just the location object however. What this conversion is about what kind of programmer you want to be?

If you take this short-cut, yea it might be okay today, ye it might be okay tomorrow, hell it might be okay forever, but you sir are now a bad programmer. It won't be okay for you and it will fail you.

There will be more objects. There will be new syntax.

You might define a getter that takes only a string but returns an object and the worst part is you will think you are doing something correct, you might think you are brilliant for this clever method because people here have shamefully led you astray.

var Person.name = {first:"John":last:"Doe"}
console.log(Person.name) // "John Doe"

With getters and setters this code would actually work, but just because it can be done doesn't mean it's 'WISE' to do so.

Most people who are programming love to program and love to get better. Over the last few years I have gotten quite good and learn a lot. The most important thing I know now especially when you write Libraries is consistency and predictability.

Do the things that you can consistently do.

+"2" <-- this right here parses the string to a number. should you use it? or should you use parseInt("2")?

what about var num =+"2"?

From what you have learn, from the minds of stackoverflow i am not too hopefully.

If you start following these 2 words consistent and predictable. You will know the right answer to a ton of questions on stackoverflow.

Let me show you how this pays off. Normally I place ; on every line of javascript i write. I know it's more expressive. I know it's more clear. I have followed my rules. One day i decided not to. Why? Because so many people are telling me that it is not needed anymore and JavaScript can do without it. So what i decided to do this. Now because I have become sure of my self as a programmer (as you should enjoy the fruit of mastering a language) i wrote something very simple and i didn't check it. I erased one comma and I didn't think I needed to re-test for such a simple thing as removing one comma.

I wrote something similar to this in es6 and babel

var a = "hello world"
(async function(){
  //do work
})()

This code fail and took forever to figure out. For some reason what it saw was

var a = "hello world"(async function(){})()

hidden deep within the source code it was telling me "hello world" is not a function.

For more fun node doesn't show the source maps of transpiled code.

Wasted so much stupid time. I was presenting to someone as well about how ES6 is brilliant and then I had to start debugging and demonstrate how headache free and better ES6 is. Not convincing is it.

I hope this answered your question. This being an old question it's more for the future generation, people who are still learning.

Question when people say it doesn't matter either way works. Chances are a wiser more experienced person will tell you other wise.

what if someone overwrite the location object. They will do a shim for older browsers. It will get some new feature that needs to be shimmed and your 3 year old code will fail.

My last note to ponder upon.

Writing clean, clear purposeful code does something for your code that can't be answer with right or wrong. What it does is it make your code an enabler.

You can use more things plugins, Libraries with out fear of interruption between the codes.

for the record. use

window.location.href

How can I open a Shell inside a Vim Window?

I guess this is a fairly old question, but now in 2017. We have neovim, which is a fork of vim which adds terminal support.

So invoking :term would open a terminal window. The beauty of this solution as opposed to using tmux (a terminal multiplexer) is that you'll have the same window bindings as your vim setup. neovim is compatible with vim, so you can basically copy and paste your .vimrc and it will just work.

More advantages are you can switch to normal mode on the opened terminal and you can do basic copy and editing. It is also pretty useful for git commits too I guess, since everything in your buffer you can use in auto-complete.

I'll update this answer since vim is also planning to release terminal support, probably in vim 8.1. You can follow the progress here: https://groups.google.com/forum/#!topic/vim_dev/Q9gUWGCeTXM

Once it's released, I do believe this is a more superior setup than using tmux.

How to run function of parent window when child window closes?

The answers as they are require you to add code to the spawned window. That is unnecessary coupling.

// In parent window
var pop = open(url);
pop.onunload = function() {
  // Run your code, the popup window is unloading
  // Beware though, this will also fire if the user navigates to a different
  // page within thepopup. If you need to support that, you will have to play around
  // with pop.closed and setTimeouts
}

How do I handle the window close event in Tkinter?

You should use destroy() to close a tkinter window.

   from Tkinter import *
   root = Tk()
   Button(root, text="Quit", command=root.destroy).pack()
   root.mainloop()

Explanation:

root.quit() The above line just Bypasses the root.mainloop() i.e root.mainloop() will still be running in background if quit() command is executed.

root.destroy() While destroy() command vanish out root.mainloop() i.e root.mainloop() stops.

So as you just want to quit the program so you should use root.destroy() as it will it stop the mainloop()`.

But if you want to run some infinite loop and you don't want to destroy your Tk window and want to execute some code after root.mainloop() line then you should use root.quit(). Ex:

from Tkinter import *
def quit():
    global root
    root.quit()

root = Tk()
while True:
    Button(root, text="Quit", command=quit).pack()
    root.mainloop()
    #do something

Open button in new window?

<input type="button" onclick="window.open(); return false;" value="click me" />

http://www.javascript-coder.com/window-popup/javascript-window-open.phtml

window.close() doesn't work - Scripts may close only the windows that were opened by it

You can't close a current window or any window or page that is opened using '_self' But you can do this

var customWindow = window.open('', '_blank', '');
    customWindow.close();

How to increase the vertical split window size in Vim

This is what I am using as of now:

nnoremap <silent> <Leader>= :exe "resize " . (winheight(0) * 3/2)<CR>
nnoremap <silent> <Leader>- :exe "resize " . (winheight(0) * 2/3)<CR>
nnoremap <silent> <Leader>0 :exe "vertical resize " . (winwidth(0) * 3/2)<CR>
nnoremap <silent> <Leader>9 :exe "vertical resize " . (winwidth(0) * 2/3)<CR>

Fastest way(s) to move the cursor on a terminal command line?

first: export EDITOR='nano -m'

then: CTRL+X CTRL+E in sequence.

You current line will open in nano editor with mouse enable. You can click in any part of text and edit

then CTRL+X to exit and y to confirm saving.

Get viewport/window height in ReactJS

Using Hooks (React 16.8.0+)

Create a useWindowDimensions hook.

import { useState, useEffect } from 'react';

function getWindowDimensions() {
  const { innerWidth: width, innerHeight: height } = window;
  return {
    width,
    height
  };
}

export default function useWindowDimensions() {
  const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());

  useEffect(() => {
    function handleResize() {
      setWindowDimensions(getWindowDimensions());
    }

    window.addEventListener('resize', handleResize);
    return () => window.removeEventListener('resize', handleResize);
  }, []);

  return windowDimensions;
}

And after that you'll be able to use it in your components like this

const Component = () => {
  const { height, width } = useWindowDimensions();

  return (
    <div>
      width: {width} ~ height: {height}
    </div>
  );
}

Working example

Original answer

It's the same in React, you can use window.innerHeight to get the current viewport's height.

As you can see here

How to change the Title of the window in Qt?

I know this is years later but I ran into the same problem. The solution I found was to change the window title in main.cpp. I guess once the w.show(); is called the window title can no longer be changed. In my case I just wanted the title to reflect the current directory and it works.

int main(int argc, char *argv[]) 
{
QApplication a(argc, argv);
MainWindow w;
w.setWindowTitle(QDir::currentPath());
w.show();

return a.exec();
}

What's the difference between the Window.Loaded and Window.ContentRendered events

This is not about the difference between Window.ContentRendered and Window.Loaded but about what how the Window.Loaded event can be used:

I use it to avoid splash screens in all applications which need a long time to come up.

    // initializing my main window
    public MyAppMainWindow()
    {
        InitializeComponent();

        // Set the event
        this.ContentRendered += MyAppMainWindow_ContentRendered;
    }

    private void MyAppMainWindow_ContentRendered(object sender, EventArgs e)
    {
        // ... comes up quick when the controls are loaded and rendered

        // unset the event
        this.ContentRendered -= MyAppMainWindow_ContentRendered;

        // ... make the time comsuming init stuff here
    }

$(window).scrollTop() vs. $(document).scrollTop()

I've just had some of the similar problems with scrollTop described here.

In the end I got around this on Firefox and IE by using the selector $('*').scrollTop(0);

Not perfect if you have elements you don't want to effect but it gets around the Document, Body, HTML and Window disparity. If it helps...

Finding the handle to a WPF window

If you want window handles for ALL of your application's Windows for some reason, you can use the Application.Windows property to get at all the Windows and then use WindowInteropHandler to get at their handles as you have already demonstrated.

How can I resize an image dynamically with CSS as the browser width/height changes?

Set the resize property to both. Then you can change width and height like this:

.classname img{
  resize: both;
  width:50px;
  height:25px;
}

How to recover closed output window in netbeans?

Just go through "View" and select IDE Log. it will show the output.

How to position a div in the middle of the screen when the page is bigger than the screen

just add position:fixed and it will keep it in view even if you scroll down. see it at http://jsfiddle.net/XEUbc/1/

#mydiv {
    position:fixed;
    top: 50%;
    left: 50%;
    width:30em;
    height:18em;
    margin-top: -9em; /*set to a negative number 1/2 of your height*/
    margin-left: -15em; /*set to a negative number 1/2 of your width*/
    border: 1px solid #ccc;
    background-color: #f3f3f3;
}

Send parameter to Bootstrap modal window?

There is a better solution than the accepted answer, specifically using data-* attributes. Setting the id to 1 will cause you issues if any other element on the page has id=1. Instead, you can do:

<button class="btn btn-primary" data-toggle="modal" data-target="#yourModalID" data-yourparameter="whateverYouWant">Load</button>

<script>
$('#yourModalID').on('show.bs.modal', function(e) {
  var yourparameter = e.relatedTarget.dataset.yourparameter;
  // Do some stuff w/ it.
});
</script>

How do I insert a JPEG image into a python Tkinter window?

from tkinter import *
from PIL import ImageTk, Image

window = Tk()
window.geometry("1000x300")

path = "1.jpg"

image = PhotoImage(Image.open(path))

panel = Label(window, image = image)

panel.pack()

window.mainloop()

Is there a way to detect if a browser window is not currently active?

In HTML 5 you could also use:

onpageshow: Script to be run when the window becomes visible
onpagehide: Script to be run when the window is hidden

See:

How to make HTML open a hyperlink in another window or tab?

<a href="http://www.starfall.com/" target="_blank">Starfall</a>

Whether it opens in a tab or another window though is up to how a user has configured her browser.

Change window location Jquery

If you want to use the back button, check this out. https://stackoverflow.com/questions/116446/what-is-the-best-back-button-jquery-plugin

Use document.location.href to change the page location, place it in the function on a successful ajax run.

window.location.href and window.open () methods in JavaScript

window.open will open a new browser with the specified URL.
window.location.href will open the URL in the window in which the code is called.

Note also that window.open() is a function on the window object itself whereas window.location is an object that exposes a variety of other methods and properties.

How to terminate a window in tmux?

For me solution looks like:

ctrl+b q to show pane numbers.
ctrl+b x to kill pane.

Killing last pane will kill window.

Javascript window.open pass values using POST

Thank you php-b-grader. I improved the code, it is not necessary to use window.open(), the target is already specified in the form.

// Create a form
var mapForm = document.createElement("form");
mapForm.target = "_blank";    
mapForm.method = "POST";
mapForm.action = "abmCatalogs.ftl";

// Create an input
var mapInput = document.createElement("input");
mapInput.type = "text";
mapInput.name = "variable";
mapInput.value = "lalalalala";

// Add the input to the form
mapForm.appendChild(mapInput);

// Add the form to dom
document.body.appendChild(mapForm);

// Just submit
mapForm.submit();

for target options --> w3schools - Target

CMD command to check connected USB devices

You can use the wmic command:

wmic path CIM_LogicalDevice where "Description like 'USB%'" get /value

tkinter: Open a new window with a button prompt

Here's the nearly shortest possible solution to your question. The solution works in python 3.x. For python 2.x change the import to Tkinter rather than tkinter (the difference being the capitalization):

import tkinter as tk
#import Tkinter as tk  # for python 2
    
def create_window():
    window = tk.Toplevel(root)

root = tk.Tk()
b = tk.Button(root, text="Create new window", command=create_window)
b.pack()

root.mainloop()

This is definitely not what I recommend as an example of good coding style, but it illustrates the basic concepts: a button with a command, and a function that creates a window.

How do I get the offset().top value of an element without using jQuery?

use getBoundingClientRect if $el is the actual DOM object:

var top = $el.getBoundingClientRect().top;

~~JSFiddle~~

~~Fiddle will show that this will get the same value that jquery's offset top will give you~~

Edit: as mentioned in comments this does not account for scrolled content, below is the code that jQuery uses

https://github.com/jquery/jquery/blob/master/src/offset.js (5/13/2015)

offset: function( options ) {
    //...

    var docElem, win, rect, doc,
        elem = this[ 0 ];

    if ( !elem ) {
        return;
    }

    rect = elem.getBoundingClientRect();

    // Make sure element is not hidden (display: none) or disconnected
    if ( rect.width || rect.height || elem.getClientRects().length ) {
        doc = elem.ownerDocument;
        win = getWindow( doc );
        docElem = doc.documentElement;

        return {
            top: rect.top + win.pageYOffset - docElem.clientTop,
            left: rect.left + win.pageXOffset - docElem.clientLeft
        };
    }
}

Popup window in winform c#

Just create another form (let's call it formPopup) using Visual Studio. In a button handler write the following code:

var formPopup = new Form();
formPopup.Show(this); // if you need non-modal window

If you need a non-modal window use: formPopup.Show();. If you need a dialog (so your code will hang on this invocation until you close the opened form) use: formPopup.ShowDialog()

Javascript: open new page in same window

I'd take that a slightly different way if I were you. Change the text link when the page loads, not on the click. I'll give the example in jQuery, but it could easily be done in vanilla javascript (though, jQuery is nicer)

$(function() {
    $('a[href$="url="]')    // all links whose href ends in "url="
        .each(function(i, el) {
            this.href += escape(document.location.href);
        })
    ;
});

and write your HTML like this:

<a href="http://example.com/submit.php?url=">...</a>

the benefits of this are that people can see what they're clicking on (the href is already set), and it removes the javascript from your HTML.

All this said, it looks like you're using PHP... why not add it in server-side?

JavaScript - Get Browser Height

With JQuery you can try this $(window).innerHeight() (Works for me on Chrome, FF and IE). With bootstrap modal I used something like the following;

$('#YourModal').on('show.bs.modal', function () {
    $('.modal-body').css('height', $(window).innerHeight() * 0.7);
});

the MySQL service on local computer started and then stopped

If you came across this while installing WAMP64 on Windows 10. Check if data folder in MySQL folder is missing. My WAMP 3.2.3 version installation failed to create such a folder. So wamp icon was orange (1 of 2 services running).

A quick fix was to run this command from MySQL location.

C:\wamp64\bin\mysql\mysql5.7.31\bin\
mysqld --initialize-insecure

Disabling enter key for form

I checked all the above solutions, they don't work. The only possible solution is to catch 'onkeydown' event for each input of the form. You need to attach disableAllInputs to onload of the page or via jquery ready()

/*
 * Prevents default behavior of pushing enter button. This method doesn't work,
 * if bind it to the 'onkeydown' of the document|form, or to the 'onkeypress' of
 * the input. So method should be attached directly to the input 'onkeydown'
 */
function preventEnterKey(e) {
    // W3C (Chrome|FF) || IE
    e = e || window.event;
    var keycode = e.which || e.keyCode;
    if (keycode == 13) { // Key code of enter button
        // Cancel default action
        if (e.preventDefault) { // W3C
            e.preventDefault();
        } else { // IE
            e.returnValue = false;
        }
        // Cancel visible action
        if (e.stopPropagation) { // W3C
            e.stopPropagation();
        } else { // IE
            e.cancelBubble = true;
        }
        // We don't need anything else
        return false;
    }
}
/* Disable enter key for all inputs of the document */
function disableAllInputs() {
    try {
        var els = document.getElementsByTagName('input');
        if (els) {
            for ( var i = 0; i < els.length; i++) {
                els[i].onkeydown = preventEnterKey;
            }
        }
    } catch (e) {
    }
}

When to use window.opener / window.parent / window.top

window.opener refers to the window that called window.open( ... ) to open the window from which it's called
window.parent refers to the parent of a window in a <frame> or <iframe>
window.top refers to the top-most window from a window nested in one or more layers of <iframe> sub-windows

Those will be null (or maybe undefined) when they're not relevant to the referring window's situation. ("Referring window" means the window in whose context the JavaScript code is run.)

Cancel split window in Vim

Just like the others said before the way to do this is to press ctrl+w and then o. This will "maximize" the current window, while closing the others. If you'd like to be able to "unmaximize" it, there's a plugin called ZoomWin for that. Otherwise you'd have to recreate the window setup from scratch.

location.host vs location.hostname and cross-browser compatibility?

Just to add a note that Google Chrome browser has origin attribute for the location. which gives you the entire domain from protocol to the port number as shown in the below screenshot.

When should I use uuid.uuid1() vs. uuid.uuid4() in python?

In addition to the accepted answer, there's a third option that can be useful in some cases:

v1 with random MAC ("v1mc")

You can make a hybrid between v1 & v4 by deliberately generating v1 UUIDs with a random broadcast MAC address (this is allowed by the v1 spec). The resulting v1 UUID is time dependant (like regular v1), but lacks all host-specific information (like v4). It's also much closer to v4 in it's collision-resistance: v1mc = 60 bits of time + 61 random bits = 121 unique bits; v4 = 122 random bits.

First place I encountered this was Postgres' uuid_generate_v1mc() function. I've since used the following python equivalent:

from os import urandom
from uuid import uuid1
_int_from_bytes = int.from_bytes  # py3 only

def uuid1mc():
    # NOTE: The constant here is required by the UUIDv1 spec...
    return uuid1(_int_from_bytes(urandom(6), "big") | 0x010000000000)

(note: I've got a longer + faster version that creates the UUID object directly; can post if anyone wants)

In case of LARGE volumes of calls/second, this has the potential to exhaust system randomness. You could use the stdlib random module instead (it will probably also be faster). But BE WARNED: it only takes a few hundred UUIDs before an attacker can determine the RNG state, and thus partially predict future UUIDs.

import random
from uuid import uuid1

def uuid1mc_insecure():
    return uuid1(random.getrandbits(48) | 0x010000000000)

Maximum Java heap size of a 32-bit JVM on a 64-bit OS

The JROCKIT JVM currently owned by Oracle supports non-contiguous heap usage, thus allowing the 32 bit JVM to access more then 3.8 GB of memory when the JVM is running on a 64 bit windows OS. (2.8 GB when running on a 32 bit OS).

http://blogs.oracle.com/jrockit/entry/how_to_get_almost_3_gb_heap_on_windows

The JVM can be freely downloaded (registration required) at

http://www.oracle.com/technetwork/middleware/jrockit/downloads/index.html

Python Unicode Encode Error

Try adding the following line at the top of your python script.

