How to search in an array with preg_match?

$haystack = array (
   'say hello',
   'hello stackoverflow',
   'hello world',
   'foo bar bas'
);

$matches  = preg_grep('/hello/i', $haystack);

print_r($matches);

Output

Array
(
    [1] => say hello
    [2] => hello stackoverflow
    [3] => hello world
)

PHP preg_match - only allow alphanumeric strings and - _ characters

Why to use regex? PHP has some built in functionality to do that

<?php
    $valid_symbols = array('-', '_');
    $string1 = "This is a string*";
    $string2 = "this_is-a-string";

    if(preg_match('/\s/',$string1) || !ctype_alnum(str_replace($valid_symbols, '', $string1))) {
        echo "String 1 not acceptable acceptable";
    }
?>

preg_match('/\s/',$username) will check for blank space

!ctype_alnum(str_replace($valid_symbols, '', $string1)) will check for valid_symbols

PHP is_numeric or preg_match 0-9 validation

Not exactly the same.

From the PHP docs of is_numeric:

'42' is numeric
'1337' is numeric
'1e4' is numeric
'not numeric' is NOT numeric
'Array' is NOT numeric
'9.1' is numeric

With your regex you only check for 'basic' numeric values.

Also is_numeric() should be faster.

Delimiter must not be alphanumeric or backslash and preg_match

You can also use T-Regx library which has automatic delimiters for you:

$matches = pattern("My name is '(.*)' and im fine")->match($string1)->all();

                 // ? No delimiters needed

Regular expression containing one word or another

You just missed an extra pair of brackets for the "OR" symbol. The following should do the trick:

([0-9]+)\s+((\bseconds\b)|(\bminutes\b))

Without those you were either matching a number followed by seconds OR just the word minutes

PHP regular expressions: No ending delimiter '^' found in

Your regex pattern needs to be in delimiters:

$numpattern="/^([0-9]+)$/";

Regex: Specify "space or start of string" and "space or end of string"

(^|\s) would match space or start of string and ($|\s) for space or end of string. Together it's:

(^|\s)stackoverflow($|\s)

PHP - regex to allow letters and numbers only

You left off the / (pattern delimiter) and $ (match end string).

preg_match("/^[a-zA-Z0-9]+$/", $value)

Preg_match backtrack error

When nesting repetition operators, make absolutely sure that there is only one way to match the same match.

Express: How to pass app-instance to routes from a different file?

To make your db object accessible to all controllers without passing it everywhere: make an application-level middleware which attachs the db object to every req object, then you can access it within in every controller.

// app.js
let db = ...;  // your db object initialized
const contextMiddleware = (req, res, next) => {
  req.db=db;
  next();
};
app.use(contextMiddleware);

to avoid passing app instance everywhere, instead, passing routes to where the app is

// routes.js  It's just a mapping.
exports.routes = [
  ['/', controllers.index],
  ['/posts', controllers.posts.index],
  ['/posts/:post', controllers.posts.show]
];

// app.js
var { routes }    = require('./routes');
routes.forEach(route => app.get(...route));
// You can customize this according to your own needs, like adding post request

The final app.js:

// app.js
var express   = require('express');
var app       = express.createServer();

let db = ...;  // your db object initialized
const contextMiddleware = (req, res, next) => {
  req.db=db;
  next();
};
app.use(contextMiddleware);

var { routes }    = require('./routes');
routes.forEach(route => app.get(...route));

app.listen(3000, function() {
  console.log('Application is listening on port 3000');
});

Another version: you can customize this according to your own needs, like adding post request

// routes.js  It's just a mapping.
let get = ({path, callback}) => ({app})=>{
  app.get(path, callback);
}
let post = ({path, callback}) => ({app})=>{
  app.post(path, callback);
}
let someFn = ({path, callback}) => ({app})=>{
  // ...custom logic
  app.get(path, callback);
}
exports.routes = [
  get({path: '/', callback: controllers.index}),
  post({path: '/posts', callback: controllers.posts.index}),
  someFn({path: '/posts/:post', callback: controllers.posts.show}),
];

// app.js
var { routes }    = require('./routes');
routes.forEach(route => route({app}));

Why is document.body null in my javascript?

The body hasn't been defined at this point yet. In general, you want to create all elements before you execute javascript that uses these elements. In this case you have some javascript in the head section that uses body. Not cool.

You want to wrap this code in a window.onload handler or place it after the <body> tag (as mentioned by e-bacho 2.0).

<head>
    <title>Javascript Tests</title>

    <script type="text/javascript">
      window.onload = function() {
        var mySpan = document.createElement("span");
        mySpan.innerHTML = "This is my span!";

        mySpan.style.color = "red";
        document.body.appendChild(mySpan);

        alert("Why does the span change after this alert? Not before?");
      }

    </script>
</head>

See demo.

Excel VBA Check if directory exists error

To check for the existence of a directory using Dir, you need to specify vbDirectory as the second argument, as in something like:

If Dir("C:\2013 Recieved Schedules" & "\" & client, vbDirectory) = "" Then

Note that, with vbDirectory, Dir will return a non-empty string if the specified path already exists as a directory or as a file (provided the file doesn't have any of the read-only, hidden, or system attributes). You could use GetAttr to be certain it's a directory and not a file.

Generating CSV file for Excel, how to have a newline inside a value

putting "\r" at the end of each row actually had the effect of line breaks in excel, but in the .csv it vanished and left an ugly mess where each row was squashed against the next with no space and no line-breaks

JavaScript validation for empty input field

I would like to add required attribute in case user disabled javascript:

<input type="text" id="textbox" required/>

It works on all modern browsers.

How can I change the text color with jQuery?

Place the following in your jQuery mouseover event handler:

$(this).css('color', 'red');

To set both color and size at the same time:

$(this).css({ 'color': 'red', 'font-size': '150%' });

You can set any CSS attribute using the .css() jQuery function.

What killed my process and why?

Let me first explain when and why OOMKiller get invoked?

Say you have 512 RAM + 1GB Swap memory. So in theory, your CPU has access to total of 1.5GB of virtual memory.

Now, for some time everything is running fine within 1.5GB of total memory. But all of sudden (or gradually) your system has started consuming more and more memory and it reached at a point around 95% of total memory used.

Now say any process has requested large chunck of memory from the kernel. Kernel check for the available memory and find that there is no way it can allocate your process more memory. So it will try to free some memory calling/invoking OOMKiller (http://linux-mm.org/OOM).

OOMKiller has its own algorithm to score the rank for every process. Typically which process uses more memory becomes the victim to be killed.

Where can I find logs of OOMKiller?

Typically in /var/log directory. Either /var/log/kern.log or /var/log/dmesg

Hope this will help you.

Some typical solutions:

Increase memory (not swap)
Find the memory leaks in your program and fix them
Restrict memory any process can consume (for example JVM memory can be restricted using JAVA_OPTS)
See the logs and google :)

How to count check-boxes using jQuery?

Assume that you have a tr row with multiple checkboxes in it, and you want to count only if the first checkbox is checked.

You can do that by giving a class to the first checkbox

For example class='mycxk' and you can count that using the filter, like this

$('.mycxk').filter(':checked').length

Cannot deserialize the JSON array (e.g. [1,2,3]) into type ' ' because type requires JSON object (e.g. {"name":"value"}) to deserialize correctly

var objResponse1 = 
JsonConvert.DeserializeObject<List<RetrieveMultipleResponse>>(JsonStr);

worked!

bootstrap 4 file input doesn't show the file name

$(document).on('change', '.custom-file-input', function (event) {
    $(this).next('.custom-file-label').html(event.target.files[0].name);
})

Best of all worlds. Works on dynamically created inputs, and uses actual file name.

Converting a JS object to an array using jQuery

x = [];
for( var i in myObj ) {
    x[i] = myObj[i];
}

How to make a section of an image a clickable link

If you don't want to make the button a separate image, you can use the <area> tag. This is done by using html similar to this:

<img src="imgsrc" width="imgwidth" height="imgheight" alt="alttext" usemap="#mapname">

<map name="mapname">
    <area shape="rect" coords="see note 1" href="link" alt="alttext">
</map>

Note 1: The coords=" " attribute must be formatted in this way: coords="x1,y1,x2,y2" where:

x1=top left X coordinate
y1=top left Y coordinate
x2=bottom right X coordinate
y2=bottom right Y coordinate

Note 2: The usemap="#mapname" attribute must include the #.

EDIT:

I looked at your code and added in the <map> and <area> tags where they should be. I also commented out some parts that were either overlapping the image or seemed there for no use.

<div class="flexslider">
    <ul class="slides" runat="server" id="Ul">                             
        <li class="flex-active-slide" style="background: url(&quot;images/slider-bg-1.jpg&quot;) no-repeat scroll 50% 0px transparent; width: 100%; float: left; margin-right: -100%; position: relative; display: list-item;">
            <div class="container">
                <div class="sixteen columns contain"></div>   
                <img runat="server" id="imgSlide1" style="top: 1px; right: -19px; opacity: 1;" class="item" src="./test.png" data-topimage="7%" height="358" width="728" usemap="#imgmap" />
                <map name="imgmap">
                    <area shape="rect" coords="48,341,294,275" href="http://www.example.com/">
                </map>
                <!--<a href="#" style="display:block; background:#00F; width:356px; height:66px; position:absolute; left:1px; top:-19px; left: 162px; top: 279px;"></a>-->
            </div>
        </li>
    </ul>
</div>
<!-- <ul class="flex-direction-nav">
    <li><a class="flex-prev" href="#"><i class="icon-angle-left"></i></a></li>
    <li><a class="flex-next" href="#"><i class="icon-angle-right"></i></a></li>
</ul> -->

Notes:

The coord="48,341,294,275" is in reference to your screenshot you posted.
The src="./test.png" is the location and name of the screenshot you posted on my computer.
The href="http://www.example.com/" is an example link.

Vue.js data-bind style backgroundImage not working

<div :style="{ backgroundImage: `url(${post.image})` }">

there are multiple ways but i found template string easy and simple

What is the difference between & vs @ and = in angularJS

It took me a hell of a long time to really get a handle on this. The key to me was in understanding that "@" is for stuff that you want evaluated in situ and passed through into the directive as a constant where "=" actually passes the object itself.

There's a nice blog post that explains this this at: http://blog.ramses.io/technical/AngularJS-the-difference-between-@-&-and-=-when-declaring-directives-using-isolate-scopes

Printing result of mysql query from variable

From php docs:

For SELECT, SHOW, DESCRIBE, EXPLAIN and other statements returning resultset, mysql_query() returns a resource on success, or FALSE on error.

For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc, mysql_query() returns TRUE on success or FALSE on error.

The returned result resource should be passed to mysql_fetch_array(), and other functions for dealing with result tables, to access the returned data.

http://php.net/manual/en/function.mysql-query.php

Can table columns with a Foreign Key be NULL?

Yes, the value can be NULL, but you must be explicit. I have experienced this same situation before, and it's easy to forget WHY this happens, and so it takes a little bit to remember what needs to be done.

If the data submitted is cast or interpreted as an empty string, it will fail. However, by explicitly setting the value to NULL when INSERTING or UPDATING, you're good to go.

But this is the fun of programming, isn't it? Creating our own problems and then fixing them! Cheers!

How to open PDF file in a new tab or window instead of downloading it (using asp.net)?

you can return a FileResult from your MVC action.

*********************MVC action************

    public FileResult OpenPDF(parameters)
    {
       //code to fetch your pdf byte array
       return File(pdfBytes, "application/pdf");
    }

**************js**************

Use formpost to post your data to action

    var inputTag = '<input name="paramName" type="text" value="' + payloadString + '">';
    var form = document.createElement("form");
    jQuery(form).attr("id", "pdf-form").attr("name", "pdf-form").attr("class", "pdf-form").attr("target", "_blank");
    jQuery(form).attr("action", "/Controller/OpenPDF").attr("method", "post").attr("enctype", "multipart/form-data");
    jQuery(form).append(inputTag);
    document.body.appendChild(form);
    form.submit();
    document.body.removeChild(form);
    return false;

You need to create a form to post your data, append it your dom, post your data and remove the form your document body.

However, form post wouldn't post data to new tab only on EDGE browser. But a get request works as it's just opening new tab with a url containing query string for your action parameters.

How to use vim in the terminal?

Get started quickly

You simply type vim into the terminal to open it and start a new file.

You can pass a filename as an option and it will open that file, e.g. vim main.c. You can open multiple files by passing multiple file arguments.

Vim has different modes, unlike most editors you have probably used. You begin in NORMAL mode, which is where you will spend most of your time once you become familiar with vim.

To return to NORMAL mode after changing to a different mode, press Esc. It's a good idea to map your Caps Lock key to Esc, as it's closer and nobody really uses the Caps Lock key.

The first mode to try is INSERT mode, which is entered with a for append after cursor, or i for insert before cursor.

To enter VISUAL mode, where you can select text, use v. There are many other variants of this mode, which you will discover as you learn more about vim.

To save your file, ensure you're in NORMAL mode and then enter the command :w. When you press :, you will see your command appear in the bottom status bar. To save and exit, use :x. To quit without saving, use :q. If you had made a change you wanted to discard, use :q!.

Configure vim to your liking

You can edit your ~/.vimrc file to configure vim to your liking. It's best to look at a few first (here's mine) and then decide which options suits your style.

This is how mine looks:

To get the file explorer on the left, use NERDTree. For the status bar, use vim-airline. Finally, the color scheme is solarized.

Further learning

You can use man vim for some help inside the terminal. Alternatively, run vimtutor which is a good hands-on starting point.

It's a good idea to print out a Vim Cheatsheet and keep it in front of you while you're learning vim.

Good luck!

How do I make the scrollbar on a div only visible when necessary?

try this:

<div style='overflow:auto; width:400px;height:400px;'>here is some text</div>

Maximum size for a SQL Server Query? IN clause? Is there a Better Approach

The SQL Server Maximums are disclosed http://msdn.microsoft.com/en-us/library/ms143432.aspx (this is the 2008 version)

A SQL Query can be a varchar(max) but is shown as limited to 65,536 * Network Packet size, but even then what is most likely to trip you up is the 2100 parameters per query. If SQL chooses to parameterize the literal values in the in clause, I would think you would hit that limit first, but I havn't tested it.

Edit : Test it, even under forced parameteriztion it survived - I knocked up a quick test and had it executing with 30k items within the In clause. (SQL Server 2005)

At 100k items, it took some time then dropped with:

Msg 8623, Level 16, State 1, Line 1 The query processor ran out of internal resources and could not produce a query plan. This is a rare event and only expected for extremely complex queries or queries that reference a very large number of tables or partitions. Please simplify the query. If you believe you have received this message in error, contact Customer Support Services for more information.

So 30k is possible, but just because you can do it - does not mean you should :)

Edit : Continued due to additional question.

50k worked, but 60k dropped out, so somewhere in there on my test rig btw.

In terms of how to do that join of the values without using a large in clause, personally I would create a temp table, insert the values into that temp table, index it and then use it in a join, giving it the best opportunities to optimse the joins. (Generating the index on the temp table will create stats for it, which will help the optimiser as a general rule, although 1000 GUIDs will not exactly find stats too useful.)

How to do select from where x is equal to multiple values?

You can try using parentheses around the OR expressions to make sure your query is interpreted correctly, or more concisely, use IN:

SELECT ads.*, location.county 
FROM ads
LEFT JOIN location ON location.county = ads.county_id
WHERE ads.published = 1 
AND ads.type = 13
AND ads.county_id IN (2,5,7,9)

How to get mouse position in jQuery without mouse-events?

I used this method:

$(document).mousemove(function(e) {
    window.x = e.pageX;
    window.y = e.pageY;
});

function show_popup(str) {
    $("#popup_content").html(str);
    $("#popup").fadeIn("fast");
    $("#popup").css("top", y);
    $("#popup").css("left", x);
}

In this way I'll always have the distance from the top saved in y and the distance from the left saved in x.

