Export html table data to Excel using JavaScript / JQuery is not working properly in chrome browser

This could help

function exportToExcel(){
var htmls = "";
            var uri = 'data:application/vnd.ms-excel;base64,';
            var template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>'; 
            var base64 = function(s) {
                return window.btoa(unescape(encodeURIComponent(s)))
            };

            var format = function(s, c) {
                return s.replace(/{(\w+)}/g, function(m, p) {
                    return c[p];
                })
            };

            htmls = "YOUR HTML AS TABLE"

            var ctx = {
                worksheet : 'Worksheet',
                table : htmls
            }


            var link = document.createElement("a");
            link.download = "export.xls";
            link.href = uri + base64(format(template, ctx));
            link.click();
}

How to print table using Javascript?

My fellows,

In January 2019 I used a code made before:

 <script type="text/javascript">   
    function imprimir() {
        var divToPrint=document.getElementById("ConsutaBPM");
        newWin= window.open("");
        newWin.document.write(divToPrint.outerHTML);
        newWin.print();
        newWin.close();
    }
</script>

To undestand: ConsutaBPM is a DIV which contains inside phrases and tables. I wanted to print ALL, titles, table, and others. The problem was when TRIED to print the TABLE...

The table mas be defined with BORDER and CELLPADDING:

<table border='1' cellpadding='1' id='Tablbpm1' >

It worked fine!!!

How to submit a form using PhantomJS

Sending raw POST requests can be sometimes more convenient. Below you can see post.js original example from PhantomJS

// Example using HTTP POST operation

var page = require('webpage').create(),
    server = 'http://posttestserver.com/post.php?dump',
    data = 'universe=expanding&answer=42';

page.open(server, 'post', data, function (status) {
    if (status !== 'success') {
        console.log('Unable to post!');
    } else {
        console.log(page.content);
    }
    phantom.exit();
});

Get selected element's outer HTML

2014 Edit : The question and this reply are from 2010. At the time, no better solution was widely available. Now, many of the other replies are better : Eric Hu's, or Re Capcha's for example.

This site seems to have a solution for you : jQuery: outerHTML | Yelotofu

jQuery.fn.outerHTML = function(s) {
    return s
        ? this.before(s).remove()
        : jQuery("<p>").append(this.eq(0).clone()).html();
};

Get the string representation of a DOM node

I've found that for my use-cases I don't always want the entire outerHTML. Many nodes just have too many children to show.

Here's a function (minimally tested in Chrome):

/**
 * Stringifies a DOM node.
 * @param {Object} el - A DOM node.
 * @param {Number} truncate - How much to truncate innerHTML of element.
 * @returns {String} - A stringified node with attributes
 *                     retained.
 */
function stringifyEl(el, truncate) {
    var truncateLen = truncate || 50;
    var outerHTML = el.outerHTML;
    var ret = outerHTML;
    ret = ret.substring(0, truncateLen);

    // If we've truncated, add an elipsis.
    if (outerHTML.length > truncateLen) {
      ret += "...";
    }
    return ret;
}

https://gist.github.com/kahunacohen/467f5cc259b5d4a85eb201518dcb15ec

How can Print Preview be called from Javascript?

I think the best that's possible in cross-browser JavaScript is window.print(), which (in Firefox 3, for me) brings up the 'print' dialog and not the print preview dialog.

FYI, the print dialog is your computer's Print popup, what you get when you do Ctrl-p. The print preview is Firefox's own Preview window, and it has more options. It's what you get with Firefox Menu > Print...

How to use PHP OPCache?

I am going to drop in my two cents for what I use opcache.

I have made an extensive framework with a lot of fields and validation methods and enums to be able to talk to my database.

Without opcache

When using this script without opcache and I push 9000 requests in 2.8 seconds to the apache server it maxes out at 90-100% cpu for 70-80 seconds until it catches up with all the requests.

Total time taken: 76085 milliseconds(76 seconds)

With opcache enabled

With opcache enabled it runs at 25-30% cpu time for about 25 seconds and never passes 25% cpu use.

Total time taken: 26490 milliseconds(26 seconds)

I have made an opcache blacklist file to disable the caching of everything except the framework which is all static and doesnt need changing of functionality. I choose explicitly for just the framework files so that I could develop without worrying about reloading/validating the cache files. Having everything cached saves a second on the total of the requests 25546 milliseconds

This significantly expands the amount of data/requests I can handle per second without the server even breaking a sweat.

How to send data to COM PORT using JAVA?

This question has been asked and answered many times:

Read file from serial port using Java

Reading serial port in Java

Reading file from serial port in Java

Is there Java library or framework for accessing Serial ports?

Java Serial Communication on Windows

to reference a few.

Personally I recommend SerialPort from http://serialio.com - ~~it's not free, but it's well worth the developer (no royalties) licensing fee for any commercial project~~. Sadly, it is no longer royalty free to deploy, and SerialIO.com seems to have remade themselves as a hardware seller; I had to search for information on SerialPort.

From personal experience, I strongly recommend against the Sun, IBM and RxTx implementations, all of which were unstable in 24/7 use. Refer to my answers on some of the aforementioned questions for details. To be perfectly fair, RxTx may have come a long way since I tried it, though the Sun and IBM implementations were essentially abandoned, even back then.

A newer free option that looks promising and may be worth trying is jSSC (Java Simple Serial Connector), as suggested by @Jodes comment.

Why is Java's SimpleDateFormat not thread-safe?

If you want to use the same date format among multiple threads, declare it as a static and synchronize on the instance variable when using it...

static private SimpleDateFormat sdf = new SimpleDateFormat("....");

synchronized(sdf)
{
   // use the instance here to format a date
}


// The above makes it thread safe

ADB Driver and Windows 8.1

In Windows 7, 8 or 8.1, in Devices Manager:

Select tree 'Android Device': remove 'Android Composite ADB Interface' [?]
Press on main root of devices tree and call context menu (by right mouse click) and click on 'Update configuration'
After updating your device should appear in 'Other devices'
Select your device, call context menu from it and choose 'Update driver' and perform this updating

How is the default max Java heap size determined?

Java 8 takes more than 1/64th of your physical memory for your Xmssize (Minimum HeapSize) and less than 1/4th of your physical memory for your -Xmxsize (Maximum HeapSize).

You can check the default Java heap size by:

In Windows:

java -XX:+PrintFlagsFinal -version | findstr /i "HeapSize PermSize ThreadStackSize"

In Linux:

java -XX:+PrintFlagsFinal -version | grep -iE 'HeapSize|PermSize|ThreadStackSize'

What system configuration settings influence the default value?

The machine's physical memory & Java version.

Ignoring NaNs with str.contains

import folium
import pandas

data= pandas.read_csv("maps.txt")

lat = list(data["latitude"])
lon = list(data["longitude"])

map= folium.Map(location=[31.5204, 74.3587], zoom_start=6, tiles="Mapbox Bright")

fg = folium.FeatureGroup(name="My Map")

for lt, ln in zip(lat, lon):
c1 = fg.add_child(folium.Marker(location=[lt, ln], popup="Hi i am a Country",icon=folium.Icon(color='green')))

child = fg.add_child(folium.Marker(location=[31.5204, 74.5387], popup="Welcome to Lahore", icon= folium.Icon(color='green')))

map.add_child(fg)

map.save("Lahore.html")


Traceback (most recent call last):
  File "C:\Users\Ryan\AppData\Local\Programs\Python\Python36-32\check2.py", line 14, in <module>
    c1 = fg.add_child(folium.Marker(location=[lt, ln], popup="Hi i am a Country",icon=folium.Icon(color='green')))
  File "C:\Users\Ryan\AppData\Local\Programs\Python\Python36-32\lib\site-packages\folium\map.py", line 647, in __init__
    self.location = _validate_coordinates(location)
  File "C:\Users\Ryan\AppData\Local\Programs\Python\Python36-32\lib\site-packages\folium\utilities.py", line 48, in _validate_coordinates
    'got:\n{!r}'.format(coordinates))
ValueError: Location values cannot contain NaNs, got:
[nan, nan]

Why does fatal error "LNK1104: cannot open file 'C:\Program.obj'" occur when I compile a C++ project in Visual Studio?

I run into the same problem with linker complaining about the main executable missing. This happened during our solution port to the new Visual Studio 2013. The solution is a varied mix of managed and un-managed projects/code. The problem (and fix) ended up being a missing app.config file in the solution folder. Took a day to figure this one out :(, as output log was not very helpful.

Stop Powershell from exiting

Python safe method to get value of nested dictionary

You could use get twice:

example_dict.get('key1', {}).get('key2')

This will return None if either key1 or key2 does not exist.

Note that this could still raise an AttributeError if example_dict['key1'] exists but is not a dict (or a dict-like object with a get method). The try..except code you posted would raise a TypeError instead if example_dict['key1'] is unsubscriptable.

Another difference is that the try...except short-circuits immediately after the first missing key. The chain of get calls does not.

If you wish to preserve the syntax, example_dict['key1']['key2'] but do not want it to ever raise KeyErrors, then you could use the Hasher recipe:

class Hasher(dict):
    # https://stackoverflow.com/a/3405143/190597
    def __missing__(self, key):
        value = self[key] = type(self)()
        return value

example_dict = Hasher()
print(example_dict['key1'])
# {}
print(example_dict['key1']['key2'])
# {}
print(type(example_dict['key1']['key2']))
# <class '__main__.Hasher'>

Note that this returns an empty Hasher when a key is missing.

Since Hasher is a subclass of dict you can use a Hasher in much the same way you could use a dict. All the same methods and syntax is available, Hashers just treat missing keys differently.

You can convert a regular dict into a Hasher like this:

hasher = Hasher(example_dict)

and convert a Hasher to a regular dict just as easily:

regular_dict = dict(hasher)

Another alternative is to hide the ugliness in a helper function:

def safeget(dct, *keys):
    for key in keys:
        try:
            dct = dct[key]
        except KeyError:
            return None
    return dct

So the rest of your code can stay relatively readable:

safeget(example_dict, 'key1', 'key2')

MySQL config file location - redhat linux server

The information you want can be found by running

mysql --help

mysqld --help --verbose

I tried this :

    mysql --help | grep Default -A 1

And the output:

                      (Defaults to on; use --skip-auto-rehash to disable.)
  -A, --no-auto-rehash 
--
                      (Defaults to on; use --skip-line-numbers to disable.)
  -L, --skip-line-numbers 
--
                      (Defaults to on; use --skip-column-names to disable.)
  -N, --skip-column-names 
--
                      (Defaults to on; use --skip-reconnect to disable.)
  -s, --silent        Be more silent. Print results with a tab as separator,
--
  --default-auth=name Default authentication client-side plugin to use.
  --binary-mode       By default, ASCII '\0' is disallowed and '\r\n' is
--
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf

Execute curl command within a Python script

Use this tool (hosted here for free) to convert your curl command to equivalent Python requests code:

Example: This,

curl 'https://www.example.com/' -H 'Connection: keep-alive' -H 'Cache-Control: max-age=0' -H 'Origin: https://www.example.com' -H 'Accept-Encoding: gzip, deflate, br' -H 'Cookie: SESSID=ABCDEF' --data-binary 'Pathfinder' --compressed

Gets converted neatly to:

import requests

cookies = {
    'SESSID': 'ABCDEF',
}

headers = {
    'Connection': 'keep-alive',
    'Cache-Control': 'max-age=0',
    'Origin': 'https://www.example.com',
    'Accept-Encoding': 'gzip, deflate, br',
}

data = 'Pathfinder'

response = requests.post('https://www.example.com/', headers=headers, cookies=cookies, data=data)

Delimiter must not be alphanumeric or backslash and preg_match

Maybe not related to original code example, but I received the error "Delimiter must not be alphanumeric or backslash" and Googled here. Reason: I mixed order of parameters for preg_match. Pattern was the second parameter and string to match was first. Be careful :)

Is null check needed before calling instanceof?

Just as a tidbit:

Even (((A)null)instanceof A) will return false.

(If typecasting null seems surprising, sometimes you have to do it, for example in situations like this:

public class Test
{
  public static void test(A a)
  {
    System.out.println("a instanceof A: " + (a instanceof A));
  }

  public static void test(B b) {
    // Overloaded version. Would cause reference ambiguity (compile error)
    // if Test.test(null) was called without casting.
    // So you need to call Test.test((A)null) or Test.test((B)null).
  }
}

So Test.test((A)null) will print a instanceof A: false.)