# _*_ coding:utf-8 _*_

Recursively add the entire folder to a repository

If you want to add a directory and all the files which are located inside it recursively, Go to the directory where the directory you want to add is located.

$ cd directory
$ git add directoryname

How can I add an empty directory to a Git repository?

Sometimes I have repositories with folders that will only ever contain files considered to be "content"—that is, they are not files that I care about being versioned, and therefore should never be committed. With Git's .gitignore file, you can ignore entire directories. But there are times when having the folder in the repo would be beneficial. Here's a excellent solution for accomplishing this need.

What I've done in the past is put a .gitignore file at the root of my repo, and then exclude the folder, like so:

/app/some-folder-to-exclude
/another-folder-to-exclude/*

However, these folders then don't become part of the repo. You could add something like a README file in there. But then you have to tell your application not to worry about processing any README files.

If your app depends on the folders being there (though empty), you can simply add a .gitignore file to the folder in question, and use it to accomplish two goals:

Tell Git there's a file in the folder, which makes Git add it to the repo. Tell Git to ignore the contents of this folder, minus this file itself. Here is the .gitignore file to put inside your empty directories:

*
!.gitignore

The first line (*) tells Git to ignore everything in this directory. The second line tells Git not to ignore the .gitignore file. You can stuff this file into every empty folder you want added to the repository.

With MySQL, how can I generate a column containing the record index in a table?

You may want to try the following:

SELECT  l.position, 
        l.username, 
        l.score,
        @curRow := @curRow + 1 AS row_number
FROM    league_girl l
JOIN    (SELECT @curRow := 0) r;

The JOIN (SELECT @curRow := 0) part allows the variable initialization without requiring a separate SET command.

Test case:

CREATE TABLE league_girl (position int, username varchar(10), score int);
INSERT INTO league_girl VALUES (1, 'a', 10);
INSERT INTO league_girl VALUES (2, 'b', 25);
INSERT INTO league_girl VALUES (3, 'c', 75);
INSERT INTO league_girl VALUES (4, 'd', 25);
INSERT INTO league_girl VALUES (5, 'e', 55);
INSERT INTO league_girl VALUES (6, 'f', 80);
INSERT INTO league_girl VALUES (7, 'g', 15);

Test query:

SELECT  l.position, 
        l.username, 
        l.score,
        @curRow := @curRow + 1 AS row_number
FROM    league_girl l
JOIN    (SELECT @curRow := 0) r
WHERE   l.score > 50;

Result:

+----------+----------+-------+------------+
| position | username | score | row_number |
+----------+----------+-------+------------+
|        3 | c        |    75 |          1 |
|        5 | e        |    55 |          2 |
|        6 | f        |    80 |          3 |
+----------+----------+-------+------------+
3 rows in set (0.00 sec)

Android Get Application's 'Home' Data Directory

To get the path of file in application package;

ContextWrapper c = new ContextWrapper(this);
Toast.makeText(this, c.getFilesDir().getPath(), Toast.LENGTH_LONG).show();

Fastest way to iterate over all the chars in a String

Despite @Saint Hill's answer if you consider the time complexity of str.toCharArray(),

the first one is faster even for very large strings. You can run the code below to see it for yourself.

        char [] ch = new char[1_000_000_00];
    String str = new String(ch); // to create a large string

    // ---> from here
    long currentTime = System.nanoTime();
    for (int i = 0, n = str.length(); i < n; i++) {
        char c = str.charAt(i);
    }
    // ---> to here
    System.out.println("str.charAt(i):"+(System.nanoTime()-currentTime)/1000000.0 +" (ms)");

    /**
     *   ch = str.toCharArray() itself takes lots of time   
     */
    // ---> from here
    currentTime = System.nanoTime();
    ch = str.toCharArray();
    for (int i = 0, n = str.length(); i < n; i++) {
        char c = ch[i];
    }
    // ---> to  here
    System.out.println("ch = str.toCharArray() + c = ch[i] :"+(System.nanoTime()-currentTime)/1000000.0 +" (ms)");

output:

str.charAt(i):5.492102 (ms)
ch = str.toCharArray() + c = ch[i] :79.400064 (ms)

Lumen: get URL parameter in a Blade view

As per official documentation 8.x

We use the helper request

The request function returns the current request instance or obtains an input field's value from the current request:

$request = request();

$value = request('key', $default);

the value of request is an array you can simply retrieve your input using the input key as follow

$id = request()->id; //for http://locahost:8000/example?id=10

iterating over each character of a String in ruby 1.8.6 (each_char)

"ABCDEFG".chars.each do |char|
  puts char
end

also

"ABCDEFG".each_char {|char| p char}

Ruby version >2.5.1

vagrant primary box defined but commands still run against all boxes

The primary flag seems to only work for vagrant ssh for me.

In the past I have used the following method to hack around the issue.

# stage box intended for configuration closely matching production if ARGV[1] == 'stage'     config.vm.define "stage" do |stage|         box_setup stage, \         "10.9.8.31", "deploy/playbook_full_stack.yml", "deploy/hosts/vagrant_stage.yml"     end end

Using lambda expressions for event handlers

Performance-wise it's the same as a named method. The big problem is when you do the following:

MyButton.Click -= (o, i) => 
{ 
    //snip 
}

It will probably try to remove a different lambda, leaving the original one there. So the lesson is that it's fine unless you also want to be able to remove the handler.

How to delete duplicates on a MySQL table?

Deleting duplicate rows in MySQL in-place, (Assuming you have a timestamp col to sort by) walkthrough:

Create the table and insert some rows:

create table penguins(foo int, bar varchar(15), baz datetime);
insert into penguins values(1, 'skipper', now());
insert into penguins values(1, 'skipper', now());
insert into penguins values(3, 'kowalski', now());
insert into penguins values(3, 'kowalski', now());
insert into penguins values(3, 'kowalski', now());
insert into penguins values(4, 'rico', now());
select * from penguins;
    +------+----------+---------------------+
    | foo  | bar      | baz                 |
    +------+----------+---------------------+
    |    1 | skipper  | 2014-08-25 14:21:54 |
    |    1 | skipper  | 2014-08-25 14:21:59 |
    |    3 | kowalski | 2014-08-25 14:22:09 |
    |    3 | kowalski | 2014-08-25 14:22:13 |
    |    3 | kowalski | 2014-08-25 14:22:15 |
    |    4 | rico     | 2014-08-25 14:22:22 |
    +------+----------+---------------------+
6 rows in set (0.00 sec)

Remove the duplicates in place:

delete a
    from penguins a
    left join(
    select max(baz) maxtimestamp, foo, bar
    from penguins
    group by foo, bar) b
    on a.baz = maxtimestamp and
    a.foo = b.foo and
    a.bar = b.bar
    where b.maxtimestamp IS NULL;
Query OK, 3 rows affected (0.01 sec)
select * from penguins;
+------+----------+---------------------+
| foo  | bar      | baz                 |
+------+----------+---------------------+
|    1 | skipper  | 2014-08-25 14:21:59 |
|    3 | kowalski | 2014-08-25 14:22:15 |
|    4 | rico     | 2014-08-25 14:22:22 |
+------+----------+---------------------+
3 rows in set (0.00 sec)

You're done, duplicate rows are removed, last one by timestamp is kept.

For those of you without a timestamp or unique column.

You don't have a timestamp or a unique index column to sort by? You're living in a state of degeneracy. You'll have to do additional steps to delete duplicate rows.

create the penguins table and add some rows

create table penguins(foo int, bar varchar(15)); 
insert into penguins values(1, 'skipper'); 
insert into penguins values(1, 'skipper'); 
insert into penguins values(3, 'kowalski'); 
insert into penguins values(3, 'kowalski'); 
insert into penguins values(3, 'kowalski'); 
insert into penguins values(4, 'rico'); 
select * from penguins; 
    # +------+----------+ 
    # | foo  | bar      | 
    # +------+----------+ 
    # |    1 | skipper  | 
    # |    1 | skipper  | 
    # |    3 | kowalski | 
    # |    3 | kowalski | 
    # |    3 | kowalski | 
    # |    4 | rico     | 
    # +------+----------+

make a clone of the first table and copy into it.

drop table if exists penguins_copy; 
create table penguins_copy as ( SELECT foo, bar FROM penguins );  

#add an autoincrementing primary key: 
ALTER TABLE penguins_copy ADD moo int AUTO_INCREMENT PRIMARY KEY first; 

select * from penguins_copy; 
    # +-----+------+----------+ 
    # | moo | foo  | bar      | 
    # +-----+------+----------+ 
    # |   1 |    1 | skipper  | 
    # |   2 |    1 | skipper  | 
    # |   3 |    3 | kowalski | 
    # |   4 |    3 | kowalski | 
    # |   5 |    3 | kowalski | 
    # |   6 |    4 | rico     | 
    # +-----+------+----------+

The max aggregate operates upon the new moo index:

delete a from penguins_copy a left join( 
    select max(moo) myindex, foo, bar 
    from penguins_copy 
    group by foo, bar) b 
    on a.moo = b.myindex and 
    a.foo = b.foo and 
    a.bar = b.bar 
    where b.myindex IS NULL; 

#drop the extra column on the copied table 
alter table penguins_copy drop moo; 
select * from penguins_copy; 

#drop the first table and put the copy table back: 
drop table penguins; 
create table penguins select * from penguins_copy;

observe and cleanup

drop table penguins_copy; 
select * from penguins;
+------+----------+ 
| foo  | bar      | 
+------+----------+ 
|    1 | skipper  | 
|    3 | kowalski | 
|    4 | rico     | 
+------+----------+ 
    Elapsed: 1458.359 milliseconds

What's that big SQL delete statement doing?

Table penguins with alias 'a' is left joined on a subset of table penguins called alias 'b'. The right hand table 'b' which is a subset finds the max timestamp [ or max moo ] grouped by columns foo and bar. This is matched to left hand table 'a'. (foo,bar,baz) on left has every row in the table. The right hand subset 'b' has a (maxtimestamp,foo,bar) which is matched to left only on the one that IS the max.

Every row that is not that max has value maxtimestamp of NULL. Filter down on those NULL rows and you have a set of all rows grouped by foo and bar that isn't the latest timestamp baz. Delete those ones.

Make a backup of the table before you run this.

Prevent this problem from ever happening again on this table:

If you got this to work, and it put out your "duplicate row" fire. Great. Now define a new composite unique key on your table (on those two columns) to prevent more duplicates from being added in the first place.

Like a good immune system, the bad rows shouldn't even be allowed in to the table at the time of insert. Later on all those programs adding duplicates will broadcast their protest, and when you fix them, this issue never comes up again.

Artisan, creating tables in database

Migration files must match the pattern *_*.php, or else they won't be found. Since users.php does not match this pattern (it has no underscore), this file will not be found by the migrator.

Ideally, you should be creating your migration files using artisan:

php artisan make:migration create_users_table

This will create the file with the appropriate name, which you can then edit to flesh out your migration. The name will also include the timestamp, to help the migrator determine the order of migrations.

You can also use the --create or --table switches to add a little bit more boilerplate to help get you started:

php artisan make:migration create_users_table --create=users

The documentation on migrations can be found here.

jQuery: How to get to a particular child of a parent?

You could use .each() with .children() and a selector within the parenthesis:

//Grab Each Instance of Box.
$(".box").each(function(i){

    //For Each Instance, grab a child called .something1. Fade It Out.
    $(this).children(".something1").fadeOut();
});

Performing Breadth First Search recursively

The dumb way:

template<typename T>
struct Node { Node* left; Node* right; T value; };

template<typename T, typename P>
bool searchNodeDepth(Node<T>* node, Node<T>** result, int depth, P pred) {
    if (!node) return false;
    if (!depth) {
        if (pred(node->value)) {
            *result = node;
        }
        return true;
    }
    --depth;
    searchNodeDepth(node->left, result, depth, pred);
    if (!*result)
        searchNodeDepth(node->right, result, depth, pred);
    return true;
}

template<typename T, typename P>
Node<T>* searchNode(Node<T>* node, P pred) {
    Node<T>* result = NULL;
    int depth = 0;
    while (searchNodeDepth(node, &result, depth, pred) && !result)
        ++depth;
    return result;
}

int main()
{
    // a c   f
    //  b   e
    //    d
    Node<char*>
        a = { NULL, NULL, "A" },
        c = { NULL, NULL, "C" },
        b = { &a, &c, "B" },
        f = { NULL, NULL, "F" },
        e = { NULL, &f, "E" },
        d = { &b, &e, "D" };

    Node<char*>* found = searchNode(&d, [](char* value) -> bool {
        printf("%s\n", value);
        return !strcmp((char*)value, "F");
    });

    printf("found: %s\n", found->value);

    return 0;
}

Height of an HTML select box (dropdown)

This is not a perfect solution but it sort of does work.

In the select tag, include the following attributes where 'n' is the number of dropdown rows that would be visible.

<select size="1" position="absolute" onclick="size=(size!=1)?n:1;" ...>

There are three problems with this solution. 1) There is a quick flash of all the elements shown during the first mouse click. 2) The position is set to 'absolute' 3) Even if there are less than 'n' items the dropdown box will still be for the size of 'n' items.

jQuery checkbox change and click event

Get rid of the change event, and instead change the value of the textbox in the click event. Rather than returning the result of the confirm, catch it in a var. If its true, change the value. Then return the var.

Edit a text file on the console using Powershell

I had to do some debugging on a Windows Nano docker image and needed to edit the content of a file, who would have guessed it was so difficult.

I used a combination of Get-Content and Set-Content and base 64 encoding/decoding to update files. For instance

Editing foo.txt

PS C:\app> Set-Content foo.txt "Hello World"                                                                                                                                                                                        
PS C:\app> Get-Content foo.txt                                                                                                                                                                                                      
Hello World                                                                                                                                                                                                                         
PS C:\app> [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("TXkgbmV3IG11bHRpDQpsaW5lIGRvY3VtZW50DQp3aXRoIGFsbCBraW5kcyBvZiBmdW4gc3R1ZmYNCiFAIyVeJSQmXiYoJiopIUAjIw0KLi4ud29ybGQ=")) | Set-Content foo.txt 
PS C:\app> Get-Content foo.txt                                                                                                                                                                                                      
My new multi                                                                                                                                                                                                                        
line document                                                                                                                                                                                                                       
with all kinds of fun stuff                                                                                                                                                                                                         
!@#%^%$&^&(&*)!@##                                                                                                                                                                                                                  
...world                                                                                                                                                                                                                            
PS C:\app>

The trick is piping the base 64 decoded string to Set-Content

[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("...")) | Set-Content foo.txt

Its no vim but I can update files, for what its worth.

jQuery .scrollTop(); + animation

$("body").stop().animate({
        scrollTop: 0
    }, 500, 'swing', function () {
        console.log(confirm('Like This'))
    }
);

.keyCode vs. .which

look at this: https://developer.mozilla.org/en-US/docs/Web/API/event.keyCode

In a keypress event, the Unicode value of the key pressed is stored in either the keyCode or charCode property, never both. If the key pressed generates a character (e.g. 'a'), charCode is set to the code of that character, respecting the letter case. (i.e. charCode takes into account whether the shift key is held down). Otherwise, the code of the pressed key is stored in keyCode. keyCode is always set in the keydown and keyup events. In these cases, charCode is never set. To get the code of the key regardless of whether it was stored in keyCode or charCode, query the which property. Characters entered through an IME do not register through keyCode or charCode.

Definitive way to trigger keypress events with jQuery

The real answer has to include keyCode:

var e = jQuery.Event("keydown");
e.which = 50; // # Some key code value
e.keyCode = 50
$("input").trigger(e);

Even though jQuery's website says that which and keyCode are normalized they are very badly mistaken. It's always safest to do the standard cross-browser checks for e.which and e.keyCode and in this case just define both.

What does axis in pandas mean?

It specifies the axis along which the means are computed. By default axis=0. This is consistent with the numpy.mean usage when axis is specified explicitly (in numpy.mean, axis==None by default, which computes the mean value over the flattened array) , in which axis=0 along the rows (namely, index in pandas), and axis=1 along the columns. For added clarity, one may choose to specify axis='index' (instead of axis=0) or axis='columns' (instead of axis=1).

+------------+---------+--------+
|            |  A      |  B     |
+------------+---------+---------
|      0     | 0.626386| 1.52325|----axis=1----->
+------------+---------+--------+
             |         |
             | axis=0  |
             ?         ?

Find where java class is loaded from

Here's an example:

package foo;

public class Test
{
    public static void main(String[] args)
    {
        ClassLoader loader = Test.class.getClassLoader();
        System.out.println(loader.getResource("foo/Test.class"));
    }
}

This printed out:

file:/C:/Users/Jon/Test/foo/Test.class

Detect merged cells in VBA Excel with MergeArea

While working with selected cells as shown by @tbur can be useful, it's also not the only option available.

You can use Range() like so:

If Worksheets("Sheet1").Range("A1").MergeCells Then
  Do something
Else
  Do something else
End If

Or:

If Worksheets("Sheet1").Range("A1:C1").MergeCells Then
  Do something
Else
  Do something else
End If

Alternately, you can use Cells():

If Worksheets("Sheet1").Cells(1, 1).MergeCells Then
  Do something
Else
  Do something else
End If

Put request with simple string as request body

Another simple solution is to surround the content variable in your given code with braces like this:

 let content = 'Hello world' 
 axios.put(url, {content}).then(response => {
    resolve(response.data.content)
  }, response => {
    this.handleEditError(response)
  })

Caveat: But this will not send it as string; it will wrap it in a json body that will look like this: {content: "Hello world"}

Convert DataTable to CSV stream

Update 1

I have modified it to use StreamWriter instead, add an option to check if you need column headers in your output.

public static bool DataTableToCSV(DataTable dtSource, StreamWriter writer, bool includeHeader)
{
    if (dtSource == null || writer == null) return false;

    if (includeHeader)
    {
        string[] columnNames = dtSource.Columns.Cast<DataColumn>().Select(column => "\"" + column.ColumnName.Replace("\"", "\"\"") + "\"").ToArray<string>();
        writer.WriteLine(String.Join(",", columnNames));
        writer.Flush();
    }

    foreach (DataRow row in dtSource.Rows)
    {
        string[] fields = row.ItemArray.Select(field => "\"" + field.ToString().Replace("\"", "\"\"") + "\"").ToArray<string>();
        writer.WriteLine(String.Join(",", fields));
        writer.Flush();
    }

    return true;
}

As you can see, you can choose the output by initial StreamWriter, if you use StreamWriter(Stream BaseStream), you can write csv into MemeryStream, FileStream, etc.