How to check if a value exists in a dictionary (python)

Use dictionary views:

if x in d.viewvalues():
    dosomething()..

How to resolve Error : Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation

You can't show dialog box ON SERVER from ASP.NET application, well of course tehnically you can do that but it makes no sense since your user is using browser and it can't see messages raised on server. You have to understand how web sites work, server side code (ASP.NET in your case) produces html, javascript etc on server and then browser loads that content and displays it to the user, so in order to present modal message box to the user you have to use Javascript, for example alert function.

Here is the example for asp.net :

https://www.madskristensen.net/blog/javascript-alertshow(e2809dmessagee2809d)-from-aspnet-code-behind/

Mysql 1050 Error "Table already exists" when in fact, it does not

gosh, i had the same problem with osCommerce install script until i figured out the mysql system has many databases and the create table query copies itself into each one and thus droping only the working table on active db didnt help, i had to drop the table from all dbs

Making an svg image object clickable with onclick, avoiding absolute positioning

When embedding same-origin SVGs using <object>, you can access the internal contents using objectElement.contentDocument.rootElement. From there, you can easily attach event handlers (e.g. via onclick, addEventListener(), etc.)

For example:

var object = /* get DOM node for <object> */;
var svg = object.contentDocument.rootElement;
svg.addEventListener('click', function() {
  console.log('hooray!');
});

Note that this is not possible for cross-origin <object> elements unless you also control the <object> origin server and can set CORS headers there. For cross-origin cases without CORS headers, access to contentDocument is blocked.

How can I mimic the bottom sheet from the Maps app?

I don't know how exactly the bottom sheet of the new Maps app, responds to user interactions. But you can create a custom view that looks like the one in the screenshots and add it to the main view.

I assume you know how to:

1- create view controllers either by storyboards or using xib files.

2- use googleMaps or Apple's MapKit.

Example

1- Create 2 view controllers e.g, MapViewController and BottomSheetViewController. The first controller will host the map and the second is the bottom sheet itself.

Configure MapViewController

Create a method to add the bottom sheet view.

func addBottomSheetView() {
    // 1- Init bottomSheetVC
    let bottomSheetVC = BottomSheetViewController()

    // 2- Add bottomSheetVC as a child view 
    self.addChildViewController(bottomSheetVC)
    self.view.addSubview(bottomSheetVC.view)
    bottomSheetVC.didMoveToParentViewController(self)

    // 3- Adjust bottomSheet frame and initial position.
    let height = view.frame.height
    let width  = view.frame.width
    bottomSheetVC.view.frame = CGRectMake(0, self.view.frame.maxY, width, height)
}

And call it in viewDidAppear method:

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    addBottomSheetView()
}

Configure BottomSheetViewController

1) Prepare background

Create a method to add blur and vibrancy effects

func prepareBackgroundView(){
    let blurEffect = UIBlurEffect.init(style: .Dark)
    let visualEffect = UIVisualEffectView.init(effect: blurEffect)
    let bluredView = UIVisualEffectView.init(effect: blurEffect)
    bluredView.contentView.addSubview(visualEffect)

    visualEffect.frame = UIScreen.mainScreen().bounds
    bluredView.frame = UIScreen.mainScreen().bounds

    view.insertSubview(bluredView, atIndex: 0)
}

call this method in your viewWillAppear

override func viewWillAppear(animated: Bool) {
   super.viewWillAppear(animated)
   prepareBackgroundView()
}

Make sure that your controller's view background color is clearColor.

2) Animate bottomSheet appearance

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    UIView.animateWithDuration(0.3) { [weak self] in
        let frame = self?.view.frame
        let yComponent = UIScreen.mainScreen().bounds.height - 200
        self?.view.frame = CGRectMake(0, yComponent, frame!.width, frame!.height)
    }
}

3) Modify your xib as you want.

4) Add Pan Gesture Recognizer to your view.

In your viewDidLoad method add UIPanGestureRecognizer.

override func viewDidLoad() {
    super.viewDidLoad()

    let gesture = UIPanGestureRecognizer.init(target: self, action: #selector(BottomSheetViewController.panGesture))
    view.addGestureRecognizer(gesture)

}

And implement your gesture behaviour:

func panGesture(recognizer: UIPanGestureRecognizer) {
    let translation = recognizer.translationInView(self.view)
    let y = self.view.frame.minY
    self.view.frame = CGRectMake(0, y + translation.y, view.frame.width, view.frame.height)
     recognizer.setTranslation(CGPointZero, inView: self.view)
}

Scrollable Bottom Sheet:

If your custom view is a scroll view or any other view that inherits from, so you have two options:

First:

Design the view with a header view and add the panGesture to the header. (bad user experience).

Second:

1 - Add the panGesture to the bottom sheet view.

2 - Implement the UIGestureRecognizerDelegate and set the panGesture delegate to the controller.

3- Implement shouldRecognizeSimultaneouslyWith delegate function and disable the scrollView isScrollEnabled property in two case:

The view is partially visible.
The view is totally visible, the scrollView contentOffset property is 0 and the user is dragging the view downwards.

Otherwise enable scrolling.

  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
      let gesture = (gestureRecognizer as! UIPanGestureRecognizer)
      let direction = gesture.velocity(in: view).y

      let y = view.frame.minY
      if (y == fullView && tableView.contentOffset.y == 0 && direction > 0) || (y == partialView) {
          tableView.isScrollEnabled = false
      } else {
        tableView.isScrollEnabled = true
      }

      return false
  }

NOTE

In case you set .allowUserInteraction as an animation option, like in the sample project, so you need to enable scrolling on the animation completion closure if the user is scrolling up.

Sample Project

I created a sample project with more options on this repo which may give you better insights about how to customise the flow.

In the demo, addBottomSheetView() function controls which view should be used as a bottom sheet.

Sample Project Screenshots

- Partial View

- FullView

- Scrollable View

show dbs gives "Not Authorized to execute command" error

one more, after you create user by following cmd-1, please assign read/write/root role to the user by cmd-2. then restart mongodb by cmd "mongod --auth".

The benefit of assign role to the user is you can do read/write operation by mongo shell or python/java and so on, otherwise you will meet "pymongo.errors.OperationFailure: not authorized" when you try to read/write your db.

cmd-1:

use admin
db.createUser({
  user: "newUsername",
  pwd: "password",
  roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
})

cmd-2:

db.grantRolesToUser('newUsername',[{ role: "root", db: "admin" }])

Java SimpleDateFormat for time zone with a colon separator?

tl;dr

OffsetDateTime.parse( "2010-03-01T00:00:00-08:00" )

Details

The answer by BalusC is correct, but now outdated as of Java 8.

java.time

The java.time framework is the successor to both Joda-Time library and the old troublesome date-time classes bundled with the earliest versions of Java (java.util.Date/.Calendar & java.text.SimpleDateFormat).

ISO 8601

Your input data string happens to comply with the ISO 8601 standard.

The java.time classes use ISO 8601 formats by default when parsing/generating textual representations of date-time values. So no need to define a formatting pattern.

`OffsetDateTime`

The OffsetDateTime class represents a moment on the time line adjusted to some particular offset-from-UTC. In your input, the offset is 8 hours behind UTC, commonly used on much of the west coast of North America.

OffsetDateTime odt = OffsetDateTime.parse( "2010-03-01T00:00:00-08:00" );

You seem to want the date-only, in which case use the LocalDate class. But keep in mind you are discarding data, (a) time-of-day, and (b) the time zone. Really, a date has no meaning without the context of a time zone. For any given moment the date varies around the world. For example, just after midnight in Paris is still “yesterday” in Montréal. So while I suggest sticking with date-time values, you can easily convert to a LocalDate if you insist.

LocalDate localDate = odt.toLocalDate();

Time Zone

If you know the intended time zone, apply it. A time zone is an offset plus the rules to use for handling anomalies such as Daylight Saving Time (DST). Applying a ZoneId gets us a ZonedDateTime object.

ZoneId zoneId = ZoneId.of( "America/Los_Angeles" );
ZonedDateTime zdt = odt.atZoneSameInstant( zoneId );

Generating strings

To generate a string in ISO 8601 format, call toString.

String output = odt.toString();

If you need strings in other formats, search Stack Overflow for use of the java.util.format package.

Converting to `java.util.Date`

Best to avoid java.util.Date, but if you must, you can convert. Call the new methods added to the old classes such as java.util.Date.from where you pass an Instant. An Instant is a moment on the timeline in UTC. We can extract an Instant from our OffsetDateTime.

java.util.Date utilDate = java.util.Date( odt.toInstant() );

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

Where to obtain the java.time classes?

Java SE 8, Java SE 9, Java SE 10, and later
- Built-in.
- Part of the standard Java API with a bundled implementation.
- Java 9 adds some minor features and fixes.
Java SE 6 and Java SE 7
- Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
- Later versions of Android bundle implementations of the java.time classes.
- For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP….

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

How to install Android Studio on Ubuntu?

Don't forget to run:

/opt/android-studio/bin/studio.sh

when you are done installing.

Convert XML String to Object

You can use xsd.exe to create schema bound classes in .Net then XmlSerializer to Deserialize the string : http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer.deserialize.aspx

Take a full page screenshot with Firefox on the command-line

I ended up coding a custom solution (Firefox extension) that does this. I think by the time I developed it, the commandline mentioned in enreas wasn't there.

The Firefox extension is CmdShots. It's a good option if you need finer degree of control over the process of taking the screenshot (or you want to do some HTML/JS modifications and image processing).

You can use it and abuse it. I decided to keep it unlicensed, so you are free to play with it as you want.

How can I debug git/git-shell related problems?

Debugging

Git has a fairly complete set of traces embedded which you can use to debug your git problems.

To turn them on, you can define the following variables:

GIT_TRACE for general traces,
GIT_TRACE_PACK_ACCESS for tracing of packfile access,
GIT_TRACE_PACKET for packet-level tracing for network operations,
GIT_TRACE_PERFORMANCE for logging the performance data,
GIT_TRACE_SETUP for information about discovering the repository and environment it’s interacting with,
GIT_MERGE_VERBOSITY for debugging recursive merge strategy (values: 0-5),
GIT_CURL_VERBOSE for logging all curl messages (equivalent to curl -v),
GIT_TRACE_SHALLOW for debugging fetching/cloning of shallow repositories.

Possible values can include:

true, 1 or 2 to write to stderr,
an absolute path starting with / to trace output to the specified file.

For more details, see: Git Internals - Environment Variables

SSH

For SSH issues, try the following commands:

echo 'ssh -vvv "$*"' > ssh && chmod +x ssh
GIT_SSH="$PWD/ssh" git pull origin master

or use ssh to validate your credentials, e.g.

ssh -vvvT [email protected]

or over HTTPS port:

ssh -vvvT -p 443 [email protected]

^{Note: Reduce number of -v to reduce the verbosity level.}

Examples

$ GIT_TRACE=1 git status
20:11:39.565701 git.c:350               trace: built-in: git 'status'

$ GIT_TRACE_PERFORMANCE=$PWD/gc.log git gc
Counting objects: 143760, done.
...
$ head gc.log 
20:12:37.214410 trace.c:420             performance: 0.090286000 s: git command: 'git' 'pack-refs' '--all' '--prune'
20:12:37.378101 trace.c:420             performance: 0.156971000 s: git command: 'git' 'reflog' 'expire' '--all'
...

$ GIT_TRACE_PACKET=true git pull origin master
20:16:53.062183 pkt-line.c:80           packet:        fetch< 93eb028c6b2f8b1d694d1173a4ddf32b48e371ce HEAD\0multi_ack thin-pack side-band side-band-64k ofs-delta shallow no-progress include-tag multi_ack_detailed symref=HEAD:refs/heads/master agent=git/2:2.6.5~update-ref-initial-update-1494-g76b680d
...

Access mysql remote database from command line

simply put this on terminal at ubuntu:

mysql -u username -h host -p

Now hit enter

terminal will ask you password, enter the password and you are into database server

How to pass objects to functions in C++?

There are three methods of passing an object to a function as a parameter:

Pass by reference
pass by value
adding constant in parameter

Go through the following example:

class Sample
{
public:
    int *ptr;
    int mVar;

    Sample(int i)
    {
        mVar = 4;
        ptr = new int(i);
    }

    ~Sample()
    {
        delete ptr;
    }

    void PrintVal()
    {
        cout << "The value of the pointer is " << *ptr << endl
             << "The value of the variable is " << mVar;
   }
};

void SomeFunc(Sample x)
{
cout << "Say i am in someFunc " << endl;
}


int main()
{

  Sample s1= 10;
  SomeFunc(s1);
  s1.PrintVal();
  char ch;
  cin >> ch;
}

Output:

Say i am in someFunc
The value of the pointer is -17891602
The value of the variable is 4

Generating a random hex color code with PHP

An RGB hex string is just a number from 0x0 through 0xFFFFFF, so simply generate a number in that range and convert it to hexadecimal:

function rand_color() {
    return '#' . str_pad(dechex(mt_rand(0, 0xFFFFFF)), 6, '0', STR_PAD_LEFT);
}

or:

function rand_color() {
    return sprintf('#%06X', mt_rand(0, 0xFFFFFF));
}

How To Change DataType of a DataColumn in a DataTable?

DataTable DT = ...
// Rename column to OLD:
DT.Columns["ID"].ColumnName = "ID_OLD";
// Add column with new type:
DT.Columns.Add( "ID", typeof(int) );
// copy data from old column to new column with new type:
foreach( DataRow DR in DT.Rows )
{ DR["ID"] = Convert.ToInt32( DR["ID_OLD"] ); }
// remove "OLD" column
DT.Columns.Remove( "ID_OLD" );

How to change Navigation Bar color in iOS 7?

If you want to use a hex code, here is the best way to do so.

First, define this at the top of your class:

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

Then inside the "application didFinishLaunchingWithOptions", put this:

[[UINavigationBar appearance] setBarTintColor:UIColorFromRGB(0x00b0f0)];

Put you hex code in place of the 00b0f0.

Make a dictionary with duplicate keys in Python

You can't have duplicated keys in a dictionary. Use a dict of lists:

for line in data_list:
  regNumber = line[0]
  name = line[1]
  phoneExtn = line[2]
  carpark = line[3].strip()
  details = (name,phoneExtn,carpark)
  if not data_dict.has_key(regNumber):
    data_dict[regNumber] = [details]
  else:
    data_dict[regNumber].append(details)

PreparedStatement IN clause alternatives?

No simple way AFAIK. If the target is to keep statement cache ratio high (i.e to not create a statement per every parameter count), you may do the following:

create a statement with a few (e.g. 10) parameters:

... WHERE A IN (?,?,?,?,?,?,?,?,?,?) ...
Bind all actuall parameters

setString(1,"foo"); setString(2,"bar");
Bind the rest as NULL

setNull(3,Types.VARCHAR) ... setNull(10,Types.VARCHAR)

NULL never matches anything, so it gets optimized out by the SQL plan builder.

The logic is easy to automate when you pass a List into a DAO function:

while( i < param.size() ) {
  ps.setString(i+1,param.get(i));
  i++;
}

while( i < MAX_PARAMS ) {
  ps.setNull(i+1,Types.VARCHAR);
  i++;
}

SQL Server Operating system error 5: "5(Access is denied.)"

The problem is due to lack of permissions for SQL Server to access the mdf & ldf files. All these procedures will work :

you can directly change the MSSQLSERVER service startup user account, with the user account who have better privileges on the files. Then try to attach the database.
Or you can assign the user to the file in security tab of the mdf & ldf files properties with read and and write privileges checked.
Startup with windows administrator account, and open SQL Server with run as administrator option and try to login with windows authentication and now try to attach the database.

What is the best way to iterate over a dictionary?