P.S.: If you are hiring, please don't use this as a job interview question. :D

Set bootstrap modal body height by percentage

This worked for me

.modal-dialog,
.modal-content {
    /* 80% of window height */
    height: 80%;
}

.modal-body {
    /* 100% = dialog height, 120px = header + footer */
    max-height: calc(100% - 120px);
    overflow-y: scroll;
}

Fiddle: http://jsfiddle.net/mehmetatas/18dpgqpb/2/

Darken background image on hover

.image:hover {
   background: #000;
    width: 58px;
    height: 58px;
    border-radius:60px;

}

You will get darken

How to replace item in array?

To replace the second element in the array

arr = [1, 7, 9]

with the value 8

arr[1] = 8

Replacing a fragment with another fragment inside activity group

you can use simple code its work for transaction

Fragment newFragment = new MainCategoryFragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame_NavButtom, newFragment);
ft.commit();

Overloading operators in typedef structs (c++)

bool operator==(pos a) const{ - this method doesn't change object's elements.
bool operator==(pos a) { - it may change object's elements.

How to show what a commit did?

This is one way I know of. With git, there always seems to be more than one way to do it.

git log -p commit1 commit2

Compare dates with javascript

Because of your date format, you can use this code:

if(parseInt(first.replace(/-/g,""),10) > parseInt(second.replace(/-/g,""),10)){
   //...
}

It will check whether 20121121 number is bigger than 20121103 or not.

Best way to import Observable from rxjs

Update for RxJS 6 (April 2018)

It is now perfectly fine to import directly from rxjs. (As can be seen in Angular 6+). Importing from rxjs/operators is also fine and it is actually no longer possible to import operators globally (one of major reasons for refactoring rxjs 6 and the new approach using pipe). Thanks to this treeshaking can now be used as well.

Sample code from rxjs repo:

import { Observable, Subject, ReplaySubject, from, of, range } from 'rxjs';
import { map, filter, switchMap } from 'rxjs/operators';

range(1, 200)
  .pipe(filter(x => x % 2 === 1), map(x => x + x))
  .subscribe(x => console.log(x));

Backwards compatibility for rxjs < 6?

rxjs team released a compatibility package on npm that is pretty much install & play. With this all your rxjs 5.x code should run without any issues. This is especially useful now when most of the dependencies (i.e. modules for Angular) are not yet updated.

Get week number (in the year) from a date PHP

To get the week number for a date in North America I do like this:

function week_number($n)
{
    $w = date('w', $n);
    return 1 + date('z', $n + (6 - $w) * 24 * 3600) / 7;
}

$n = strtotime('2022-12-27');
printf("%s: %d\n", date('D Y-m-d', $n), week_number($n));

and get:

Tue 2022-12-27: 53

Boto3 Error: botocore.exceptions.NoCredentialsError: Unable to locate credentials

I just had this problem. This is what worked for me:

pip install botocore==1.13.20

Source: https://github.com/boto/botocore/issues/1892

How to get integer values from a string in Python?

An answer taken from ChristopheD here: https://stackoverflow.com/a/2500023/1225603

r = "456results string789"
s = ''.join(x for x in r if x.isdigit())
print int(s)
456789

Get path from open file in Python

And if you just want to get the directory name and no need for the filename coming with it, then you can do that in the following conventional way using os Python module.

>>> import os
>>> f = open('/Users/Desktop/febROSTER2012.xls')
>>> os.path.dirname(f.name)
>>> '/Users/Desktop/'

This way you can get hold of the directory structure.

How to reference a file for variables using Bash?

The script containing variables can be executed imported using bash. Consider the script-variable.sh

#!/bin/sh
scr-var=value

Consider the actual script where the variable will be used :

 #!/bin/sh
 bash path/to/script-variable.sh
 echo "$scr-var"

CMAKE_MAKE_PROGRAM not found

I’ve just solved the same problem. I had MinGW with GCC and G++ installed but not make. This command helped me:

mingw-get.exe install mingw32-make

After running it, clear CMake cache (delete the CMakeCache.txt file in the CMake's working directory) and run CMake again.

Access restriction: Is not accessible due to restriction on required library ..\jre\lib\rt.jar

Go to Buildpath

Remove Existing JRE and add new JRE library which contain Jdk1.6 and finish Now clean all project and build again

I think this way you can resolved your error

how to measure running time of algorithms in python

The programming language doesn't matter; measuring the runtime complexity of an algorithm works the same way regardless of the language. Analysis of Algorithms by Stanford on Google Code University is a very good resource for teaching yourself how to analyze the runtime complexity of algorithms and code.

If all you want to do is measure the elapsed time that a function or section of code took to run in Python, then you can use the timeit or time modules, depending on how long the code needs to run.

Cookies on localhost with explicit domain

None of the answers here worked for me. I fixed it by putting my PHP as the very very first thing in the page.

Like other headers, cookies must be sent before any output from your script (this is a protocol restriction). This requires that you place calls to this function prior to any output, including and tags as well as any whitespace.

From http://php.net/manual/en/function.setcookie.php

Bootstrap modal - close modal when "call to action" button is clicked

I tried closing a modal window with a bootstrap CSS loaded. The close () method does not really close the modal window. So I added the display style to "none".

    function closeDialog() {
        let d = document.getElementById('d')
        d.style.display = "none"
        d.close()
    }

The HTML code includes a button into the dialog window.

<input type="submit" value="Confirm" onclick="closeDialog()"/>

Installing J2EE into existing eclipse IDE

Go to Help -> Install new softwares-> add -> paste this link in location box http://download.eclipse.org/webtools/repository/luna/ install all new versions..

How to abort an interactive rebase if --abort doesn't work?

Try to follow the advice you see on the screen, and first reset your master's HEAD to the commit it expects.

git update-ref refs/heads/master b918ac16a33881ce00799bea63d9c23bf7022d67

Then, abort the rebase again.

copy all files and folders from one drive to another drive using DOS (command prompt)

Use xcopy /s I:\*.* N:\

This is should do.

Apache Proxy: No protocol handler was valid

In my case, all modules were correctly set up (https://www.digitalocean.com/community/tutorials/how-to-use-apache-http-server-as-reverse-proxy-using-mod_proxy-extension is a good starter) & I had the redirection working for a base url, let's say /mysite/ but I got the errors for any child ULR, let's say /mysite/login/

http://reverse-proxy.dns.com/mysite/ was properly redirected to the remote servers while http://reverse-proxy.dns.com/mysite/login/ failed at the Apache2 reverse proxying with OP's error message.

The issue was the ending / character in the proxypass directive "/mysite/". Working configuration for child URL is :

<Proxy balancer://mysite_cluster>
    BalancerMember http://192.x.x.10:8080/mysite
    BalancerMember http://192.x.x.11:8080/mysite
</Proxy>
<VirtualHost *:80>
    [...]
    ProxyRequests Off
    ProxyPreserveHost On
    ProxyPass "/mysite" "balancer://mysite_cluster"
    ProxyPassReverse "/mysite" "balancer://mysite_cluster"       
</VirtualHost>

Trailing / truly are tricky.

Center HTML Input Text Field Placeholder

you can use also this way to write css for placeholder

input::placeholder{
   text-align: center;
}

How to verify if a file exists in a batch file?

Type IF /? to get help about if, it clearly explains how to use IF EXIST.

To delete a complete tree except some folders, see the answer of this question: Windows batch script to delete everything in a folder except one

Finally copying just means calling COPY and calling another bat file can be done like this:

MYOTHERBATFILE.BAT sync.bat myprogram.ini

Android: how to hide ActionBar on certain activities

If you were using Theme.AppCompat.Light, a better equivalent would be Theme.AppCompat.Light.NoActionBar.

I found that using Theme.AppCompat.NoTitleBar caused my button text to be invisible so I am using Theme.AppCompat.Light.NoActionBar.

<activity android:name=".Activity"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.AppCompat.Light.NoActionBar">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

Definitive way to trigger keypress events with jQuery

If you want to trigger the keypress or keydown event then all you have to do is:

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

Convert UTC to local time in Rails 3

It is easy to configure it using your system local zone, Just in your application.rb add this

config.time_zone = Time.now.zone

Then, rails should show you timestamps in your localtime or you can use something like this instruction to get the localtime

Post.created_at.localtime

Alternate background colors for list items

This is set background color on even and odd li:

  li:nth-child(odd) { background: #ffffff; }
  li:nth-child(even) { background: #80808030; }

Vue is not defined

Sometimes the problem may be if you import that like this:

const Vue = window.vue;

this may overwrite the original Vue reference.

How to get the category title in a post in Wordpress?

Use get_the_category() like this:

<?php
foreach((get_the_category()) as $category) { 
    echo $category->cat_name . ' '; 
} 
?>

It returns a list because a post can have more than one category.

The documentation also explains how to do this from outside the loop.

How to convert jsonString to JSONObject in Java

you must import org.json

JSONObject jsonObj = null;
        try {
            jsonObj = new JSONObject("{\"phonetype\":\"N95\",\"cat\":\"WP\"}");
        } catch (JSONException e) {
            e.printStackTrace();
        }

How to add property to object in PHP >= 5.3 strict mode without generating error

If you absolutely have to add the property to the object, I believe you could cast it as an array, add your property (as a new array key), then cast it back as an object. The only time you run into stdClass objects (I believe) is when you cast an array as an object or when you create a new stdClass object from scratch (and of course when you json_decode() something - silly me for forgetting!).

Instead of:

$foo = new StdClass();
$foo->bar = '1234';

You'd do:

$foo = array('bar' => '1234');
$foo = (object)$foo;

Or if you already had an existing stdClass object:

$foo = (array)$foo;
$foo['bar'] = '1234';
$foo = (object)$foo;

Also as a 1 liner:

$foo = (object) array_merge( (array)$foo, array( 'bar' => '1234' ) );

How to get the background color code of an element in hex?

Check example link below and click on the div to get the color value in hex.

_x000D_

var color = '';_x000D_
$('div').click(function() {_x000D_
  var x = $(this).css('backgroundColor');_x000D_
  hexc(x);_x000D_
  console.log(color);_x000D_
})_x000D_
_x000D_
function hexc(colorval) {_x000D_
  var parts = colorval.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);_x000D_
  delete(parts[0]);_x000D_
  for (var i = 1; i <= 3; ++i) {_x000D_
    parts[i] = parseInt(parts[i]).toString(16);_x000D_
    if (parts[i].length == 1) parts[i] = '0' + parts[i];_x000D_
  }_x000D_
  color = '#' + parts.join('');_x000D_
}

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<div class='div' style='background-color: #f5b405'>Click me!</div>

_x000D_

Check working example at http://jsfiddle.net/DCaQb/

NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle

I tried several things, finally what worked for me was to delete (and move to trash) the .xib file in question. Then re-create it. To make things easier, I copied the stuff in the .xib temporarily to another .xib, then copied it back into the newly created one.

Find a file by name in Visual Studio Code

When you have opened a folder in a workspace you can do Ctrl+P (Cmd+P on Mac) and start typing the filename, or extension to filter the list of filenames

if you have:

plugin.ts
page.css
plugger.ts

You can type css and press enter and it will open the page.css. If you type .ts the list is filtered and contains two items.

There is already an object named in the database

"There is already an object named 'AboutUs' in the database."

This exception tells you that somebody has added an object named 'AboutUs' to the database already.

AutomaticMigrationsEnabled = true; can lead to it since data base versions are not controlled by you in this case. In order to avoid unpredictable migrations and make sure that every developer on the team works with the same data base structure I suggest you set AutomaticMigrationsEnabled = false;.

Automatic migrations and Coded migrations can live alongside if you are very careful and the only one developer on a project.

There is a quote from Automatic Code First Migrations post on Data Developer Center:

Automatic Migrations allows you to use Code First Migrations without having a code file in your project for each change you make. Not all changes can be applied automatically - for example column renames require the use of a code-based migration.

Recommendation for Team Environments

You can intersperse automatic and code-based migrations but this is not recommended in team development scenarios. If you are part of a team of developers that use source control you should either use purely automatic migrations or purely code-based migrations. Given the limitations of automatic migrations we recommend using code-based migrations in team environments.

Flutter- wrapping text

In a project of mine I wrap Text instances around Containers. This particular code sample features two stacked Text objects.

Here's a code sample.

