What do the different readystates in XMLHttpRequest mean, and how can I use them?

onreadystatechange Stores a function (or the name of a function) to be called automatically each time the readyState property changes readyState Holds the status of the XMLHttpRequest. Changes from 0 to 4:

0: request not initialized

1: server connection established

2: request received

3: processing request

4: request finished and response is ready

status 200: "OK"

404: Page not found

Test for non-zero length string in Bash: [ -n "$var" ] or [ "$var" ]

It is better to use the more powerful [[ as far as Bash is concerned.

Usual cases

if [[ $var ]]; then   # var is set and it is not empty
if [[ ! $var ]]; then # var is not set or it is set to an empty string

The above two constructs look clean and readable. They should suffice in most cases.

Note that we don't need to quote the variable expansions inside [[ as there is no danger of word splitting and globbing.

To prevent shellcheck's soft complaints about [[ $var ]] and [[ ! $var ]], we could use the -n option.

Rare cases

In the rare case of us having to make a distinction between "being set to an empty string" vs "not being set at all", we could use these:

if [[ ${var+x} ]]; then           # var is set but it could be empty
if [[ ! ${var+x} ]]; then         # var is not set
if [[ ${var+x} && ! $var ]]; then # var is set and is empty

We can also use the -v test:

if [[ -v var ]]; then             # var is set but it could be empty
if [[ ! -v var ]]; then           # var is not set
if [[ -v var && ! $var ]]; then   # var is set and is empty
if [[ -v var && -z $var ]]; then  # var is set and is empty

Try `var_export`

You may want to check out var_export — while it doesn't provide the same output as var_dump it does provide a second $return parameter which will cause it to return its output rather than print it:

$debug = var_export($my_var, true);

Why?

I prefer this one-liner to using ob_start and ob_get_clean(). I also find that the output is a little easier to read, since it's just PHP code.

The difference between var_dump and var_export is that var_export returns a "parsable string representation of a variable" while var_dump simply dumps information about a variable. What this means in practice is that var_export gives you valid PHP code (but may not give you quite as much information about the variable, especially if you're working with resources).

Demo:

$demo = array(
    "bool" => false,
    "int" => 1,
    "float" => 3.14,
    "string" => "hello world",
    "array" => array(),
    "object" => new stdClass(),
    "resource" => tmpfile(),
    "null" => null,
);

// var_export -- nice, one-liner
$debug_export = var_export($demo, true);

// var_dump
ob_start();
var_dump($demo);
$debug_dump = ob_get_clean();

// print_r -- included for completeness, though not recommended
$debug_printr = print_r($demo, true);

The difference in output:

var_export (`$debug_export` in above example):

 array (
  'bool' => false,
  'int' => 1,
  'float' => 3.1400000000000001,
  'string' => 'hello world',
  'array' => 
  array (
  ),
  'object' => 
  stdClass::__set_state(array(
  )),
  'resource' => NULL, // Note that this resource pointer is now NULL
  'null' => NULL,
)

var_dump (`$debug_dump` in above example):

 array(8) {
  ["bool"]=>
  bool(false)
  ["int"]=>
  int(1)
  ["float"]=>
  float(3.14)
  ["string"]=>
  string(11) "hello world"
  ["array"]=>
  array(0) {
  }
  ["object"]=>
  object(stdClass)#1 (0) {
  }
  ["resource"]=>
  resource(4) of type (stream)
  ["null"]=>
  NULL
}

print_r (`$debug_printr` in above example):

Array
(
    [bool] => 
    [int] => 1
    [float] => 3.14
    [string] => hello world
    [array] => Array
        (
        )

    [object] => stdClass Object
        (
        )

    [resource] => Resource id #4
    [null] => 
)

Caveat: `var_export` does not handle circular references

If you're trying to dump a variable with circular references, calling var_export will result in a PHP warning:

 $circular = array();
 $circular['self'] =& $circular;
 var_export($circular);

Results in:

 Warning: var_export does not handle circular references in example.php on line 3
 array (
   'self' => 
   array (
     'self' => NULL,
   ),
 )

Both var_dump and print_r, on the other hand, will output the string *RECURSION* when encountering circular references.

Days between two dates?

Do you mean full calendar days, or groups of 24 hours?

For simply 24 hours, assuming you're using Python's datetime, then the timedelta object already has a days property:

days = (a - b).days

For calendar days, you'll need to round a down to the nearest day, and b up to the nearest day, getting rid of the partial day on either side:

roundedA = a.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
roundedB = b.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
days = (roundedA - roundedB).days

jdk7 32 bit windows version to download

As detailed in the Oracle Java SE Support Roadmap

After April 2015, Oracle will no longer post updates of Java SE 7 to its public download sites. Existing Java SE 7 downloads already posted as of April 2015 will remain accessible in the Java Archive

Check the Java SE 7 Archive Downloads page. The last release was update 80, therefore the 32-bit filename to download is jdk-7u80-windows-i586.exe (64-bit is named jdk-7u80-windows-x64.exe.