Origin

I have an easy datatable to csv function, it serves me well:

    public static void DataTableToCsv(DataTable dt, string csvFile)
    {
        StringBuilder sb = new StringBuilder();

        var columnNames = dt.Columns.Cast<DataColumn>().Select(column => "\"" + column.ColumnName.Replace("\"", "\"\"") + "\"").ToArray();
        sb.AppendLine(string.Join(",", columnNames));

        foreach (DataRow row in dt.Rows)
        {
            var fields = row.ItemArray.Select(field => "\"" + field.ToString().Replace("\"", "\"\"") + "\"").ToArray();
            sb.AppendLine(string.Join(",", fields));
        }

        File.WriteAllText(csvFile, sb.ToString(), Encoding.Default);
    }

How to make a <div> appear in front of regular text/tables

Use the display property in CSS:

<body> 
    <div id="invisible" style="display:none;">Invisible DIV</div>  
    <div>Another DIV 
        <button onclick="document.getElementById('invisible').style.display='block'">
            Button
        </button>  
    </div>  
</body>

When the the display of the first div is set back to block it will appear and shift the second div down.

bootstrap jquery show.bs.modal event won't fire

Make sure you put your on('shown.bs.modal') before instantiating the modal to pop up

$("#myModal").on("shown.bs.modal", function () { 
    alert('Hi');
});
$("#myModal").modal('show'); //This can also be $("#myModal").modal({ show: true });

$("#myModal").on("shown.bs.modal", function () { 
    alert('Hi');
}).modal('show');

To focus on a field, it is better to use the shown.bs.modal in stead of show.bs.modal but maybe for other reasons you want to hide something the the background or set something right before the modal starts showing, use the show.bs.modal function.

What is callback in Android?

You create an interface first, then define a method, which would act as a callback. In this example we would have two classes, one classA and another classB

Interface:

public interface OnCustomEventListener{
  public void onEvent();   //method, which can have parameters
}

the listener itself in classB (we only set the listener in classB)

private OnCustomEventListener mListener; //listener field

//setting the listener
public void setCustomEventListener(OnCustomEventListener eventListener) {
   this.mListener=eventListener;
}

in classA, how we start listening for whatever classB has to tell

classB.setCustomEventListener(new OnCustomEventListener(){
    public void onEvent(){
       //do whatever you want to do when the event is performed.
    }
});

how do we trigger an event from classB (for example on button pressed)

if(this.mListener!=null){
   this.mListener.onEvent();
}

P.S. Your custom listener may have as many parameters as you want

Source

Android: How to set password property in an edit text?

Password.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);

This one works for me.
But you have to look at Octavian Damiean's comment, he's right.

How do I make an input field accept only letters in javaScript?

Use onkeyup on the text box and check the keycode of the key pressed, if its between 65 and 90, allow else empty the text box.

What is the difference between XML and XSD?

Actually the XSD is XML itself. Its purpose is to validate the structure of another XML document. The XSD is not mandatory for any XML, but it assures that the XML could be used for some particular purposes. The XML is only containing data in suitable format and structure.

How to convert string to IP address and vice versa

here's easy-to-use, thread-safe c++ functions to convert uint32_t native-endian to string, and string to native-endian uint32_t:

#include <arpa/inet.h> // inet_ntop & inet_pton
#include <string.h> // strerror_r
#include <arpa/inet.h> // ntohl & htonl
using namespace std; // im lazy

string ipv4_int_to_string(uint32_t in, bool *const success = nullptr)
{
    string ret(INET_ADDRSTRLEN, '\0');
    in = htonl(in);
    const bool _success = (NULL != inet_ntop(AF_INET, &in, &ret[0], ret.size()));
    if (success)
    {
        *success = _success;
    }
    if (_success)
    {
        ret.pop_back(); // remove null-terminator required by inet_ntop
    }
    else if (!success)
    {
        char buf[200] = {0};
        strerror_r(errno, buf, sizeof(buf));
        throw std::runtime_error(string("error converting ipv4 int to string ") + to_string(errno) + string(": ") + string(buf));
    }
    return ret;
}
// return is native-endian
// when an error occurs: if success ptr is given, it's set to false, otherwise a std::runtime_error is thrown.
uint32_t ipv4_string_to_int(const string &in, bool *const success = nullptr)
{
    uint32_t ret;
    const bool _success = (1 == inet_pton(AF_INET, in.c_str(), &ret));
    ret = ntohl(ret);
    if (success)
    {
        *success = _success;
    }
    else if (!_success)
    {
        char buf[200] = {0};
        strerror_r(errno, buf, sizeof(buf));
        throw std::runtime_error(string("error converting ipv4 string to int ") + to_string(errno) + string(": ") + string(buf));
    }
    return ret;
}

fair warning, as of writing, they're un-tested. but these functions are exactly what i was looking for when i came to this thread.

How to check that an object is empty in PHP?

gnuplot : plotting data from multiple input files in a single graph

You may find that gnuplot's for loops are useful in this case, if you adjust your filenames or graph titles appropriately.

e.g.

filenames = "first second third fourth fifth"
plot for [file in filenames] file."dat" using 1:2 with lines

and

filename(n) = sprintf("file_%d", n)
plot for [i=1:10] filename(i) using 1:2 with lines

When do you use POST and when do you use GET?

There is nothing you can't do per-se. The point is that you're not supposed to modify the server state on an HTTP GET. HTTP proxies assume that since HTTP GET does not modify the state then whether a user invokes HTTP GET one time or 1000 times makes no difference. Using this information they assume it is safe to return a cached version of the first HTTP GET. If you break the HTTP specification you risk breaking HTTP client and proxies in the wild. Don't do it :)

What is the best way to connect and use a sqlite database from C#

if you have any problem with the library you can use Microsoft.Data.Sqlite;

 public static DataTable GetData(string connectionString, string query)
        {
            DataTable dt = new DataTable();
            Microsoft.Data.Sqlite.SqliteConnection connection;
            Microsoft.Data.Sqlite.SqliteCommand command;

            connection = new Microsoft.Data.Sqlite.SqliteConnection("Data Source= YOU_PATH_BD.sqlite");
            try
            {
                connection.Open();
                command = new Microsoft.Data.Sqlite.SqliteCommand(query, connection);
                dt.Load(command.ExecuteReader());
                connection.Close();
            }
            catch
            {
            }

            return dt;
        }

you can add NuGet Package Microsoft.Data.Sqlite

Running npm command within Visual Studio Code

Edit user setting file settings.json.
- Settings > Search for settings.json > Edit in settings.json
or
- Run > type %APPDATA%\Code\User\settings.json
Copy this code
{ "terminal.integrated.shell.windows": "C:\\Windows\\System32\\cmd.exe", "terminal.integrated.shellArgs.windows": ["/k nodevars.bat"] }
Restart VS Code

Deprecated Java HttpClient - How hard can it be?

For the original issue, I would request you to apply below logic:

 CloseableHttpClient httpClient = HttpClientBuilder.create().build();
 HttpPost httpPostRequest = new HttpPost();

How to add image to canvas

here is the sample code to draw image on canvas-

$("#selectedImage").change(function(e) {

var URL = window.URL;
var url = URL.createObjectURL(e.target.files[0]);
img.src = url;

img.onload = function() {
    var canvas = document.getElementById("myCanvas");
    var ctx = canvas.getContext("2d");        

    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.drawImage(img, 0, 0, 500, 500);
}});

In the above code selectedImage is an input control which can be used to browse image on system. For more details of sample code to draw image on canvas while maintaining the aspect ratio:

http://newapputil.blogspot.in/2016/09/show-image-on-canvas-html5.html

Java SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'") gives timezone as IST

You haven't set the timezone only added a Z to the end of the date/time, so it will look like a GMT date/time but this doesn't change the value.

Set the timezone to GMT and it will be correct.

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));

How to identify all stored procedures referring a particular table

The query below works only when searching for dependencies on a table and not those on a column:

EXEC sp_depends @objname = N'TableName';

However, the following query is the best option if you want to search for all sorts of dependencies, it does not miss any thing. It actually gives more information than required.

 select distinct
        so.name
        --, text 
  from 
       sysobjects so, 
       syscomments sc 
  where 
     so.id = sc.id 
     and lower(text) like '%organizationtypeid%'
  order by so.name

Android turn On/Off WiFi HotSpot programmatically

We can programmatically turn on and off

setWifiApDisable.invoke(connectivityManager, TETHERING_WIFI);//Have to disable to enable
setwifiApEnabled.invoke(connectivityManager, TETHERING_WIFI, false, mSystemCallback,null);

Using callback class, to programmatically turn on hotspot in pie(9.0) u need to turn off programmatically and the switch on.

jQuery UI " $("#datepicker").datepicker is not a function"

This error usually appears when you're missing a file from the jQuery UI set.

Double-check that you have all the files, the jQuery UI files as well as the CSS and images, and that they're in the correctly linked file/directory location on your server.

How can I ssh directly to a particular directory?

I use the environment variable CDPATH

How to connect to Oracle 11g database remotely

Its quite easy on computer a you don't need to do anything just make sure both system are on same network if its not internet access(for this you need static ip). Okay now on computer b go to start menu find configuration under oracle folder click Net Configuration Assistant under that folder when window pop up click Local net configuration option it must be third option.

Now click add and click next in next screen it will ask service name here you need to add oracle global database name of computer A(Normally I use oracle86 for my installation) now click next next screen choose protocol normally its tcp click next in host name enter computer A's name you can found that in my computer properties. Click next don't change port untill you have changed that in Computer A click next and choose test connection now here you can check your connection working or not if the error is username and password not correct then click login credential button and fill correct username and password. If its saying unable to reach computer ot target not found than you must add exception in firewall for 1521 port or just disable firewall on computer A.

what does "error : a nonstatic member reference must be relative to a specific object" mean?

EncodeAndSend is not a static function, which means it can be called on an instance of the class CPMSifDlg. You cannot write this:

 CPMSifDlg::EncodeAndSend(/*...*/);  //wrong - EncodeAndSend is not static

It should rather be called as:

 CPMSifDlg dlg; //create instance, assuming it has default constructor!
 dlg.EncodeAndSend(/*...*/);   //correct

What is the difference between buffer and cache memory in Linux?

"Buffers" represent how much portion of RAM is dedicated to cache disk blocks. "Cached" is similar like "Buffers", only this time it caches pages from file reading.

quote from:

https://web.archive.org/web/20110207101856/http://www.linuxforums.org/articles/using-top-more-efficiently_89.html

Verify ImageMagick installation

To test only the IMagick PHP extension (not the full ImageMagick suite), save the following as a PHP file (testImagick.php) and then run it from console: php testImagick.php

<?php
$image = new Imagick();
$image->newImage(1, 1, new ImagickPixel('#ffffff'));
$image->setImageFormat('png');
$pngData = $image->getImagesBlob();
echo strpos($pngData, "\x89PNG\r\n\x1a\n") === 0 ? 'Ok' : 'Failed';
echo "\n";

credit: https://mlocati.github.io/articles/php-windows-imagick.html

Lodash .clone and .cloneDeep behaviors

Thanks to Gruff Bunny and Louis' comments, I found the source of the issue.

As I use Backbone.js too, I loaded a special build of Lodash compatible with Backbone and Underscore that disables some features. In this example:

var clone = _.clone(data, true);

data[1].values.d = 'x';

with the Normal build: _.isEqual(data, clone) === false
with the Underscore build: _.isEqual(data, clone) === true

I just replaced the Underscore build with the Normal build in my Backbone application and the application is still working. So I can now use the Lodash .clone with the expected behaviour.

Edit 2018: the Underscore build doesn't seem to exist anymore. If you are reading this in 2018, you could be interested by this documentation (Backbone and Lodash).

How to detect if user select cancel InputBox VBA Excel

The solution above does not work in all InputBox-Cancel cases. Most notably, it does not work if you have to InputBox a Range.

For example, try the following InputBox for defining a custom range ('sRange', type:=8, requires Set + Application.InputBox) and you will get an error upon pressing Cancel:

Sub Cancel_Handler_WRONG()
Set sRange = Application.InputBox("Input custom range", _
    "Cancel-press test", Selection.Address, Type:=8)
If StrPtr(sRange) = 0 Then  'I also tried with sRange.address and vbNullString
    MsgBox ("Cancel pressed!")
    Exit Sub
End If
    MsgBox ("Your custom range is " & sRange.Address)
End Sub

The only thing that works, in this case, is an "On Error GoTo ErrorHandler" statement before the InputBox + ErrorHandler at the end:

Sub Cancel_Handler_OK()
On Error GoTo ErrorHandler
Set sRange = Application.InputBox("Input custom range", _
    "Cancel-press test", Selection.Address, Type:=8)
MsgBox ("Your custom range is " & sRange.Address)
Exit Sub
ErrorHandler:
    MsgBox ("Cancel pressed")
End Sub

So, the question is how to detect either an error or StrPtr()=0 with an If statement?

How can I copy the output of a command directly into my clipboard?

Add this to to your ~/.bashrc:

# Now `cclip' copies and `clipp' pastes'
alias cclip='xclip -selection clipboard'
alias clipp='xclip -selection clipboard -o'

Now clipp pastes and cclip copies — but you can also do fancier stuff:
clipp | sed 's/^/    /' | cclip
↑ indents your clipboard; good for sites without stack overflow's { } button

You can add it by running this:

printf "\nalias clipp=\'xclip -selection c -o\'\n" >> ~/.bashrc
printf "\nalias cclip=\'xclip -selection c -i\'\n" >> ~/.bashrc

How can I check what version/edition of Visual Studio is installed programmatically?

An updated answer to this question would be the following :

"C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property productId

Resolves to 2019

"C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property catalog_productLineVersion

Resolves to Microsoft.VisualStudio.Product.Professional

How do I do a bulk insert in mySQL using node.js

Bulk insert in Node.js can be done using the below code. I have referred lots of blog for getting this work.

please refer this link as well. https://www.technicalkeeda.com/nodejs-tutorials/insert-multiple-records-into-mysql-using-nodejs

The working code.

  const educations = request.body.educations;
  let queryParams = [];
  for (let i = 0; i < educations.length; i++) {
    const education = educations[i];
    const userId = education.user_id;
    const from = education.from;
    const to = education.to;
    const instituteName = education.institute_name;
    const city = education.city;
    const country = education.country;
    const certificateType = education.certificate_type;
    const studyField = education.study_field;
    const duration = education.duration;

    let param = [
      from,
      to,
      instituteName,
      city,
      country,
      certificateType,
      studyField,
      duration,
      userId,
    ];

    queryParams.push(param);
  }

  let sql =
    "insert into tbl_name (education_from, education_to, education_institute_name, education_city, education_country, education_certificate_type, education_study_field, education_duration, user_id) VALUES ?";
  let sqlQuery = dbManager.query(sql, [queryParams], function (
    err,
    results,
    fields
  ) {
    let res;
    if (err) {
      console.log(err);
      res = {
        success: false,
        message: "Insertion failed!",
      };
    } else {
      res = {
        success: true,
        id: results.insertId,
        message: "Successfully inserted",
      };
    }

    response.send(res);
  });

Hope this will help you.

Is there a concurrent List in Java's JDK?

If you never plan to delete elements from the list (since this requires changing the index of all elements after the deleted element), then you can use ConcurrentSkipListMap<Integer, T> in place of ArrayList<T>, e.g.

NavigableMap<Integer, T> map = new ConcurrentSkipListMap<>();

This will allow you to add items to the end of the "list" as follows, as long as there is only one writer thread (otherwise there is a race condition between map.size() and map.put()):

// Add item to end of the "list":
map.put(map.size(), item);

You can also obviously modify the value of any item in the "list" (i.e. the map) by simply calling map.put(index, item).

The average cost for putting items into the map or retrieving them by index is O(log(n)), and ConcurrentSkipListMap is lock-free, which makes it significantly better than say Vector (the old synchronized version of ArrayList).

You can iterate back and forth through the "list" by using the methods of the NavigableMap interface.

You could wrap all the above into a class that implements the List interface, as long as you understand the race condition caveats (or you could synchronize just the writer methods) -- and you would need to throw an unsupported operation exception for the remove methods. There's quite a bit of boilerplate needed to implement all the required methods, but here's a quick attempt at an implementation.