    //80% of screen width
    double c_width = MediaQuery.of(context).size.width*0.8;

    return new Container (
      padding: const EdgeInsets.all(16.0),
      width: c_width,
      child: new Column (
        children: <Widget>[
          new Text ("Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 Long text 1 ", textAlign: TextAlign.left),
          new Text ("Long Text 2, Long Text 2, Long Text 2, Long Text 2, Long Text 2, Long Text 2, Long Text 2, Long Text 2, Long Text 2, Long Text 2, Long Text 2", textAlign: TextAlign.left),
        ],
      ),
    );

[edit] Added a width constraint to the container

MAX(DATE) - SQL ORACLE

Try:

SELECT MEMBSHIP_ID
  FROM user_payment
 WHERE user_id=1 
ORDER BY paym_date = (select MAX(paym_date) from user_payment and user_id=1);

Or:

SELECT MEMBSHIP_ID
FROM (
  SELECT MEMBSHIP_ID, row_number() over (order by paym_date desc) rn
      FROM user_payment
     WHERE user_id=1 )
WHERE rn = 1

Unable to add window -- token null is not valid; is your activity running?

This error happens when you are trying to show popUpWindow too early ,to fix it, give Id to main layout as main_layout and use below code

Java:

 findViewById(R.id.main_layout).post(new Runnable() {
   public void run() {
       popupWindow.showAtLocation(findViewById(R.id.main_layout), Gravity.CENTER, 0, 0);
   }
});

Kotlin:

 main_layout.post {
      popupWindow?.showAtLocation(main_layout, Gravity.CENTER, 0, 0)
    }

Credit to @kordzik

How does one extract each folder name from a path?

This is good in the general case:

yourPath.Split(@"\/", StringSplitOptions.RemoveEmptyEntries)

There is no empty element in the returned array if the path itself ends in a (back)slash (e.g. "\foo\bar\"). However, you will have to be sure that yourPath is really a directory and not a file. You can find out what it is and compensate if it is a file like this:

if(Directory.Exists(yourPath)) {
  var entries = yourPath.Split(@"\/", StringSplitOptions.RemoveEmptyEntries);
}
else if(File.Exists(yourPath)) {
  var entries = Path.GetDirectoryName(yourPath).Split(
                    @"\/", StringSplitOptions.RemoveEmptyEntries);
}
else {
  // error handling
}

I believe this covers all bases without being too pedantic. It will return a string[] that you can iterate over with foreach to get each directory in turn.

If you want to use constants instead of the @"\/" magic string, you need to use

var separators = new char[] {
  Path.DirectorySeparatorChar,  
  Path.AltDirectorySeparatorChar  
};

and then use separators instead of @"\/" in the code above. Personally, I find this too verbose and would most likely not do it.

SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column?

below works for mysql

update table1 INNER JOIN table2 on table1.col1 =  table2.col1
set table1.col1 =  table2.col2

How can I do GUI programming in C?

The most famous library to create some GUI in C language is certainly GTK.

With this library you can easily create some buttons (for your example). When a user clicks on the button, a signal is emitted and you can write a handler to do some actions.

How do I read an attribute on a class at runtime?

Rather then write a lot of code, just do this:

{         
   dynamic tableNameAttribute = typeof(T).CustomAttributes.FirstOrDefault().ToString();
   dynamic tableName = tableNameAttribute.Substring(tableNameAttribute.LastIndexOf('.'), tableNameAttribute.LastIndexOf('\\'));    
}

Copying a rsa public key to clipboard

To copy your public key to the clipboard

cat ~/.ssh/id_rsa.pub | pbcopy

This pipes the output of the file to pbcopy.

Create instance of generic type in Java?

From Java Tutorial - Restrictions on Generics:

Cannot Create Instances of Type Parameters

You cannot create an instance of a type parameter. For example, the following code causes a compile-time error:

public static <E> void append(List<E> list) {
    E elem = new E();  // compile-time error
    list.add(elem);
}

As a workaround, you can create an object of a type parameter through reflection:

public static <E> void append(List<E> list, Class<E> cls) throws Exception {
    E elem = cls.newInstance();   // OK
    list.add(elem);
}

You can invoke the append method as follows:

List<String> ls = new ArrayList<>();
append(ls, String.class);

repository element was not specified in the POM inside distributionManagement element or in -DaltDep loymentRepository=id::layout::url parameter

You should include the repository where you want to deploy in the distribution management section of the pom.xml.

Example:

<project xmlns="http://maven.apache.org/POM/4.0.0"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                      http://maven.apache.org/xsd/maven-4.0.0.xsd">
...   
<distributionManagement>
    <repository>
      <uniqueVersion>false</uniqueVersion>
      <id>corp1</id>
      <name>Corporate Repository</name>
      <url>scp://repo/maven2</url>
      <layout>default</layout>
    </repository>
    ...
</distributionManagement>
...
</project>

See Distribution Management

Initialize a vector array of strings

Sort of:

class some_class {
    static std::vector<std::string> v; // declaration
};

const char *vinit[] = {"one", "two", "three"};

std::vector<std::string> some_class::v(vinit, end(vinit)); // definition

end is just so I don't have to write vinit+3 and keep it up to date if the length changes later. Define it as:

template<typename T, size_t N>
T * end(T (&ra)[N]) {
    return ra + N;
}

Get refresh token google api

For our app we had to use both these parameters access_type=offline&prompt=consent. approval_prompt=force did not work for us

Parsing PDF files (especially with tables) with PDFBox

I'm not familiar with PDFBox, but you could try looking at itext. Even though the homepage says PDF generation, you can also do PDF manipulation and extraction. Have a look and see if it fits your use case.

How to compare types

If your instance is a Type:

Type typeFiled;
if (typeField == typeof(string))
{ 
    ... 
}

but if your instance is an object and not a Type use the as operator:

object value;
string text = value as string;
if (text != null)
{
    // value is a string and you can do your work here
}

this has the advantage to convert value only once into the specified type.

Inserting created_at data with Laravel

In your User model, add the following line in the User class:

public $timestamps = true;

Now, whenever you save or update a user, Laravel will automatically update the created_at and updated_at fields.

Update:
If you want to set the created at manually you should use the date format Y-m-d H:i:s. The problem is that the format you have used is not the same as Laravel uses for the created_at field.

Update: Nov 2018 Laravel 5.6 "message": "Access level to App\\Note::$timestamps must be public", Make sure you have the proper access level as well. Laravel 5.6 is public.

connect local repo with remote repo

git remote add origin <remote_repo_url>
git push --all origin

If you want to set all of your branches to automatically use this remote repo when you use git pull, add --set-upstream to the push:

git push --all --set-upstream origin

How to replace url parameter with javascript/jquery?

2020 answer since I was missing the functionality to automatically delete a parameter, so:

Based on my favorite answer https://stackoverflow.com/a/20420424/6284674 : I combined it with the ability to:

automatically delete an URL param if the value if null or '' based on answer https://stackoverflow.com/a/25214672/6284674
optionally push the updated URL directly in the window.location bar
IE support since it's only using regex and no URLSearchParams

JSfiddle: https://jsfiddle.net/MickV/zxc3b47u/


function replaceUrlParam(url, paramName, paramValue){
    if(paramValue == null || paramValue == "")
        return url
        .replace(new RegExp('[?&]' + paramValue + '=[^&#]*(#.*)?$'), '$1')
        .replace(new RegExp('([?&])' + paramValue + '=[^&]*&'), '$1');   
    url = url.replace(/\?$/,'');
    var pattern = new RegExp('\\b('+paramName+'=).*?(&|$)')
    if(url.search(pattern)>=0){
        return url.replace(pattern,'$1' + paramValue + '$2');
    }
    return url + (url.indexOf('?')>0 ? '&' : '?') + paramName + '=' + paramValue 
}

// Orginal URL (default jsfiddle console URL)
//https://fiddle.jshell.net/_display/?editor_console=true

console.log(replaceUrlParam(window.location.href,'a','2'));   
//https://fiddle.jshell.net/_display/?editor_console=true&a=2

console.log(replaceUrlParam(window.location.href,'a',''));   
//https://fiddle.jshell.net/_display/?editor_console=true

console.log(replaceUrlParam(window.location.href,'a',3));   
//https://fiddle.jshell.net/_display/?editor_console=true&a=3

console.log(replaceUrlParam(window.location.href,'a', null));   
//https://fiddle.jshell.net/_display/?editor_console=true&

//Optionally also update the replaced URL in the window location bar
//Note: This does not work in JSfiddle, but it does in a normal browser
function pushUrl(url){
    window.history.pushState("", "", replaceUrlParam(window.location.href,'a','2'));   
}


pushUrl(replaceUrlParam(window.location.href,'a','2'));   
//https://fiddle.jshell.net/_display/?editor_console=true&a=2

pushUrl(replaceUrlParam(window.location.href,'a',''));   
//https://fiddle.jshell.net/_display/?editor_console=true

pushUrl(replaceUrlParam(window.location.href,'a',3));   
//https://fiddle.jshell.net/_display/?editor_console=true&a=3

pushUrl(replaceUrlParam(window.location.href,'a', null));   
//https://fiddle.jshell.net/_display/?editor_console=true&

How to export and import a .sql file from command line with options?

since I have no enough reputation to comment after the highest post, so I add here.

use '|' on linux platform to save disk space.

thx @Hariboo, add events/triggers/routints parameters

mysqldump -x -u [uname] -p[pass]  -C --databases db_name  --events --triggers --routines | sed -e 's/DEFINER[ ]*=[ ]*[^*]*\*/\*/ '  | awk '{ if (index($0,"GTID_PURGED")) { getline; while (length($0) > 0) { getline; } } else { print $0 } }'  | grep -iv 'set @@' | trickle -u 10240 mysql -u username -p -h localhost DATA-BASE-NAME

some issues/tips:

Error: ......not exist when using LOCK TABLES

# --lock-all-tables,-x , this parameter is to keep data consistency because some transaction may still be working like schedule.
# also you need check and confirm: grant all privileges on *.* to root@"%" identified by "Passwd";

ERROR 2006 (HY000) at line 866: MySQL server has gone away mysqldump: Got errno 32 on write

# set this values big enough on destination mysql server, like: max_allowed_packet=1024*1024*20
# use compress parameter '-C'
# use trickle to limit network bandwidth while write data to destination server

ERROR 1419 (HY000) at line 32730: You do not have the SUPER privilege and binary logging is enabled (you might want to use the less safe log_bin_trust_function_creators variable)

# set SET GLOBAL log_bin_trust_function_creators = 1;
# or use super user import data

ERROR 1227 (42000) at line 138: Access denied; you need (at least one of) the SUPER privilege(s) for this operation mysqldump: Got errno 32 on write

# add sed/awk to avoid some privilege issues

hope this help!

Entity Framework Core: A second operation started on this context before a previous operation completed

I am not sure if you are using IoC and Dependency Injection to resolve your DbContext where ever it might be used. If you do and you are using native IoC from .NET Core (or any other IoC-Container) and you are getting this error, make sure to register your DbContext as Transient. Do

services.AddTransient<MyContext>();

services.AddDbContext<MyContext>(ServiceLifetime.Transient);

instead of

services.AddDbContext<MyContext>();

AddDbContext adds the context as scoped, which might cause troubles when working with multiple threads.

Also async / await operations can cause this behaviour, when using async lambda expressions.

Adding it as transient also has its downsides. You will not be able to make changes to some entity over multiple classes that are using the context because each class will get its own instance of your DbContext.

The simple explanation for that is, that the DbContext implementation is not thread-safe. You can read more about this here

I need to get all the cookies from the browser

To retrieve all cookies for the current document open in the browser, you again use the document.cookie property.

How do you change library location in R?

This post is just to mention an additional option. In case you need to set custom R libs in your Linux shell script you may easily do so by

export R_LIBS="~/R/lib"

See R admin guide on complete list of options.

How to replace all occurrences of a character in string?

Imagine a large binary blob where all 0x00 bytes shall be replaced by "\1\x30" and all 0x01 bytes by "\1\x31" because the transport protocol allows no \0-bytes.

In cases where:

the replacing and the to-replaced string have different lengths,
there are many occurences of the to-replaced string within the source string and
the source string is large,

the provided solutions cannot be applied (because they replace only single characters) or have a performance problem, because they would call string::replace several times which generates copies of the size of the blob over and over. (I do not know the boost solution, maybe it is OK from that perspective)

This one walks along all occurrences in the source string and builds the new string piece by piece once:

void replaceAll(std::string& source, const std::string& from, const std::string& to)
{
    std::string newString;
    newString.reserve(source.length());  // avoids a few memory allocations

    std::string::size_type lastPos = 0;
    std::string::size_type findPos;

    while(std::string::npos != (findPos = source.find(from, lastPos)))
    {
        newString.append(source, lastPos, findPos - lastPos);
        newString += to;
        lastPos = findPos + from.length();
    }

    // Care for the rest after last occurrence
    newString += source.substr(lastPos);

    source.swap(newString);
}

How to get date representing the first day of a month?

select cast(cast(datepart(year,getdate()) as char(4)) 
+ '/' 
+ cast(datepart(month,getdate()) as char(2))
+ '/01' as datetime)

Multi column forms with fieldsets

I disagree that .form-group should be within .col-*-n elements. In my experience, all the appropriate padding happens automatically when you use .form-group like .row within a form.