In some cases you may need a counter that may be provided by for-loop implementation. For that, LINQ provides ElementAt which enables the following:

for (int index = 0; index < dictionary.Count; index++) {
  var item = dictionary.ElementAt(index);
  var itemKey = item.Key;
  var itemValue = item.Value;
}

Padding between ActionBar's home icon and title

For my case, it was with Toolbar i resolved it like this:

ic_toolbar_drawble.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
    android:drawable="@drawable/ic_toolbar"
    android:right="-16dp"
    android:left="-16dp"/>
</layer-list>

In my Fragment, i check the api :

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
      toolbar.setLogo(R.drawable.ic_toolbar);
else
      toolbar.setLogo(R.drawable.ic_toolbar_draweble);

Good luck!

Bootstrap 3 - Set Container Width to 940px Maximum for Desktops?

If you don't wish to compile bootstrap, copy the following and insert it in your custom css file. It's not recommended to change the original bootstrap css file. Also, you won't be able to modify the bootstrap original css if you are loading it from a cdn.

Paste this in your custom css file:

@media (min-width:992px)
    {
        .container{width:960px}
    }
@media (min-width:1200px)
    {
        .container{width:960px}
    }

I am here setting my container to 960px for anything that can accommodate it, and keeping the rest media sizes to default values. You can set it to 940px for this problem.

Build query string for System.Net.HttpClient get

To avoid double encoding issue described in taras.roshko's answer and to keep possibility to easily work with query parameters, you can use uriBuilder.Uri.ParseQueryString() instead of HttpUtility.ParseQueryString().

using scp in terminal

I would open another terminal on your laptop and do the scp from there, since you already know how to set that connection up.

scp username@remotecomputer:/path/to/file/you/want/to/copy where/to/put/file/on/laptop

The username@remotecomputer is the same string you used with ssh initially.

Length of the String without using length() method

try below code

    public static int Length(String str) {
    str = str + '\0';
    int count = 0;

    for (int i = 0; str.charAt(i) != '\0'; i++) {
        count++;
    }

    return count;
    }

Console output in a Qt GUI app?

Easy

Step1: Create new project. Go File->New File or Project --> Other Project -->Empty Project

Step2: Use the below code.

In .pro file

QT +=widgets
CONFIG += console
TARGET = minimal
SOURCES += \ main.cpp

Step3: Create main.cpp and copy the below code.

#include <QApplication>
#include <QtCore>

using namespace  std;

QTextStream in(stdin);
QTextStream out(stdout);

int main(int argc, char *argv[]){
QApplication app(argc,argv);
qDebug() << "Please enter some text over here: " << endl;
out.flush();
QString input;
input = in.readLine();
out << "The input is " << input  << endl;
return app.exec();
}

I created necessary objects in the code for your understanding.

Just Run It

If you want your program to get multiple inputs with some conditions. Then past the below code in Main.cpp

#include <QApplication>
#include <QtCore>

using namespace  std;

QTextStream in(stdin);
QTextStream out(stdout);

int main(int argc, char *argv[]){
    QApplication app(argc,argv);
    qDebug() << "Please enter some text over here: " << endl;
    out.flush();
    QString input;
    do{
        input = in.readLine();
        if(input.size()==6){
            out << "The input is " << input  << endl;   
        }
        else
        {
            qDebug("Not the exact input man");
        }
    }while(!input.size()==0);

    qDebug(" WE ARE AT THE END");

    // endif
    return app.exec();
} // end main

Hope it educates you.

Good day,

Java function for arrays like PHP's join()?

A similar alternative

/**
 * @param delimiter 
 * @param inStr
 * @return String
 */
public static String join(String delimiter, String... inStr)
{
    StringBuilder sb = new StringBuilder();
    if (inStr.length > 0)
    {
        sb.append(inStr[0]);
        for (int i = 1; i < inStr.length; i++)
        {
            sb.append(delimiter);                   
            sb.append(inStr[i]);
        }
    }
    return sb.toString();
}

Error Running React Native App From Terminal (iOS)

I had to accept the XCode license after my first install before I could run it. You can run the following to get the license prompt via command line. You have to type agree and confirm as well.

sudo xcodebuild -license

C#, Looping through dataset and show each record from a dataset column

foreach (DataRow dr in ds.Tables[0].Rows)
{
    //your code here
}

What is the difference between children and childNodes in JavaScript?

Good answers so far, I want to only add that you could check the type of a node using nodeType:

yourElement.nodeType

This will give you an integer: (taken from here)

| Value |             Constant             |                          Description                          |  |
|-------|----------------------------------|---------------------------------------------------------------|--|
|    1  | Node.ELEMENT_NODE                | An Element node such as <p> or <div>.                         |  |
|    2  | Node.ATTRIBUTE_NODE              | An Attribute of an Element. The element attributes            |  |
|       |                                  | are no longer implementing the Node interface in              |  |
|       |                                  | DOM4 specification.                                           |  |
|    3  | Node.TEXT_NODE                   | The actual Text of Element or Attr.                           |  |
|    4  | Node.CDATA_SECTION_NODE          | A CDATASection.                                               |  |
|    5  | Node.ENTITY_REFERENCE_NODE       | An XML Entity Reference node. Removed in DOM4 specification.  |  |
|    6  | Node.ENTITY_NODE                 | An XML <!ENTITY ...> node. Removed in DOM4 specification.     |  |
|    7  | Node.PROCESSING_INSTRUCTION_NODE | A ProcessingInstruction of an XML document                    |  |
|       |                                  | such as <?xml-stylesheet ... ?> declaration.                  |  |
|    8  | Node.COMMENT_NODE                | A Comment node.                                               |  |
|    9  | Node.DOCUMENT_NODE               | A Document node.                                              |  |
|   10  | Node.DOCUMENT_TYPE_NODE          | A DocumentType node e.g. <!DOCTYPE html> for HTML5 documents. |  |
|   11  | Node.DOCUMENT_FRAGMENT_NODE      | A DocumentFragment node.                                      |  |
|   12  | Node.NOTATION_NODE               | An XML <!NOTATION ...> node. Removed in DOM4 specification.   |  |

Note that according to Mozilla:

The following constants have been deprecated and should not be used anymore: Node.ATTRIBUTE_NODE, Node.ENTITY_REFERENCE_NODE, Node.ENTITY_NODE, Node.NOTATION_NODE

Moving up one directory in Python

>>> import os
>>> print os.path.abspath(os.curdir)
C:\Python27
>>> os.chdir("..")
>>> print os.path.abspath(os.curdir)
C:\

How to enable scrolling on website that disabled scrolling?

adding overflow:visible !important; to the body element worked for me.

How to check that an element is in a std::set?

In C++20 we'll finally get std::set::contains method.

#include <iostream>
#include <string>
#include <set>

int main()
{
    std::set<std::string> example = {"Do", "not", "panic", "!!!"};

    if(example.contains("panic")) {
        std::cout << "Found\n";
    } else {
        std::cout << "Not found\n";
    }
}

PHP check if date between two dates

Use directly

$paymentDate = strtotime(date("d-m-Y"));
$contractDateBegin = strtotime("01-01-2001");
$contractDateEnd = strtotime("01-01-2015");

Then comparison will be ok cause your 01-01-2015 is valid for PHP's 32bit date-range, stated in strtotime's manual.

Is it possible to animate scrollTop with jQuery?

Nick's answer works great. Be careful when specifying a complete() function inside the animate() call because it will get executed twice since you have two selectors declared (html and body).

$("html, body").animate(
    { scrollTop: "300px" },
    {
        complete : function(){
            alert('this alert will popup twice');
        }
    }
);

Here's how you can avoid the double callback.

var completeCalled = false;
$("html, body").animate(
    { scrollTop: "300px" },
    {
        complete : function(){
            if(!completeCalled){
                completeCalled = true;
                alert('this alert will popup once');
            }
        }
    }
);

Open Url in default web browser

A simpler way which eliminates checking if the app can open the url.

  loadInBrowser = () => {
    Linking.openURL(this.state.url).catch(err => console.error("Couldn't load page", err));
  };

Calling it with a button.

<Button title="Open in Browser" onPress={this.loadInBrowser} />

How to reset Android Studio

We can no longer reset android studio to it's default state by the answers/methods given in this question from android studio 3.2.0 Here is the updated new method to do it (It consumes less time as it does not require any update/installation).

For Windows/Mac

Open my computer
Go to C:\Users\Username\.android\build-cache
Delete the cache/files found inside the folder build-cache
Note: do not delete the folder named as "3.2.0" and "3.2.1" which will be inside the build-cache
Restart Android studio.

and that would completely reset your android studio settings from Android studio 3.2.0 and up.

Enable CORS in fetch api

Browser have cross domain security at client side which verify that server allowed to fetch data from your domain. If Access-Control-Allow-Origin not available in response header, browser disallow to use response in your JavaScript code and throw exception at network level. You need to configure cors at your server side.

You can fetch request using mode: 'cors'. In this situation browser will not throw execption for cross domain, but browser will not give response in your javascript function.

So in both condition you need to configure cors in your server or you need to use custom proxy server.

What's the u prefix in a Python string?

The u in u'Some String' means that your string is a Unicode string.

Q: I'm in a terrible, awful hurry and I landed here from Google Search. I'm trying to write this data to a file, I'm getting an error, and I need the dead simplest, probably flawed, solution this second.

A: You should really read Joel's Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) essay on character sets.

Q: sry no time code pls

A: Fine. try str('Some String') or 'Some String'.encode('ascii', 'ignore'). But you should really read some of the answers and discussion on Converting a Unicode string and this excellent, excellent, primer on character encoding.

Setting the Textbox read only property to true using JavaScript

document.getElementById('textbox-id').readOnly=true should work

How do you divide each element in a list by an int?

>>> myList = [10,20,30,40,50,60,70,80,90]
>>> myInt = 10
>>> newList = map(lambda x: x/myInt, myList)
>>> newList
[1, 2, 3, 4, 5, 6, 7, 8, 9]

how to set the query timeout from SQL connection string

You can only set the connection timeout on the connection string, the timeout for your query would normally be on the command timeout. (Assuming we are talking .net here, I can't really tell from your question).

However the command timeout has no effect when the command is executed against a context connection (a SqlConnection opened with "context connection=true" in the connection string).

Programmatic equivalent of default(Type)

I do the same task like this.

//in MessageHeader 
   private void SetValuesDefault()
   {
        MessageHeader header = this;             
        Framework.ObjectPropertyHelper.SetPropertiesToDefault<MessageHeader>(this);
   }

//in ObjectPropertyHelper
   public static void SetPropertiesToDefault<T>(T obj) 
   {
            Type objectType = typeof(T);

            System.Reflection.PropertyInfo [] props = objectType.GetProperties();

            foreach (System.Reflection.PropertyInfo property in props)
            {
                if (property.CanWrite)
                {
                    string propertyName = property.Name;
                    Type propertyType = property.PropertyType;

                    object value = TypeHelper.DefaultForType(propertyType);
                    property.SetValue(obj, value, null);
                }
            }
    }

//in TypeHelper
    public static object DefaultForType(Type targetType)
    {
        return targetType.IsValueType ? Activator.CreateInstance(targetType) : null;
    }

How to copy directories with spaces in the name

robocopy "C:\Users\Angie\My Documents" "C:\test-backup\My Documents" /B /E /R:0 /CREATE /NP /TEE /XJ /LOG+:"CompleteBackupLog.txt"
robocopy "C:\Users\Angie\My Music" "C:\test-backup\My Music" /B /E /R:0 /CREATE /NP /TEE /XJ /LOG+:"CompleteBackupLog.txt"
robocopy "C:\Users\Angie\My Pictures" "C:\test-backup\My Pictures" /B /E /R:0 /CREATE /NP /TEE /XJ /LOG+:"CompleteBackupLog.txt"

How to convert a String into an ArrayList?

I recommend use the StringTokenizer, is very efficient

     List<String> list = new ArrayList<>();

     StringTokenizer token = new StringTokenizer(value, LIST_SEPARATOR);
     while (token.hasMoreTokens()) {
           list.add(token.nextToken());
     }

Display open transactions in MySQL

Although there won't be any remaining transaction in the case, as @Johan said, you can see the current transaction list in InnoDB with the query below if you want.

SELECT * FROM information_schema.innodb_trx\G

From the document:

The INNODB_TRX table contains information about every transaction (excluding read-only transactions) currently executing inside InnoDB, including whether the transaction is waiting for a lock, when the transaction started, and the SQL statement the transaction is executing, if any.

Can't install gems on OS X "El Capitan"

As it have been said, the issue comes from a security function of Mac OSX since "El Capitan".

Using the default system Ruby, the install process happens in the /Library/Ruby/Gems/2.0.0 directory which is not available to the user and gives the error.

You can have a look to your Ruby environments parameters with the command

$ gem env

There is an INSTALLATION DIRECTORY and a USER INSTALLATION DIRECTORY. To use the user installation directory instead of the default installation directory, you can use --user-install parameter instead as using sudo which is never a recommanded way of doing.

$ gem install myGemName --user-install

There should not be any rights issue anymore in the process. The gems are then installed in the user directory : ~/.gem/Ruby/2.0.0/bin

But to make the installed gems available, this directory should be available in your path. According to the Ruby’s faq, you can add the following line to your ~/.bash_profile or ~/.bashrc

if which ruby >/dev/null && which gem >/dev/null; then
    PATH="$(ruby -rubygems -e 'puts Gem.user_dir')/bin:$PATH"
fi

Then close and reload your terminal or reload your .bash_profile or .bashrc (. ~/.bash_profile)

Double quotes within php script echo

You can just forgo the quotes for alphanumeric attributes:

echo "<font color=red> XHTML is not a thing anymore. </font>";
echo "<div class=editorial-note> There, I said it. </div>";

Is perfectly valid in HTML, and though still shunned, absolutely en vogue since HTML5.

CAVEATS

It's only valid for mostly alphanumeric and dash combinations.
Never ever do this with user input appended to attributes (those need quoting and htmlspecialchars or some whitelisting).
See also: When the attribute value can remain unquoted in HTML5
In other news: <font> specifically is somewhat outdated however.

How to remove all ListBox items?

while (listBox1.Items.Count > 0){ 
    listBox1.Items.Remove(0);
}

Where are logs located?

Ensure debug mode is on - either add APP_DEBUG=true to .env file or set an environment variable
Log files are in storage/logs folder. laravel.log is the default filename. If there is a permission issue with the log folder, Laravel just halts. So if your endpoint generally works - permissions are not an issue.
In case your calls don't even reach Laravel or aren't caused by code issues - check web server's log files (check your Apache/nginx config files to see the paths).
If you use PHP-FPM, check its log files as well (you can see the path to log file in PHP-FPM pool config).

Javascript format date / time

I don't think that can be done RELIABLY with built in methods on the native Date object. The toLocaleString method gets close, but if I am remembering correctly, it won't work correctly in IE < 10. If you are able to use a library for this task, MomentJS is a really amazing library; and it makes working with dates and times easy. Otherwise, I think you will have to write a basic function to give you the format that you are after.

function formatDate(date) {
    var year = date.getFullYear(),
        month = date.getMonth() + 1, // months are zero indexed
        day = date.getDate(),
        hour = date.getHours(),
        minute = date.getMinutes(),
        second = date.getSeconds(),
        hourFormatted = hour % 12 || 12, // hour returned in 24 hour format
        minuteFormatted = minute < 10 ? "0" + minute : minute,
        morning = hour < 12 ? "am" : "pm";

    return month + "/" + day + "/" + year + " " + hourFormatted + ":" +
            minuteFormatted + morning;
}

How to use localization in C#

Great answer by F.Mörk. But if you want to update translation, or add new languages once the application is released, you're stuck, because you always have to recompile it to generate the resources.dll.

Here is a solution to manually compile a resource dll. It uses the resgen.exe and al.exe tools (installed with the sdk).