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NavigableMap;
import java.util.Objects;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentSkipListMap;

public class ConcurrentAddOnlyList<V> implements List<V> {
    private NavigableMap<Integer, V> map = new ConcurrentSkipListMap<>();

    @Override
    public int size() {
        return map.size();
    }

    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return map.values().contains(o);
    }

    @Override
    public Iterator<V> iterator() {
        return map.values().iterator();
    }

    @Override
    public Object[] toArray() {
        return map.values().toArray();
    }

    @Override
    public <T> T[] toArray(T[] a) {
        return map.values().toArray(a);
    }

    @Override
    public V get(int index) {
        return map.get(index);
    }

    @Override
    public boolean containsAll(Collection<?> c) {
        return map.values().containsAll(c);
    }

    @Override
    public int indexOf(Object o) {
        for (Entry<Integer, V> ent : map.entrySet()) {
            if (Objects.equals(ent.getValue(), o)) {
                return ent.getKey();
            }
        }
        return -1;
    }

    @Override
    public int lastIndexOf(Object o) {
        for (Entry<Integer, V> ent : map.descendingMap().entrySet()) {
            if (Objects.equals(ent.getValue(), o)) {
                return ent.getKey();
            }
        }
        return -1;
    }

    @Override
    public ListIterator<V> listIterator(int index) {
        return new ListIterator<V>() {
            private int currIdx = 0;

            @Override
            public boolean hasNext() {
                return currIdx < map.size();
            }

            @Override
            public V next() {
                if (currIdx >= map.size()) {
                    throw new IllegalArgumentException(
                            "next() called at end of list");
                }
                return map.get(currIdx++);
            }

            @Override
            public boolean hasPrevious() {
                return currIdx > 0;
            }

            @Override
            public V previous() {
                if (currIdx <= 0) {
                    throw new IllegalArgumentException(
                            "previous() called at beginning of list");
                }
                return map.get(--currIdx);
            }

            @Override
            public int nextIndex() {
                return currIdx + 1;
            }

            @Override
            public int previousIndex() {
                return currIdx - 1;
            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException();
            }

            @Override
            public void set(V e) {
                // Might change size of map if currIdx == map.size(),
                // so need to synchronize 
                synchronized (map) {
                    map.put(currIdx, e);
                }
            }

            @Override
            public void add(V e) {
                synchronized (map) {
                    // Insertion is not supported except at end of list
                    if (currIdx < map.size()) {
                        throw new UnsupportedOperationException();
                    }
                    map.put(currIdx++, e);
                }
            }
        };
    }

    @Override
    public ListIterator<V> listIterator() {
        return listIterator(0);
    }

    @Override
    public List<V> subList(int fromIndex, int toIndex) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean add(V e) {
        synchronized (map) {
            map.put(map.size(), e);
            return true;
        }
    }

    @Override
    public boolean addAll(Collection<? extends V> c) {
        synchronized (map) {
            for (V val : c) {
                add(val);
            }
            return true;
        }
    }

    @Override
    public V set(int index, V element) {
        synchronized (map) {
            if (index < 0 || index > map.size()) {
                throw new IllegalArgumentException("Index out of range");
            }
            return map.put(index, element);
        }
    }

    @Override
    public void clear() {
        synchronized (map) {
            map.clear();
        }
    }

    @Override
    public synchronized void add(int index, V element) {
        synchronized (map) {
            if (index < map.size()) {
                // Insertion is not supported except at end of list
                throw new UnsupportedOperationException();
            } else if (index < 0 || index > map.size()) {
                throw new IllegalArgumentException("Index out of range");
            }
            // index == map.size()
            add(element);
        }
    }

    @Override
    public synchronized boolean addAll(
            int index, Collection<? extends V> c) {
        synchronized (map) {
            if (index < map.size()) {
                // Insertion is not supported except at end of list
                throw new UnsupportedOperationException();
            } else if (index < 0 || index > map.size()) {
                throw new IllegalArgumentException("Index out of range");
            }
            // index == map.size()
            for (V val : c) {
                add(val);
            }
            return true;
        }
    }

    @Override
    public boolean remove(Object o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public V remove(int index) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeAll(Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean retainAll(Collection<?> c) {
        throw new UnsupportedOperationException();
    }
}

Don't forget that even with the writer thread synchronization as shown above, you need to be careful not to run into race conditions that might cause you to drop items, if for example you try to iterate through a list in a reader thread while a writer thread is adding to the end of the list.

You can even use ConcurrentSkipListMap as a double-ended list, as long as you don't need the key of each item to represent the actual position within the list (i.e. adding to the beginning of the list will assign items negative keys). (The same race condition caveat applies here, i.e. there should be only one writer thread.)

// Add item after last item in the "list":
map.put(map.isEmpty() ? 0 : map.lastKey() + 1, item);

// Add item before first item in the "list":
map.put(map.isEmpty() ? 0 : map.firstKey() - 1, item);

what is the use of "response.setContentType("text/html")" in servlet

You have to tell the browser what you are sending back so that the browser can take appropriate action like launching a PDF viewer if its a PDF that is being received or launching a video player to play video file ,rendering the HTML if the content type is simple html response, save the bytes of the response as a downloaded file, etc.

some common MIME types are text/html,application/pdf,video/quicktime,application/java,image/jpeg,application/jar etc

In your case since you are sending HTML response to client you will have to set the content type as text/html

How to show another window from mainwindow in QT

Implement a slot in your QMainWindow where you will open your new Window,
Place a widget on your QMainWindow,
Connect a signal from this widget to a slot from the QMainWindow (for example: if the widget is a QPushButton connect the signal click() to the QMainWindow custom slot you have created).

Code example:

MainWindow.h

// ...
include "newwindow.h"
// ...
public slots:
   void openNewWindow();
// ...
private:
   NewWindow *mMyNewWindow;
// ...
}

MainWindow.cpp

// ...
   MainWindow::MainWindow()
   {
      // ...
      connect(mMyButton, SIGNAL(click()), this, SLOT(openNewWindow()));
      // ...
   }
// ...
void MainWindow::openNewWindow()
{
   mMyNewWindow = new NewWindow(); // Be sure to destroy your window somewhere
   mMyNewWindow->show();
   // ...
}

This is an example on how display a custom new window. There are a lot of ways to do this.

Check if a String contains a special character

This is tested in android 7.0 up to android 10.0 and it works

Use this code to check if string contains special character and numbers:

  name = firstname.getText().toString(); //name is the variable that holds the string value

  Pattern special= Pattern.compile("[^a-z0-9 ]", Pattern.CASE_INSENSITIVE);
  Pattern number = Pattern.compile("[0-9]", Pattern.CASE_INSENSITIVE);
  Matcher matcher = special.matcher(name);
  Matcher matcherNumber = number.matcher(name);

  boolean constainsSymbols = matcher.find();
  boolean containsNumber = matcherNumber.find();

  if(constainsSymbols == true){
   //string contains special symbol/character
  }
  else if(containsNumber == true){
   //string contains numbers
  }
  else{
   //string doesn't contain special characters or numbers
  }

CREATE FILE encountered operating system error 5(failed to retrieve text for this error. Reason: 15105)

Start->Run->services.msc->scroll through the list of services until you find SQL Server->right-click->properties->Log On tab:

Then choose Local System Account and check the Allow service to interact with desktop checkbox.

Restart the service.

Allow scroll but hide scrollbar

I know this is an oldie but here is a quick way to hide the scroll bar with pure CSS.

Just add

::-webkit-scrollbar {display:none;}

To your id or class of the div you're using the scroll bar with.

Here is a helpful link Custom Scroll Bar in Webkit

How to do INSERT into a table records extracted from another table

inserting data form one table to another table in different DATABASE

insert into DocTypeGroup 
    Select DocGrp_Id,DocGrp_SubId,DocGrp_GroupName,DocGrp_PM,DocGrp_DocType 
    from Opendatasource( 'SQLOLEDB','Data Source=10.132.20.19;UserID=sa;Password=gchaturthi').dbIPFMCI.dbo.DocTypeGroup

Sending mail attachment using Java

If you allow me, it works fine also for multi-attachments, the 1st above answer of NINCOMPOOP, with just a little modification like follows:

DataSource source,source2,source3,source4, ...;  
source = new FileDataSource(myfile);  
messageBodyPart.setDataHandler(new DataHandler(source));  
messageBodyPart.setFileName(myfile);  
multipart.addBodyPart(messageBodyPart);  

source2 = new FileDataSource(myfile2);  
messageBodyPart.setDataHandler(new DataHandler(source2));  
messageBodyPart.setFileName(myfile2);  
multipart.addBodyPart(messageBodyPart);  

source3 = new FileDataSource(myfile3);  
messageBodyPart.setDataHandler(new DataHandler(source3));  
messageBodyPart.setFileName(myfile3);  
multipart.addBodyPart(messageBodyPart);  

source4 = new FileDataSource(myfile4);  
messageBodyPart.setDataHandler(new DataHandler(source4));  
messageBodyPart.setFileName(myfile4);  
multipart.addBodyPart(messageBodyPart);  

...

message.setContent(multipart);

How to show google.com in an iframe?

If you are using PHP you can use file_get_contents() to print the content:

<?php
$page = file_get_contents('https://www.google.com');
echo $page;
?>

This will print whatever content file_get_contents() function gets in this url. Please note that since you are displaying content as string instead as a actual web page, things like relative path images are not shown correctly, because /img/myimg.jpg is now loading from your server and not from google.com anymore.

However, you can play with some tricks like str_replace() function to replace absolute urls in images:

<?php
$page = file_get_contents('https://www.google.com');
echo str_replace('src="img/','src="https://google.com/img/',$page);
?>

How to get values and keys from HashMap?

Use the 'string' key of the hashmap, to access its value which is your tab class.

Tab mytab = hash.get("your_string_key_used_to_insert");

MySQL: Delete all rows older than 10 minutes

If time_created is a unix timestamp (int), you should be able to use something like this:

DELETE FROM locks WHERE time_created < (UNIX_TIMESTAMP() - 600);

(600 seconds = 10 minutes - obviously)

Otherwise (if time_created is mysql timestamp), you could try this:

DELETE FROM locks WHERE time_created < (NOW() - INTERVAL 10 MINUTE)

How can I disable an <option> in a <select> based on its value in JavaScript?

var vals = new Array( 2, 3, 5, 8 );
select_disable_options('add_reklamaciq_reason',vals);
select_disable_options('add_reklamaciq_reason');

function select_disable_options(selectid,vals){
  var selected = false ;
  $('#'+selectid+' option').removeAttr('selected');
  $('#'+selectid+' option').each(function(i,elem){
       var elid = parseInt($(elem).attr('value'));
       if(vals){
           if(vals.indexOf(elid) != -1){
               $(elem).removeAttr('disabled');
               if(selected == false){
                   $(elem).attr('selected','selected');
                   selected = true ; 
               }
           }else{
               $(elem).attr('disabled','disabled'); 
           }
       }else{
            $(elem).removeAttr('disabled');
       }
  });   
}

Here with JQ .. if anybody search it

Run JavaScript in Visual Studio Code

For windows: just change file association of .js file to node.exe

1) Take VSCode
2) Right click on the file in left pane
3) Click "Reveal in explorer" from context menu
4) Right click on the file -> Select "Open with" -> Select "Choose another program"
5) Check box "Always use this app to open .js file"
6) Click "More apps" -> "Look for another app in PC"
7) Navigate to node.js installation directory.(Default C:\Program Files\nodejs\node.exe"
8) Click "Open" and you can just see cmd flashing
9) Restart vscode and open the file -> Terminal Menu -> "Run active file".

Excel VBA - Delete empty rows

How about

sub foo()
  dim r As Range, rows As Long, i As Long
  Set r = ActiveSheet.Range("A1:Z50")
  rows = r.rows.Count
  For i = rows To 1 Step (-1)
    If WorksheetFunction.CountA(r.rows(i)) = 0 Then r.rows(i).Delete
  Next
End Sub

Try this

Option Explicit

Sub Sample()
    Dim i As Long
    Dim DelRange As Range

    On Error GoTo Whoa

    Application.ScreenUpdating = False

    For i = 1 To 50
        If Application.WorksheetFunction.CountA(Range("A" & i & ":" & "Z" & i)) = 0 Then
            If DelRange Is Nothing Then
                Set DelRange = Range("A" & i & ":" & "Z" & i)
            Else
                Set DelRange = Union(DelRange, Range("A" & i & ":" & "Z" & i))
            End If
        End If
    Next i

    If Not DelRange Is Nothing Then DelRange.Delete shift:=xlUp
LetsContinue:
    Application.ScreenUpdating = True

    Exit Sub
Whoa:
    MsgBox Err.Description
    Resume LetsContinue
End Sub

IF you want to delete the entire row then use this code

Option Explicit

Sub Sample()
    Dim i As Long
    Dim DelRange As Range

    On Error GoTo Whoa

    Application.ScreenUpdating = False

    For i = 1 To 50
        If Application.WorksheetFunction.CountA(Range("A" & i & ":" & "Z" & i)) = 0 Then
            If DelRange Is Nothing Then
                Set DelRange = Rows(i)
            Else
                Set DelRange = Union(DelRange, Rows(i))
            End If
        End If
    Next i

    If Not DelRange Is Nothing Then DelRange.Delete shift:=xlUp
LetsContinue:
    Application.ScreenUpdating = True

    Exit Sub
Whoa:
    MsgBox Err.Description
    Resume LetsContinue
End Sub

Is there a way to detect if an image is blurry?

I tried solution based on Laplacian filter from this post. It didn't help me. So, I tried the solution from this post and it was good for my case (but is slow):

import cv2

image = cv2.imread("test.jpeg")
height, width = image.shape[:2]
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

def px(x, y):
    return int(gray[y, x])

sum = 0
for x in range(width-1):
    for y in range(height):
        sum += abs(px(x, y) - px(x+1, y))

Less blurred image has maximum sum value!

You can also tune speed and accuracy by changing step, e.g.

this part

for x in range(width - 1):

you can replace with this one

for x in range(0, width - 1, 10):

Validate that end date is greater than start date with jQuery

Reference jquery.validate.js and jquery-1.2.6.js. Add a startDate class to your start date textbox. Add an endDate class to your end date textbox.

Add this script block to your page:-

<script type="text/javascript">
    $(document).ready(function() {
        $.validator.addMethod("endDate", function(value, element) {
            var startDate = $('.startDate').val();
            return Date.parse(startDate) <= Date.parse(value) || value == "";
        }, "* End date must be after start date");
        $('#formId').validate();
    });
</script>

Hope this helps :-)

JavaScript query string

Building on the answer by @CMS I have the following (in CoffeeScript which can easily be converted to JavaScript):

String::to_query = ->
  [result, re, d] = [{}, /([^&=]+)=([^&]*)/g, decodeURIComponent]
  while match = re.exec(if @.match /^\?/ then @.substring(1) else @)
    result[d(match[1])] = d match[2] 
  result

You can easily grab what you need with:

location.search.to_query()['my_param']

The win here is an object-oriented interface (instead of functional) and it can be done on any string (not just location.search).

If you are already using a JavaScript library this function make already exist. For example here is Prototype's version

How to add noise (Gaussian/salt and pepper etc) to image in Python with OpenCV

just look at cv2.randu() or cv.randn(), it's all pretty similar to matlab already, i guess.

let's play a bit ;) :

import cv2
import numpy as np

>>> im = np.empty((5,5), np.uint8) # needs preallocated input image
>>> im
array([[248, 168,  58,   2,   1],  # uninitialized memory counts as random, too ?  fun ;) 
       [  0, 100,   2,   0, 101],
       [  0,   0, 106,   2,   0],
       [131,   2,   0,  90,   3],
       [  0, 100,   1,   0,  83]], dtype=uint8)
>>> im = np.zeros((5,5), np.uint8) # seriously now.
>>> im
array([[0, 0, 0, 0, 0],
       [0, 0, 0, 0, 0],
       [0, 0, 0, 0, 0],
       [0, 0, 0, 0, 0],
       [0, 0, 0, 0, 0]], dtype=uint8)
>>> cv2.randn(im,(0),(99))         # normal
array([[  0,  76,   0, 129,   0],
       [  0,   0,   0, 188,  27],
       [  0, 152,   0,   0,   0],
       [  0,   0, 134,  79,   0],
       [  0, 181,  36, 128,   0]], dtype=uint8)
>>> cv2.randu(im,(0),(99))         # uniform
array([[19, 53,  2, 86, 82],
       [86, 73, 40, 64, 78],
       [34, 20, 62, 80,  7],
       [24, 92, 37, 60, 72],
       [40, 12, 27, 33, 18]], dtype=uint8)

to apply it to an existing image, just generate noise in the desired range, and add it:

img = ...
noise = ...

image = img + noise

Get total size of file in bytes

You don't need FileInputStream to calculate file size, new File(path_to_file).length() is enough. Or, if you insist, use fileinputstream.getChannel().size().

CSS Auto hide elements after 5 seconds

Why not try fadeOut?

_x000D_

$(document).ready(function() {_x000D_
  $('#plsme').fadeOut(5000); // 5 seconds x 1000 milisec = 5000 milisec_x000D_
});

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>_x000D_
<div id='plsme'>Loading... Please Wait</div>

_x000D_

fadeOut (Javascript Pure):

How to make fadeOut effect with pure JavaScript

Click events on Pie Charts in Chart.js

To successfully track click events and on what graph element the user clicked, I did the following in my .js file I set up the following variables:

vm.chartOptions = {
    onClick: function(event, array) {
        let element = this.getElementAtEvent(event);
        if (element.length > 0) {
            var series= element[0]._model.datasetLabel;
            var label = element[0]._model.label;
            var value = this.data.datasets[element[0]._datasetIndex].data[element[0]._index];
        }
    }
};
vm.graphSeries = ["Series 1", "Serries 2"];
vm.chartLabels = ["07:00", "08:00", "09:00", "10:00"];
vm.chartData = [ [ 20, 30, 25, 15 ], [ 5, 10, 100, 20 ] ];

Then in my .html file I setup the graph as follows:

<canvas id="releaseByHourBar" 
    class="chart chart-bar"
    chart-data="vm.graphData"
    chart-labels="vm.graphLabels" 
    chart-series="vm.graphSeries"
    chart-options="vm.chartOptions">
</canvas>

How do I solve the INSTALL_FAILED_DEXOPT error?

In my case problem was happening on some devices running API 21 and 22. Setting android:vmSafeMode="true" in manifest under application tag resolved the issue. However, it is not recommended for release builds, so I created two xml files in values folder. The default one for older API's:

<resources>
    <bool name="vm_safe_mode">true</bool>
</resources>

And the same for API's >= 23 with false value. In that case devices with newer OS won't be affected and the old ones will at least work.

java.sql.SQLException: - ORA-01000: maximum open cursors exceeded

I faced the same problem (ORA-01000) today. I had a for loop in the try{}, to execute a SELECT statement in an Oracle DB many times, (each time changing a parameter), and in the finally{} I had my code to close Resultset, PreparedStatement and Connection as usual. But as soon as I reached a specific amount of loops (1000) I got the Oracle error about too many open cursors.

Based on the post by Andrew Alcock above, I made changes so that inside the loop, I closed each resultset and each statement after getting the data and before looping again, and that solved the problem.

Additionaly, the exact same problem occured in another loop of Insert Statements, in another Oracle DB (ORA-01000), this time after 300 statements. Again it was solved in the same way, so either the PreparedStatement or the ResultSet or both, count as open cursors until they are closed.

What does the JSLint error 'body of a for in should be wrapped in an if statement' mean?

Bad: (jsHint will throw a error)

for (var name in item) {
    console.log(item[name]);
}

Good:

for (var name in item) {
  if (item.hasOwnProperty(name)) {
    console.log(item[name]);
  }
}

How do I force Kubernetes to re-pull an image?

# Linux

kubectl patch deployment <name> -p "{\"spec\":{\"template\":{\"metadata\":{\"annotations\":{\"date\":\"`date +'%s'`\"}}}}}"

# windows

kubectl patch deployment <name> -p (-join("{\""spec\"":{\""template\"":{\""metadata\"":{\""annotations\"":{\""date\"":\""" , $(Get-Date -Format o).replace(':','-').replace('+','_') , "\""}}}}}"))

<code> vs <pre> vs <samp> for inline and block code snippets

Consider Prism.js: https://prismjs.com/#examples

It makes <pre><code> work and is attractive.

Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;

I converted a non-library project to a library project, but it had a previously built jar file in the libs folder. Removing this jar file caused this error to go away.

Time complexity of accessing a Python dict

See Time Complexity. The python dict is a hashmap, its worst case is therefore O(n) if the hash function is bad and results in a lot of collisions. However that is a very rare case where every item added has the same hash and so is added to the same chain which for a major Python implementation would be extremely unlikely. The average time complexity is of course O(1).

The best method would be to check and take a look at the hashs of the objects you are using. The CPython Dict uses int PyObject_Hash (PyObject *o) which is the equivalent of hash(o).

After a quick check, I have not yet managed to find two tuples that hash to the same value, which would indicate that the lookup is O(1)

l = []
for x in range(0, 50):
    for y in range(0, 50):
        if hash((x,y)) in l:
            print "Fail: ", (x,y)
        l.append(hash((x,y)))
print "Test Finished"

CodePad (Available for 24 hours)

What does "TypeError 'xxx' object is not callable" means?

The action occurs when you attempt to call an object which is not a function, as with (). For instance, this will produce the error:

>>> a = 5
>>> a()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable

Class instances can also be called if they define a method __call__

One common mistake that causes this error is trying to look up a list or dictionary element, but using parentheses instead of square brackets, i.e. (0) instead of [0]

How to use sbt from behind proxy?

If you are using a Proxy which requires authentication, I have a solution for you :)

As @Faiz explained above, SBT has a very hard time handling proxy requiring authentication. The solution is to bypass this authentication, if you cannot turn off your proxy on demand (corporate proxy for example). To do so, I suggest you use a squid proxy, and configure it with your username and password to access your corporate proxy. See : https://doc.ubuntu-fr.org/squid Then, you can set JAVA_OPTS or SBT_OPTS environment variables so that SBT connects to your own local squid proxy instead of your corporate proxy :

export JAVA_OPTS = "-Dhttps.proxyHost=localhost -Dhttps.proxyPort=3128 -Dhttp.proxyHost=localhost -Dhttp.proxyPort=3128"

(just c/c this in your bashrc without modifying anything and it should work fine).

The trick is that Squid Proxy does not require any authentication, and acts as an intermediate between SBT and your other proxy.

If you have troubles in applying this advise, please let me know.

Regards,

Edgar

How to remove specific elements in a numpy array

To delete by value :

modified_array = np.delete(original_array, np.where(original_array == value_to_delete))

Safari 3rd party cookie iframe trick no longer working?

I had the same problem and today I found a fix that works fine for me. If the user agent contains Safari and no cookies are set, I redirect the user to the OAuth Dialog:

<?php if ( ! count($_COOKIE) > 0 && strpos($_SERVER['HTTP_USER_AGENT'], 'Safari')) { ?>
<script type="text/javascript">
    window.top.location.href = 'https://www.facebook.com/dialog/oauth/?client_id=APP_ID&redirect_uri=MY_TAB_URL&scope=SCOPE';
</script>
<?php } ?>

After authentication and asking for permissions the OAuth Dialog will redirect to my URI in the top location. So setting cookies is possible. For all of our canvas and page tab apps I have already included the following script:

<script type="text/javascript">
    if (top.location.href==location.href) top.location.href = 'MY_TAB_URL';
</script>

So the user will be redirected again to the Facebook page tab with a valid cookie already set and the signed request is posted again.

Timing Delays in VBA

Have you tried to use Sleep?

There's an example HERE (copied below):

Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)

Private Sub Form_Activate()    

frmSplash.Show
DoEvents
Sleep 1000
Unload Me
frmProfiles.Show

End Sub

Notice it might freeze the application for the chosen amount of time.

Concatenate two NumPy arrays vertically

a = np.array([1,2,3])
b = np.array([4,5,6])
np.array((a,b))

works just as well as

np.array([[1,2,3], [4,5,6]])

Regardless of whether it is a list of lists or a list of 1d arrays, np.array tries to create a 2d array.

But it's also a good idea to understand how np.concatenate and its family of stack functions work. In this context concatenate needs a list of 2d arrays (or any anything that np.array will turn into a 2d array) as inputs.

np.vstack first loops though the inputs making sure they are at least 2d, then does concatenate. Functionally it's the same as expanding the dimensions of the arrays yourself.

np.stack is a new function that joins the arrays on a new dimension. Default behaves just like np.array.

Look at the code for these functions. If written in Python you can learn quite a bit. For vstack:

return _nx.concatenate([atleast_2d(_m) for _m in tup], 0)

How to speed up insertion performance in PostgreSQL

For optimal Insertion performance disable the index if that's an option for you. Other than that, better hardware (disk, memory) is also helpful

How do I create JavaScript array (JSON format) dynamically?

var accounting = [];
var employees = {};

for(var i in someData) {

    var item = someData[i];

   accounting.push({ 
        "firstName" : item.firstName,
        "lastName"  : item.lastName,
        "age"       : item.age 
    });
}

employees.accounting = accounting;

How to automatically import data from uploaded CSV or XLS file into Google Sheets

You can programmatically import data from a csv file in your Drive into an existing Google Sheet using Google Apps Script, replacing/appending data as needed.

Below is some sample code. It assumes that: a) you have a designated folder in your Drive where the CSV file is saved/uploaded to; b) the CSV file is named "report.csv" and the data in it comma-delimited; and c) the CSV data is imported into a designated spreadsheet. See comments in code for further details.

function importData() {
  var fSource = DriveApp.getFolderById(reports_folder_id); // reports_folder_id = id of folder where csv reports are saved
  var fi = fSource.getFilesByName('report.csv'); // latest report file
  var ss = SpreadsheetApp.openById(data_sheet_id); // data_sheet_id = id of spreadsheet that holds the data to be updated with new report data

  if ( fi.hasNext() ) { // proceed if "report.csv" file exists in the reports folder
    var file = fi.next();
    var csv = file.getBlob().getDataAsString();
    var csvData = CSVToArray(csv); // see below for CSVToArray function
    var newsheet = ss.insertSheet('NEWDATA'); // create a 'NEWDATA' sheet to store imported data
    // loop through csv data array and insert (append) as rows into 'NEWDATA' sheet
    for ( var i=0, lenCsv=csvData.length; i<lenCsv; i++ ) {
      newsheet.getRange(i+1, 1, 1, csvData[i].length).setValues(new Array(csvData[i]));
    }
    /*
    ** report data is now in 'NEWDATA' sheet in the spreadsheet - process it as needed,
    ** then delete 'NEWDATA' sheet using ss.deleteSheet(newsheet)
    */
    // rename the report.csv file so it is not processed on next scheduled run
    file.setName("report-"+(new Date().toString())+".csv");
  }
};


// http://www.bennadel.com/blog/1504-Ask-Ben-Parsing-CSV-Strings-With-Javascript-Exec-Regular-Expression-Command.htm
// This will parse a delimited string into an array of
// arrays. The default delimiter is the comma, but this
// can be overriden in the second argument.

function CSVToArray( strData, strDelimiter ) {
  // Check to see if the delimiter is defined. If not,
  // then default to COMMA.
  strDelimiter = (strDelimiter || ",");

  // Create a regular expression to parse the CSV values.
  var objPattern = new RegExp(
    (
      // Delimiters.
      "(\\" + strDelimiter + "|\\r?\\n|\\r|^)" +

      // Quoted fields.
      "(?:\"([^\"]*(?:\"\"[^\"]*)*)\"|" +

      // Standard fields.
      "([^\"\\" + strDelimiter + "\\r\\n]*))"
    ),
    "gi"
  );

  // Create an array to hold our data. Give the array
  // a default empty first row.
  var arrData = [[]];

  // Create an array to hold our individual pattern
  // matching groups.
  var arrMatches = null;

  // Keep looping over the regular expression matches
  // until we can no longer find a match.
  while (arrMatches = objPattern.exec( strData )){

    // Get the delimiter that was found.
    var strMatchedDelimiter = arrMatches[ 1 ];

    // Check to see if the given delimiter has a length
    // (is not the start of string) and if it matches
    // field delimiter. If id does not, then we know
    // that this delimiter is a row delimiter.
    if (
      strMatchedDelimiter.length &&
      (strMatchedDelimiter != strDelimiter)
    ){

      // Since we have reached a new row of data,
      // add an empty row to our data array.
      arrData.push( [] );

    }

    // Now that we have our delimiter out of the way,
    // let's check to see which kind of value we
    // captured (quoted or unquoted).
    if (arrMatches[ 2 ]){

      // We found a quoted value. When we capture
      // this value, unescape any double quotes.
      var strMatchedValue = arrMatches[ 2 ].replace(
        new RegExp( "\"\"", "g" ),
        "\""
      );

    } else {

      // We found a non-quoted value.
      var strMatchedValue = arrMatches[ 3 ];

    }

    // Now that we have our value string, let's add
    // it to the data array.
    arrData[ arrData.length - 1 ].push( strMatchedValue );
  }

  // Return the parsed data.
  return( arrData );
};

You can then create time-driven trigger in your script project to run importData() function on a regular basis (e.g. every night at 1AM), so all you have to do is put new report.csv file into the designated Drive folder, and it will be automatically processed on next scheduled run.

If you absolutely MUST work with Excel files instead of CSV, then you can use this code below. For it to work you must enable Drive API in Advanced Google Services in your script and in Developers Console (see How to Enable Advanced Services for details).

/**
 * Convert Excel file to Sheets
 * @param {Blob} excelFile The Excel file blob data; Required
 * @param {String} filename File name on uploading drive; Required
 * @param {Array} arrParents Array of folder ids to put converted file in; Optional, will default to Drive root folder
 * @return {Spreadsheet} Converted Google Spreadsheet instance
 **/
function convertExcel2Sheets(excelFile, filename, arrParents) {

  var parents  = arrParents || []; // check if optional arrParents argument was provided, default to empty array if not
  if ( !parents.isArray ) parents = []; // make sure parents is an array, reset to empty array if not

  // Parameters for Drive API Simple Upload request (see https://developers.google.com/drive/web/manage-uploads#simple)
  var uploadParams = {
    method:'post',
    contentType: 'application/vnd.ms-excel', // works for both .xls and .xlsx files
    contentLength: excelFile.getBytes().length,
    headers: {'Authorization': 'Bearer ' + ScriptApp.getOAuthToken()},
    payload: excelFile.getBytes()
  };

  // Upload file to Drive root folder and convert to Sheets
  var uploadResponse = UrlFetchApp.fetch('https://www.googleapis.com/upload/drive/v2/files/?uploadType=media&convert=true', uploadParams);

  // Parse upload&convert response data (need this to be able to get id of converted sheet)
  var fileDataResponse = JSON.parse(uploadResponse.getContentText());

  // Create payload (body) data for updating converted file's name and parent folder(s)
  var payloadData = {
    title: filename, 
    parents: []
  };
  if ( parents.length ) { // Add provided parent folder(s) id(s) to payloadData, if any
    for ( var i=0; i<parents.length; i++ ) {
      try {
        var folder = DriveApp.getFolderById(parents[i]); // check that this folder id exists in drive and user can write to it
        payloadData.parents.push({id: parents[i]});
      }
      catch(e){} // fail silently if no such folder id exists in Drive
    }
  }
  // Parameters for Drive API File Update request (see https://developers.google.com/drive/v2/reference/files/update)
  var updateParams = {
    method:'put',
    headers: {'Authorization': 'Bearer ' + ScriptApp.getOAuthToken()},
    contentType: 'application/json',
    payload: JSON.stringify(payloadData)
  };

  // Update metadata (filename and parent folder(s)) of converted sheet
  UrlFetchApp.fetch('https://www.googleapis.com/drive/v2/files/'+fileDataResponse.id, updateParams);

  return SpreadsheetApp.openById(fileDataResponse.id);
}

/**
 * Sample use of convertExcel2Sheets() for testing
 **/
 function testConvertExcel2Sheets() {
  var xlsId = "0B9**************OFE"; // ID of Excel file to convert
  var xlsFile = DriveApp.getFileById(xlsId); // File instance of Excel file
  var xlsBlob = xlsFile.getBlob(); // Blob source of Excel file for conversion
  var xlsFilename = xlsFile.getName(); // File name to give to converted file; defaults to same as source file
  var destFolders = []; // array of IDs of Drive folders to put converted file in; empty array = root folder
  var ss = convertExcel2Sheets(xlsBlob, xlsFilename, destFolders);
  Logger.log(ss.getId());
}

The above code is also available as a gist here.

How to style a div to have a background color for the entire width of the content, and not just for the width of the display?

black magic:

<style>
body { float:left;}
.success { background-color: #ccffcc;}
</style>

If anyone has a clear explanation of why this works, please comment. I think it has something to do with a side effect of the float that removes the constraint that the body must fit into the page width.

How do I replace all the spaces with %20 in C#?

HttpUtility.UrlEncode Method (String)

Multiple commands in an alias for bash

Add this function to your ~/.bashrc and restart your terminal or run source ~/.bashrc

function lock() {
    gnome-screensaver
    gnome-screensaver-command --lock
}

This way these two commands will run whenever you enter lock in your terminal.

In your specific case creating an alias may work, but I don't recommend it. Intuitively we would think the value of an alias would run the same as if you entered the value in the terminal. However that's not the case:

The rules concerning the definition and use of aliases are somewhat confusing.

and

For almost every purpose, shell functions are preferred over aliases.

So don't use an alias unless you have to. https://ss64.com/bash/alias.html

How to convert int to float in C?

Integer division truncates, so (50/100) results in 0. You can cast to float (better double) or multiply with 100.0 (for double precision, 100.0f for float precision) first,

double percentage;
// ...
percentage = 100.0*number/total;
// percentage = (double)number/total * 100;

float percentage;
// ...
percentage = (float)number/total * 100;
// percentage = 100.0f*number/total;

Since floating point arithmetic is not associative, the results of 100.0*number/total and (double)number/total * 100 may be slightly different (the same holds for float), but it's extremely unlikely to influence the first two places after the decimal point, so it probably doesn't matter which way you choose.

How to use 'cp' command to exclude a specific directory?

cp -r ls -A | grep -v "Excluded_File_or_folder" ../$target_location -v

How to check edittext's text is email address or not?

In your case you can use the android.util.Patterns package.

EditText email = (EditText)findViewById(R.id.user_email);

if(Patterns.EMAIL_ADDRESS.matcher(email.getText().toString()).matches())
    Toast.makeText(this, "Email is VALID.", Toast.LENGTH_SHORT).show();
else
    Toast.makeText(this, "Email is INVALID.", Toast.LENGTH_SHORT).show();

Copying PostgreSQL database to another server

pg_dump the_db_name > the_backup.sql

Then copy the backup to your development server, restore with:

psql the_new_dev_db < the_backup.sql

How to center absolute div horizontally using CSS?

so easy, only use margin and left, right properties:

.elements {
 position: absolute;
 margin-left: auto;
 margin-right: auto;
 left: 0;
 right: 0;
}

You can see more in this tip => How to set div element to center in html- Obinb blog

How do I find a list of Homebrew's installable packages?

Please use Homebrew Formulae page to see the list of installable packages. https://formulae.brew.sh/formula/

To install any package => command to use is :

brew install node

JavaScript - XMLHttpRequest, Access-Control-Allow-Origin errors

I've gotten same problem. The servers logs showed:

DEBUG: <-- origin: null

I've investigated that and it occurred that this is not populated when I've been calling from file from local drive. When I've copied file to the server and used it from server - the request worked perfectly fine

How to switch Python versions in Terminal?

Here is a nice and simple way to do it (but on CENTOS), without braking the operating system.

yum install scl-utils

yum install centos-release-scl-rh

And lastly you install the version that you want, lets say python3.5

yum install rh-python35

And lastly:

scl enable rh-python35 bash

Since MAC-OS is a unix operating system, the way to do it it should be quite similar.

CMake not able to find OpenSSL library

Please install openssl from below link:
https://code.google.com/p/openssl-for-windows/downloads/list
then set the variables below:

OPENSSL_ROOT_DIR=D:/softwares/visualStudio/openssl-0.9.8k_WIN32
OPENSSL_INCLUDE_DIR=D:/softwares/visualStudio/openssl-0.9.8k_WIN32/include
OPENSSL_LIBRARIES=D:/softwares/visualStudio/openssl-0.9.8k_WIN32/lib

C# catch a stack overflow exception

You can't as most of the posts are explaining, let me add another area:

On many websites you will find people saying that the way to avoid this is using a different AppDomain so if this happens the domain will be unloaded. That is absolutely wrong (unless you host your CLR) as the default behavior of the CLR will raise a KillProcess event, bringing down your default AppDomain.

Read input stream twice

You can wrap input stream with PushbackInputStream. PushbackInputStream allows to unread ("write back") bytes which were already read, so you can do like this:

public class StreamTest {
  public static void main(String[] args) throws IOException {
    byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

    InputStream originalStream = new ByteArrayInputStream(bytes);

    byte[] readBytes = getBytes(originalStream, 3);
    printBytes(readBytes); // prints: 1 2 3

    readBytes = getBytes(originalStream, 3);
    printBytes(readBytes); // prints: 4 5 6

    // now let's wrap it with PushBackInputStream

    originalStream = new ByteArrayInputStream(bytes);

    InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 characters can be "written back" to the stream

    readBytes = getBytes(wrappedStream, 3);
    printBytes(readBytes); // prints 1 2 3

    ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length);

    readBytes = getBytes(wrappedStream, 3);
    printBytes(readBytes); // prints 1 2 3


  }

  private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException {
    System.out.print("Reading stream: ");

    byte[] buf = new byte[howManyBytes];

    int next = 0;
    for (int i = 0; i < howManyBytes; i++) {
      next = is.read();
      if (next > 0) {
        buf[i] = (byte) next;
      }
    }
    return buf;
  }

  private static void printBytes(byte[] buffer) throws IOException {
    System.out.print("Reading stream: ");

    for (int i = 0; i < buffer.length; i++) {
      System.out.print(buffer[i] + " ");
    }
    System.out.println();
  }


}

Please note that PushbackInputStream stores internal buffer of bytes so it really creates a buffer in memory which holds bytes "written back".