<div class="form-group">
    <div class="col-sm-12">
        <label for="user_login">Username</label>
        <input class="form-control" id="user_login" name="user[login]" required="true" size="30" type="text" />
    </div>
</div>

Check out this demo.

Altering the demo slightly by adding .form-horizontal to the form tag changes some of that padding.

<form action="#" method="post" class="form-horizontal">

Check out this demo.

When in doubt, inspect in Chrome or use Firebug in Firefox to figure out things like padding and margins. Using .row within the form fails in edsioufi's fiddle because .row uses negative left and right margins thereby drawing the horizontal bounds of the divs classed .row beyond the bounds of the containing fieldsets.

Min/Max of dates in an array?

Since dates are converted to UNIX epoch (numbers), you can use Math.max/min to find those:

var maxDate = Math.max.apply(null, dates)
// convert back to date object
maxDate = new Date(maxDate)

(tested in chrome only, but should work in most browsers)

SVN Commit specific files

You basically put the files you want to commit on the command line

svn ci file1 file2 dir1/file3

Using XPATH to search text containing  

I cannot get a match using Xpather, but the following worked for me with plain XML and XSL files in Microsoft's XML Notepad:

<xsl:value-of select="count(//td[text()='&nbsp;'])" />

The value returned is 1, which is the correct value in my test case.

However, I did have to declare nbsp as an entity within my XML and XSL using the following:

<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#160;"> ]>

I'm not sure if that helps you, but I was able to actually find nbsp using an XPath expression.

Edit: My code sample actually contains the characters ' ' but the JavaScript syntax highlight converts it to the space character. Don't be mislead!

How to check if object property exists with a variable holding the property name?

You can use hasOwnProperty, but based on the reference you need quotes when using this method:

if (myObj.hasOwnProperty('myProp')) {
    // do something
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty

Another way is to use in operator, but you need quotes here as well:

if ('myProp' in myObj) {
    // do something
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in

Powershell 2 copy-item which creates a folder if doesn't exist

  $filelist | % {
    $file = $_
    mkdir -force (Split-Path $dest) | Out-Null
    cp $file $dest
  }

What is phtml, and when should I use a .phtml extension rather than .php?

.phtml was the standard file extension for PHP 2 programs. .php3 took over for PHP 3. When PHP 4 came out they switched to a straight .php.

The older file extensions are still sometimes used, but aren't so common.

Limiting floats to two decimal points

from decimal import Decimal


def round_float(v, ndigits=2, rt_str=False):
    d = Decimal(v)
    v_str = ("{0:.%sf}" % ndigits).format(round(d, ndigits))
    if rt_str:
        return v_str
    return Decimal(v_str)

Results:

Python 3.6.1 (default, Dec 11 2018, 17:41:10)
>>> round_float(3.1415926)
Decimal('3.14')
>>> round_float(3.1445926)
Decimal('3.14')
>>> round_float(3.1455926)
Decimal('3.15')
>>> round_float(3.1455926, rt_str=True)
'3.15'
>>> str(round_float(3.1455926))
'3.15'

Change drive in git bash for windows

How I do it in Windows 10

Go to your folder directory you want to open in git bash like so

After you have reached the folder simply type git bash in the top navigation area like so and hit enter.

A git bash for the destined folder will open for you.

Hope that helps.

Create an empty data.frame

If you are looking for shortness :

read.csv(text="col1,col2")

so you don't need to specify the column names separately. You get the default column type logical until you fill the data frame.

Compare two Timestamp in java

if(mytime.after(fromtime) && mytime.before(totime))
  //mytime is in between

How to get the URL without any parameters in JavaScript?

Just one more alternative using URL

var theUrl = new URL(window.location.href);
theUrl.search = ""; //Remove any params
theUrl //as URL object
theUrl.href //as a string

Remove a cookie

Just set the value of cookie to false in order to unset it,

setcookie('cookiename', false);

PS:- That's the easiest way to do it.

Angularjs $http.get().then and binding to a list

Promise returned from $http can not be binded directly (I dont exactly know why). I'm using wrapping service that works perfectly for me:

.factory('DocumentsList', function($http, $q){
    var d = $q.defer();
    $http.get('/DocumentsList').success(function(data){
        d.resolve(data);
    });
    return d.promise;
});

and bind to it in controller:

function Ctrl($scope, DocumentsList) {
    $scope.Documents = DocumentsList;
    ...
}

UPDATE!:

In Angular 1.2 auto-unwrap promises was removed. See http://docs.angularjs.org/guide/migration#templates-no-longer-automatically-unwrap-promises

How to move up a directory with Terminal in OS X

For Mac Terminal

cd ..   # one up
cd ../  # two up
cd      # home directory 
cd /    # root directory
cd "yaya-13" # use quotes if the file name contains punctuation or spaces

undefined reference to `WinMain@16'

This error occurs when the linker can't find WinMain function, so it is probably missing. In your case, you are probably missing main too.

Consider the following Windows API-level program:

#define NOMINMAX
#include <windows.h>

int main()
{
    MessageBox( 0, "Blah blah...", "My Windows app!", MB_SETFOREGROUND );
}

Now let's build it using GNU toolchain (i.e. g++), no special options. Here gnuc is just a batch file that I use for that. It only supplies options to make g++ more standard:

C:\test> gnuc x.cpp

C:\test> objdump -x a.exe | findstr /i "^subsystem"
Subsystem               00000003        (Windows CUI)

C:\test> _

This means that the linker by default produced a console subsystem executable. The subsystem value in the file header tells Windows what services the program requires. In this case, with console system, that the program requires a console window.

This also causes the command interpreter to wait for the program to complete.

Now let's build it with GUI subsystem, which just means that the program does not require a console window:

C:\test> gnuc x.cpp -mwindows

C:\test> objdump -x a.exe | findstr /i "^subsystem"
Subsystem               00000002        (Windows GUI)

C:\test> _

Hopefully that's OK so far, although the -mwindows flag is just semi-documented.

Building without that semi-documented flag one would have to more specifically tell the linker which subsystem value one desires, and some Windows API import libraries will then in general have to be specified explicitly:

C:\test> gnuc x.cpp -Wl,-subsystem,windows

C:\test> objdump -x a.exe | findstr /i "^subsystem"
Subsystem               00000002        (Windows GUI)

C:\test> _

That worked fine, with the GNU toolchain.

But what about the Microsoft toolchain, i.e. Visual C++?

Well, building as a console subsystem executable works fine:

C:\test> msvc x.cpp user32.lib
x.cpp

C:\test> dumpbin /headers x.exe | find /i "subsystem" | find /i "Windows"
               3 subsystem (Windows CUI)

C:\test> _

However, with Microsoft's toolchain building as GUI subsystem does not work by default:

C:\test> msvc x.cpp user32.lib /link /subsystem:windows
x.cpp
LIBCMT.lib(wincrt0.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartu
p
x.exe : fatal error LNK1120: 1 unresolved externals

C:\test> _

Technically this is because Microsoft’s linker is non-standard by default for GUI subsystem. By default, when the subsystem is GUI, then Microsoft's linker uses a runtime library entry point, the function where the machine code execution starts, called winMainCRTStartup, that calls Microsoft's non-standard WinMain instead of standard main.

No big deal to fix that, though.

All you have to do is to tell Microsoft's linker which entry point to use, namely mainCRTStartup, which calls standard main:

C:\test> msvc x.cpp user32.lib /link /subsystem:windows /entry:mainCRTStartup
x.cpp

C:\test> dumpbin /headers x.exe | find /i "subsystem" | find /i "Windows"
               2 subsystem (Windows GUI)

C:\test> _

No problem, but very tedious. And so arcane and hidden that most Windows programmers, who mostly only use Microsoft’s non-standard-by-default tools, do not even know about it, and mistakenly think that a Windows GUI subsystem program “must” have non-standard WinMain instead of standard main. In passing, with C++0x Microsoft will have a problem with this, since the compiler must then advertize whether it's free-standing or hosted (when hosted it must support standard main).

Anyway, that's the reason why g++ can complain about WinMain missing: it's a silly non-standard startup function that Microsoft's tools require by default for GUI subsystem programs.

But as you can see above, g++ has no problem with standard main even for a GUI subsystem program.

So what could be the problem?

Well, you are probably missing a main. And you probably have no (proper) WinMain either! And then g++, after having searched for main (no such), and for Microsoft's non-standard WinMain (no such), reports that the latter is missing.

Testing with an empty source:

C:\test> type nul >y.cpp

C:\test> gnuc y.cpp -mwindows
c:/program files/mingw/bin/../lib/gcc/mingw32/4.4.1/../../../libmingw32.a(main.o):main.c:(.text+0xd2): undefined referen
ce to `WinMain@16'
collect2: ld returned 1 exit status

C:\test> _

Write HTML file using Java

A few months ago I had the same problem and every library I found provides too much functionality and complexity for my final goal. So I end up developing my own library - HtmlFlow - that provides a very simple and intuitive API that allows me to write HTML in a fluent style. Check it here: https://github.com/fmcarvalho/HtmlFlow (it also supports dynamic binding to HTML elements)

Here is an example of binding the properties of a Task object into HTML elements. Consider a Task Java class with three properties: Title, Description and a Priority and then we can produce an HTML document for a Task object in the following way:

import htmlflow.HtmlView;

import model.Priority;
import model.Task;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

public class App {

    private static HtmlView<Task> taskDetailsView(){
        HtmlView<Task> taskView = new HtmlView<>();
        taskView
                .head()
                .title("Task Details")
                .linkCss("https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css");
        taskView
                .body().classAttr("container")
                .heading(1, "Task Details")
                .hr()
                .div()
                .text("Title: ").text(Task::getTitle)
                .br()
                .text("Description: ").text(Task::getDescription)
                .br()
                .text("Priority: ").text(Task::getPriority);
        return taskView;
    }

    public static void main(String [] args) throws IOException{
        HtmlView<Task> taskView = taskDetailsView();
        Task task =  new Task("Special dinner", "Have dinner with someone!", Priority.Normal);

        try(PrintStream out = new PrintStream(new FileOutputStream("Task.html"))){
            taskView.setPrintStream(out).write(task);
            Desktop.getDesktop().browse(URI.create("Task.html"));
        }
    }
}

How do I open a Visual Studio project in design view?

You can double click directly on the .cs file representing your form in the Solution Explorer :

This will open Form1.cs [Design], which contains the drag&drop controls.

If you are directly in the code behind (The file named Form1.cs, without "[Design]"), you can press Shift + F7 (or only F7 depending on the project type) instead to open it.

From the design view, you can switch back to the Code Behind by pressing F7.

How do I calculate the percentage of a number?

$percentage = 50;
$totalWidth = 350;

$new_width = ($percentage / 100) * $totalWidth;

Git on Windows: How do you set up a mergetool?

i use an app called WinMerge ( http://winmerge.org/ ) info from their manual ( http://manual.winmerge.org/CommandLine.html )

this is the bash script i use from the mergetool directive via .gitconfig

#!/bin/sh
# using winmerge with git
# replaces unix style null files with a newly created empty windows temp file

file1=$1
if [ "$file1" == '/dev/null' ] || [ "$file1" == '\\.\nul' ] || [ ! -e "$file1" ]
    then 
       file1="/tmp/gitnull"
       `echo "">$file1`
fi
file2=$2
if [ "$file2" == '/dev/null' ] || [ "$file2" == '\\.\nul' ] || [ ! -e "$file2" ]
    then 
       file2="/tmp/gitnull"
       `echo "">$file2`
fi
echo diff : $1 -- $2
"C:\Program files (x86)\WinMerge\WinMergeU.exe" -e -ub -dl "Base" -dr "Mine" "$file1" "$file2"

basically the bash accounts for when the result of the diff in an empty file and creates a new temp file in the correct location.

URL encoding the space character: + or %20?

This confusion is because URLs are still 'broken' to this day.