Say you have a Strings.fr.resx resource file, you can compile a resources dll with the following batch:

resgen.exe /compile Strings.fr.resx,WpfRibbonApplication1.Strings.fr.resources 
Al.exe /t:lib /embed:WpfRibbonApplication1.Strings.fr.resources /culture:"fr" /out:"WpfRibbonApplication1.resources.dll"
del WpfRibbonApplication1.Strings.fr.resources
pause

Be sure to keep the original namespace in the file names (here "WpfRibbonApplication1")

org.hibernate.PersistentObjectException: detached entity passed to persist

You didn't provide many relevant details so I will guess that you called getInvoice and then you used result object to set some values and call save with assumption that your object changes will be saved.

However, persist operation is intended for brand new transient objects and it fails if id is already assigned. In your case you probably want to call saveOrUpdate instead of persist.

You can find some discussion and references here "detached entity passed to persist error" with JPA/EJB code

Regex pattern inside SQL Replace function?

Instead of stripping out the found character by its sole position, using Replace(Column, BadFoundCharacter, '') could be substantially faster. Additionally, instead of just replacing the one bad character found next in each column, this replaces all those found.

WHILE 1 = 1 BEGIN
    UPDATE dbo.YourTable
    SET Column = Replace(Column, Substring(Column, PatIndex('%[^0-9.-]%', Column), 1), '')
    WHERE Column LIKE '%[^0-9.-]%'
    If @@RowCount = 0 BREAK;
END;

I am convinced this will work better than the accepted answer, if only because it does fewer operations. There are other ways that might also be faster, but I don't have time to explore those right now.

php exec() is not executing the command

You might also try giving the full path to the binary you're trying to run. That solved my problem when trying to use ImageMagick.

How to get value in the session in jQuery

Sessions are stored on the server and are set from server side code, not client side code such as JavaScript.

What you want is a cookie, someone's given a brilliant explanation in this Stack Overflow question here: How do I set/unset cookie with jQuery?

You could potentially use sessions and set/retrieve them with jQuery and AJAX, but it's complete overkill if Cookies will do the trick.

jquery how to empty input field

While submitting form use reset method on form. The reset() method resets the values of all elements in a form.

$('#form-id')[0].reset();

OR 

document.getElementById("form-id").reset();

https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/reset

_x000D_

$("#submit-button").on("click", function(){_x000D_
       //code here_x000D_
       $('#form-id')[0].reset();_x000D_
});

_x000D_

<html>_x000D_
<head>_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>_x000D_
</head>_x000D_
<body>_x000D_
<form id="form-id">_x000D_
  First name:<br>_x000D_
  <input type="text" name="firstname">_x000D_
  <br>_x000D_
  Last name:<br>_x000D_
  <input type="text" name="lastname">_x000D_
  <br><br>_x000D_
  <input id="submit-button" type="submit" value="Submit">_x000D_
</form> _x000D_
</body>_x000D_
</html>

_x000D_

Jenkins vs Travis-CI. Which one would you use for a Open Source project?

I would suggest Travis for Open source project. It's just simple to configure and use.

Simple steps to setup:

Should have GITHUB account and register in Travis CI website using your GITHUB account.
Add .travis.yml file in root of your project. Add Travis as service in your repository settings page.

Now every time you commit into your repository Travis will build your project. You can follow simple steps to get started with Travis CI.

“Error occurred during initialization of VM; Could not reserve enough space for object heap” using -Xmx3G

How to use View.OnTouchListener instead of onClick

for use sample touch listener just you need this code

@Override
public boolean onTouch(View view, MotionEvent motionEvent) {

    ClipData data = ClipData.newPlainText("", "");
    View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
    view.startDrag(data, shadowBuilder, null, 0);

    return true;
}

C++ - Decimal to binary converting

here a simple converter by using std::string as container. it allows a negative value.

#include <iostream>
#include <string>
#include <limits>

int main()
{
    int x = -14;

    int n = std::numeric_limits<int>::digits - 1;

    std::string s;
    s.reserve(n + 1);

    do
        s.push_back(((x >> n) & 1) + '0');
    while(--n > -1);

    std::cout << s << '\n';
}

Is there a cross-domain iframe height auto-resizer that works?

I got the solution for setting the height of the iframe dynamically based on it's content. This works for the cross domain content. There are some steps to follow to achieve this.

Suppose you have added iframe in "abc.com/page" web page

<div> <iframe id="IframeId" src="http://xyz.pqr/contactpage" style="width:100%;" onload="setIframeHeight(this)"></iframe> </div>
Next you have to bind windows "message" event under web page "abc.com/page"

window.addEventListener('message', function (event) {
//Here We have to check content of the message event  for safety purpose
//event data contains message sent from page added in iframe as shown in step 3
if (event.data.hasOwnProperty("FrameHeight")) {
        //Set height of the Iframe
        $("#IframeId").css("height", event.data.FrameHeight);        
    }
});

On iframe load you have to send message to iframe window content with "FrameHeight" message:

function setIframeHeight(ifrm) {
   var height = ifrm.contentWindow.postMessage("FrameHeight", "*");   
}

On main page that added under iframe here "xyz.pqr/contactpage" you have to bind windows "message" event where all messages are going to receive from parent window of "abc.com/page"

window.addEventListener('message', function (event) {

    // Need to check for safety as we are going to process only our messages
    // So Check whether event with data(which contains any object) contains our message here its "FrameHeight"
   if (event.data == "FrameHeight") {

        //event.source contains parent page window object 
        //which we are going to use to send message back to main page here "abc.com/page"

        //parentSourceWindow = event.source;

        //Calculate the maximum height of the page
        var body = document.body, html = document.documentElement;
        var height = Math.max(body.scrollHeight, body.offsetHeight,
            html.clientHeight, html.scrollHeight, html.offsetHeight);

       // Send height back to parent page "abc.com/page"
        event.source.postMessage({ "FrameHeight": height }, "*");       
    }
});

How to get just one file from another branch

To restore a file from another branch, simply use the following command from your working branch:

git restore -s my-other-branch -- ./path/to/file

The -s flag is short for source i.e. the branch from where you want to pull the file.

(The chosen answer is very informative but also a bit overwhelming.)

Java 8 lambdas, Function.identity() or t->t

As of the current JRE implementation, Function.identity() will always return the same instance while each occurrence of identifier -> identifier will not only create its own instance but even have a distinct implementation class. For more details, see here.

The reason is that the compiler generates a synthetic method holding the trivial body of that lambda expression (in the case of x->x, equivalent to return identifier;) and tell the runtime to create an implementation of the functional interface calling this method. So the runtime sees only different target methods and the current implementation does not analyze the methods to find out whether certain methods are equivalent.

So using Function.identity() instead of x -> x might save some memory but that shouldn’t drive your decision if you really think that x -> x is more readable than Function.identity().

You may also consider that when compiling with debug information enabled, the synthetic method will have a line debug attribute pointing to the source code line(s) holding the lambda expression, therefore you have a chance of finding the source of a particular Function instance while debugging. In contrast, when encountering the instance returned by Function.identity() during debugging an operation, you won’t know who has called that method and passed the instance to the operation.

Set the maximum character length of a UITextField in Swift

I use this step, first Set delegate texfield in viewdidload.

    override func viewDidLoad() {
        super.viewDidLoad()

        textfield.delegate = self

    }

and then shouldChangeCharactersIn after you include UITextFieldDelegate.

extension viewController: UITextFieldDelegate {
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
                let newLength = (textField.text?.utf16.count)! + string.utf16.count - range.length
                if newLength <= 8 { 
                    return true
                } else {
                    return false
                }
            }
    }

Why should I use an IDE?

A couple of reasons I can think of for using an IDE:

Integrated help is a favorite.
The built-in Refactor with Preview of the Visual Studio
IntelliSense, syntax hightlighting, ease of navigation for large projects, integrated debugging, etc. (although I know with addins you can probably get a lot of this with Emacs and Vim).
Also, I think IDEs these days have a wider user-base, and probably more people developing add-ins for them, but I might be wrong.

And quite frankly, I like my mouse. When I use pure text-based editors it gets lonely.

Can a main() method of class be invoked from another class in java

yes, but only if main is declared public

Chrome:The website uses HSTS. Network errors...this page will probably work later

I had this issue with sites running on XAMPP with private hostnames. Not so private, it turns out! They were all domain.dev, which Google has now registered as a private gTLD, and is forcing HSTS at the domain level. Changed every virtual host to .devel (eugh), restarted Apache and all is now well.

jquery save json data object in cookie

Try this one: https://github.com/tantau-horia/jquery-SuperCookie

Quick Usage:

create - create cookie

check - check existance

verify - verify cookie value if JSON

check_index - verify if index exists in JSON

read_values - read cookie value as string

read_JSON - read cookie value as JSON object

read_value - read value of index stored in JSON object

replace_value - replace value from a specified index stored in JSON object

remove_value - remove value and index stored in JSON object

Just use:

$.super_cookie().create("name_of_the_cookie",name_field_1:"value1",name_field_2:"value2"});
$.super_cookie().read_json("name_of_the_cookie");

Why should C++ programmers minimize use of 'new'?

One more point to all the above correct answers, it depends on what sort of programming you are doing. Kernel developing in Windows for example -> The stack is severely limited and you might not be able to take page faults like in user mode.

In such environments, new, or C-like API calls are prefered and even required.

Of course, this is merely an exception to the rule.

How to insert a value that contains an apostrophe (single quote)?

eduffy had a good idea. He just got it backwards in his code example. Either in JavaScript or in SQLite you can replace the apostrophe with the accent symbol.

He (accidentally I am sure) placed the accent symbol as the delimiter for the string instead of replacing the apostrophe in O'Brian. This is in fact a terrifically simple solution for most cases.

Test if string is URL encoded in PHP

I am using the following test to see if strings have been urlencoded:

if(urlencode($str) != str_replace(['%','+'], ['%25','%2B'], $str))

If a string has already been urlencoded, the only characters that will changed by double encoding are % (which starts all encoded character strings) and + (which replaces spaces.) Change them back and you should have the original string.

Let me know if this works for you.

When do I use the PHP constant "PHP_EOL"?

Handy with error_log() if you're outputting multiple lines.

I've found a lot of debug statements look weird on my windows install since the developers have assumed unix endings when breaking up strings.

Authentication issues with WWW-Authenticate: Negotiate

The web server is prompting you for a SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism) token.

This is a Microsoft invention for negotiating a type of authentication to use for Web SSO (single-sign-on):

either NTLM
or Kerberos.

See:

Microsoft MSDN Library: HTTP-Based Cross-Platform Authentication by Using the Negotiate Protocol
RFC 4178: The Simple and Protected Generic Security Service Application Program Interface (GSS-API) Negotiation Mechanism

jQuery: Uncheck other checkbox on one checked

Try this

$("[id*='type']").click(
function () {
var isCheckboxChecked = this.checked;
$("[id*='type']").attr('checked', false);
this.checked = isCheckboxChecked;
});

To make it even more generic you can also find checkboxes by the common class implemented on them.

Modified...

Best way to represent a Grid or Table in AngularJS with Bootstrap 3?

Kendo grid is good as well as Wijmo. I know Kendo comes with Angular bindings for their datasource and I think Wijmo has an Angular plugin. Neither are free though.

Binding objects defined in code-behind

You can set the DataContext for your control, form, etc. like so:

DataContext="{Binding RelativeSource={RelativeSource Self}}"

Clarification:

The data context being set to the value above should be done at whatever element "owns" the code behind -- so for a Window, you should set it in the Window declaration.

I have your example working with this code:

<Window x:Class="MyClass"
  Title="{Binding windowname}"
  DataContext="{Binding RelativeSource={RelativeSource Self}}"
  Height="470" Width="626">

The DataContext set at this level then is inherited by any element in the window (unless you explicitly change it for a child element), so after setting the DataContext for the Window you should be able to just do straight binding to CodeBehind properties from any control on the window.

How to programmatically connect a client to a WCF service?

You can also do what the "Service Reference" generated code does

public class ServiceXClient : ClientBase<IServiceX>, IServiceX
{
    public ServiceXClient() { }

    public ServiceXClient(string endpointConfigurationName) :
        base(endpointConfigurationName) { }

    public ServiceXClient(string endpointConfigurationName, string remoteAddress) :
        base(endpointConfigurationName, remoteAddress) { }

    public ServiceXClient(string endpointConfigurationName, EndpointAddress remoteAddress) :
        base(endpointConfigurationName, remoteAddress) { }

    public ServiceXClient(Binding binding, EndpointAddress remoteAddress) :
        base(binding, remoteAddress) { }

    public bool ServiceXWork(string data, string otherParam)
    {
        return base.Channel.ServiceXWork(data, otherParam);
    }
}

Where IServiceX is your WCF Service Contract

Then your client code:

var client = new ServiceXClient(new WSHttpBinding(SecurityMode.None), new EndpointAddress("http://localhost:911"));
client.ServiceXWork("data param", "otherParam param");

Java: is there a map function?

Even though it's an old question I'd like to show another solution:

Just define your own operation using java generics and java 8 streams:

public static <S, T> List<T> map(Collection<S> collection, Function<S, T> mapFunction) {
   return collection.stream().map(mapFunction).collect(Collectors.toList());
}

Than you can write code like this:

List<String> hex = map(Arrays.asList(10, 20, 30, 40, 50), Integer::toHexString);

"Uncaught TypeError: Illegal invocation" in Chrome

When you execute a method (i.e. function assigned to an object), inside it you can use this variable to refer to this object, for example:

_x000D_

var obj = {_x000D_
  someProperty: true,_x000D_
  someMethod: function() {_x000D_
    console.log(this.someProperty);_x000D_
  }_x000D_
};_x000D_
obj.someMethod(); // logs true

_x000D_

If you assign a method from one object to another, its this variable refers to the new object, for example:

_x000D_

var obj = {_x000D_
  someProperty: true,_x000D_
  someMethod: function() {_x000D_
    console.log(this.someProperty);_x000D_
  }_x000D_
};_x000D_
_x000D_
var anotherObj = {_x000D_
  someProperty: false,_x000D_
  someMethod: obj.someMethod_x000D_
};_x000D_
_x000D_
anotherObj.someMethod(); // logs false

_x000D_

The same thing happens when you assign requestAnimationFrame method of window to another object. Native functions, such as this, has build-in protection from executing it in other context.

There is a Function.prototype.call() function, which allows you to call a function in another context. You just have to pass it (the object which will be used as context) as a first parameter to this method. For example alert.call({}) gives TypeError: Illegal invocation. However, alert.call(window) works fine, because now alert is executed in its original scope.

If you use .call() with your object like that:

support.animationFrame.call(window, function() {});

it works fine, because requestAnimationFrame is executed in scope of window instead of your object.

However, using .call() every time you want to call this method, isn't very elegant solution. Instead, you can use Function.prototype.bind(). It has similar effect to .call(), but instead of calling the function, it creates a new function which will always be called in specified context. For example:

_x000D_

window.someProperty = true;_x000D_
var obj = {_x000D_
  someProperty: false,_x000D_
  someMethod: function() {_x000D_
    console.log(this.someProperty);_x000D_
  }_x000D_
};_x000D_
_x000D_
var someMethodInWindowContext = obj.someMethod.bind(window);_x000D_
someMethodInWindowContext(); // logs true

_x000D_

The only downside of Function.prototype.bind() is that it's a part of ECMAScript 5, which is not supported in IE <= 8. Fortunately, there is a polyfill on MDN.

As you probably already figured out, you can use .bind() to always execute requestAnimationFrame in context of window. Your code could look like this:

var support = {
    animationFrame: (window.requestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        window.oRequestAnimationFrame).bind(window)
};

Then you can simply use support.animationFrame(function() {});.