Knowing this approach we can go further and combine it with FilterInputStream. FilterInputStream stores original input stream as a delegate. This allows to create new class definition which allows to "unread" original data automatically. The definition of this class is following:

public class TryReadInputStream extends FilterInputStream {
  private final int maxPushbackBufferSize;

  /**
  * Creates a <code>FilterInputStream</code>
  * by assigning the  argument <code>in</code>
  * to the field <code>this.in</code> so as
  * to remember it for later use.
  *
  * @param in the underlying input stream, or <code>null</code> if
  *           this instance is to be created without an underlying stream.
  */
  public TryReadInputStream(InputStream in, int maxPushbackBufferSize) {
    super(new PushbackInputStream(in, maxPushbackBufferSize));
    this.maxPushbackBufferSize = maxPushbackBufferSize;
  }

  /**
   * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes are still avilable
   * in the stream
   *
   * @param buffer the destination buffer to which read the data
   * @param offset  the start offset in the destination <code>buffer</code>
   * @aram length how many bytes to read from the stream to buff. Length needs to be less than
   *        <code>maxPushbackBufferSize</code> or IOException will be thrown
   *
   * @return number of bytes read
   * @throws java.io.IOException in case length is
   */
  public int tryRead(byte[] buffer, int offset, int length) throws IOException {
    validateMaxLength(length);

    // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);"
    // because read() guarantees to read a byte

    int bytesRead = 0;

    int nextByte = 0;

    for (int i = 0; (i < length) && (nextByte >= 0); i++) {
      nextByte = read();
      if (nextByte >= 0) {
        buffer[offset + bytesRead++] = (byte) nextByte;
      }
    }

    if (bytesRead > 0) {
      ((PushbackInputStream) in).unread(buffer, offset, bytesRead);
    }

    return bytesRead;

  }

  public byte[] tryRead(int maxBytesToRead) throws IOException {
    validateMaxLength(maxBytesToRead);

    ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes array instead of allocating possibly large buffer (if maxBytesToRead is large)

    // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);"
    // because read() guarantees to read a byte

    int nextByte = 0;

    for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) {
      nextByte = read();
      if (nextByte >= 0) {
        baos.write((byte) nextByte);
      }
    }

    byte[] buffer = baos.toByteArray();

    if (buffer.length > 0) {
      ((PushbackInputStream) in).unread(buffer, 0, buffer.length);
    }

    return buffer;

  }

  private void validateMaxLength(int length) throws IOException {
    if (length > maxPushbackBufferSize) {
      throw new IOException(
        "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " +
        length);
    }
  }

}

This class has two methods. One for reading into existing buffer (defintion is analogous to calling public int read(byte b[], int off, int len) of InputStream class). Second which returns new buffer (this may be more effective if the size of buffer to read is unknown).

Now let's see our class in action:

public class StreamTest2 {
  public static void main(String[] args) throws IOException {
    byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

    InputStream originalStream = new ByteArrayInputStream(bytes);

    byte[] readBytes = getBytes(originalStream, 3);
    printBytes(readBytes); // prints: 1 2 3

    readBytes = getBytes(originalStream, 3);
    printBytes(readBytes); // prints: 4 5 6

    // now let's use our TryReadInputStream

    originalStream = new ByteArrayInputStream(bytes);

    InputStream wrappedStream = new TryReadInputStream(originalStream, 10);

    readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // NOTE: no manual call to "unread"(!) because TryReadInputStream handles this internally
    printBytes(readBytes); // prints 1 2 3

    readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); 
    printBytes(readBytes); // prints 1 2 3

    readBytes = ((TryReadInputStream) wrappedStream).tryRead(3);
    printBytes(readBytes); // prints 1 2 3

    // we can also call normal read which will actually read the bytes without "writing them back"
    readBytes = getBytes(wrappedStream, 3);
    printBytes(readBytes); // prints 1 2 3

    readBytes = getBytes(wrappedStream, 3);
    printBytes(readBytes); // prints 4 5 6

    readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // now we can try read next bytes
    printBytes(readBytes); // prints 7 8 9

    readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); 
    printBytes(readBytes); // prints 7 8 9


  }



}

Display last git commit comment

For something a little more readable, run this command once:

git config --global alias.lg "log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --date=relative"

so that when you then run:

git lg

you get a nice readout. To show only the last line:

git lg -1

Solution found here

HTML/JavaScript: Simple form validation on submit

You have several errors there.

First, you have to return a value from the function in the HTML markup: <form name="ff1" method="post" onsubmit="return validateForm();">

Second, in the JSFiddle, you place the code inside onLoad which and then the form won't recognize it - and last you have to return true from the function if all validation is a success - I fixed some issues in the update:

https://jsfiddle.net/mj68cq0b/

function validateURL(url) {
    var reurl = /^(http[s]?:\/\/){0,1}(www\.){0,1}[a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,5}[\.]{0,1}/;
    return reurl.test(url);
}

function validateForm()
{
    // Validate URL
    var url = $("#frurl").val();
    if (validateURL(url)) { } else {
        alert("Please enter a valid URL, remember including http://");
        return false;
    }

    // Validate Title
    var title = $("#frtitle").val();
    if (title=="" || title==null) {
        alert("Please enter only alphanumeric values for your advertisement title");
        return false;
    }

    // Validate Email
    var email = $("#fremail").val();
    if ((/(.+)@(.+){2,}\.(.+){2,}/.test(email)) || email=="" || email==null) { } else {
        alert("Please enter a valid email");
        return false;
    }
  return true;
}

Docker Error bind: address already in use

I was getting the below error when i was trying to launch a new conatier- listen tcp 0.0.0.0:8080: bind: address already in use.

Solution: netstat -tulnp | grep 8080

[[email protected] (aws_main) ~]# netstat -tulnp | grep 8080 tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 12749/java [[email protected] (aws_main) ~]#

kill -9 12749

Then try to relaunch the container it should work

Get values from label using jQuery

While this question is rather old, and has been answered, I thought I'd take the time to offer a couple of options that are, as yet, not addressed in other answers.

Given the corrected HTML (camelCasing the id attribute-value) of:

<label year="2010" month="6" id="currentMonth"> June &nbsp;2010</label>

You could use regular expressions to extract the month-name, and year:

// gets the eleent with an id equal to 'currentMonth',
// retrieves its text-content,
// uses String.prototype.trim() to remove leading and trailing white-space:
var labelText = $('#currentMonth').text().trim(),
    // finds the sequence of one, or more, letters (a-z, inclusive)
    // at the start (^) of the string, and retrieves the first match from
    // the array returned by the match() method:
    month = labelText.match(/^[a-z]+/i)[0],
    // finds the sequence of numbers (\d) of length 2-4 ({2,4}) characters,
    // at the end ($) of the string:
    year = labelText.match(/\d{2,4}$/)[0];

_x000D_

var labelText = $('#currentMonth').text().trim(),_x000D_
    month = labelText.match(/^[a-z]+/i)[0],_x000D_
    year = labelText.match(/\d{2,4}$/)[0];_x000D_
_x000D_
console.log(month, year);

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<label year="2010" month="6" id="currentMonth"> June &nbsp;2010</label>

_x000D_

Rather than regular expressions, though, you could instead use custom data-* attributes (which work in HTML 4.x, despite being invalid under the doctype, but are valid under HTML 5):

_x000D_

var label = $('#currentMonth'),_x000D_
    month = label.data('month'),_x000D_
    year = label.data('year');_x000D_
_x000D_
console.log(month, year);

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<label data-year="2010" data-month="6" id="currentMonth"> June &nbsp;2010</label>

_x000D_

Note that this will output 6 (for the data-month), rather than 'June' as in the previous example, though if you use an array to tie numbers to month-names, that can be solved easily:

_x000D_

var monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],_x000D_
    label = $('#currentMonth'),_x000D_
    month = monthNames[+label.data('month') - 1],_x000D_
    year = label.data('year');_x000D_
_x000D_
console.log(month, year);

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<label data-year="2010" data-month="6" id="currentMonth"> June &nbsp;2010</label>

_x000D_

Similarly, the above could be easily transcribed to the native DOM (in compliant browsers):

_x000D_

var monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],_x000D_
    label = document.getElementById('currentMonth'),_x000D_
    month = monthNames[+label.dataset.month - 1],_x000D_
    year = label.dataset.year;_x000D_
_x000D_
console.log(month, year);

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<label data-year="2010" data-month="6" id="currentMonth"> June &nbsp;2010</label>

_x000D_

References:

JavaScript:
jQuery:
- data().

How to use find command to find all files with extensions from list?

find -regex ".*\.\(jpg\|gif\|png\|jpeg\)"

php error: Class 'Imagick' not found

Debian 9

I just did the following and everything else needed got automatically installed as well.

sudo apt-get -y -f install php-imagick
sudo /etc/init.d/apache2 restart

ValueError: unsupported pickle protocol: 3, python2 pickle can not load the file dumped by python 3 pickle?

Pickle uses different protocols to convert your data to a binary stream.

In python 2 there are 3 different protocols (0, 1, 2) and the default is 0.
In python 3 there are 5 different protocols (0, 1, 2, 3, 4) and the default is 3.

You must specify in python 3 a protocol lower than 3 in order to be able to load the data in python 2. You can specify the protocol parameter when invoking pickle.dump.

Error importing SQL dump into MySQL: Unknown database / Can't create database

This is a known bug at MySQL.

bug 42996
bug 40477

As you can see this has been a known issue since 2008 and they have not fixed it yet!!!

WORK AROUND
You first need to create the database to import. It doesn't need any tables. Then you can import your database.

first start your MySQL command line (apply username and password if you need to)
C:\>mysql -u user -p

Create your database and exit

mysql> DROP DATABASE database;  
mysql> CREATE DATABASE database;  
mysql> Exit

Import your selected database from the dump file
C:\>mysql -u user -p -h localhost -D database -o < dumpfile.sql

You can replace localhost with an IP or domain for any MySQL server you want to import to. The reason for the DROP command in the mysql prompt is to be sure we start with an empty and clean database.

What is the difference between include and require in Ruby?

'Load'- inserts a file's contents.(Parse file every time the file is being called)

'Require'- inserts a file parsed content.(File parsed once and stored in memory)

'Include'- includes the module into the class and can use methods inside the module as class's instance method

'Extend'- includes the module into the class and can use methods inside the module as class method

Insert string at specified position

Use the stringInsert function rather than the putinplace function. I was using the later function to parse a mysql query. Although the output looked alright, the query resulted in a error which took me a while to track down. The following is my version of the stringInsert function requiring only one parameter.

function stringInsert($str,$insertstr,$pos)
{
    $str = substr($str, 0, $pos) . $insertstr . substr($str, $pos);
    return $str;
}

ASP.NET 5 MVC: unable to connect to web server 'IIS Express'

I'm using VS2017, I Disable Tool > Options > Debugging > Enable JavaScript debugging for ASP.NET then work.

Handle file download from ajax post

see: http://www.henryalgus.com/reading-binary-files-using-jquery-ajax/ it'll return a blob as a response, which can then be put into filesaver

I want to exception handle 'list index out of range.'

Handling the exception is the way to go:

try:
    gotdata = dlist[1]
except IndexError:
    gotdata = 'null'

Of course you could also check the len() of dlist; but handling the exception is more intuitive.

How can I use a search engine to search for special characters?

Unfortunately, there doesn't appear to be a magic bullet. Bottom line up front: "context".

Google indeed ignores most punctuation, with the following exceptions:

Punctuation in popular terms that have particular meanings, like [ C++ ] or [ C# ] (both are names of programming languages), are not ignored.
The dollar sign ($) is used to indicate prices. [ nikon 400 ] and [ nikon $400 ] will give different results.
The hyphen - is sometimes used as a signal that the two words around it are very strongly connected. (Unless there is no space after the - and a space before it, in which case it is a negative sign.)
The underscore symbol _ is not ignored when it connects two words, e.g. [ quick_sort ].

As such, it is not well suited for these types of searchs. Google Code however does have syntax for searching through their code projects, that includes a robust language/syntax for dealing with "special characters". If looking at someone else's code could help solve a problem, this may be an option.

Unfortunately, this is not a limitation unique to google. You may find that your best successes hinge on providing as much 'context' to the problem as possible. If you are searching to find what $- means, providing information about the problem's domain may yield good results.

For example, searching "special perl variables" quickly yields your answer in the first entry on the results page.

"No backupset selected to be restored" SQL Server 2012

My problem was that my user was in the Builtin-Administrators group and no user with Sysadmin-role on SQL Server. I just started the Management Studio as Administrator. This way it was possible to restore the database.

Can't get private key with openssl (no start line:pem_lib.c:703:Expecting: ANY PRIVATE KEY)

I ran into the 'Expecting: ANY PRIVATE KEY' error when using openssl on Windows (Ubuntu Bash and Git Bash had the same issue).

The cause of the problem was that I'd saved the key and certificate files in Notepad using UTF8. Resaving both files in ANSI format solved the problem.

Why use #define instead of a variable

Mostly stylistic these days. When C was young, there was no such thing as a const variable. So if you used a variable instead of a #define, you had no guarantee that somebody somewhere wouldn't change the value of it, causing havoc throughout your program.

In the old days, FORTRAN passed even constants to subroutines by reference, and it was possible (and headache inducing) to change the value of a constant like '2' to be something different. One time, this happened in a program I was working on, and the only hint we had that something was wrong was we'd get an ABEND (abnormal end) when the program hit the STOP 999 that was supposed to end it normally.

How to add two edit text fields in an alert dialog

Use these lines in the code, because the textEntryView is the parent of username edittext and password edittext.

    final EditText input1 = (EditText) textEntryView .findViewById(R.id.username); 
    final EditText input2 = (EditText) textEntryView .findViewById(R.id.password);

Make just one slide different size in Powerpoint

You can't. You can only have one slide size and one orientation per presentation.

Are you projecting the presentation or delivering it on a laptop? If so, the size is sort of irrelevant.
Regardless of the slide size, the projected/displayed image will never be longer or wider than the projector/display accepts.

What is the difference between using constructor vs getInitialState in React / React Native?

The big difference is start from where they are coming from, so constructor is the constructor of your class in JavaScript, on the other side, getInitialState is part of the lifecycle of React . The constructor method is a special method for creating and initializing an object created with a class.

How to set value to form control in Reactive Forms in Angular

In Reactive Form, there are 2 primary solutions to update value(s) of form field(s).

setValue:

Initialize Model Structure in Constructor:

this.newForm = this.formBuilder.group({  
   firstName: ['', [Validators.required, Validators.minLength(3), Validators.maxLength(8)]],
   lastName: ['', [Validators.required, Validators.minLength(3), Validators.maxLength(8)]]
});

If you want to update all fields of form:

this.newForm.setValue({
   firstName: 'abc',
   lastName: 'def'
});

If you want to update specific field of form:

this.newForm.controls.firstName.setValue('abc');

Note: It’s mandatory to provide complete model structure for all form field controls within the FormGroup. If you miss any property or subset collections, then it will throw an exception.

patchValue:

If you want to update some/ specific fields of form:
```
this.newForm.patchValue({
   firstName: 'abc'
});
```

Note: It’s not mandatory to provide model structure for all/ any form field controls within the FormGroup. If you miss any property or subset collections, then it will not throw any exception.

How to remove Left property when position: absolute?

left:auto;

This will default the left back to the browser default.

So if you have your Markup/CSS as:

<div class="myClass"></div>

.myClass
{
  position:absolute;
  left:0;
}

When setting RTL, you could change to:

<div class="myClass rtl"></div>

.myClass
{
  position:absolute;
  left:0;
}
.myClass.rtl
{
  left:auto;
  right:0;
}

SVG drop shadow using css3

Probably an evolution, it appears that inline css filters works nicely on elements, in a certain way.

Declaring a drop-shadow css filter, in an svg element, in both a class or inline does NOT works, as specified earlier.

But, at least in Firefox, with the following wizardry:

Appending the filter declaration inline, with javascript, after DOM load.

_x000D_

// Does not works, with regular dynamic css styling:

shadow0.oninput = () => {
  rect1.style.filter = "filter:drop-shadow(0 0 " + shadow0.value + "rem black);"
}

// Okay! Inline styling, appending.

shadow1.oninput = () => {
  rect1.style += " ;filter:drop-shadow(0 0 " + shadow1.value + "rem black);"
  rect2.style += " ;filter:drop-shadow(0 0 " + shadow1.value + "rem black);"
}

_x000D_

<h2>Firefox only</h2>
<h4>
Does not works! 
<input id="shadow0" type="number" min="0" max="100" step="0.1">

 | Okay!
<input id="shadow1" type="number" min="0" max="100" step="0.1">

<svg viewBox="0 0 120 70">  
    <rect id="rect1" x="10" y="10" width="100" height="50" fill="#c66" />
    
    <!-- Inline style declaration does NOT works at svg level, no shadow at loading: -->
    <rect id="rect2" x="40" y="30" width="10" height="10" fill="#aaa" style="filter:drop-shadow(0 0 20rem black)" />
    
</svg>

_x000D_

How to check Django version

There is an undocumented utils versions module in Django:

https://github.com/django/django/blob/master/django/utils/version.py

With that, you can get the normal version as a string or a detailed version tuple:

>>> from django.utils import version
>>> version.get_version()
... 1.9
>>> version.get_complete_version()
... (1, 9, 0, 'final', 0)

Not equal <> != operator on NULL

The only test for NULL is IS NULL or IS NOT NULL. Testing for equality is nonsensical because by definition one doesn't know what the value is.

Here is a wikipedia article to read:

https://en.wikipedia.org/wiki/Null_(SQL)

DataTable: How to get item value with row name and column name? (VB)

'Create a class to hold the pair...

        Public Class ColumnValue
            Public ColumnName As String
            Public ColumnValue As New Object
        End Class

    'Build the pair...

        For Each row In [YourDataTable].Rows

              For Each item As DataColumn In row.Table.Columns
                Dim rowValue As New ColumnValue
                rowValue.ColumnName = item.Caption
                rowValue.ColumnValue = row.item(item.Ordinal)
                RowValues.Add(rowValue)
                rowValue = Nothing
              Next

        ' Now you can grab the value by the column name...

        Dim results = (From p In RowValues Where p.ColumnName = "MyColumn" Select  p.ColumnValue).FirstOrDefault    

        Next

How to print the current Stack Trace in .NET without any exception?

You can also do this in the Visual Studio debugger without modifying the code.

Create a breakpoint where you want to see the stack trace.
Right-click the breakpoint and select "Actions..." in VS2015. In VS2010, select "When Hit...", then enable "Print a message".
Make sure "Continue execution" is selected.
Type in some text you would like to print out.
Add $CALLSTACK wherever you want to see the stack trace.
Run the program in the debugger.