Take "http://www.google.com" for instance. This is a URL. A URL is a Uniform Resource Locator and is really a pointer to a web page (in most cases). URLs actually have a very well-defined structure since the first specification in 1994.

We can extract detailed information about the "http://www.google.com" URL:

+---------------+-------------------+
|      Part     |      Data         |
+---------------+-------------------+
|  Scheme       | http              |
|  Host         | www.google.com    |
+---------------+-------------------+

If we look at a more complex URL such as:

"https://bob:[email protected]:8080/file;p=1?q=2#third"

we can extract the following information:

+-------------------+---------------------+
|        Part       |       Data          |
+-------------------+---------------------+
|  Scheme           | https               |
|  User             | bob                 |
|  Password         | bobby               |
|  Host             | www.lunatech.com    |
|  Port             | 8080                |
|  Path             | /file;p=1           |
|  Path parameter   | p=1                 |
|  Query            | q=2                 |
|  Fragment         | third               |
+-------------------+---------------------+

https://bob:[email protected]:8080/file;p=1?q=2#third
\___/   \_/ \___/ \______________/ \__/\_______/ \_/ \___/
  |      |    |          |          |      | \_/  |    |
Scheme User Password    Host       Port  Path |   | Fragment
        \_____________________________/       | Query
                       |               Path parameter
                   Authority

The reserved characters are different for each part.

For HTTP URLs, a space in a path fragment part has to be encoded to "%20" (not, absolutely not "+"), while the "+" character in the path fragment part can be left unencoded.

Now in the query part, spaces may be encoded to either "+" (for backwards compatibility: do not try to search for it in the URI standard) or "%20" while the "+" character (as a result of this ambiguity) has to be escaped to "%2B".

This means that the "blue+light blue" string has to be encoded differently in the path and query parts:

"http://example.com/blue+light%20blue?blue%2Blight+blue".

From there you can deduce that encoding a fully constructed URL is impossible without a syntactical awareness of the URL structure.

This boils down to:

You should have %20 before the ? and + after.

Source

What are the differences between a HashMap and a Hashtable in Java?

HashMap and HashTable

Some important points about HashMap and HashTable. please read below details.

1) Hashtable and Hashmap implement the java.util.Map interface 2) Both Hashmap and Hashtable is the hash based collection. and working on hashing. so these are similarity of HashMap and HashTable.

What is the difference between HashMap and HashTable?

1) First difference is HashMap is not thread safe While HashTable is ThreadSafe
2) HashMap is performance wise better because it is not thread safe. while Hashtable performance wise is not better because it is thread safe. so multiple thread can not access Hashtable at the same time.

How do I use extern to share variables between source files?

extern simply means a variable is defined elsewhere (e.g., in another file).

Key value pairs using JSON

I see what you are trying to ask and I think this is the simplest answer to what you are looking for, given you might not know how many key pairs your are being sent.

Simple Key Pair JSON structure

var data = {
    'XXXXXX' : '100.0',
    'YYYYYYY' : '200.0',
    'ZZZZZZZ' : '500.0',
}

Usage JavaScript code to access the key pairs

for (var key in data) 
  { if (!data.hasOwnProperty(key))
    { continue; } 
    console.log(key + ' -> ' +  data[key]);
  };

Console output should look like this

XXXXXX -> 100.0 
YYYYYYY -> 200.0 
ZZZZZZZ -> 500.0

Here is a JSFiddle to show how it works.

Session 'app': Error Installing APK

My problem was that I didn't accept the connection from the computer after turning on remote debugging. Once I accept the mac address, it went away. Silly mistake, but I didn't see the dialog box the first time. Worth a quick check if the others don't resolve the issue. But likely only a problem the first time you set up a phone.

ASP.NET MVC Return Json Result?

It should be :

public async Task<ActionResult> GetSomeJsonData()
{
    var model = // ... get data or build model etc.

    return Json(new { Data = model }, JsonRequestBehavior.AllowGet); 
}

or more simply:

return Json(model, JsonRequestBehavior.AllowGet);

I did notice that you are calling GetResources() from another ActionResult which wont work. If you are looking to get JSON back, you should be calling GetResources() from ajax directly...

How do I use modulus for float/double?

Unlike C, Java allows using the % for both integer and floating point and (unlike C89 and C++) it is well-defined for all inputs (including negatives):

From JLS §15.17.3:

The result of a floating-point remainder operation is determined by the rules of IEEE arithmetic:

If either operand is NaN, the result is NaN.

If the result is not NaN, the sign of the result equals the sign of the dividend.

If the dividend is an infinity, or the divisor is a zero, or both, the result is NaN.

If the dividend is finite and the divisor is an infinity, the result equals the dividend.

If the dividend is a zero and the divisor is finite, the result equals the dividend.

In the remaining cases, where neither an infinity, nor a zero, nor NaN is involved, the floating-point remainder r from the division of a dividend n by a divisor d is defined by the mathematical relation r=n-(d·q) where q is an integer that is negative only if n/d is negative and positive only if n/d is positive, and whose magnitude is as large as possible without exceeding the magnitude of the true mathematical quotient of n and d.

So for your example, 0.5/0.3 = 1.6... . q has the same sign (positive) as 0.5 (the dividend), and the magnitude is 1 (integer with largest magnitude not exceeding magnitude of 1.6...), and r = 0.5 - (0.3 * 1) = 0.2

Eclipse+Maven src/main/java not visible in src folder in Package Explorer

I was not able to see the build path option in the properties as well. Also the

src/main/java

was not visible in Project Explorer. below solution worked for me

Go to Project root
Select "Project facets" from Properties
Check "Java"

This fixes the issue

Order of execution of tests in TestNG

The ordering of methods in the class file is unpredictable, so you need to either use dependencies or include your methods explicitly in XML.

By default, TestNG will run your tests in the order they are found in the XML file. If you want the classes and methods listed in this file to be run in an unpredictible order, set the preserve-order attribute to false

Extract month and year from a zoo::yearmon object

Having had a similar problem with data from 1800 to now, this worked for me:

data2$date=as.character(data2$date) 
lct <- Sys.getlocale("LC_TIME"); 
Sys.setlocale("LC_TIME","C")
data2$date<- as.Date(data2$date, format = "%Y %m %d") # and it works

Getting request payload from POST request in Java servlet

If the contents of the body are a string in Java 8 you can do:

String body = request.getReader().lines().collect(Collectors.joining());

Centos/Linux setting logrotate to maximum file size for all logs

As mentioned by Zeeshan, the logrotate options size, minsize, maxsize are triggers for rotation.

To better explain it. You can run logrotate as often as you like, but unless a threshold is reached such as the filesize being reached or the appropriate time passed, the logs will not be rotated.

The size options do not ensure that your rotated logs are also of the specified size. To get them to be close to the specified size you need to call the logrotate program sufficiently often. This is critical.

For log files that build up very quickly (e.g. in the hundreds of MB a day), unless you want them to be very large you will need to ensure logrotate is called often! this is critical.

Therefore to stop your disk filling up with multi-gigabyte log files you need to ensure logrotate is called often enough, otherwise the log rotation will not work as well as you want.

on Ubuntu, you can easily switch to hourly rotation by moving the script /etc/cron.daily/logrotate to /etc/cron.hourly/logrotate

Or add

*/5 * * * * /etc/cron.daily/logrotate

To your /etc/crontab file. To run it every 5 minutes.

The size option ignores the daily, weekly, monthly time options. But minsize & maxsize take it into account.

The man page is a little confusing there. Here's my explanation.

minsize rotates only when the file has reached an appropriate size and the set time period has passed. e.g. minsize 50MB + daily If file reaches 50MB before daily time ticked over, it'll keep growing until the next day.

maxsize will rotate when the log reaches a set size or the appropriate time has passed. e.g. maxsize 50MB + daily. If file is 50MB and we're not at the next day yet, the log will be rotated. If the file is only 20MB and we roll over to the next day then the file will be rotated.

size will rotate when the log > size. Regardless of whether hourly/daily/weekly/monthly is specified. So if you have size 100M - it means when your log file is > 100M the log will be rotated if logrotate is run when this condition is true. Once it's rotated, the main log will be 0, and a subsequent run will do nothing.

So in the op's case. Specficially 50MB max I'd use something like the following:

/var/log/logpath/*.log {
    maxsize 50M
    hourly
    missingok
    rotate 8
    compress
    notifempty
    nocreate
}

Which means he'd create 8hrs of logs max. And there would be 8 of them at no more than 50MB each. Since he's saying that he's getting multi gigabytes each day and assuming they build up at a fairly constant rate, and maxsize is used he'll end up with around close to the max reached for each file. So they will be likely close to 50MB each. Given the volume they build, he would need to ensure that logrotate is run often enough to meet the target size.

Since I've put hourly there, we'd need logrotate to be run a minimum of every hour. But since they build up to say 2 gigabytes per day and we want 50MB... assuming a constant rate that's 83MB per hour. So you can imagine if we run logrotate every hour, despite setting maxsize to 50 we'll end up with 83MB log's in that case. So in this instance set the running to every 30 minutes or less should be sufficient.

Ensure logrotate is run every 30 mins.

*/30 * * * * /etc/cron.daily/logrotate

How can I get the size of an std::vector as an int?

In the first two cases, you simply forgot to actually call the member function (!, it's not a value) std::vector<int>::size like this:

#include <vector>

int main () {
    std::vector<int> v;
    auto size = v.size();
}

Your third call

int size = v.size();

triggers a warning, as not every return value of that function (usually a 64 bit unsigned int) can be represented as a 32 bit signed int.

int size = static_cast<int>(v.size());

would always compile cleanly and also explicitly states that your conversion from std::vector::size_type to int was intended.

Note that if the size of the vector is greater than the biggest number an int can represent, size will contain an implementation defined (de facto garbage) value.

Integer division with remainder in JavaScript?

ES6 introduces the new Math.trunc method. This allows to fix @MarkElliot's answer to make it work for negative numbers too:

var div = Math.trunc(y/x);
var rem = y % x;

Note that Math methods have the advantage over bitwise operators that they work with numbers over 2³¹.

Converting an int to std::string

You might include the implementation of itoa in your project.
Here's itoa modified to work with std::string: http://www.strudel.org.uk/itoa/

Declare a constant array

An array isn't immutable by nature; you can't make it constant.

The nearest you can get is:

var letter_goodness = [...]float32 {.0817, .0149, .0278, .0425, .1270, .0223, .0202, .0609, .0697, .0015, .0077, .0402, .0241, .0675, .0751, .0193, .0009, .0599, .0633, .0906, .0276, .0098, .0236, .0015, .0197, .0007 }

Note the [...] instead of []: it ensures you get a (fixed size) array instead of a slice. So the values aren't fixed but the size is.

Delete last N characters from field in a SQL Server database

This should do it, removing characters from the left by one or however many needed.

lEFT(columnX,LEN(columnX) - 1) AS NewColumnName

vertical-align: middle with Bootstrap 2

Try removing the float attribute from span6:

{ float:none !important; }

Get Substring between two characters using javascript

 var number = 200
 if (number >= 500 || number <= 600){
    alert("your message");
 }

What is the difference between bool and Boolean types in C#

One is an alias for the other.

Eclipse error, "The selection cannot be launched, and there are no recent launches"

Follow these steps to run your application on the device connected. 1. Change directories to the root of your Android project and execute: ant debug 2. Make sure the Android SDK platform-tools/ directory is included in your PATH environment variable, then execute: adb install bin/<*your app name*>-debug.apk On your device, locate <*your app name*> and open it.

Refer Running App

JavaScript - cannot set property of undefined

you never set d[a] to any value.

Because of this, d[a] evaluates to undefined, and you can't set properties on undefined.

If you add d[a] = {} right after d = {} things should work as expected.

Alternatively, you could use an object initializer:

d[a] = {
    greetings: b,
    data: c
};

Or you could set all the properties of d in an anonymous function instance:

d = new function () {
    this[a] = {
        greetings: b,
        data: c
    };
};

If you're in an environment that supports ES2015 features, you can use computed property names:

d = {
  [a]: {
    greetings: b,
    data: c
  }
};

How to synchronize or lock upon variables in Java?

For this functionality you are better off not using a lock at all. Try an AtomicReference.

public class Sample {
    private final AtomicReference<String> msg = new AtomicReference<String>();

    public void setMsg(String x) {
        msg.set(x);
    }

    public String getMsg() {
        return msg.getAndSet(null);
    }
}

No locks required and the code is simpler IMHO. In any case, it uses a standard construct which does what you want.