Generate random password string with requirements in javascript

Create a Password generator service called PassswordGeneratorService

import { Injectable } from '@angular/core';

@Injectable()
export class PasswordGeneratorService {

  generatePassword(length:number,upper:boolean,numbers:boolean,symbols:boolean) {
    const passwordLength = length || 12;
    const addUpper =  upper;
    const addNumbers =  numbers;
    const addSymbols =  symbols;

    const lowerCharacters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
    const upperCharacters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];
    const numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
    const symbols = ['!', '?', '@'];

    const getRandom = array => array[Math.floor(Math.random() * array.length)];

    let finalCharacters = '';

    if (addUpper) {
      finalCharacters = finalCharacters.concat(getRandom(upperCharacters));
    }

    if (addNumbers) {
      finalCharacters = finalCharacters.concat(getRandom(numbers));
    }

    if (addSymbols) {
      finalCharacters = finalCharacters.concat(getRandom(symbols));
    }

    for (let i = 1; i < passwordLength - 3; i++) {
      finalCharacters = finalCharacters.concat(getRandom(lowerCharacters));
    }

    return  finalCharacters.split('').sort(() => 0.5 - Math.random()).join('');
  }
}

don't forget to add the service on the module your using

@NgModule({
  imports: [
    CommonModule,
    SharedModule,
    CommonModule,
    RouterModule.forChild(routes),
    FormsModule,
    ReactiveFormsModule,
    FlexLayoutModule,
    TranslateModule,
    ExistingUserDialogModule,
    UserDocumentsUploadDialogModule
  ],
  declarations: [
    UserListComponent,
    EditUserDialogComponent,
    UserEditorComponent
  ],
  entryComponents: [
    EditUserDialogComponent
  ],
  providers: [
    AuthService,
    PasswordGeneratorService
  ]
})
export class UsersModule {
}

On you controller add a method which calls the generate password method inside the service and set the result on the password field

  constructor(
     private passwordGenerator: PasswordGeneratorService,
    )
  get newPassword() {
    return this.password.get('newPassword');
  }
  generatePassword() {
    this.newPassword.setValue(this.passwordGenerator.generatePassword(8,true,true,true));
  }

plot.new has not been called yet

In my case, I was trying to call plot(x, y) and lines(x, predict(yx.lm), col="red") in two separate chunks in Rmarkdown file. It worked without problems when running chunk by chunk, but the corresponding document wouldn't knit. After I moved all plotting calls within one chunk, problem was resolved.

Reference member variables as class members

Member references are usually considered bad. They make life hard compared to member pointers. But it's not particularly unsual, nor is it some special named idiom or thing. It's just aliasing.

How to make MySQL table primary key auto increment with some prefix

Here is PostgreSQL example without trigger if someone need it on PostgreSQL:

CREATE SEQUENCE messages_seq;

 CREATE TABLE IF NOT EXISTS messages (
    id CHAR(20) NOT NULL DEFAULT ('message_' || nextval('messages_seq')),
    name CHAR(30) NOT NULL,
);

ALTER SEQUENCE messages_seq OWNED BY messages.id;

apache not accepting incoming connections from outside of localhost

CentOS 7 uses firewalld by default now. But all the answers focus on iptables. So I wanted to add an answer related to firewalld.

Since firewalld is a "wrapper" for iptables, using antonio-fornie's answer still seems to work but I was unable to "save" that new rule. So I wasn't able to connect to my apache server as soon as a restart of the firewall happened. Luckily it is actually much more straightforward to make an equivalent change with firewalld commands. First check if firewalld is running:

firewall-cmd --state

If it is running the response will simply be one line that says "running".

To allow http (port 80) connections temporarily on the public zone:

sudo firewall-cmd --zone=public --add-service=http

The above will not be "saved", next time the firewalld service is restarted it'll go back to default rules. You should use this temporary rule to test and make sure it solves your connection issue before moving on.

To permanently allow http connections on the public zone:

sudo firewall-cmd --zone=public --permanent --add-service=http

If you do the "permanent" command without doing the "temporary" command as well, you'll need to restart firewalld to get your new default rules (this might be different for non CentOS systems):

 sudo systemctl restart firewalld.service

If this hasn't solved your connection issues it may be because your interface isn't in the "public zone". The following link is a great resource for learning about firewalld. It goes over in detail how to check, assign, and configure zones: https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7

PHP 5.4 Call-time pass-by-reference - Easy fix available?

For anyone who, like me, reads this because they need to update a giant legacy project to 5.6: as the answers here point out, there is no quick fix: you really do need to find each occurrence of the problem manually, and fix it.

The most convenient way I found to find all problematic lines in a project (short of using a full-blown static code analyzer, which is very accurate but I don't know any that take you to the correct position in the editor right away) was using Visual Studio Code, which has a nice PHP linter built in, and its search feature which allows searching by Regex. (Of course, you can use any IDE/Code editor for this that does PHP linting and Regex searches.)

Using this regex:

^(?!.*function).*(\&\$)

it is possible to search project-wide for the occurrence of &$ only in lines that are not a function definition.

This still turns up a lot of false positives, but it does make the job easier.

VSCode's search results browser makes walking through and finding the offending lines super easy: you just click through each result, and look out for those that the linter underlines red. Those you need to fix.

List changes unexpectedly after assignment. How do I clone or copy it to prevent this?

The method to use depends on the contents of the list being copied. If the list contains nested dicts than deepcopy is the only method that works, otherwise most of the methods listed in the answers (slice, loop [for], copy, extend, combine, or unpack) will work and execute in similar time (except for loop and deepcopy, which preformed the worst).

Script

from random import randint
from time import time
import copy

item_count = 100000

def copy_type(l1: list, l2: list):
  if l1 == l2:
    return 'shallow'
  return 'deep'

def run_time(start, end):
  run = end - start
  return int(run * 1000000)

def list_combine(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = [] + l1
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'combine', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

def list_extend(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = []
  l2.extend(l1)
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'extend', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

def list_unpack(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = [*l1]
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'unpack', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

def list_deepcopy(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = copy.deepcopy(l1)
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'deepcopy', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

def list_copy(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = list.copy(l1)
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'copy', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

def list_slice(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = l1[:]
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'slice', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

def list_loop(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = []
  for i in range(len(l1)):
    l2.append(l1[i])
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'loop', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

def list_list(data):
  l1 = [data for i in range(item_count)]
  start = time()
  l2 = list(l1)
  end = time()
  if type(data) == dict:
    l2[0]['test'].append(1)
  elif type(data) == list:
    l2.append(1)
  return {'method': 'list()', 'copy_type': copy_type(l1, l2), 
          'time_µs': run_time(start, end)}

if __name__ == '__main__':
  list_type = [{'list[dict]': {'test': [1, 1]}}, 
          {'list[list]': [1, 1]}]
  store = []
  for data in list_type:
    key = list(data.keys())[0]
    store.append({key: [list_unpack(data[key]), list_extend(data[key]), 
                list_combine(data[key]), list_deepcopy(data[key]), 
                list_copy(data[key]), list_slice(data[key]),           
                list_loop(data[key])]})
  print(store)

Results

[{"list[dict]": [
  {"method": "unpack", "copy_type": "shallow", "time_µs": 56149},
  {"method": "extend", "copy_type": "shallow", "time_µs": 52991},
  {"method": "combine", "copy_type": "shallow", "time_µs": 53726},
  {"method": "deepcopy", "copy_type": "deep", "time_µs": 2702616},
  {"method": "copy", "copy_type": "shallow", "time_µs": 52204},
  {"method": "slice", "copy_type": "shallow", "time_µs": 52223},
  {"method": "loop", "copy_type": "shallow", "time_µs": 836928}]},
{"list[list]": [
  {"method": "unpack", "copy_type": "deep", "time_µs": 52313},
  {"method": "extend", "copy_type": "deep", "time_µs": 52550},
  {"method": "combine", "copy_type": "deep", "time_µs": 53203},
  {"method": "deepcopy", "copy_type": "deep", "time_µs": 2608560},
  {"method": "copy", "copy_type": "deep", "time_µs": 53210},
  {"method": "slice", "copy_type": "deep", "time_µs": 52937},
  {"method": "loop", "copy_type": "deep", "time_µs": 834774}
]}]

Minimum 6 characters regex expression

This match 6 or more any chars but newline:

/^.{6,}$/

Formatting floats in a numpy array

[ round(x,2) for x in [2.15295647e+01, 8.12531501e+00, 3.97113829e+00, 1.00777250e+01]]

Can't bind to 'ngModel' since it isn't a known property of 'input'

Though the answer solves the issue, I would like to provide a little more information on this topic as I have also undergone this issue when I started to work on Angular projects.

A beginner should understand that there are two main types of forms. They are Reactive forms and Template-driven forms. From Angular 2 onward, it is recommended to use Reactive forms for any kind of forms.

Reactive forms are more robust: they're more scalable, reusable, and testable. If forms are a key part of your application, or you're already using reactive patterns for building your application, use reactive forms.

Template-driven forms are useful for adding a simple form to an application, such as an email list signup form. They're easy to add to an application, but they don't scale as well as reactive forms. If you have very basic form requirements and logic that can be managed solely in the template, use template-driven forms.

Refer Angular documents for more details.

Coming to the question, [(ngModel)]="..." is basically a binding syntax. In order to use this in your component HTML page, you should import FormsModule in your NgModule (where your component is present). Now [(ngModel)] is used for a simple two-way binding or this is used in your form for any input HTML element.

On the other hand, to use reactive forms, import ReactiveFormsModule from the @angular/forms package and add it to your NgModule's imports array.

For example, if my component HTML content does not have [(ngmodel)] in any HTML element, then I don't need to import FormsModule.

In my below example, I have completely used Reactive Forms and hence I don't need to use FormsModule in my NgModule.

Create GroupsModule:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { GroupsRoutingModule, routedAccountComponents } from './groups-routing.module';
import { ReactiveFormsModule } from '@angular/forms';
import { SharedModule } from '../shared/shared.module';
import { ModalModule } from 'ngx-bootstrap';
@NgModule({
    declarations: [
        routedAccountComponents
    ],
    imports: [
        CommonModule,
        ReactiveFormsModule,
        GroupsRoutingModule,
        SharedModule,
        ModalModule.forRoot()
    ]
})
export class GroupsModule {
}

Create the routing module (separated to main the code and for readability):


import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { GroupsComponent } from './all/index.component';
import { CreateGroupComponent } from './create/index.component';

const routes: Routes = [
  {
    path: '',
    redirectTo: 'groups',
    pathMatch: 'full'
  },
  {
    path: 'groups',
    component: GroupsComponent
  }
];


@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class GroupsRoutingModule { }


export const routedAccountComponents = [
  GroupsComponent,
  CreateGroupComponent
];

CreateGroupComponent html code

<form [formGroup]="form" (ngSubmit)="onSubmit()">
        <label for="name">Group Name</label>
        <div class="form-group">
            <div class="form-line">
                <input type="text" formControlName="name" class="form-control">
            </div>
        </div>
    </form>

CreateGroupComponent ts file


import { Component, OnInit, Output, EventEmitter } from '@angular/core';
import { DialogResult } from 'src/app/shared/modal';
import { FormGroup, FormControl, AbstractControl } from '@angular/forms';
import { Subject } from 'rxjs';
import { ToastrService } from 'ngx-toastr';
import { validateAllFormFields } from 'src/app/services/validateAllFormFields';
import { HttpErrorResponse } from '@angular/common/http';
import { modelStateFormMapper } from 'src/app/services/shared/modelStateFormMapper';
import { GroupsService } from '../groups.service';
import { CreateGroup } from '../model/create-group.model';

@Component({
    selector: 'app-create-group',
    templateUrl: './index.component.html',
    providers: [LoadingService]
})

export class CreateGroupComponent implements OnInit {
    public form: FormGroup;
    public errors: string[] = [];
    private destroy: Subject<void> = new Subject<void>();

    constructor(
        private groupService: GroupsService,
        private toastr: ToastrService
    ) { }

    private buildForm(): FormGroup {
        return new FormGroup({
            name: new FormControl('', [Validators.maxLength(254)])
        });
    }

    private getModel(): CreateGroup {
        const formValue = this.form.value;
        return <CreateGroup>{
            name: formValue.name
        };
    }

    public control(name: string): AbstractControl {
        return this.form.get(name);
    }

    public ngOnInit() {
        this.form = this.buildForm();
    }


    public onSubmit(): void {

         if (this.form.valid) {
             // this.onSubmit();
             //do what you need to do
         }
    }
}

I hope this helps developers to understand as to why and when you need to use FormsModule.

C++ cout hex values?

C++20 std::format

This is now the cleanest method in my opinion, as it does not pollute std::cout state with std::hex:

main.cpp

#include <format>
#include <string>

int main() {
    std::cout << std::format("{:x} {:#x} {}\n", 16, 17, 18);
}

Expected output:

10 0x11 18

Not yet implemented on GCC 10.0.1, Ubuntu 20.04.

But the awesome library that became C++20 and should be the same worked once installed with:

git clone https://github.com/fmtlib/fmt
cd fmt
git checkout 061e364b25b5e5ca7cf50dd25282892922375ddc
mkdir build
cmake ..
sudo make install

main2.cpp

#include <fmt/core.h>
#include <iostream>

int main() {
    std::cout << fmt::format("{:x} {:#x} {}\n", 16, 17, 18);
}

Compile and run:

g++ -ggdb3 -O0 -std=c++11 -Wall -Wextra -pedantic -o main2.out main2.cpp -lfmt
./main2.out

Documented at:

More info at: std::string formatting like sprintf

Pre-C++20: cleanly print and restore std::cout to previous state

main.cpp

#include <iostream>
#include <string>

int main() {
    std::ios oldState(nullptr);
    oldState.copyfmt(std::cout);
    std::cout << std::hex;
    std::cout << 16 << std::endl;
    std::cout.copyfmt(oldState);
    std::cout << 17 << std::endl;
}

Compile and run:

g++ -ggdb3 -O0 -std=c++11 -Wall -Wextra -pedantic -o main.out main.cpp
./main.out

Output:

10
17

More details: Restore the state of std::cout after manipulating it

Tested on GCC 10.0.1, Ubuntu 20.04.

Call static methods from regular ES6 class methods

Both ways are viable, but they do different things when it comes to inheritance with an overridden static method. Choose the one whose behavior you expect:

class Super {
  static whoami() {
    return "Super";
  }
  lognameA() {
    console.log(Super.whoami());
  }
  lognameB() {
    console.log(this.constructor.whoami());
  }
}
class Sub extends Super {
  static whoami() {
    return "Sub";
  }
}
new Sub().lognameA(); // Super
new Sub().lognameB(); // Sub

Referring to the static property via the class will be actually static and constantly give the same value. Using this.constructor instead will use dynamic dispatch and refer to the class of the current instance, where the static property might have the inherited value but could also be overridden.

This matches the behavior of Python, where you can choose to refer to static properties either via the class name or the instance self.

If you expect static properties not to be overridden (and always refer to the one of the current class), like in Java, use the explicit reference.

SSH library for Java

I just discovered sshj, which seems to have a much more concise API than JSCH (but it requires Java 6). The documentation is mostly by examples-in-the-repo at this point, and usually that's enough for me to look elsewhere, but it seems good enough for me to give it a shot on a project I just started.

How to stop the Timer in android?

I had a similar problem and it was caused by the placement of the Timer initialisation.

It was placed in a method that was invoked oftener.

Try this:

Timer waitTimer;

  void exampleMethod() {

   if (waitTimer == null ) {
    //initialize your Timer here
    ...
   }

The "cancel()" method only canceled the latest Timer. The older ones were ignored an didn't stop running.

Fetching data from MySQL database to html dropdown list

# here database details      
mysql_connect('hostname', 'username', 'password');
mysql_select_db('database-name');

$sql = "SELECT username FROM userregistraton";
$result = mysql_query($sql);

echo "<select name='username'>";
while ($row = mysql_fetch_array($result)) {
    echo "<option value='" . $row['username'] ."'>" . $row['username'] ."</option>";
}
echo "</select>";

# here username is the column of my table(userregistration)
# it works perfectly

Converting from signed char to unsigned char and back again?

I'm not 100% sure that I understand your question, so tell me if I'm wrong.