Of course, this doesn't help if you're running the code on a different machine, but it can be quite handy to be able to spit out a stack trace automatically without affecting release code or without even needing to restart the program.

Programmatically set TextBlock Foreground Color

Foreground needs a Brush, so you can use

textBlock.Foreground = Brushes.Navy;

If you want to use the color from RGB or ARGB then

textBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Color.FromArgb(100, 255, 125, 35));

textBlock.Foreground = new System.Windows.Media.SolidColorBrush(Colors.Navy);

To get the Color from Hex

textBlock.Foreground = new System.Windows.Media.SolidColorBrush((Color)ColorConverter.ConvertFromString("#FFDFD991"));

How to check type of files without extensions in python?

You can also install the official file binding for Python, a library called file-magic (it does not use ctypes, like python-magic).

It's available on PyPI as file-magic and on Debian as python-magic. For me this library is the best to use since it's available on PyPI and on Debian (and probably other distributions), making the process of deploying your software easier. I've blogged about how to use it, also.

How to fix "set SameSite cookie to none" warning?

As the new feature comes, SameSite=None cookies must also be marked as Secure or they will be rejected.

One can find more information about the change on chromium updates and on this blog post

Note: not quite related directly to the question, but might be useful for others who landed here as it was my concern at first during development of my website:

if you are seeing the warning from question that lists some 3rd party sites (in my case it was google.com, huh) - that means they need to fix it and it's nothing to do with your site. Of course unless the warning mentions your site, in which case adding Secure should fix it.

Resize a picture to fit a JLabel

You can try it:

ImageIcon imageIcon = new ImageIcon(new ImageIcon("icon.png").getImage().getScaledInstance(20, 20, Image.SCALE_DEFAULT));
label.setIcon(imageIcon);

Or in one line:

label.setIcon(new ImageIcon(new ImageIcon("icon.png").getImage().getScaledInstance(20, 20, Image.SCALE_DEFAULT)));

The execution time is much more faster than File and ImageIO.

I recommend you to compare the two solutions in a loop.

How to call a function within class?

Since these are member functions, call it as a member function on the instance, self.

def isNear(self, p):
    self.distToPoint(p)
    ...

How to pass an object into a state using UI-router?

In version 0.2.13, You should be able to pass objects into $state.go,

$state.go('myState', {myParam: {some: 'thing'}})

$stateProvider.state('myState', {
                url: '/myState/{myParam:json}',
                params: {myParam: null}, ...

and then access the parameter in your controller.

$stateParams.myParam //should be {some: 'thing'}

myParam will not show up in the URL.

Source:

See the comment by christopherthielen https://github.com/angular-ui/ui-router/issues/983, reproduced here for convenience:

christopherthielen: Yes, this should be working now in 0.2.13.

.state('foo', { url: '/foo/:param1?param2', params: { param3: null } // null is the default value });

$state.go('foo', { param1: 'bar', param2: 'baz', param3: { id: 35, name: 'what' } });

$stateParams in 'foo' is now { param1: 'bar', param2: 'baz', param3: { id: 35, name: 'what' } }

url is /foo/bar?param2=baz.

Using Html.ActionLink to call action on different controller

An alternative solution would be to use the Url helper object to set the href attribute of an <a> tag like:

<a href="@Url.Action("Details", "Product",new { id=item.ID }) )">Details</a>

Python try-else

Looking at Python reference it seems that else is executed after try when there's no exception. The optional else clause is executed if and when control flows off the end of the try clause. 2 Exceptions in the else clause are not handled by the preceding except clauses.

Dive into python has an example where, if I understand correctly, in try block they try to import a module, when that fails you get exception and bind default but when it works you have an option to go into else block and bind what is required (see link for the example and explanation).

If you tried to do work in catch block it might throw another exception - I guess that's where the else block comes handy.

Read connection string from web.config

using System.Configuration;


string conn = ConfigurationManager.ConnectionStrings["ConStringName"].ToString();

How can I remount my Android/system as read-write in a bash script using adb?

I could not get the mount command to work without specifying the dev block to mount as /system

#cat /proc/mounts returns ( only the system line here )
/dev/stl12 /system rfs ro,relatime,vfat,log_off,check=no,gid/uid/rwx,iocharset=utf8 0 0

so my working command is
mount -o rw,remount -t rfs /dev/stl12 /system

How to make an alert dialog fill 90% of screen size?

My answer is based on the koma's but it doesn't require to override onStart but only onCreateView which is almost always overridden by default when you create new fragments.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.your_fragment_layout, container);

    Rect displayRectangle = new Rect();
    Window window = getDialog().getWindow();
    window.getDecorView().getWindowVisibleDisplayFrame(displayRectangle);

    v.setMinimumWidth((int)(displayRectangle.width() * 0.9f));
    v.setMinimumHeight((int)(displayRectangle.height() * 0.9f));

    return v;
}

I've tested it on Android 5.0.1.

How to implement a ViewPager with different Fragments / Layouts

Create new instances in your fragments and do like so in your Activity

 private class SlidePagerAdapter extends FragmentStatePagerAdapter {
    public SlidePagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch(position){
            case 0:
                return Fragment1.newInstance();
            case 1:
                return Fragment2.newInstance();
            case 2:
                return Fragment3.newInstance();
            case 3:
                return Fragment4.newInstance();


            default: break;

        }
        return null;
    }

WAMP Cannot access on local network 403 Forbidden

For Apache 2.4.9

in addition, look at the httpd-vhosts.conf file in C:\wamp\bin\apache\apache2.4.9\conf\extra

<VirtualHost *:80>
ServerName localhost
ServerAlias localhost
DocumentRoot C:/wamp/www
<Directory "C:/wamp/www/">
Options Indexes FollowSymLinks MultiViews
AllowOverride all
Require local
</Directory>
</VirtualHost>

Change to:

<VirtualHost *:80>
ServerName localhost
ServerAlias localhost
DocumentRoot C:/wamp/www
<Directory "C:/wamp/www/">
Options Indexes FollowSymLinks MultiViews
AllowOverride all
Require all granted
</Directory>
</VirtualHost>

changing from "Require local" to "Require all granted" solved the error 403 in my local network

How do I change the ID of a HTML element with JavaScript?

It does work in Firefox (including 2.0.0.20). See http://jsbin.com/akili (add /edit to the url to edit):

<p id="one">One</p>
<a href="#" onclick="document.getElementById('one').id = 'two'; return false">Link2</a>

The first click changes the id to "two", the second click errors because the element with id="one" now can't be found!

Perhaps you have another element already with id="two" (FYI you can't have more than one element with the same id).

HTML text-overflow ellipsis detection

elem.offsetWdith VS ele.scrollWidth This work for me! https://jsfiddle.net/gustavojuan/210to9p1/

$(function() {
  $('.endtext').each(function(index, elem) {
    debugger;
    if(elem.offsetWidth !== elem.scrollWidth){
      $(this).css({color: '#FF0000'})
    }
  });
});

How to access JSON Object name/value?

The JSON you are receiving is in string. You have to convert it into JSON object You have commented the most important line of code

data = JSON.parse(data);

Or if you are using jQuery

data = $.parseJSON(data)

Convert Pandas Column to DateTime

raw_data['Mycol'] =  pd.to_datetime(raw_data['Mycol'], format='%d%b%Y:%H:%M:%S.%f')

works, however it results in a Python warning of A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead

I would guess this is due to some chaining indexing.

How to pass variable number of arguments to printf/sprintf

You are looking for variadic functions. printf() and sprintf() are variadic functions - they can accept a variable number of arguments.

This entails basically these steps:

The first parameter must give some indication of the number of parameters that follow. So in printf(), the "format" parameter gives this indication - if you have 5 format specifiers, then it will look for 5 more arguments (for a total of 6 arguments.) The first argument could be an integer (eg "myfunction(3, a, b, c)" where "3" signifies "3 arguments)
Then loop through and retrieve each successive argument, using the va_start() etc. functions.

There are plenty of tutorials on how to do this - good luck!

java build path problems

To configure your JRE in eclipse:

Window > Preferences > Java > Installed JREs...
Click Add
Find the directory of your JDK > Click OK

Apache VirtualHost 403 Forbidden

For apache Ubuntu 2.4.7 , I finally found you need to white list your virtual host in apache2.conf

# access here, or in any related virtual host.
<Directory /home/gav/public_html/>
    Options FollowSymLinks
    AllowOverride None
    Require all granted
</Directory>

Extract subset of key-value pairs from Python dictionary object?

solution

from operator import itemgetter
from typing import List, Dict, Union


def subdict(d: Union[Dict, List], columns: List[str]) -> Union[Dict, List[Dict]]:
    """Return a dict or list of dicts with subset of 
    columns from the d argument.
    """
    getter = itemgetter(*columns)

    if isinstance(d, list):
        result = []
        for subset in map(getter, d):
            record = dict(zip(columns, subset))
            result.append(record)
        return result
    elif isinstance(d, dict):
        return dict(zip(columns, getter(d)))

    raise ValueError('Unsupported type for `d`')

examples of use

# pure dict

d = dict(a=1, b=2, c=3)
print(subdict(d, ['a', 'c']))

>>> In [5]: {'a': 1, 'c': 3}

# list of dicts

d = [
    dict(a=1, b=2, c=3),
    dict(a=2, b=4, c=6),
    dict(a=4, b=8, c=12),
]

print(subdict(d, ['a', 'c']))

>>> In [5]: [{'a': 1, 'c': 3}, {'a': 2, 'c': 6}, {'a': 4, 'c': 12}]

Log4j output not displayed in Eclipse console

Check your log4j.properties file

Check easy example here at here.

How to start an application without waiting in a batch file?

I used start /b for this instead of just start and it ran without a window for each command, so there was no waiting.

Install numpy on python3.3 - Install pip for python3

On fedora/rhel/centos you need to

sudo yum install -y python3-devel

before

mkvirtualenv -p /usr/bin/python3.3 test-3.3
pip install numpy

otherwise you'll get

SystemError: Cannot compile 'Python.h'. Perhaps you need to install python-dev|python-devel.

socket programming multiple client to one server

I guess the problem is that you need to start a separate thread for each connection and call serverSocket.accept() in a loop to accept more than one connection.

It is not a problem to have more than one connection on the same port.

What does "xmlns" in XML mean?

It means XML namespace.

Basically, every element (or attribute) in XML belongs to a namespace, a way of "qualifying" the name of the element.

Imagine you and I both invent our own XML. You invent XML to describe people, I invent mine to describe cities. Both of us include an element called name. Yours refers to the person’s name, and mine to the city name—OK, it’s a little bit contrived.

<person>
    <name>Rob</name>
    <age>37</age>
    <homecity>
        <name>London</name>
        <lat>123.000</lat>
        <long>0.00</long>
    </homecity>
</person>

If our two XMLs were combined into a single document, how would we tell the two names apart? As you can see above, there are two name elements, but they both have different meanings.

The answer is that you and I would both assign a namespace to our XML, which we would make unique:

<personxml:person xmlns:personxml="http://www.your.example.com/xml/person"
                  xmlns:cityxml="http://www.my.example.com/xml/cities">
    <personxml:name>Rob</personxml:name>
    <personxml:age>37</personxml:age>
    <cityxml:homecity>
        <cityxml:name>London</cityxml:name>
        <cityxml:lat>123.000</cityxml:lat>
        <cityxml:long>0.00</cityxml:long>
    </cityxml:homecity>
</personxml:person>

Now we’ve fully qualified our XML, there is no ambiguity as to what each name element means. All of the tags that start with personxml: are tags belonging to your XML, all the ones that start with cityxml: are mine.

There are a few points to note:

If you exclude any namespace declarations, things are considered to be in the default namespace.
If you declare a namespace without the identifier, that is, xmlns="http://somenamespace", rather than xmlns:rob="somenamespace", it specifies the default namespace for the document.
The actual namespace itself, often a IRI, is of no real consequence. It should be unique, so people tend to choose a IRI/URI that they own, but it has no greater meaning than that. Sometimes people will place the schema (definition) for the XML at the specified IRI, but that is a convention of some people only.
The prefix is of no consequence either. The only thing that matters is what namespace the prefix is defined as. Several tags beginning with different prefixes, all of which map to the same namespace are considered to be the same.

For instance, if the prefixes personxml and mycityxml both mapped to the same namespace (as in the snippet below), then it wouldn't matter if you prefixed a given element with personxml or mycityxml, they'd both be treated as the same thing by an XML parser. The point is that an XML parser doesn't care what you've chosen as the prefix, only the namespace it maps too. The prefix is just an indirection pointing to the namespace.
```
<personxml:person 
     xmlns:personxml="http://example.com/same/url"
     xmlns:mycityxml="http://example.com/same/url" />
```
Attributes can be qualified but are generally not. They also do not inherit their namespace from the element they are on, as opposed to elements (see below).

Also, element namespaces are inherited from the parent element. In other words I could equally have written the above XML as

<person xmlns="http://www.your.example.com/xml/person">
    <name>Rob</name>
    <age>37</age>
    <homecity xmlns="http://www.my.example.com/xml/cities">
        <name>London</name>
        <lat>123.000</lat>
        <long>0.00</long>
    </homecity>
</person>

Where is the Java SDK folder in my computer? Ubuntu 12.04

On Ubuntu 14.04, it is in /usr/lib/jvm/default-java.

jQuery event handlers always execute in order they were bound - any way around this?

You can do a custom namespace of events.

$('span').bind('click.doStuff1',function(){doStuff1();});
$('span').bind('click.doStuff2',function(){doStuff2();});

Then, when you need to trigger them you can choose the order.

$('span').trigger('click.doStuff1').trigger('click.doStuff2');

$('span').trigger('click.doStuff2').trigger('click.doStuff1');

Also, just triggering click SHOULD trigger both in the order they were bound... so you can still do

$('span').trigger('click');

How to get ID of clicked element with jQuery

You just need to remove the hash from the beginning:

$('a.pagerlink').click(function() { 
    var id = $(this).attr('id').substring(1);
    $container.cycle(id); 
    return false; 
});

Replace all spaces in a string with '+'

Do this recursively:

public String replaceSpace(String s){
    if (s.length() < 2) {
        if(s.equals(" "))
            return "+";
        else
            return s;
    }
    if (s.charAt(0) == ' ')
        return "+" + replaceSpace(s.substring(1));
    else
        return s.substring(0, 1) + replaceSpace(s.substring(1));
}

Accessing constructor of an anonymous class

It doesn't make any sense to have a named overloaded constructor in an anonymous class, as there would be no way to call it, anyway.

Depending on what you are actually trying to do, just accessing a final local variable declared outside the class, or using an instance initializer as shown by Arne, might be the best solution.

In C++ check if std::vector<string> contains a certain value

You can use std::find as follows:

if (std::find(v.begin(), v.end(), "abc") != v.end())
{
  // Element in vector.
}

To be able to use std::find: include <algorithm>.

401 Unauthorized: Access is denied due to invalid credentials

I had this issue on IIS 10. This is how I fixed it.

Open IIS
Select The Site
Open Authentication
Edit Anonymous Authentication
Select Application Pool Identity

VBA - Run Time Error 1004 'Application Defined or Object Defined Error'

Assgining a value that starts with a "=" will kick in formula evaluation and gave in my case the above mentioned error #1004. Prepending it with a space was the ticket for me.

How can I resolve "Your requirements could not be resolved to an installable set of packages" error?

Add "barryvdh/laravel-cors": "^0.7.3" at the end of require array inside composer.json

Save composer.json and run composer update

You are done !

Difference between StringBuilder and StringBuffer

StringBuffer is mutable. It can change in terms of length and content. StringBuffers are thread-safe, meaning that they have synchronized methods to control access so that only one thread can access a StringBuffer object's synchronized code at a time. Thus, StringBuffer objects are generally safe to use in a multi-threaded environment where multiple threads may be trying to access the same StringBuffer object at the same time.

StringBuilder The StringBuilder class is very similar to StringBuffer, except that its access is not synchronized so that it is not thread-safe. By not being synchronized, the performance of StringBuilder can be better than StringBuffer. Thus, if you are working in a single-threaded environment, using StringBuilder instead of StringBuffer may result in increased performance. This is also true of other situations such as a StringBuilder local variable (ie, a variable within a method) where only one thread will be accessing a StringBuilder object.

Requested bean is currently in creation: Is there an unresolvable circular reference?

In general, the way to deal with circular dependencies is to use setter injection.

I tried the setter injection code that you posted, and it worked for me. I would imagine the reason you are getting the exception is because Bean1 and Bean2 are in the com.myapp.beans package, and you don't have component scanning enabled for that package.

You'd need to add the following to your spring configuration:

<context:component-scan base-package="com.bullethq.accounts.web"/>

or move the beans to a package which is being automatically scanned by Spring.

Failed to instantiate module [$injector:unpr] Unknown provider: $routeProvider

In my case it was because the file was minified with wrong scope. Use Array!

app.controller('StoreController', ['$http', function($http) {
    ...
}]);

Coffee syntax:

app.controller 'StoreController', Array '$http', ($http) ->
  ...

Python slice first and last element in list

Fun new approach to "one-lining" the case of an anonymously split thing such that you don't split it twice, but do all the work in one line is using the walrus operator, :=, to perform assignment as an expression, allowing both:

first, last = (split_str := a.split("-"))[0], split_str[-1]

and:

first, last = (split_str := a.split("-"))[::len(split_str)-1]

Mind you, in both cases it's essentially exactly equivalent to doing on one line:

split_str = a.split("-")

then following up with one of:

first, last = split_str[0], split_str[-1]
first, last = split_str[::len(split_str)-1]

including the fact that split_str persists beyond the line it was used and accessed on. It's just technically meeting the requirements of one-lining, while being fairly ugly. I'd never recommend it over unpacking or itemgetter solutions, even if one-lining was mandatory (ruling out the non-walrus versions that explicitly index or slice a named variable and must refer to said named variable twice).

How to get 30 days prior to current date?