How do I get the name of the rows from the index of a data frame?

df.index

outputs the row names as pandas Index object.

list(df.index)

casts to a list.

df.index['Row 2':'Row 5']

supports label slicing similar to columns.

Async image loading from url inside a UITableView cell - image changes to wrong image while scrolling

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
        MyCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];

        cell.poster.image = nil; // or cell.poster.image = [UIImage imageNamed:@"placeholder.png"];

        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://myurl.com/%@.jpg", self.myJson[indexPath.row][@"movieId"]]];

        NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            if (data) {
                UIImage *image = [UIImage imageWithData:data];
                if (image) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        MyCell *updateCell = (id)[tableView cellForRowAtIndexPath:indexPath];
                        if (updateCell)
                            updateCell.poster.image = image;
                    });
                }
            }
        }];
        [task resume];

        return cell;
    }

JUNIT Test class in Eclipse - java.lang.ClassNotFoundException

what worked for me is to remove the runconfiguration of the test. Then right click the testclass and click run as junit test.

now it recreates a correct run config for me.

How should strace be used?

strace is a good tool for learning how your program makes various system calls (requests to the kernel) and also reports the ones that have failed along with the error value associated with that failure. Not all failures are bugs. For example, a code that is trying to search for a file may get a ENOENT (No such file or directory) error but that may be an acceptable scenario in the logic of the code.

One good use case of using strace is to debug race conditions during temporary file creation. For example a program that may be creating files by appending the process ID (PID) to some predecided string may face problems in multi-threaded scenarios. [A PID+TID (process id + thread id) or a better system call such as mkstemp will fix this].

It is also good for debugging crashes. You may find this (my) article on strace and debugging crashes useful.

Ternary operator ?: vs if...else

Depends on your compiler, but on any modern compiler there is generally no difference. It's something you shouldn't worry about. Concentrate on the maintainability of your code.

How to use Apple's new San Francisco font on a webpage

This is an update to this rather old question. I wanted to use the new SF Pro fonts on a website and found no fonts CDN, besides the above noted (applesocial.s3.amazonaws.com).

Clearly, this isn't an official content repository approved by Apple. Actually, I did not find ANY official fonts repository serving Apple fonts, ready to be used by web developers.

And there's a reason - if you read the license agreement that comes with downloading the new SF Pro and other fonts from https://developer.apple.com/fonts/ - it states in the first few paragraphs very clearly:

[...]you may use the Apple Font solely for creating mock-ups of user interfaces to be used in software products running on Apple’s iOS, macOS or tvOS operating systems, as applicable. The foregoing right includes the right to show the Apple Font in screen shots, images, mock-ups or other depictions, digital and/or print, of such software products running solely on iOS, macOS or tvOS.[...]

And:

Except as expressly provided for herein, you may not use the Apple Font to, create, develop, display or otherwise distribute any documentation, artwork, website content or any other work product.

Further:

Except as otherwise expressly permitted [...] (i) only one user may use the Apple Font at a time, and (ii) you may not make the Apple Font available over a network where it could be run or used by multiple computers at the same time.

No more questions for me. Apple clearly does not want their Fonts shared across the web outside their products.

Global variables in Javascript across multiple files

Hi to pass values from one js file to another js file we can use Local storage concept

<body>
<script src="two.js"></script>
<script src="three.js"></script>
<button onclick="myFunction()">Click me</button>
<p id="demo"></p>
</body>

Two.js file

function myFunction() {
var test =localStorage.name;

 alert(test);
}

Three.js File

localStorage.name = 1;

EOFError: EOF when reading a line

**The best is to use try except block to get rid of EOF **

try:
    width = input()
    height = input()
    def rectanglePerimeter(width, height):
       return ((width + height)*2)
    print(rectanglePerimeter(width, height))
except EOFError as e:
    print(end="")

How to check that a string is parseable to a double?

Apache, as usual, has a good answer from Apache Commons-Lang in the form of NumberUtils.isCreatable(String).

Handles nulls, no try/catch block required.

How to get a Char from an ASCII Character Code in c#

Two options:

char c1 = '\u0001';
char c1 = (char) 1;

How to Publish Web with msbuild?

found two different solutions which worked in slightly different way:

1. This solution is inspired by the answer from alexanderb [link]. Unfortunately it did not work for us - some dll's were not copied to the OutDir. We found out that replacing ResolveReferences with Build target solves the problem - now all necessary files are copied into the OutDir location.

msbuild /target:Build;_WPPCopyWebApplication  /p:Configuration=Release;OutDir=C:\Tmp\myApp\ MyApp.csproj

Disadvantage of this solution was the fact that OutDir contained not only files for publish.

2. The first solution works well but not as we expected. We wanted to have the publish functionality as it is in Visual Studio IDE - i.e. only the files which should be published will be copied into the Output directory. As it has been already mentioned first solution copies much more files into the OutDir - the website for publish is then stored in _PublishedWebsites/{ProjectName} subfolder. The following command solves this - only the files for publish will be copied to desired folder. So now you have directory which can be directly published - in comparison with the first solution you will save some space on hard drive.

msbuild /target:Build;PipelinePreDeployCopyAllFilesToOneFolder /p:Configuration=Release;_PackageTempDir=C:\Tmp\myApp\;AutoParameterizationWebConfigConnectionStrings=false MyApp.csproj

AutoParameterizationWebConfigConnectionStrings=false parameter will guarantee that connection strings will not be handled as special artifacts and will be correctly generated - for more information see link.

Merge (with squash) all changes from another branch as a single commit

2020 updated

With the --squash flag it looks like two parallel branches with no relation:

Sorting commits related to date looks like:

Personally, i don't like --squash option, try this trick, maybe it fits your needs, i use it for small projects:

git init
git checkout -b dev
Several commits in dev
After you did some great commits in dev(but not merged to master yet), if you do not want all commits copied to master branch, then make intentionally change something in master and (add some empty lines in README file and commit in master),
git merge dev It results merge conflict(empty lines in README), resolve it, commit with new message you want, and you are DONE. Here is the visual representation of it.

null commit for intentionally merge conflict, name it anything you prefer

How to convert a Kotlin source file to a Java source file

To convert a Kotlin source file to a Java source file you need to (when you in Android Studio):

Press Cmd-Shift-A on a Mac, or press Ctrl-Shift-A on a Windows machine.
Type the action you're looking for: Kotlin Bytecode and choose Show Kotlin Bytecode from menu.

Press Decompile button on the top of Kotlin Bytecode panel.

Now you get a Decompiled Java file along with Kotlin file in a adjacent tab:

Java Reflection Performance

There is some overhead with reflection, but it's a lot smaller on modern VMs than it used to be.

If you're using reflection to create every simple object in your program then something is wrong. Using it occasionally, when you have good reason, shouldn't be a problem at all.

javax.mail.AuthenticationFailedException: failed to connect, no password specified?

Your email session should be provided an authenticator instance as below

Session session = Session.getDefaultInstance(props,
    new Authenticator() {
        protected PasswordAuthentication  getPasswordAuthentication() {
        return new PasswordAuthentication(
                    "[email protected]", "password");
                }
    });

a complete example is here http://bharatonjava.wordpress.com/2012/08/27/sending-email-using-java-mail-api/

Initialize Array of Objects using NSArray

NSMutableArray *persons = [NSMutableArray array];
for (int i = 0; i < myPersonsCount; i++) {
   [persons addObject:[[Person alloc] init]];
}
NSArray *arrayOfPersons = [NSArray arrayWithArray:persons]; // if you want immutable array

also you can reach this without using NSMutableArray:

NSArray *persons = [NSArray array];
for (int i = 0; i < myPersonsCount; i++) {
   persons = [persons arrayByAddingObject:[[Person alloc] init]];
}

One more thing - it's valid for ARC enabled environment, if you going to use it without ARC don't forget to add autoreleased objects into array!

[persons addObject:[[[Person alloc] init] autorelease];

To delay JavaScript function call using jQuery

function sample() {
    alert("This is sample function");
}

$(function() {
    $("#button").click(function() {
        setTimeout(sample, 2000);
    });

});

jsFiddle.

If you want to encapsulate sample() there, wrap the whole thing in a self invoking function (function() { ... })().

Javascript to convert UTC to local time

The solutions above are right but might crash in FireFox and Safari! and that's what webility.js is trying to solve. Check the toUTC function, it works on most of the main browers and it returns the time in ISO format

Save attachments to a folder and rename them

Your question has 2 tasks to be performed. First to extract the Email attachments to a folder and saving or renaming it with a specific name.

If your search can be split to 2 searches you will get more hits. I could refer one page that explains how to save the attachment to a system folder <Link for the page to save attachments to a folder>.

Please post any page or code if you have found to save the attachment with specific name.

Class JavaLaunchHelper is implemented in both. One of the two will be used. Which one is undefined

From what I've found online, this is a bug introduced in JDK 1.7.0_45. It appears to also be present in JDK 1.7.0_60. A bug report on Oracle's website states that, while there was a fix, it was removed before the JDK was released. I do not know why the fix was removed, but it confirms what we've already suspected -- the JDK is still broken.

The bug report claims that the error is benign and should not cause any run-time problems, though one of the comments disagrees with that. In my own experience, I have been able to work without any problems using JDK 1.7.0_60 despite seeing the message.

If this issue is causing serious problems, here are a few things I would suggest:

Revert back to JDK 1.7.0_25 until a fix is added to the JDK.
Keep an eye on the bug report so that you are aware of any work being done on this issue. Maybe even add your own comment so Oracle is aware of the severity of the issue.
Try the JDK early releases as they come out. One of them might fix your problem.

Instructions for installing the JDK on Mac OS X are available at JDK 7 Installation for Mac OS X. It also contains instructions for removing the JDK.

How do I get client IP address in ASP.NET CORE?

You can use the IHttpConnectionFeature for getting this information.

var remoteIpAddress = httpContext.GetFeature<IHttpConnectionFeature>()?.RemoteIpAddress;

convert iso date to milliseconds in javascript

Yes, you can do this in a single line

let ms = Date.parse('2019-05-15 07:11:10.673Z');
console.log(ms);//1557904270673

Onclick CSS button effect

This is a press down button example I've made:

<div>
    <form id="forminput" action="action" method="POST">
       ...
    </form>
    <div style="right: 0px;bottom: 0px;position: fixed;" class="thumbnail">
        <div class="image">
            <a onclick="document.getElementById('forminput').submit();">
                <img src="images/button.png" alt="Some awesome text">
            </a>
        </div>
    </div>
</div>

the CSS file:

.thumbnail {
    width: 128px;
    height: 128px;
}

.image {
    width: 100%;
    height: 100%;    
}

.image img {
    -webkit-transition: all .25s ease; /* Safari and Chrome */
    -moz-transition: all .25s ease; /* Firefox */
    -ms-transition: all .25s ease; /* IE 9 */
    -o-transition: all .25s ease; /* Opera */
    transition: all .25s ease;
    max-width: 100%;
    max-height: 100%;
}

.image:hover img {
    -webkit-transform:scale(1.05); /* Safari and Chrome */
    -moz-transform:scale(1.05); /* Firefox */
    -ms-transform:scale(1.05); /* IE 9 */
    -o-transform:scale(1.05); /* Opera */
     transform:scale(1.05);
}

.image:active img {
    -webkit-transform:scale(.95); /* Safari and Chrome */
    -moz-transform:scale(.95); /* Firefox */
    -ms-transform:scale(.95); /* IE 9 */
    -o-transform:scale(.95); /* Opera */
     transform:scale(.95);
}

Enjoy it!

Postman: How to make multiple requests at the same time

If you are only doing GET requests and you need another simple solution from within your Chrome browser, just install the "Open Multiple URLs" extension:

https://chrome.google.com/webstore/detail/open-multiple-urls/oifijhaokejakekmnjmphonojcfkpbbh?hl=en

I've just ran 1500 url's at once, did lag google a bit but it works.

Trying to get PyCharm to work, keep getting "No Python interpreter selected"

In my case, there are several interpreters, but I have to manually add them.

To the right of where you see "No Interpreters", there is a gear icon. Click the gear icon -> Click "Add...", then you can add the ones you need.

Python 3: UnboundLocalError: local variable referenced before assignment

If you set the value of a variable inside the function, python understands it as creating a local variable with that name. This local variable masks the global variable.

In your case, Var1 is considered as a local variable, and it's used before being set, thus the error.

To solve this problem, you can explicitly say it's a global by putting global Var1 in you function.