If I got it right, you are reading jbytes that are technically signed chars, but really pixel values ranging from 0 to 255, and you're wondering how you should handle them without corrupting the values in the process.

Then, you should do the following:

convert jbytes to unsigned char before doing anything else, this will definetly restore the pixel values you are trying to manipulate
use a larger signed integer type, such as int while doing intermediate calculations, this to make sure that over- and underflows can be detected and dealt with (in particular, not casting to a signed type could force to compiler to promote every type to an unsigned type in which case you wouldn't be able to detect underflows later on)
when assigning back to a jbyte, you'll want to clamp your value to the 0-255 range, convert to unsigned char and then convert again to signed char: I'm not certain the first conversion is strictly necessary, but you just can't be wrong if you do both

For example:

inline int fromJByte(jbyte pixel) {
    // cast to unsigned char re-interprets values as 0-255
    // cast to int will make intermediate calculations safer
    return static_cast<int>(static_cast<unsigned char>(pixel));
}

inline jbyte fromInt(int pixel) {
    if(pixel < 0)
        pixel = 0;

    if(pixel > 255)
        pixel = 255;

    return static_cast<jbyte>(static_cast<unsigned char>(pixel));
}

jbyte in = ...
int intermediate = fromJByte(in) + 30;
jbyte out = fromInt(intermediate);

Break string into list of characters in Python

Or use a fancy list comprehension, which are supposed to be "computationally more efficient", when working with very very large files/lists

fd = open(filename,'r')
chars = [c for line in fd for c in line if c is not " "]
fd.close()

Btw: The answer that was accepted does not account for the whitespaces...

Return Max Value of range that is determined by an Index & Match lookup

You don't need an index match formula. You can use this array formula. You have to press CTL + SHIFT + ENTER after you enter the formula.

=MAX(IF((A1:A6=A10)*(B1:B6=B10),C1:F6))

SNAPSHOT

enter image description here

'System.Net.Http.HttpContent' does not contain a definition for 'ReadAsAsync' and no extension method

Make sure that you have installed the correct NuGet package in your console application:

<package id="Microsoft.AspNet.WebApi.Client" version="4.0.20710.0" />

and that you are targeting at least .NET 4.0.

This being said, your GetAllFoos function is defined to return an IEnumerable<Prospect> whereas in your ReadAsAsync method you are passing IEnumerable<Foo> which obviously are not compatible types.

Install-Package Microsoft.AspNet.WebApi.Client

How to replace text in a column of a Pandas dataframe?

For anyone else arriving here from Google search on how to do a string replacement on all columns (for example, if one has multiple columns like the OP's 'range' column): Pandas has a built in replace method available on a dataframe object.

df.replace(',', '-', regex=True)

Source: Docs

Append file contents to the bottom of existing file in Bash

This should work:

 cat "$API" >> "$CONFIG"

You need to use the >> operator to append to a file. Redirecting with > causes the file to be overwritten. (truncated).

How can I read numeric strings in Excel cells as string (not numbers)?

It looks like this can't be done in the current version of POI, based on the fact that this bug:

https://issues.apache.org/bugzilla/show_bug.cgi?id=46136

is still outstanding.

What is the height of Navigation Bar in iOS 7?

There is a difference between the navigation bar and the status bar. The confusing part is that it looks like one solid feature at the top of the screen, but the areas can actually be separated into two distinct views; a status bar and a navigation bar. The status bar spans from y=0 to y=20 points and the navigation bar spans from y=20 to y=64 points. So the navigation bar (which is where the page title and navigation buttons go) has a height of 44 points, but the status bar and navigation bar together have a total height of 64 points.

Here is a great resource that addresses this question along with a number of other sizing idiosyncrasies in iOS7: http://ivomynttinen.com/blog/the-ios-7-design-cheat-sheet/

Fastest way to convert Image to Byte array

public static byte[] ReadImageFile(string imageLocation)
    {
        byte[] imageData = null;
        FileInfo fileInfo = new FileInfo(imageLocation);
        long imageFileLength = fileInfo.Length;
        FileStream fs = new FileStream(imageLocation, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fs);
        imageData = br.ReadBytes((int)imageFileLength);
        return imageData;
    }

SEVERE: Unable to create initial connections of pool - tomcat 7 with context.xml file

You have to add a MySQL jdbc driver to the classpath.

Either put a MySQL binary jar to tomcat lib folder or add it to we application WEB-INF/lib folder.

You can find binary jar (Change version accordingly): https://mvnrepository.com/artifact/mysql/mysql-connector-java/5.1.27

How can I use a C++ library from node.js?

You could use emscripten to compile C++ code into js.

Converting stream of int's to char's in java

Maybe you are asking for:

Character.toChars(65) // returns ['A']

More info: Character.toChars(int codePoint)

Converts the specified character (Unicode code point) to its UTF-16 representation stored in a char array. If the specified code point is a BMP (Basic Multilingual Plane or Plane 0) value, the resulting char array has the same value as codePoint. If the specified code point is a supplementary code point, the resulting char array has the corresponding surrogate pair.

How to get the response of XMLHttpRequest?

I'd suggest looking into fetch. It is the ES5 equivalent and uses Promises. It is much more readable and easily customizable.

_x000D_

const url = "https://stackoverflow.com";
fetch(url)
    .then(
        response => response.text() // .json(), etc.
        // same as function(response) {return response.text();}
    ).then(
        html => console.log(html)
    );

_x000D_

In Node.js, you'll need to import fetch using:

const fetch = require("node-fetch");

If you want to use it synchronously (doesn't work in top scope):

const json = await fetch(url)
  .then(response => response.json())
  .catch((e) => {});

More Info:

Mozilla Documentation

Can I Use (95% Feb 2020)

Matt Walsh Tutorial

Extract / Identify Tables from PDF python

You should definitely have a look at this answer of mine:

Extracting table contents from a collection of PDF files

and also have a look at all the links included therein.

Tabula/TabulaPDF is currently the best table extraction tool that is available for PDF scraping.

Filename too long in Git for Windows

This might help:

git config core.longpaths true

Basic explanation: This answer suggests not to have such setting applied to the global system (to all projects so avoiding --system or --global tag) configurations. This command only solves the problem by being specific to the current project.

EDIT:

This is an important answer related to the "permission denied" issue for those whom does not granted to change git settings globally.

DateTime to javascript date

You can try this in your Action:

return DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss");

And this in your Ajax success:

success: function (resultDateString) {
    var date = new Date(resultDateString);
}

Or this in your View: (Javascript plus C#)

var date = new Date('@DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss")');

Regular expression which matches a pattern, or is an empty string

To match pattern or an empty string, use

^$|pattern

Explanation

^ and $ are the beginning and end of the string anchors respectively.
| is used to denote alternates, e.g. this|that.

References

regular-expressions.info/Anchors and Alternation

On `\b`

\b in most flavor is a "word boundary" anchor. It is a zero-width match, i.e. an empty string, but it only matches those strings at very specific places, namely at the boundaries of a word.

That is, \b is located:

Between consecutive \w and \W (either order):
- i.e. between a word character and a non-word character
Between ^ and \w
- i.e. at the beginning of the string if it starts with \w
Between \w and $
- i.e. at the end of the string if it ends with \w

References

regular-expressions.info/Word Boundaries

On using regex to match e-mail addresses

This is not trivial depending on specification.

How can I find the maximum value and its index in array in MATLAB?

For a matrix you can use this:

[M,I] = max(A(:))

I is the index of A(:) containing the largest element.

Now, use the ind2sub function to extract the row and column indices of A corresponding to the largest element.

[I_row, I_col] = ind2sub(size(A),I)

source: https://www.mathworks.com/help/matlab/ref/max.html

Breaking a list into multiple columns in Latex

Another option to avoid nesting two different environments (like multicols and enumerate).

The environment called tasks from the package with the same name seems to me very easy to customize thanks to a variety of options (pdf guide here).

This code:

\documentclass{article}
\usepackage{tasks}

%\settasks{style=itemize}

\begin{document}
Text text text text text text text text text text text text 
text text text text text text text text text text text text 
text text text text text text text text text text text text.

\begin{tasks}(2)
\task[*] a
\task[*] b
\task[*] c
\task[*] d
\task[*] e
\task[*] f
\end{tasks}    

Text text text text text text text text text text text text 
text text text text text text text text text text text text 
text text text text text text text text text text text text.
\end{document}

produces this output

The package tasks was updated in August 2020 and it was originally created specifically for horizontally columned lists (see the screenshot just above here), the motivations behind this are resumed in the guide. If such arrangement of the items/tasks is acceptable, then this may be a good choice since it keeps - IMHO - the code tidy and flexible.

What is the difference between Nexus and Maven?

Whatever I understood from my learning and what I think it is is here. I am Quoting some part from a book i learnt this things. Nexus Repository Manager and Nexus Repository Manager OSS started as a repository manager supporting the Maven repository format. While it supports many other repository formats now, the Maven repository format is still the most common and well supported format for build and provisioning tools running on the JVM and beyond. This chapter shows example configurations for using the repository manager with Apache Maven and a number of other tools. The setups take advantage of merging many repositories and exposing them via a repository group. Setting this up is documented in the chapter in addition to the configuration used by specific tools.

Details

R: Comment out block of code

A sort of block comment uses an if statement:

if(FALSE) {
  all your code
}

It works, but I almost always use the block comment options of my editors (RStudio, Kate, Kwrite).

How to remove package using Angular CLI?

I don't know about CLI, I had tried, but I couldn't. I deleted using IDE Idea history.

If You use an Intellij Idea, just open History changes.

Tap by main folder of the project -> right click -> local history -> show history.

Then from top to bottom revert changes.

It should help! Good luck!=)

Remove Object from Array using JavaScript

You can use several methods to remove item(s) from an Array:

//1
someArray.shift(); // first element removed
//2
someArray = someArray.slice(1); // first element removed
//3
someArray.splice(0, 1); // first element removed
//4
someArray.pop(); // last element removed
//5
someArray = someArray.slice(0, a.length - 1); // last element removed
//6
someArray.length = someArray.length - 1; // last element removed

If you want to remove element at position x, use:

someArray.splice(x, 1);

someArray = someArray.slice(0, x).concat(someArray.slice(-x));

Reply to the comment of @chill182: you can remove one or more elements from an array using Array.filter, or Array.splice combined with Array.findIndex (see MDN), e.g.

_x000D_

// non destructive filter > noJohn = John removed, but someArray will not change_x000D_
let someArray = getArray();_x000D_
let noJohn = someArray.filter( el => el.name !== "John" ); _x000D_
log("non destructive filter > noJohn = ", format(noJohn));_x000D_
log(`**someArray.length ${someArray.length}`);_x000D_
_x000D_
// destructive filter/reassign John removed > someArray2 =_x000D_
let someArray2 = getArray();_x000D_
someArray2 = someArray2.filter( el => el.name !== "John" );_x000D_
log("", "destructive filter/reassign John removed > someArray2 =", _x000D_
  format(someArray2));_x000D_
log(`**someArray2.length ${someArray2.length}`);_x000D_
_x000D_
// destructive splice /w findIndex Brian remains > someArray3 =_x000D_
let someArray3 = getArray();_x000D_
someArray3.splice(someArray3.findIndex(v => v.name === "Kristian"), 1);_x000D_
someArray3.splice(someArray3.findIndex(v => v.name === "John"), 1);_x000D_
log("", "destructive splice /w findIndex Brian remains > someArray3 =", _x000D_
  format(someArray3));_x000D_
log(`**someArray3.length ${someArray3.length}`);_x000D_
_x000D_
// Note: if you're not sure about the contents of your array, _x000D_
// you should check the results of findIndex first_x000D_
let someArray4 = getArray();_x000D_
const indx = someArray4.findIndex(v => v.name === "Michael");_x000D_
someArray4.splice(indx, indx >= 0 ? 1 : 0);_x000D_
log("", "check findIndex result first > someArray4 (nothing is removed) > ",_x000D_
  format(someArray4));_x000D_
log(`**someArray4.length (should still be 3) ${someArray4.length}`);_x000D_
_x000D_
function format(obj) {_x000D_
  return JSON.stringify(obj, null, " ");_x000D_
}_x000D_
_x000D_
function log(...txt) {_x000D_
  document.querySelector("pre").textContent += `${txt.join("\n")}\n`_x000D_
}_x000D_
_x000D_
function getArray() {_x000D_
  return [ {name: "Kristian", lines: "2,5,10"},_x000D_
           {name: "John", lines: "1,19,26,96"},_x000D_
           {name: "Brian", lines: "3,9,62,36"} ];_x000D_
}

_x000D_

<pre>_x000D_
**Results**_x000D_
_x000D_
</pre>

_x000D_

What is the difference between float and double?

Given a quadratic equation: x² − 4.0000000 x + 3.9999999 = 0, the exact roots to 10 significant digits are, r₁ = 2.000316228 and r₂ = 1.999683772.

Using float and double, we can write a test program:

#include <stdio.h>
#include <math.h>

void dbl_solve(double a, double b, double c)
{
    double d = b*b - 4.0*a*c;
    double sd = sqrt(d);
    double r1 = (-b + sd) / (2.0*a);
    double r2 = (-b - sd) / (2.0*a);
    printf("%.5f\t%.5f\n", r1, r2);
}

void flt_solve(float a, float b, float c)
{
    float d = b*b - 4.0f*a*c;
    float sd = sqrtf(d);
    float r1 = (-b + sd) / (2.0f*a);
    float r2 = (-b - sd) / (2.0f*a);
    printf("%.5f\t%.5f\n", r1, r2);
}   

int main(void)
{
    float fa = 1.0f;
    float fb = -4.0000000f;
    float fc = 3.9999999f;
    double da = 1.0;
    double db = -4.0000000;
    double dc = 3.9999999;
    flt_solve(fa, fb, fc);
    dbl_solve(da, db, dc);
    return 0;
}

Running the program gives me:

2.00000 2.00000
2.00032 1.99968

Note that the numbers aren't large, but still you get cancellation effects using float.

(In fact, the above is not the best way of solving quadratic equations using either single- or double-precision floating-point numbers, but the answer remains unchanged even if one uses a more stable method.)

Location of WSDL.exe

You'll get it as part of a Visual Studio install (if you included the SDK), or in a standalone SDK install. It'll live somewhere like C:\program files\Microsoft Visual Studio 8\SDK\v2.0\Bin

If you don't already have it, you can download the .NET SDKs from
http://msdn.microsoft.com/en-us/netframework/aa569263.aspx

How do I perform an insert and return inserted identity with Dapper?

I was using .net core 3.1 with postgres 12.3. Building on the answer from Tadija Bagaric I ended up with:

using (var connection = new NpgsqlConnection(AppConfig.CommentFilesConnection))
        {

            string insertUserSql = @"INSERT INTO mytable(comment_id,filename,content)
                    VALUES( @commentId, @filename, @content) returning id;";

            int newUserId = connection.QuerySingle<int>(
                                            insertUserSql,
                                            new
                                            {
                                                commentId = 1,
                                                filename = "foobar!",
                                                content = "content"
                                            }
                                            );

          


        }

where AppConfig is my own class which simply gets a string set for my connection details. This is set within the Startup.cs ConfigureServices method.

Error "can't use subversion command line client : svn" when opening android project checked out from svn

i was also getting the same Error, if you are using TortoiseSVN-1.9.5 just do two step Process 1:Click on TSVN.exe tool and 2:Select there on Second Window the Command line for Save on Local Drive with giving the path 3:Click ok Now Restart You Android Studio/IntelliJ

How to call an action after click() in Jquery?

setTimeout may help out here

$("#message_link").click(function(){
   setTimeout(function() {
       if (some_conditions...){
           $("#header").append("<div><img alt=\"Loader\"src=\"/images/ajax-loader.gif\"  /></div>");
       }
   }, 100);
});

That will cause the div to be appended ~100ms after the click event occurs, if some_conditions are met.

How to change an application icon programmatically in Android?