Try using the excellent Datejs JavaScript date library (the original is no longer maintained so you may be interested in this actively maintained fork instead):

Date.today().add(-30).days(); // or...
Date.today().add({days:-30});

[Edit]

See also the excellent Moment.js JavaScript date library:

moment().subtract(30, 'days'); // or...
moment().add(-30, 'days');

Parsing JSON array into java.util.List with Gson

Below code is using com.google.gson.JsonArray. I have printed the number of element in list as well as the elements in List

import java.util.ArrayList;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;


public class Test {

    static String str = "{ "+ 
            "\"client\":\"127.0.0.1\"," + 
            "\"servers\":[" + 
            "    \"8.8.8.8\"," + 
            "    \"8.8.4.4\"," + 
            "    \"156.154.70.1\"," + 
            "    \"156.154.71.1\" " + 
            "    ]" + 
            "}";

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {

            JsonParser jsonParser = new JsonParser();
            JsonObject jo = (JsonObject)jsonParser.parse(str);
            JsonArray jsonArr = jo.getAsJsonArray("servers");
            //jsonArr.
            Gson googleJson = new Gson();
            ArrayList jsonObjList = googleJson.fromJson(jsonArr, ArrayList.class);
            System.out.println("List size is : "+jsonObjList.size());
                    System.out.println("List Elements are  : "+jsonObjList.toString());


        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

OUTPUT

List size is : 4

List Elements are  : [8.8.8.8, 8.8.4.4, 156.154.70.1, 156.154.71.1]

Download TS files from video stream

I made some changes to dina's answer to avoid attempting to download/combine 1200 parts if there aren't that many.

I also found it helpful to sort by waterfall in the network tab of chrome. This will sort by the time the files are downloaded, so when you are streaming a video the most recently downloaded parts will be at the top, making it easy to find the .ts links.

#!/bin/bash

# Name of the containing folder
GROUP="My Videos"

# Example link: https://vids.net/ABCAED/AADDCDE/m3u8/AADDCDE/AADDCDE_0.ts
# Insert below as: https://vids.net/ABCAED/AADDCDE/m3u8/AADDCDE/AADDCDE

# INSERT LINKS TO VIDEOS HERE
LINK=(
'Title for the video link'
'https://vids.net/ABCAED/AADDCDE/m3u8/AADDCDE/AADDCDE'
'Title for the next video'
'https://vids.net/EECEADFE/EECEADFE/m3u8/EECEADFE/EECEADFE'
)

# ------------------------------------------------------------------------------
mkdir "$GROUP"
cd "$GROUP"

I=0
while [ $I -lt ${#LINK[@]} ]
do
  # create folder for streaming media
  TITLE=${LINK[$I]}
  mkdir "$TITLE"
  cd "$TITLE"
  mkdir 'parts'
  cd 'parts'

  J=$((I + 1))
  URL=${LINK[$J]}

  I=$((I + 2))

  DIR="${URL##*/}"

  # download all streaming media parts
  VID=-1
  while [ $? -eq 0 ];
  do
    VID=$((VID + 1))
    wget $URL'_'$VID.ts
  done

  # combine parts
  COUNTER=0
  while [  $COUNTER -lt $VID ]; do
    echo $DIR'_'$COUNTER.ts | tr " " "\n" >> tslist
    let COUNTER=COUNTER+1
  done
  while read line; do cat $line >> $TITLE.ts; done < tslist

  rm -rf tslist
  mv "$TITLE.ts" "../$TITLE.ts"

  cd ..
  rm -rf 'parts'
  cd ..

done

What is the difference between compare() and compareTo()?

The main difference is in the use of the interfaces:

Comparable (which has compareTo()) requires the objects to be compared (in order to use a TreeMap, or to sort a list) to implement that interface. But what if the class does not implement Comparable and you can't change it because it's part of a 3rd party library? Then you have to implement a Comparator, which is a bit less convenient to use.

Insert into C# with SQLCommand

using (SqlConnection connection = new SqlConnection(connectionString)) 
{
    connection.Open(); 
    using (SqlCommand command = connection.CreateCommand()) 
    { 
        command.CommandText = "INSERT INTO klant(klant_id,naam,voornaam) VALUES(@param1,@param2,@param3)";  

        command.Parameters.AddWithValue("@param1", klantId));  
        command.Parameters.AddWithValue("@param2", klantNaam));  
        command.Parameters.AddWithValue("@param3", klantVoornaam));  

        command.ExecuteNonQuery(); 
    } 
}

Java Replace Character At Specific Position Of String?

If you need to re-use a string, then use StringBuffer:

String str = "hi";
StringBuffer sb = new StringBuffer(str);
while (...) {
    sb.setCharAt(1, 'k');
}

EDIT:

Note that StringBuffer is thread-safe, while using StringBuilder is faster, but not thread-safe.

Best Regular Expression for Email Validation in C#

This C# function uses a regular expression to evaluate whether the passed email address is syntactically valid or not.

public static bool isValidEmail(string inputEmail)
{
   string strRegex = @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
         @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" + 
         @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
   Regex re = new Regex(strRegex);
   if (re.IsMatch(inputEmail))
    return (true);
   else
    return (false);
}

Xcode "Build and Archive" from command line

You mean the validate/share/submit options? I think those are specific to Xcode, and not suited for a command-line build tool.

With some cleverness, I bet you could make a script to do it for you. It looks like they're just stored in ~/Library/MobileDevice/Archived Applications/ with a UUDI and a plist. I can't imagine it would be that hard to reverse engineer the validator either.

The process I'm interested automating is sending builds to beta testers. (Since App Store submission happens infrequently, I don't mind doing it manually, especially since I often need to add new description text.) By doing a pseudo Build+Archive using Xcode's CLI, I can trigger automatic builds from every code commit, create IPA files with embedded provisioning profiles, and email it to testers.

How do you access the value of an SQL count () query in a Java program

        <%
        try{
            Class.forName("com.mysql.cj.jdbc.Driver").newInstance();
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/bala","bala","bala");
            if(con == null) System.out.print("not connected");
            Statement st = con.createStatement();
            String myStatement = "select count(*) as total from locations";
            ResultSet rs = st.executeQuery(myStatement);
            int num = 0;
            while(rs.next()){
                num = (rs.getInt(1));
            }

        }
        catch(Exception e){
            System.out.println(e);  
        }

        %>

How do I programmatically determine operating system in Java?

This code for displaying all information about the system os type,name , java information and so on.

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Properties pro = System.getProperties();
    for(Object obj : pro.keySet()){
        System.out.println(" System  "+(String)obj+"     :  "+System.getProperty((String)obj));
    }
}

How to allow <input type="file"> to accept only image files?

Using this:

<input type="file" accept="image/*">

works in both FF and Chrome.

Auto-increment on partial primary key with Entity Framework Core

To anyone who came across this question who are using SQL Server Database and still having an exception thrown even after adding the following annotation on the int primary key

[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }

Please check your SQL, make sure your the primary key has 'IDENTITY(startValue, increment)' next to it,

CREATE TABLE [dbo].[User]
(
    [Id] INT IDENTITY(1,1) NOT NULL PRIMARY KEY
)

This will make the database increments the id every time a new row is added, with a starting value of 1 and increments of 1.

I accidentally overlooked that in my SQL which cost me an hour of my life, so hopefully this helps someone!!!

What does OpenCV's cvWaitKey( ) function do?

waits milliseconds to check if the key is pressed, if pressed in that interval return its ascii value, otherwise it still -1

Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

Use this, works for me always.

Response.Redirect(Request.RawUrl, false);

Here, Response.Redirect(Request.RawUrl) simply redirects to the url of the current context, while the second parameter "false" indicates to either endResponse or not.

Excel data validation with suggestions/autocomplete

Why not use a Pivot?

Sample Table Filter Pivot

How do I list all remote branches in Git 1.7+?

Git Branching - Remote Branches

git ls-remote

Git documentation.

#define in Java

Java Primitive Specializations Generator supports /* with */, /* define */ and /* if */ ... /* elif */ ... /* endif */ blocks which allow to do some kind of macro generation in Java code, similar to java-comment-preprocessor mentioned in this answer.

JPSG has Maven and Gradle plugins.

Camera access through browser

Update 11/2020: The Google Developer link is (currently) dead. The original article with a LOT more explanations can still be found at web.archive.org.

This question is already a few years old but in that time some additional possibilities have evolved, like accessing the camera directly, displaying a preview and capturing snapshots (e.g. for QR code scanning).

This Google Developers article provides an in-depth explaination of all (?) the ways how to get image/camera data into a web application, from "work everywhere" (even in desktop browsers) to "work only on modern, up-to-date mobile devices with camera". Along with many useful tips.

Explained methods:

Ask for a URL: Easiest but least satisfying.
File input (covered by most other posts here): The data can then be attached to a or manipulated with JavaScript by listening for an onchange event on the input element and then reading the files property of the event target.

<input type="file" accept="image/*" id="file-input">
<script>
  const fileInput = document.getElementById('file-input');

  fileInput.addEventListener('change', (e) => doSomethingWithFiles(e.target.files));
</script>

The files property is a FileList object.

Drag and drop (useful for desktop browsers):

<div id="target">You can drag an image file here</div>
<script>
  const target = document.getElementById('target');

  target.addEventListener('drop', (e) => {
    e.stopPropagation();
    e.preventDefault();

    doSomethingWithFiles(e.dataTransfer.files);
  });

  target.addEventListener('dragover', (e) => {
    e.stopPropagation();
    e.preventDefault();

    e.dataTransfer.dropEffect = 'copy';
  });
</script>

You can get a FileList object from the dataTransfer.files property of the drop event.

Paste from clipboard

<textarea id="target">Paste an image here</textarea>
<script>
  const target = document.getElementById('target');

  target.addEventListener('paste', (e) => {
    e.preventDefault();
    doSomethingWithFiles(e.clipboardData.files);
  });
</script>

e.clipboardData.files is a FileList object again.

Access the camera interactively (necessary if application needs to give instant feedback on what it "sees", like QR codes): Detect camera support with const supported = 'mediaDevices' in navigator; and prompt the user for consent. Then show a realtime preview and copy snapshots to a canvas.

<video id="player" controls autoplay></video>
<button id="capture">Capture</button>
<canvas id="canvas" width=320 height=240></canvas>
<script>
  const player = document.getElementById('player');
  const canvas = document.getElementById('canvas');
  const context = canvas.getContext('2d');
  const captureButton = document.getElementById('capture');

  const constraints = {
    video: true,
  };

  captureButton.addEventListener('click', () => {
    // Draw the video frame to the canvas.
    context.drawImage(player, 0, 0, canvas.width, canvas.height);
  });

  // Attach the video stream to the video element and autoplay.
  navigator.mediaDevices.getUserMedia(constraints)
    .then((stream) => {
      player.srcObject = stream;
    });
</script>

Don't forget to stop the video stream with

player.srcObject.getVideoTracks().forEach(track => track.stop());

Update 11/2020: The Google Developer link is (currently) dead. The original article with a LOT more explanations can still be found at web.archive.org.

'Found the synthetic property @panelState. Please include either "BrowserAnimationsModule" or "NoopAnimationsModule" in your application.'

This error message is often misleading.

You may have forgotten to import the BrowserAnimationsModule. But that was not my problem. I was importing BrowserAnimationsModule in the root AppModule, as everyone should do.

The problem was something completely unrelated to the module. I was animating an*ngIf in the component template but I had forgotten to mention it in the @Component.animations for the component class.

@Component({
  selector: '...',
  templateUrl: './...',
  animations: [myNgIfAnimation] // <-- Don't forget!
})

If you use an animation in a template, you also must list that animation in the component's animations metadata ... every time.

Format date with Moment.js

May be this helps some one who are looking for multiple date formats one after the other by willingly or unexpectedly. Please find the code: I am using moment.js format function on a current date as (today is 29-06-2020) var startDate = moment(new Date()).format('MM/DD/YY'); Result: 06/28/20

what happening is it retains only the year part :20 as "06/28/20", after If I run the statement : new Date(startDate) The result is "Mon Jun 28 1920 00:00:00 GMT+0530 (India Standard Time)",

Then, when I use another format on "06/28/20": startDate = moment(startDate ).format('MM-DD-YYYY'); Result: 06-28-1920, in google chrome and firefox browsers it gives correct date on second attempt as: 06-28-2020. But in IE it is having issues, from this I understood we can apply one dateformat on the given date, If we want second date format, it should be apply on the fresh date not on the first date format result. And also observe that for first time applying 'MM-DD-YYYY' and next 'MM-DD-YY' is working in IE. For clear understanding please find my question in the link: Date went wrong when using Momentjs date format in IE 11

What's better at freeing memory with PHP: unset() or $var = null

For the record, and excluding the time that it takes:

<?php
echo "<hr>First:<br>";
$x = str_repeat('x', 80000);
echo memory_get_usage() . "<br>\n";      
echo memory_get_peak_usage() . "<br>\n"; 
echo "<hr>Unset:<br>";
unset($x);
$x = str_repeat('x', 80000);
echo memory_get_usage() . "<br>\n";      
echo memory_get_peak_usage() . "<br>\n"; 
echo "<hr>Null:<br>";
$x=null;
$x = str_repeat('x', 80000);
echo memory_get_usage() . "<br>\n";      
echo memory_get_peak_usage() . "<br>\n";

echo "<hr>function:<br>";
function test() {
    $x = str_repeat('x', 80000);
}
echo memory_get_usage() . "<br>\n";      
echo memory_get_peak_usage() . "<br>\n"; 

echo "<hr>Reasign:<br>";
$x = str_repeat('x', 80000);
echo memory_get_usage() . "<br>\n";      
echo memory_get_peak_usage() . "<br>\n";

It returns

First:
438296
438352
Unset:
438296
438352
Null:
438296
438352
function:
438296
438352
Reasign:
438296
520216 <-- double usage.

Conclusion, both null and unset free memory as expected (not only at the end of the execution). Also, reassigning a variable holds the value twice at some point (520216 versus 438352)

Adding whitespace in Java

String text = "text";
text += new String(" ");

Create new XML file and write data to it?

PHP has several libraries for XML Manipulation.

The Document Object Model (DOM) approach (which is a W3C standard and should be familiar if you've used it in other environments such as a Web Browser or Java, etc). Allows you to create documents as follows

<?php
    $doc = new DOMDocument( );
    $ele = $doc->createElement( 'Root' );
    $ele->nodeValue = 'Hello XML World';
    $doc->appendChild( $ele );
    $doc->save('MyXmlFile.xml');
?>

Even if you haven't come across the DOM before, it's worth investing some time in it as the model is used in many languages/environments.

Add column with number of days between dates in DataFrame pandas

A list comprehension is your best bet for the most Pythonic (and fastest) way to do this:

[int(i.days) for i in (df.B - df.A)]

i will return the timedelta(e.g. '-58 days')
i.days will return this value as a long integer value(e.g. -58L)
int(i.days) will give you the -58 you seek.

If your columns aren't in datetime format. The shorter syntax would be: df.A = pd.to_datetime(df.A)

Replacing accented characters php

I have tried all sorts based on the variations listed in the answers, but the following worked:

$unwanted_array = array(    'Š'=>'S', 'š'=>'s', 'Ž'=>'Z', 'ž'=>'z', 'À'=>'A', 'Á'=>'A', 'Â'=>'A', 'Ã'=>'A', 'Ä'=>'A', 'Å'=>'A', 'Æ'=>'A', 'Ç'=>'C', 'È'=>'E', 'É'=>'E',
                            'Ê'=>'E', 'Ë'=>'E', 'Ì'=>'I', 'Í'=>'I', 'Î'=>'I', 'Ï'=>'I', 'Ñ'=>'N', 'Ò'=>'O', 'Ó'=>'O', 'Ô'=>'O', 'Õ'=>'O', 'Ö'=>'O', 'Ø'=>'O', 'Ù'=>'U',
                            'Ú'=>'U', 'Û'=>'U', 'Ü'=>'U', 'Ý'=>'Y', 'Þ'=>'B', 'ß'=>'Ss', 'à'=>'a', 'á'=>'a', 'â'=>'a', 'ã'=>'a', 'ä'=>'a', 'å'=>'a', 'æ'=>'a', 'ç'=>'c',
                            'è'=>'e', 'é'=>'e', 'ê'=>'e', 'ë'=>'e', 'ì'=>'i', 'í'=>'i', 'î'=>'i', 'ï'=>'i', 'ð'=>'o', 'ñ'=>'n', 'ò'=>'o', 'ó'=>'o', 'ô'=>'o', 'õ'=>'o',
                            'ö'=>'o', 'ø'=>'o', 'ù'=>'u', 'ú'=>'u', 'û'=>'u', 'ý'=>'y', 'þ'=>'b', 'ÿ'=>'y' );
$str = strtr( $str, $unwanted_array );

angular.element vs document.getElementById or jQuery selector with spin (busy) control

Improvement to kaiser's answer:

var myEl = $document.find('#some-id');

Don't forget to inject $document into your directive

Sort ObservableCollection<string> through C#

Introduction

Basically, if there is a need to display a sorted collection, please consider using the CollectionViewSource class: assign ("bind") its Source property to the source collection — an instance of the ObservableCollection<T> class.

The idea is that CollectionViewSource class provides an instance of the CollectionView class. This is kind of "projection" of the original (source) collection, but with applied sorting, filtering, etc.

References:

Live Shaping

WPF 4.5 introduces "Live Shaping" feature for CollectionViewSource.

References:

Solution

If there still a need to sort an instance of the ObservableCollection<T> class, here is how it can be done. The ObservableCollection<T> class itself does not have sort method. But, the collection could be re-created to have items sorted:

// Animals property setter must raise "property changed" event to notify binding clients.
// See INotifyPropertyChanged interface for details.
Animals = new ObservableCollection<string>
    {
        "Cat", "Dog", "Bear", "Lion", "Mouse",
        "Horse", "Rat", "Elephant", "Kangaroo",
        "Lizard", "Snake", "Frog", "Fish",
        "Butterfly", "Human", "Cow", "Bumble Bee"
    };
...
Animals = new ObservableCollection<string>(Animals.OrderBy(i => i));

Additional details

Please note that OrderBy() and OrderByDescending() methods (as other LINQ–extension methods) do not modify the source collection! They instead create a new sequence (i.e. a new instance of the class that implements IEnumerable<T> interface). Thus, it is necessary to re-create the collection.

Angular checkbox and ng-click

The order of execution of ng-click and ng-model is ambiguous since they do not define clear priorities. Instead you should use ng-change or a $watch on the $scope to ensure that you obtain the correct values of the model variable.

In your case, this should work:

<input type="checkbox" ng-model="vm.myChkModel" ng-change="vm.myClick(vm.myChkModel)">

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Maximum Java heap size of a 32-bit JVM on a 64-bit OS

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vagrant primary box defined but commands still run against all boxes

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Deleting duplicate rows in MySQL in-place, (Assuming you have a timestamp col to sort by) walkthrough:

For those of you without a timestamp or unique column.

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