Var1 = 1
Var2 = 0
def function():
    global Var1
    if Var2 == 0 and Var1 > 0:
        print("Result One")
    elif Var2 == 1 and Var1 > 0:
        print("Result Two")
    elif Var1 < 1:
        print("Result Three")
    Var1 =- 1
function()

How to use youtube-dl from a python program?

Here is a way.

We set-up options' string, in a list, just as we set-up command line arguments. In this case opts=['-g', 'videoID']. Then, invoke youtube_dl.main(opts). In this way, we write our custom .py module, import youtube_dl and then invoke the main() function.

/lib/ld-linux.so.2: bad ELF interpreter: No such file or directory

You did not mention what the command was that you were trying to run that produced the error message. However, the bottom line problem is that you are trying to run and/or install 32-bit (i686) packages on a 64-bit (x86_64) system which is not a good idea. For example, if you were trying to run the 32-bit version of Perl on a 64-bit system, the result would be something like

perl: /lib/ld-linux.so.2: bad ELF interpreter: No such file or directory

If you still want to use the rpm command to install the 32-bit versions of glibc and glibc-common on your system, then you need to know that you must install both of the packages at the same time and as a single command because they are dependencies of each other. The command to run in your case would be:

rpm -Uvh glibc-2.12-1.80.el6.i686.rpm glibc-common-2.12-1.80.el6.i686.rpm

Implementing multiple interfaces with Java - is there a way to delegate?

There's no pretty way. You might be able to use a proxy with the handler having the target methods and delegating everything else to them. Of course you'll have to use a factory because there'll be no constructor.

Change hash without reload in jQuery

You can set your hash directly to URL too.

window.location.hash = "YourHash";

The result : http://url#YourHash

Find duplicate records in MongoDB

db.getCollection('orders').aggregate([  
    {$group: { 
            _id: {name: "$name"},
            uniqueIds: {$addToSet: "$_id"},
            count: {$sum: 1}
        } 
    },
    {$match: { 
        count: {"$gt": 1}
        }
    }
])

First Group Query the group according to the fields.

Then we check the unique Id and count it, If count is greater then 1 then the field is duplicate in the entire collection so that thing is to be handle by $match query.

Mockito test a void method throws an exception

If you ever wondered how to do it using the new BDD style of Mockito:

willThrow(new Exception()).given(mockedObject).methodReturningVoid(...));

And for future reference one may need to throw exception and then do nothing:

willThrow(new Exception()).willDoNothing().given(mockedObject).methodReturningVoid(...));

setAttribute('display','none') not working

It works for me

setAttribute('style', 'display:none');

How do I get the Session Object in Spring?

ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
attr.getSessionId();

How can I determine the current CPU utilization from the shell?

The command uptime gives you load averages for the past 1, 5, and 15 minutes.

Lint: How to ignore "<key> is not translated in <language>" errors?

Add following to your gradle file in android section

    lintOptions {
       disable 'MissingTranslation'
    }

Executing Javascript code "on the spot" in Chrome?

I'm not sure how far it will get you, but you can execute JavaScript one line at a time from the Developer Tool Console.

Getting the current date in SQL Server?

As you are using SQL Server 2008, go with Martin's answer.

If you find yourself needing to do it in SQL Server 2005 where you don't have access to the Date column type, I'd use:

SELECT DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()), 0)

SQLFiddle

String field value length in mongoDB

I had a similar kind of scenario, but in my case string is not a 1st level attribute. It is inside an object. In here I couldn't find a suitable answer for it. So I thought to share my solution with you all(Hope this will help anyone with a similar kind of problem).

Parent Collection 

{
"Child":
{
"name":"Random Name",
"Age:"09"
}
}

Ex: If we need to get only collections that having child's name's length is higher than 10 characters.

 db.getCollection('Parent').find({$where: function() { 
for (var field in this.Child.name) { 
    if (this.Child.name.length > 10) 
        return true;

}
}})

jquery's append not working with svg element?

If the string you need to append is SVG and you add the proper namespace, you can parse the string as XML and append to the parent.

var xml = jQuery.parseXML('<circle xmlns="http://www.w3.org/2000/svg" cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red"/>');
$("svg").append(xml.documentElement))

Test a weekly cron job

I'm using Webmin because its a productivity gem for someone who finds command line administration a bit daunting and impenetrable.

There is a "Save and Run Now" button in the "System > Scheduled Cron Jobs > Edit Cron Job" web interface.

It displays the output of the command and is exactly what I needed.

Filter object properties by key in ES6

const filteredObject = Object.fromEntries(Object.entries(originalObject).filter(([key, value]) => key !== uuid))

How to commit changes to a new branch

git checkout -b your-new-branch

git add <files>

git commit -m <message>

First, checkout your new branch. Then add all the files you want to commit to staging. Lastly, commit all the files you just added. You might want to do a git push origin your-new-branch afterward so your changes show up on the remote.

Date and time conversion to some other Timezone in java

Display all post meta keys and meta values of the same post ID in wordpress

I use it in form of a meta box. Here is a function that dumps values of all the meta data for post.

    function dump_all_meta(){

        echo "<h3>All Post Meta</h3>";

        // Get all the data.
        $getPostCustom=get_post_custom();


        foreach( $getPostCustom as $name=>$value ) {

            echo "<strong>".$name."</strong>"."  =>  ";

            foreach($getPostCustom as $name=>$value) {

        echo "<strong>".$name."</strong>"."  =>  ";

        foreach($value as $nameAr=>$valueAr) {
                echo "<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
                echo $nameAr."  =>  ";
                echo var_dump($valueAr);
        }

        echo "<br /><br />";

        }
    } // Callback funtion ended.

Hope it helps. You can use it inside a meta box or at the front-end.

Make Div Draggable using CSS

Only using css techniques this does not seem possible to me. But you could use jqueryui draggable:

$('#drag_me').draggable();

Creating a 3D sphere in Opengl using Visual C++

Here's the code:

glPushMatrix();
glTranslatef(18,2,0);
glRotatef(angle, 0, 0, 0.7);
glColor3ub(0,255,255);
glutWireSphere(3,10,10);
glPopMatrix();

Reorder bars in geom_bar ggplot2 by value

Your code works fine, except that the barplot is ordered from low to high. When you want to order the bars from high to low, you will have to add a -sign before value:

ggplot(corr.m, aes(x = reorder(miRNA, -value), y = value, fill = variable)) + 
  geom_bar(stat = "identity")

which gives:

enter image description here

Used data:

corr.m <- structure(list(miRNA = structure(c(5L, 2L, 3L, 6L, 1L, 4L), .Label = c("mmu-miR-139-5p", "mmu-miR-1983", "mmu-miR-301a-3p", "mmu-miR-5097", "mmu-miR-532-3p", "mmu-miR-96-5p"), class = "factor"),
                         variable = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = "pos", class = "factor"),
                         value = c(7L, 75L, 70L, 5L, 10L, 47L)),
                    class = "data.frame", row.names = c("1", "2", "3", "4", "5", "6"))

What are libtool's .la file for?

According to http://blog.flameeyes.eu/2008/04/14/what-about-those-la-files, they're needed to handle dependencies. But using pkg-config may be a better option:

In a perfect world, every static library needing dependencies would have its own .pc file for pkg-config, and every package trying to statically link to that library would be using pkg-config --static to get the libraries to link to.

Why doesn't margin:auto center an image?

open div then put

style="width:100% ; margin:0px auto;"

image tag (or) content

close div

How to terminate a process in vbscript

Dim shll : Set shll = CreateObject("WScript.Shell")
Set Rt = shll.Exec("Notepad") : wscript.sleep 4000 : Rt.Terminate

Run the process with .Exec.

Then wait for 4 seconds.

After that kill this process.

Is there a splice method for strings?

So, whatever adding splice method to a String prototype cant work transparent to spec...

Let's do some one extend it:

String.prototype.splice = function(...a){
    for(var r = '', p = 0, i = 1; i < a.length; i+=3)
        r+= this.slice(p, p=a[i-1]) + (a[i+1]||'') + this.slice(p+a[i], p=a[i+2]||this.length);
    return r;
}

Every 3 args group "inserting" in splice style.
Special if there is more then one 3 args group, the end off each cut will be the start of next.
- '0123456789'.splice(4,1,'fourth',8,1,'eighth'); //return '0123fourth567eighth9'
You can drop or zeroing the last arg in each group (that treated as "nothing to insert")
- '0123456789'.splice(-4,2); //return '0123459'
You can drop all except 1st arg in last group (that treated as "cut all after 1st arg position")
- '0123456789'.splice(0,2,null,3,1,null,5,2,'/',8); //return '24/7'
if You pass multiple, you MUST check the sort of the positions left-to-right order by youreself!
And if you dont want you MUST DO NOT use it like this:
- '0123456789'.splice(4,-3,'what?'); //return "0123what?123456789"

ServletException, HttpServletResponse and HttpServletRequest cannot be resolved to a type

Two possible issues could be

you either forgot to include Servlet jar in your classpath
you forgot to import it in your Servlet class

To include Servlet jar in your class path in eclipse, Download the latest Servlet Jar and configure using buildpath option. look at this Link for more info.

If you have included the jar make sure that your import is declared.

import javax.servlet.http.HttpServletResponse

In C#, how to check whether a string contains an integer?

You could use char.IsDigit:

     bool isIntString = "your string".All(char.IsDigit)

Will return true if the string is a number

    bool containsInt = "your string".Any(char.IsDigit)

Will return true if the string contains a digit

Eclipse Build Path Nesting Errors

Here is a simple solution:

Right click the project >> properties >> build path;
In Source tab, Select all the source folders;
Remove them;
Right click on project, Maven >> Update the project.

PHP list of specific files in a directory

You should use glob.

glob('*.xml')

More about using glob and advanced filtering:

http://domexception.blogspot.fi/2013/08/php-using-functional-programming-for.html

How to print a groupby object

Thanks to Surya for good insights. I'd clean up his solution and simply do:

for key, value in df.groupby('A'):
    print(key, value)

How to change the background color of a UIButton while it's highlighted?

Try this if you have an image:

-(void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state;

or see if showsTouchWhenHighlighted is enough for you.

Link entire table row?

Also it depends if you need to use a table element or not. You can imitate a table using CSS and make an A element the row

<div class="table" style="width:100%;">
  <a href="#" class="tr">
    <span class="td">
      cell 1
    </span>
    <span class="td">
      cell 2
    </span>
  </a>
</div>

css:

.table{display:table;}
.tr{display:table-row;}
.td{display:table-cell;}
.tr:hover{background-color:#ccc;}

Java unsupported major minor version 52.0

I assumed openjdk8 would work with tomcat8 but I had to remove it and keep openjdk7 only, this fixed the issue in my case. I really don't know why or if there is something else I could have done.

number_format() with MySQL

You need this:

CONCAT(REPLACE(FORMAT(number,0),',','.'),',',SUBSTRING_INDEX(FORMAT(number,2),'.',-1))

How can I remove the last character of a string in python?

To remove the last character, just use a slice: my_file_path[:-1]. If you only want to remove a specific set of characters, use my_file_path.rstrip('/'). If you see the string as a file path, the operation is os.path.dirname. If the path is in fact a filename, I rather wonder where the extra slash came from in the first place.

How can I delete Docker's images?

Use

docker image prune -all

docker image prune -a

Remove all dangling images. If -a is specified, it will also remove all images not referenced by any container.

Note: You are prompted for confirmation before the prune removes anything, but you are not shown a list of what will potentially be removed. In addition, docker image ls does not support negative filtering, so it difficult to predict what images will actually be removed.

As stated under Docker's documentation for prune.

How does a hash table work?

You guys are very close to explaining this fully, but missing a couple things. The hashtable is just an array. The array itself will contain something in each slot. At a minimum you will store the hashvalue or the value itself in this slot. In addition to this you could also store a linked/chained list of values that have collided on this slot, or you could use the open addressing method. You can also store a pointer or pointers to other data you want to retrieve out of this slot.

It's important to note that the hashvalue itself generally does not indicate the slot into which to place the value. For example, a hashvalue might be a negative integer value. Obviously a negative number cannot point to an array location. Additionally, hash values will tend to many times be larger numbers than the slots available. Thus another calculation needs to be performed by the hashtable itself to figure out which slot the value should go into. This is done with a modulus math operation like:

uint slotIndex = hashValue % hashTableSize;

This value is the slot the value will go into. In open addressing, if the slot is already filled with another hashvalue and/or other data, the modulus operation will be run once again to find the next slot:

slotIndex = (remainder + 1) % hashTableSize;

I suppose there may be other more advanced methods for determining slot index, but this is the common one I've seen... would be interested in any others that perform better.