You cannot change the manifest or the resource in the signed-and-sealed APK, except through a software upgrade.

how to use free cloud database with android app?

As Wingman said, Google App Engine is a great solution for your scenario.

You can get some information about GAE+Android here: https://developers.google.com/eclipse/docs/appengine_connected_android

And from this Google IO 2012 session: http://www.youtube.com/watch?v=NU_wNR_UUn4

How to remove all duplicate items from a list

There is a faster way to fix this:

list = [1, 1.0, 1.41, 1.73, 2, 2, 2.0, 2.24, 3, 3, 4, 4, 4, 5, 6, 6, 8, 8, 9, 10]
list2=[]

for value in list:
    try:
        list2.index(value)
    except:
        list2.append(value)
list.clear()
for value in list2:
    list.append(value)
list2.clear()
print(list)
print(list2)

Cross-Origin Request Blocked

@Egidius, when creating an XMLHttpRequest, you should use

var xhr = new XMLHttpRequest({mozSystem: true});

What is mozSystem?

mozSystem Boolean: Setting this flag to true allows making cross-site connections without requiring the server to opt-in using CORS. Requires setting mozAnon: true, i.e. this can't be combined with sending cookies or other user credentials. This only works in privileged (reviewed) apps; it does not work on arbitrary webpages loaded in Firefox.

Changes to your Manifest

On your manifest, do not forget to include this line on your permissions:

"permissions": {
       "systemXHR" : {},
}

changing minDate option in JQuery DatePicker not working

Use minDate as string:

$('#datePickerId').datepicker({minDate: '0'});

This would set today as minimum selectable date .

Does it matter what extension is used for SQLite database files?

SQLite doesn't define any particular extension for this, it's your own choice. Personally, I name them with the .sqlite extension, just so there isn't any ambiguity when I'm looking at my files later.

How to link home brew python version and set it as default

The problem with me is that I have so many different versions of python, so it opens up a different python3.7 even after I did brew link. I did the following additional steps to make it default after linking

First, open up the document setting up the path of python

 nano ~/.bash_profile

Then something like this shows up:

# Setting PATH for Python 3.7
# The original version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/3.7/bin:${PATH}"
export PATH

# Setting PATH for Python 3.6
# The original version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/3.6/bin:${PATH}"
export PATH

The thing here is that my Python for brew framework is not in the Library Folder!! So I changed the framework for python 3.7, which looks like follows in my system

# Setting PATH for Python 3.7
# The original version is saved in .bash_profile.pysave
PATH="/usr/local/Frameworks/Python.framework/Versions/3.7/bin:${PATH}"
export PATH

Change and save the file. Restart the computer, and typing in python3.7, I get the python I installed for brew.

Not sure if my case is applicable to everyone, but worth a try. Not sure if the framework path is the same for everyone, please made sure before trying out.

Check if list is empty in C#

    If (list.Count==0){
      //you can show your error messages here
    } else {
      //here comes your datagridview databind 
    }

You can make your datagrid visible false and make it visible on the else section.

How to get query string parameter from MVC Razor markup?

If you are using .net core 2.0 this would be:

Context.Request.Query["id"]

Sample usage:

<a href="@Url.Action("Query",new {parm1=Context.Request.Query["queryparm1"]})">GO</a>

Insert line break inside placeholder attribute of a textarea?

Textarea respects the white-space attribute for the placeholder. https://www.w3schools.com/cssref/pr_text_white-space.asp

Setting it to pre-line solved the problem for me.

_x000D_

textarea {_x000D_
  white-space: pre-line;_x000D_
}

_x000D_

<textarea placeholder='This is a line     _x000D_
should this be a new line'></textarea>

_x000D_

Difference between core and processor

I have read all answers, but this link was more clear explanation for me about difference between CPU(Processor) and Core. So I'm leaving here some notes from there.

The main difference between CPU and Core is that the CPU is an electronic circuit inside the computer that carries out instruction to perform arithmetic, logical, control and input/output operations while the core is an execution unit inside the CPU that receives and executes instructions.

JAVA - Best approach to parse huge (extra large) JSON file

How to put an image in div with CSS?

Take this as a sample code. Replace imageheight and image width with your image dimensions.

<div style="background:yourimage.jpg no-repeat;height:imageheight px;width:imagewidth px">
</div>

What do >> and << mean in Python?

<< Mean any given number will be multiply by 2the power
for exp:- 2<<2=2*2'1=4
          6<<2'4=6*2*2*2*2*2=64

Authenticated HTTP proxy with Java

Try this runner I wrote. It could be helpful.

import java.io.InputStream;
import java.lang.reflect.Method;
import java.net.Authenticator;
import java.net.PasswordAuthentication;
import java.net.URL;
import java.net.URLConnection;
import java.util.Scanner;

public class ProxyAuthHelper {

    public static void main(String[] args) throws Exception {
        String tmp = System.getProperty("http.proxyUser", System.getProperty("https.proxyUser"));
        if (tmp == null) {
            System.out.println("Proxy username: ");
            tmp = new Scanner(System.in).nextLine();
        }
        final String userName = tmp;

        tmp = System.getProperty("http.proxyPassword", System.getProperty("https.proxyPassword"));
        if (tmp == null) {
            System.out.println("Proxy password: ");
            tmp = new Scanner(System.in).nextLine();
        }
        final char[] password = tmp.toCharArray();

        Authenticator.setDefault(new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                System.out.println("\n--------------\nProxy auth: " + userName);
                return new PasswordAuthentication (userName, password);
            }

         });

        Class<?> clazz = Class.forName(args[0]);
        Method method = clazz.getMethod("main", String[].class);
        String[] newArgs = new String[args.length - 1];
        System.arraycopy(args, 1, newArgs, 0, newArgs.length);
        method.invoke(null, new Object[]{newArgs});
    }

}

How can I read input from the console using the Scanner class in Java?

You can flow this code:

Scanner obj= new Scanner(System.in);
String s = obj.nextLine();

How to trim whitespace from a Bash variable?

I've seen scripts just use variable assignment to do the job:

$ xyz=`echo -e 'foo \n bar'`
$ echo $xyz
foo bar

Whitespace is automatically coalesced and trimmed. One has to be careful of shell metacharacters (potential injection risk).

I would also recommend always double-quoting variable substitutions in shell conditionals:

if [ -n "$var" ]; then

since something like a -o or other content in the variable could amend your test arguments.

System.web.mvc missing

Had this problem in vs2017, I already got MVC via nuget but System.Web.Mvc didn't appear in the "Assemblies" list under "Add Reference".

The solution was to select "Extensions" under "Assemblies" in the "Add Reference" dialog.

What are C++ functors and their uses?

A big advantage of implementing functions as functors is that they can maintain and reuse state between calls. For example, many dynamic programming algorithms, like the Wagner-Fischer algorithm for calculating the Levenshtein distance between strings, work by filling in a large table of results. It's very inefficient to allocate this table every time the function is called, so implementing the function as a functor and making the table a member variable can greatly improve performance.

Below is an example of implementing the Wagner-Fischer algorithm as a functor. Notice how the table is allocated in the constructor, and then reused in operator(), with resizing as necessary.

#include <string>
#include <vector>
#include <algorithm>

template <typename T>
T min3(const T& a, const T& b, const T& c)
{
   return std::min(std::min(a, b), c);
}

class levenshtein_distance 
{
    mutable std::vector<std::vector<unsigned int> > matrix_;

public:
    explicit levenshtein_distance(size_t initial_size = 8)
        : matrix_(initial_size, std::vector<unsigned int>(initial_size))
    {
    }

    unsigned int operator()(const std::string& s, const std::string& t) const
    {
        const size_t m = s.size();
        const size_t n = t.size();
        // The distance between a string and the empty string is the string's length
        if (m == 0) {
            return n;
        }
        if (n == 0) {
            return m;
        }
        // Size the matrix as necessary
        if (matrix_.size() < m + 1) {
            matrix_.resize(m + 1, matrix_[0]);
        }
        if (matrix_[0].size() < n + 1) {
            for (auto& mat : matrix_) {
                mat.resize(n + 1);
            }
        }
        // The top row and left column are prefixes that can be reached by
        // insertions and deletions alone
        unsigned int i, j;
        for (i = 1;  i <= m; ++i) {
            matrix_[i][0] = i;
        }
        for (j = 1; j <= n; ++j) {
            matrix_[0][j] = j;
        }
        // Fill in the rest of the matrix
        for (j = 1; j <= n; ++j) {
            for (i = 1; i <= m; ++i) {
                unsigned int substitution_cost = s[i - 1] == t[j - 1] ? 0 : 1;
                matrix_[i][j] =
                    min3(matrix_[i - 1][j] + 1,                 // Deletion
                    matrix_[i][j - 1] + 1,                      // Insertion
                    matrix_[i - 1][j - 1] + substitution_cost); // Substitution
            }
        }
        return matrix_[m][n];
    }
};

Golang read request body

Inspecting and mocking request body

When you first read the body, you have to store it so once you're done with it, you can set a new io.ReadCloser as the request body constructed from the original data. So when you advance in the chain, the next handler can read the same body.

One option is to read the whole body using ioutil.ReadAll(), which gives you the body as a byte slice.

You may use bytes.NewBuffer() to obtain an io.Reader from a byte slice.

The last missing piece is to make the io.Reader an io.ReadCloser, because bytes.Buffer does not have a Close() method. For this you may use ioutil.NopCloser() which wraps an io.Reader, and returns an io.ReadCloser, whose added Close() method will be a no-op (does nothing).

Note that you may even modify the contents of the byte slice you use to create the "new" body. You have full control over it.

^{Care must be taken though, as there might be other HTTP fields like content-length and checksums which may become invalid if you modify only the data. If subsequent handlers check those, you would also need to modify those too!}

Inspecting / modifying response body

If you also want to read the response body, then you have to wrap the http.ResponseWriter you get, and pass the wrapper on the chain. This wrapper may cache the data sent out, which you can inspect either after, on on-the-fly (as the subsequent handlers write to it).

Here's a simple ResponseWriter wrapper, which just caches the data, so it'll be available after the subsequent handler returns:

type MyResponseWriter struct {
    http.ResponseWriter
    buf *bytes.Buffer
}

func (mrw *MyResponseWriter) Write(p []byte) (int, error) {
    return mrw.buf.Write(p)
}

Note that MyResponseWriter.Write() just writes the data to a buffer. You may also choose to inspect it on-the-fly (in the Write() method) and write the data immediately to the wrapped / embedded ResponseWriter. You may even modify the data. You have full control.

^{Care must be taken again though, as the subsequent handlers may also send HTTP response headers related to the response data –such as length or checksums– which may also become invalid if you alter the response data.}

Full example

Putting the pieces together, here's a full working example:

func loginmw(handler http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        body, err := ioutil.ReadAll(r.Body)
        if err != nil {
            log.Printf("Error reading body: %v", err)
            http.Error(w, "can't read body", http.StatusBadRequest)
            return
        }

        // Work / inspect body. You may even modify it!

        // And now set a new body, which will simulate the same data we read:
        r.Body = ioutil.NopCloser(bytes.NewBuffer(body))

        // Create a response wrapper:
        mrw := &MyResponseWriter{
            ResponseWriter: w,
            buf:            &bytes.Buffer{},
        }

        // Call next handler, passing the response wrapper:
        handler.ServeHTTP(mrw, r)

        // Now inspect response, and finally send it out:
        // (You can also modify it before sending it out!)
        if _, err := io.Copy(w, mrw.buf); err != nil {
            log.Printf("Failed to send out response: %v", err)
        }
    })
}

Validation for 10 digit mobile number and focus input field on invalid

function isMobileNumber(evt, sender) { // Allows only 10 numbers // ONKEYPRESS FUNCTION
//evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
var NumValue = $(sender).val();
if (charCode > 31 && (charCode < 48 || charCode > 57)) {//|| NumValue.length > 9) {
    return false;
}
return true;}


function isProperMobileNumber(txtMobId) { //// VALIDATOR FUNCTION   
var txtMobile = document.getElementById(txtMobId);
if (!isNumeric(txtMobile.value)) { $(txtMobile).css("border-color", "red"); return false; }
if (txtMobile.value.length < 10) {
    $(txtMobile).css("border-color", "red");
    return false;
}
$(txtMobile).css("border-color", "")
return true; }

function isNumeric(n) {
return !isNaN(parseFloat(n)) && isFinite(n) }

Remove portion of a string after a certain character

Why...

This is likely overkill for most people's needs, but, it addresses a number of things that each individual answer above does not. Of the items it addresses, three of them were needed for my needs. With tight bracketing and dropping the comments, this could still remain readable at only 13 lines of code.

This addresses the following:

Performance impact of using REGEX vs strrpos/strstr/strripos/stristr.
Using strripos/strrpos when character/string not found in string.
Removing from left or right side of string (first or last occurrence) .
CaSe Sensitivity.
Wanting the ability to return back the original string unaltered if search char/string not found.

Usage:

Send original string, search char/string, "R"/"L" for start on right or left side, true/false for case sensitivity. For example, search for "here" case insensitive, in string, start right side.

echo TruncStringAfterString("Now Here Are Some Words Here Now","here","R",false);

Output would be "Now Here Are Some Words ". Changing the "R" to an "L" would output: "Now ".

Here's the function:

function TruncStringAfterString($origString,$truncChar,$startSide,$caseSensitive)
{
    if ($caseSensitive==true && strstr($origString,$truncChar)!==false)
    {
        // IF START RIGHT SIDE:
        if (strtoupper($startSide)=="R" || $startSide==false)
        {   // Found, strip off all chars from truncChar to end
            return substr($origString,0,strrpos($origString,$truncChar));
        }

        // IF START LEFT SIDE: 
        elseif (strtoupper($startSide)=="L" || $startSide="" || $startSide==true)
        {   // Found, strip off all chars from truncChar to end
            return strstr($origString,$truncChar,true);
        }           
    }
    elseif ($caseSensitive==false && stristr($origString,$truncChar)!==false)
    {           
        // IF START RIGHT SIDE: 
        if (strtoupper($startSide)=="R" || $startSide==false)
        {   // Found, strip off all chars from truncChar to end
            return substr($origString,0,strripos($origString,$truncChar));
        }

        // IF START LEFT SIDE: 
        elseif (strtoupper($startSide)=="L" || $startSide="" || $startSide==true)
        {   // Found, strip off all chars from truncChar to end
            return stristr($origString,$truncChar,true);
        }
    }       
    else
    {   // NOT found - return origString untouched
        return $origString;     // Nothing to do here
    }           

}

Detecting when Iframe content has loaded (Cross browser)

to detect when the iframe has loaded and its document is ready?

It's ideal if you can get the iframe to tell you itself from a script inside the frame. For example it could call a parent function directly to tell it it's ready. Care is always required with cross-frame code execution as things can happen in an order you don't expect. Another alternative is to set ‘var isready= true;’ in its own scope, and have the parent script sniff for ‘contentWindow.isready’ (and add the onload handler if not).

If for some reason it's not practical to have the iframe document co-operate, you've got the traditional load-race problem, namely that even if the elements are right next to each other:

<img id="x" ... />
<script type="text/javascript">
    document.getElementById('x').onload= function() {
        ...
    };
</script>

there is no guarantee that the item won't already have loaded by the time the script executes.

The ways out of load-races are:

on IE, you can use the ‘readyState’ property to see if something's already loaded;
if having the item available only with JavaScript enabled is acceptable, you can create it dynamically, setting the ‘onload’ event function before setting source and appending to the page. In this case it cannot be loaded before the callback is set;
the old-school way of including it in the markup:

<img onload="callback(this)" ... />

Inline ‘onsomething’ handlers in HTML are almost always the wrong thing and to be avoided, but in this case sometimes it's the least bad option.

What is android:ems attribute in Edit Text?

An "em" is a typographical unit of width, the width of a wide-ish letter like "m" pronounced "em". Similarly there is an "en". Similarly "en-dash" and "em-dash" for – and —

-Tim Bray

How to make Python script run as service?

for my script of python, I use...