With the modulus method, if you have a table of say size 1000, any hashvalue that is between 1 and 1000 will go into the corresponding slot. Any Negative values, and any values greater than 1000 will be potentially colliding slot values. The chances of that happening depend both on your hashing method, as well as how many total items you add to the hash table. Generally, it's best practice to make the size of the hashtable such that the total number of values added to it is only equal to about 70% of its size. If your hash function does a good job of even distribution, you will generally encounter very few to no bucket/slot collisions and it will perform very quickly for both lookup and write operations. If the total number of values to add is not known in advance, make a good guesstimate using whatever means, and then resize your hashtable once the number of elements added to it reaches 70% of capacity.

I hope this has helped.

PS - In C# the GetHashCode() method is pretty slow and results in actual value collisions under a lot of conditions I've tested. For some real fun, build your own hashfunction and try to get it to NEVER collide on the specific data you are hashing, run faster than GetHashCode, and have a fairly even distribution. I've done this using long instead of int size hashcode values and it's worked quite well on up to 32 million entires hashvalues in the hashtable with 0 collisions. Unfortunately I can't share the code as it belongs to my employer... but I can reveal it is possible for certain data domains. When you can achieve this, the hashtable is VERY fast. :)

How to resolve Value cannot be null. Parameter name: source in linq?

Error message clearly says that source parameter is null. Source is the enumerable you are enumerating. In your case it is ListMetadataKor object. And its definitely null at the time you are filtering it second time. Make sure you never assign null to this list. Just check all references to this list in your code and look for assignments.

How to check if string contains Latin characters only?

You can use regex:

/[a-z]/i.test(str);

The i makes the regex case-insensitive. You could also do:

/[a-z]/.test(str.toLowerCase());

How do I use PHP namespaces with autoload?

<?php
spl_autoload_register(function ($classname){
   // for security purpose
   //your class name should match the name of your class "file.php"
   $classname = str_replace("..", "", $classname);
   require_once __DIR__.DIRECTORY_SEPARATOR.("classes/$classname.class.php");
});
try {
  $new = new Class1();
} catch (Exception $e) {
   echo "error = ". $e->getMessage();
}
?>

Combine or merge JSON on node.js without jQuery

Use merge.

$ npm install merge

Sample code:

var merge = require('merge'), // npm install -g merge
    original, cloned;

console.log(

    merge({ one: 'hello' }, { two: 'world' })

); // {"one": "hello", "two": "world"}

original = { x: { y: 1 } };

cloned = merge(true, original);

cloned.x.y++;

console.log(original.x.y, cloned.x.y); // 1, 2

Open text file and program shortcut in a Windows batch file

Its very simple, 1)Just go on directory where the file us stored 2)then enter command i.e. type filename.file_extention e.g type MyFile.tx

Cannot connect to the Docker daemon on macOS

You should execute script for install docker and launch it from command line:

brew install --cask docker
sudo -H pip3 install --upgrade pip3
open -a Docker
docker-compose ...

after that docker-compose should work

Is it possible to simulate key press events programmatically?

just use CustomEvent

Node.prototype.fire=function(type,options){
     var event=new CustomEvent(type);
     for(var p in options){
         event[p]=options[p];
     }
     this.dispatchEvent(event);
}

4 ex want to simulate ctrl+z

window.addEventListener("keyup",function(ev){
     if(ev.ctrlKey && ev.keyCode === 90) console.log(ev); // or do smth
     })

 document.fire("keyup",{ctrlKey:true,keyCode:90,bubbles:true})

Using jQuery to center a DIV on the screen

I put a jquery plugin here

VERY SHORT VERSION

$('#myDiv').css({top:'50%',left:'50%',margin:'-'+($('#myDiv').height() / 2)+'px 0 0 -'+($('#myDiv').width() / 2)+'px'});

SHORT VERSION

(function($){
    $.fn.extend({
        center: function () {
            return this.each(function() {
                var top = ($(window).height() - $(this).outerHeight()) / 2;
                var left = ($(window).width() - $(this).outerWidth()) / 2;
                $(this).css({position:'absolute', margin:0, top: (top > 0 ? top : 0)+'px', left: (left > 0 ? left : 0)+'px'});
            });
        }
    }); 
})(jQuery);

Activated by this code :

$('#mainDiv').center();

PLUGIN VERSION

(function($){
     $.fn.extend({
          center: function (options) {
               var options =  $.extend({ // Default values
                    inside:window, // element, center into window
                    transition: 0, // millisecond, transition time
                    minX:0, // pixel, minimum left element value
                    minY:0, // pixel, minimum top element value
                    withScrolling:true, // booleen, take care of the scrollbar (scrollTop)
                    vertical:true, // booleen, center vertical
                    horizontal:true // booleen, center horizontal
               }, options);
               return this.each(function() {
                    var props = {position:'absolute'};
                    if (options.vertical) {
                         var top = ($(options.inside).height() - $(this).outerHeight()) / 2;
                         if (options.withScrolling) top += $(options.inside).scrollTop() || 0;
                         top = (top > options.minY ? top : options.minY);
                         $.extend(props, {top: top+'px'});
                    }
                    if (options.horizontal) {
                          var left = ($(options.inside).width() - $(this).outerWidth()) / 2;
                          if (options.withScrolling) left += $(options.inside).scrollLeft() || 0;
                          left = (left > options.minX ? left : options.minX);
                          $.extend(props, {left: left+'px'});
                    }
                    if (options.transition > 0) $(this).animate(props, options.transition);
                    else $(this).css(props);
                    return $(this);
               });
          }
     });
})(jQuery);

Activated by this code :

$(document).ready(function(){
    $('#mainDiv').center();
    $(window).bind('resize', function() {
        $('#mainDiv').center({transition:300});
    });
);

is that right ?

UPDATE :

From CSS-Tricks

.center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%); /* Yep! */
  width: 48%;
  height: 59%;
}

EC2 instance has no public DNS

I tried to fix the 'no public DNS' once the EC2 was up and running, I couldnt add a public DNS

this is even after following the above steps making mods to the VPC or the Subnet

so, I had to make modifications to the subnet and the vpc, before starting another instance, and THEN start up a new instance.

the new instance had a public DNS. That is how it worked for me.

In Android EditText, how to force writing uppercase?

A Java 1-liner of the proposed solution could be:

editText.setFilters(Lists.asList(new InputFilter.AllCaps(), editText.getFilters())
    .toArray(new InputFilter[editText.getFilters().length + 1]));

Note it needs com.google.common.collect.Lists.

how to inherit Constructor from super class to sub class

You inherit class attributes, not class constructors .This is how it goes :

If no constructor is added in the super class, if no then the compiler adds a no argument contructor. This default constructor is invoked implicitly whenever a new instance of the sub class is created . Here the sub class may or may not have constructor, all is ok .

if a constructor is provided in the super class, the compiler will see if it is a no arg constructor or a constructor with parameters.

if no args, then the compiler will invoke it for any sub class instanciation . Here also the sub class may or may not have constructor, all is ok .

if 1 or more contructors in the parent class have parameters and no args constructor is absent, then the subclass has to have at least 1 constructor where an implicit call for the parent class construct is made via super (parent_contractor params) .

this way you are sure that the inherited class attributes are always instanciated .

Create a CSV File for a user in PHP

Put in the $output variable the CSV data and echo with the correct headers

header("Content-type: application/download\r\n");
header("Content-disposition: filename=filename.csv\r\n\r\n");
header("Content-Transfer-Encoding: ASCII\r\n");
header("Content-length: ".strlen($output)."\r\n");
echo $output;

Comparing two input values in a form validation with AngularJS

Here is an angular 1.3 version of the sameAs directive:

angular.module('app').directive('sameAs', [function() {
  'use strict';

  return {
    require: 'ngModel',
    restrict: 'A',
    link: function(scope, element, attrs, ctrl) {
      var modelToMatch = element.attr('sameAs');      
      ctrl.$validators.match = function(modelValue, viewValue) {
        return viewValue === scope.$eval(modelToMatch);
      };
    }
  };
}]);

How to secure database passwords in PHP?

The most secure way is to not have the information specified in your PHP code at all.

If you're using Apache that means to set the connection details in your httpd.conf or virtual hosts file file. If you do that you can call mysql_connect() with no parameters, which means PHP will never ever output your information.

This is how you specify these values in those files:

php_value mysql.default.user      myusername
php_value mysql.default.password  mypassword
php_value mysql.default.host      server

Then you open your mysql connection like this:

<?php
$db = mysqli_connect();

Or like this:

<?php
$db = mysqli_connect(ini_get("mysql.default.user"),
                     ini_get("mysql.default.password"),
                     ini_get("mysql.default.host"));

Twitter Bootstrap - how to center elements horizontally or vertically

for bootstrap4 vertical center of few items

d-flex for flex rules

flex-column for vertical direction on items

justify-content-center for centering

style='height: 300px;' must have for set points where center be calc or use h-100 class

<div class="d-flex flex-column justify-content-center bg-secondary" style="
    height: 300px;
">
    <div class="p-2 bg-primary">Flex item</div>
    <div class="p-2 bg-primary">Flex item</div>
    <div class="p-2 bg-primary">Flex item</div>
  </div>

SQL Server loop - how do I loop through a set of records

this way we can iterate into table data.

DECLARE @_MinJobID INT
DECLARE @_MaxJobID INT
CREATE  TABLE #Temp (JobID INT)

INSERT INTO #Temp SELECT * FROM DBO.STRINGTOTABLE(@JobID,',')
SELECT @_MinJID = MIN(JobID),@_MaxJID = MAX(JobID)  FROM #Temp

    WHILE @_MinJID <= @_MaxJID
    BEGIN

        INSERT INTO Mytable        
        (        
            JobID,        
        )        

        VALUES        
        (        
            @_MinJobID,        
        ) 

        SET @_MinJID = @_MinJID + 1;
    END

DROP TABLE #Temp

STRINGTOTABLE is user define function which will parse comma separated data and return table. thanks

When to use malloc for char pointers

As was indicated by others, you don't need to use malloc just to do:

const char *foo = "bar";

The reason for that is exactly that *foo is a pointer — when you initialize foo you're not creating a copy of the string, just a pointer to where "bar" lives in the data section of your executable. You can copy that pointer as often as you'd like, but remember, they're always pointing back to the same single instance of that string.

So when should you use malloc? Normally you use strdup() to copy a string, which handles the malloc in the background. e.g.

const char *foo = "bar";
char *bar = strdup(foo); /* now contains a new copy of "bar" */
printf("%s\n", bar);     /* prints "bar" */
free(bar);               /* frees memory created by strdup */

Now, we finally get around to a case where you may want to malloc if you're using sprintf() or, more safely snprintf() which creates / formats a new string.

char *foo = malloc(sizeof(char) * 1024);        /* buffer for 1024 chars */
snprintf(foo, 1024, "%s - %s\n", "foo", "bar"); /* puts "foo - bar\n" in foo */
printf(foo);                                    /* prints "foo - bar" */
free(foo);                                      /* frees mem from malloc */

Origin <origin> is not allowed by Access-Control-Allow-Origin

If you're in Google Chrome, try installing this add-on:

https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi/related

C# Connecting Through Proxy

This code has worked for me:

WebClient wc = new WebClient();
wc.Proxy.Credentials = CredentialCache.DefaultCredentials;

How do you compare two version Strings in Java?

If you already have Jackson in your project, you can use com.fasterxml.jackson.core.Version:

import com.fasterxml.jackson.core.Version;
import org.junit.Test;

import static org.junit.Assert.assertTrue;

public class VersionTest {

    @Test
    public void shouldCompareVersion() {
        Version version1 = new Version(1, 11, 1, null, null, null);
        Version version2 = new Version(1, 12, 1, null, null, null);
        assertTrue(version1.compareTo(version2) < 0);
    }
}

How to get visitor's location (i.e. country) using geolocation?

You can use my service, http://ipinfo.io, for this. It will give you the client IP, hostname, geolocation information (city, region, country, area code, zip code etc) and network owner. Here's a simple example that logs the city and country:

$.get("https://ipinfo.io", function(response) {
    console.log(response.city, response.country);
}, "jsonp");

Here's a more detailed JSFiddle example that also prints out the full response information, so you can see all of the available details: http://jsfiddle.net/zK5FN/2/

The location will generally be less accurate than the native geolocation details, but it doesn't require any user permission.

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