To START python script :

start-stop-daemon --start --background --pidfile $PIDFILE --make-pidfile --exec $DAEMON

To STOP python script :

PID=$(cat $PIDFILE)
kill -9 $PID
rm -f $PIDFILE

P.S.: sorry for poor English, I'm from CHILE :D

Convert a timedelta to days, hours and minutes

I don't understand

days, hours, minutes = td.days, td.seconds // 3600, td.seconds // 60 % 60

how about this

days, hours, minutes = td.days, td.seconds // 3600, td.seconds % 3600 / 60.0

You get minutes and seconds of a minute as a float.

How to check encoding of a CSV file

In Python, You can Try...

from encodings.aliases import aliases
alias_values = set(aliases.values())

for encoding in set(aliases.values()):
    try:
        df=pd.read_csv("test.csv", encoding=encoding)
        print('successful', encoding)
    except:
        pass

Put quotes around a variable string in JavaScript

This can be one of several solutions:

var text = "http://example.com";

JSON.stringify(text).replace('\"', '\"\'').replace(/.$/, '\'"')

What is a loop invariant?

In Linear Search (as per exercise given in book), we need to find value V in given array.

Its simple as scanning the array from 0 <= k < length and comparing each element. If V found, or if scanning reaches length of array, just terminate the loop.

As per my understanding in above problem-

Loop Invariants(Initialization): V is not found in k - 1 iteration. Very first iteration, this would be -1 hence we can say V not found at position -1

Maintainance: In next iteration,V not found in k-1 holds true

Terminatation: If V found in k position or k reaches the length of the array, terminate the loop.

How to set cursor position in EditText?

You can use like this:

if (your_edittext.getText().length() > 0 ) {

    your_edittext.setSelection(your_edittext.getText().length());
}

Can you add this line to your EditText xml

android:gravity="right"
android:ellipsize="end"
android:paddingLeft="10dp"//you set this as you need

But when any Text writing you should set the paddingleft to zero

you should use this on addTextChangedListener

Backbone.js fetch with parameters

Another example if you are using Titanium Alloy:

 collection.fetch({ 
     data: {
             where : JSON.stringify({
                page: 1
             })
           } 
      });

Get a list of dates between two dates using a function

SELECT  dateadd(dd,DAYS,'2013-09-07 00:00:00') DATES
INTO        #TEMP1
FROM
(SELECT TOP 365 colorder - 1 AS DAYS from master..syscolumns 
    WHERE id = -519536829 order by colorder) a

WHERE datediff(dd,dateadd(dd,DAYS,'2013-09-07 00:00:00'),'2013-09-13 00:00:00' ) >= 0 
    AND  dateadd(dd,DAYS,'2013-09-07 00:00:00') <=  '2013-09-13 00:00:00'  
    SELECT * FROM #TEMP1

How to create two columns on a web page?

I found a real cool Grid which I also use for columns. Check it out Simple Grid. Wich this CSS you can simply use:

<div class="grid">
    <div class="col-1-2">
       <div class="content">
           <p>...insert content left side...</p>
       </div>
    </div>
    <div class="col-1-2">
       <div class="content">
           <p>...insert content right side...</p>
       </div>
    </div>
</div>

I use it for all my projects.

How can I run Tensorboard on a remote server?

While running the tensorboard give one more option --host=ip of your system and then you can access it from other system using http://ip of your host system:6006

Show image using file_get_contents

Do i need to modify the headers and just echo it or something?

exactly.

Send a header("content-type: image/your_image_type"); and the data afterwards.

How to convert IPython notebooks to PDF and HTML?

If you have LaTeX installed you can download as PDF directly from Jupyter notebook with File -> Download as -> PDF via LaTeX (.pdf). Otherwise follow these two steps.

For HTML output, you should now use Jupyter in place of IPython and select File -> Download as -> HTML (.html) or run the following command:
```
jupyter nbconvert --to html notebook.ipynb  
```
This will convert the Jupyter document file notebook.ipynb into the html output format.

Google Colaboratory is Google's free Jupyter notebook environment that requires no setup and runs entirely in the cloud. If you are using Google Colab the commands are the same, but Google Colab only lets you download .ipynb or .py formats.
Convert the html file notebook.html into a pdf file called notebook.pdf. In Windows, Mac or Linux, install wkhtmltopdf. wkhtmltopdf is a command line utility to convert html to pdf using WebKit. You can download wkhtmltopdf from the linked webpage, or in many Linux distros it can be found in their repositories.
```
wkhtmltopdf notebook.html notebook.pdf   
```

_{Original (now almost obsolete) revision: Convert the IPython notebook file to html.}

^{ipython nbconvert --to html notebook.ipynb}

Paging UICollectionView by cells, not screen

You can use the following library: https://github.com/ink-spot/UPCarouselFlowLayout

It's very simple and ofc you do not need to think about details like other answers contain.

android edittext onchange listener

Anyone using ButterKnife. You can use like:

@OnTextChanged(R.id.zip_code)
void onZipCodeTextChanged(CharSequence zipCode, int start, int count, int after) {

}

Remove ALL styling/formatting from hyperlinks

if you state a.redLink{color:red;} then to keep this on hover and such add a.redLink:hover{color:red;} This will make sure no other hover states will change the color of your links

How to convert string to datetime format in pandas python?

Use to_datetime, there is no need for a format string the parser is man/woman enough to handle it:

In [51]:
pd.to_datetime(df['I_DATE'])

Out[51]:
0   2012-03-28 14:15:00
1   2012-03-28 14:17:28
2   2012-03-28 14:50:50
Name: I_DATE, dtype: datetime64[ns]

To access the date/day/time component use the dt accessor:

In [54]:
df['I_DATE'].dt.date

Out[54]:
0    2012-03-28
1    2012-03-28
2    2012-03-28
dtype: object

In [56]:    
df['I_DATE'].dt.time

Out[56]:
0    14:15:00
1    14:17:28
2    14:50:50
dtype: object

You can use strings to filter as an example:

In [59]:
df = pd.DataFrame({'date':pd.date_range(start = dt.datetime(2015,1,1), end = dt.datetime.now())})
df[(df['date'] > '2015-02-04') & (df['date'] < '2015-02-10')]

Out[59]:
         date
35 2015-02-05
36 2015-02-06
37 2015-02-07
38 2015-02-08
39 2015-02-09

Format specifier %02x

Your string is wider than your format width of 2. So there's no padding to be done.

What does "Content-type: application/json; charset=utf-8" really mean?

To substantiate @deceze's claim that the default JSON encoding is UTF-8...

From IETF RFC4627:

JSON text SHALL be encoded in Unicode. The default encoding is UTF-8.

Since the first two characters of a JSON text will always be ASCII characters [RFC0020], it is possible to determine whether an octet stream is UTF-8, UTF-16 (BE or LE), or UTF-32 (BE or LE) by looking at the pattern of nulls in the first four octets.
      00 00 00 xx  UTF-32BE
      00 xx 00 xx  UTF-16BE
      xx 00 00 00  UTF-32LE
      xx 00 xx 00  UTF-16LE
      xx xx xx xx  UTF-8

Determine function name from within that function (without using traceback)

functionNameAsString = sys._getframe().f_code.co_name

I wanted a very similar thing because I wanted to put the function name in a log string that went in a number of places in my code. Probably not the best way to do that, but here's a way to get the name of the current function.

Unable to import path from django.urls

It look's as if you forgot to activate you virtual environment try running python3 -m venv venv or if you already have virtual environment set up try to activate it by running source venv/bin/activate

PHP cURL error code 60

Problem fixed, download https://curl.haxx.se/ca/cacert.pem and put it "somewhere", and add this line in php.ini :

curl.cainfo = "C:/somewhere/cacert.pem"

PS: I got this error by trying to install module on drupal with xampp.

How to adjust layout when soft keyboard appears

Add this line into Manifiest File:

android:windowSoftInputMode="adjustResize"

How can I open a URL in Android's web browser from my application?

Try this..Worked for me!

    public void webLaunch(View view) {
            WebView myWebView = (WebView) findViewById(R.id.webview);
            myWebView.setVisibility(View.VISIBLE);
            View view1=findViewById(R.id.recharge);
            view1.setVisibility(View.GONE);
            myWebView.getSettings().setJavaScriptEnabled(true);
            myWebView.loadUrl("<your link>");

        }

xml code :-

 <WebView  xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/webview"
        android:visibility="gone"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />

--------- OR------------------

String url = "";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);

How to convert Hexadecimal #FFFFFF to System.Drawing.Color

You can do

var color =  System.Drawing.ColorTranslator.FromHtml("#FFFFFF");

Or this (you will need the System.Windows.Media namespace)

var color = (Color)ColorConverter.ConvertFromString("#FFFFFF");

Iterate over elements of List and Map using JSTL <c:forEach> tag

Mark, this is already answered in your previous topic. But OK, here it is again:

Suppose ${list} points to a List<Object>, then the following

<c:forEach items="${list}" var="item">
    ${item}<br>
</c:forEach>

does basically the same as as following in "normal Java":

for (Object item : list) {
    System.out.println(item);
}

If you have a List<Map<K, V>> instead, then the following

<c:forEach items="${list}" var="map">
    <c:forEach items="${map}" var="entry">
        ${entry.key}<br>
        ${entry.value}<br>
    </c:forEach>
</c:forEach>

does basically the same as as following in "normal Java":

for (Map<K, V> map : list) {
    for (Entry<K, V> entry : map.entrySet()) {
        System.out.println(entry.getKey());
        System.out.println(entry.getValue());
    }
}

The key and value are here not special methods or so. They are actually getter methods of Map.Entry object (click at the blue Map.Entry link to see the API doc). In EL (Expression Language) you can use the . dot operator to access getter methods using "property name" (the getter method name without the get prefix), all just according the Javabean specification.

That said, you really need to cleanup the "answers" in your previous topic as they adds noise to the question. Also read the comments I posted in your "answers".

How to install JQ on Mac by command-line?

For CentOS, RHEL, Amazon Linux: sudo yum install jq

How to make sure that a certain Port is not occupied by any other process

It's netstat -ano|findstr port no

Result would show process id in last column

How to get DropDownList SelectedValue in Controller in MVC

1st Approach (via Request or FormCollection):

You can read it from Request using Request.Form , your dropdown name is ddlVendor so pass ddlVendor key in the formCollection to get its value that is posted by form:

string strDDLValue = Request.Form["ddlVendor"].ToString();

or Use FormCollection:

[HttpPost]
public ActionResult ShowAllMobileDetails(MobileViewModel MV,FormCollection form)
{           
  string strDDLValue = form["ddlVendor"].ToString();

  return View(MV);
}

2nd Approach (Via Model):

If you want with Model binding then add a property in Model:

public class MobileViewModel 
{          
    public List<tbInsertMobile> MobileList;
    public SelectList Vendor { get; set; }
    public string SelectedVendor {get;set;}
}

and in View:

@Html.DropDownListFor(m=>m.SelectedVendor , Model.Vendor, "Select Manufacurer")

and in Action:

[HttpPost]
public ActionResult ShowAllMobileDetails(MobileViewModel MV)
{           
   string SelectedValue = MV.SelectedVendor;
   return View(MV);
}

UPDATE:

If you want to post the text of selected item as well, you have to add a hidden field and on drop down selection change set selected item text in the hidden field:

public class MobileViewModel 
{          
    public List<tbInsertMobile> MobileList;
    public SelectList Vendor { get; set; }
    public string SelectVendor {get;set;}
    public string SelectedvendorText { get; set; }
}

use jquery to set hidden field:

<script type="text/javascript">
$(function(){
$("#SelectedVendor").on("change", function {
   $("#SelectedvendorText").val($(this).text());
 });
});
</script>

@Html.DropDownListFor(m=>m.SelectedVendor , Model.Vendor, "Select Manufacurer")
@Html.HiddenFor(m=>m.SelectedvendorText)

How to achieve function overloading in C?

Try to declare these functions as extern "C++" if your compiler supports this, http://msdn.microsoft.com/en-us/library/s6y4zxec(VS.80).aspx

Using multiple property files (via PropertyPlaceholderConfigurer) in multiple projects/modules

I tried the solution below, it works on my machine.

<context:property-placeholder location="classpath*:connection.properties" ignore-unresolvable="true" order="1" />

<context:property-placeholder location="classpath*:general.properties" order="2"/>

In case multiple elements are present in the Spring context, there are a few best practices that should be followed:

the order attribute needs to be specified to fix the order in which these are processed by Spring all property placeholders minus the last one (highest order) should have ignore-unresolvable=”true” to allow the resolution mechanism to pass to others in the context without throwing an exception

source: http://www.baeldung.com/2012/02/06/properties-with-spring/

Objective-C - Remove last character from string

If it's an NSMutableString (which I would recommend since you're changing it dynamically), you can use:

[myString deleteCharactersInRange:NSMakeRange([myRequestString length]-1, 1)];

Programs & Examples On #Preg match

How to search in an array with preg_match?

PHP preg_match - only allow alphanumeric strings and - _ characters

PHP is_numeric or preg_match 0-9 validation

Delimiter must not be alphanumeric or backslash and preg_match

Regular expression containing one word or another

PHP regular expressions: No ending delimiter '^' found in

Regex: Specify "space or start of string" and "space or end of string"

PHP - regex to allow letters and numbers only

Preg_match backtrack error

Express: How to pass app-instance to routes from a different file?

Why is document.body null in my javascript?

Excel VBA Check if directory exists error

Generating CSV file for Excel, how to have a newline inside a value

JavaScript validation for empty input field

How can I change the text color with jQuery?

What killed my process and why?

Let me first explain when and why OOMKiller get invoked?

Where can I find logs of OOMKiller?

Some typical solutions:

How to count check-boxes using jQuery?

Cannot deserialize the JSON array (e.g. [1,2,3]) into type ' ' because type requires JSON object (e.g. {"name":"value"}) to deserialize correctly

bootstrap 4 file input doesn't show the file name

Converting a JS object to an array using jQuery

How to make a section of an image a clickable link

Vue.js data-bind style backgroundImage not working

What is the difference between & vs @ and = in angularJS

Printing result of mysql query from variable

Can table columns with a Foreign Key be NULL?

How to open PDF file in a new tab or window instead of downloading it (using asp.net)?

How to use vim in the terminal?

Get started quickly

Configure vim to your liking

Further learning

How do I make the scrollbar on a div only visible when necessary?

Maximum size for a SQL Server Query? IN clause? Is there a Better Approach

How to do select from where x is equal to multiple values?

How to get mouse position in jQuery without mouse-events?

How to check if a value exists in a dictionary (python)

How to resolve Error : Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation

Mysql 1050 Error "Table already exists" when in fact, it does not

Making an svg image object clickable with onclick, avoiding absolute positioning

How can I mimic the bottom sheet from the Maps app?

Example

Configure MapViewController

Configure BottomSheetViewController

1) Prepare background

2) Animate bottomSheet appearance

3) Modify your xib as you want.

4) Add Pan Gesture Recognizer to your view.

Scrollable Bottom Sheet:

Sample Project

Sample Project Screenshots

- Partial View

- FullView

- Scrollable View

show dbs gives "Not Authorized to execute command" error

Java SimpleDateFormat for time zone with a colon separator?

tl;dr

Details

java.time

ISO 8601

OffsetDateTime

Time Zone

Generating strings

Converting to java.util.Date

About java.time

How to install Android Studio on Ubuntu?

Convert XML String to Object

Take a full page screenshot with Firefox on the command-line

How can I debug git/git-shell related problems?

Debugging

SSH

Examples

Access mysql remote database from command line

How to pass objects to functions in C++?

Generating a random hex color code with PHP

How To Change DataType of a DataColumn in a DataTable?

How to change Navigation Bar color in iOS 7?

Make a dictionary with duplicate keys in Python

`OffsetDateTime`

Converting to `java.util.Date`