Old Java downloads also require a sign on to an Oracle account now :-( however with some crafty cookie creating one can use wget to grab the file without signing in.

wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u80-b15/jdk-7u80-windows-i586.exe"

How can I get the name of an html page in Javascript?

Use: location.pathname

alert(location.pathname);

http://jsfiddle.net/yQqe3/

https://developer.mozilla.org/en-US/docs/DOM/window.location

Ruby: kind_of? vs. instance_of? vs. is_a?

I also wouldn't call two many (is_a? and kind_of? are aliases of the same method), but if you want to see more possibilities, turn your attention to #class method:

A = Class.new
B = Class.new A

a, b = A.new, B.new
b.class < A # true - means that b.class is a subclass of A
a.class < B # false - means that a.class is not a subclass of A
# Another possibility: Use #ancestors
b.class.ancestors.include? A # true - means that b.class has A among its ancestors
a.class.ancestors.include? B # false - means that B is not an ancestor of a.class

Is it valid to replace http:// with // in a <script src="http://...">?

are there any cases where it doesn't work?

If the parent page was loaded from file://, then it probably does not work (it will try to get file://cdn.example.com/js_file.js, which of course you could provide locally as well).

How can I select the first day of a month in SQL?

SELECT @myDate - DAY(@myDate) + 1

Converting timestamp to time ago in PHP e.g 1 day ago, 2 days ago...

Slightly modified answer from above:

  $commentTime = strtotime($whatever)
  $today       = strtotime('today');
  $yesterday   = strtotime('yesterday');
  $todaysHours = strtotime('now') - strtotime('today');

private function timeElapsedString(
    $commentTime,
    $todaysHours,
    $today,
    $yesterday
) {
    $tokens = array(
        31536000 => 'year',
        2592000 => 'month',
        604800 => 'week',
        86400 => 'day',
        3600 => 'hour',
        60 => 'minute',
        1 => 'second'
    );
    $time = time() - $commentTime;
    $time = ($time < 1) ? 1 : $time;
    if ($commentTime >= $today || $commentTime < $yesterday) {
        foreach ($tokens as $unit => $text) {
            if ($time < $unit) {
                continue;
            }
            if ($text == 'day') {
                $numberOfUnits = floor(($time - $todaysHours) / $unit) + 1;
            } else {
                $numberOfUnits = floor(($time)/ $unit);
            }
            return $numberOfUnits . ' ' . $text . (($numberOfUnits > 1) ? 's' : '') . ' ago';
        }
    } else {
        return 'Yesterday';
    }
}

PHP foreach with Nested Array?

As I understand , all of previous answers , does not make an Array output, In my case : I have a model with parent-children structure (simplified code here):

public function parent(){

    return $this->belongsTo('App\Models\Accounting\accounting_coding', 'parent_id');
}


public function children()
{

    return $this->hasMany('App\Models\Accounting\accounting_coding', 'parent_id');
}

and if you want to have all of children IDs as an Array , This approach is fine and working for me :

public function allChildren()
{
    $allChildren = [];
    if ($this->has_branch) {

        foreach ($this->children as $child) {

            $subChildren = $child->allChildren();

            if (count($subChildren) == 1) {
                $allChildren  [] = $subChildren[0];
            } else if (count($subChildren) > 1) {
                $allChildren += $subChildren;
            }
        }
    }
    $allChildren  [] = $this->id;//adds self Id to children Id list

    return $allChildren; 
}

the allChildren() returns , all of childrens as a simple Array .

How to import and use image in a Vue single file component?

It is heavily suggested to make use of webpack when importing pictures from assets and in general for optimisation and pathing purposes

If you wish to load them by webpack you can simply use :src='require('path/to/file')' Make sure you use : otherwise it won't execute the require statement as Javascript.

In typescript you can do almost the exact same operation: :src="require('@/assets/image.png')"

Why the following is generally considered bad practice:

<template>
  <div id="app">
    <img src="./assets/logo.png">
  </div>
</template>

<script>
export default {
}
</script>

<style lang="scss">
</style>

When building using the Vue cli, webpack is not able to ensure that the assets file will maintain a structure that follows the relative importing. This is due to webpack trying to optimize and chunk items appearing inside of the assets folder. If you wish to use a relative import you should do so from within the static folder and use: <img src="./static/logo.png">

GSON throwing "Expected BEGIN_OBJECT but was BEGIN_ARRAY"?

according to GSON User guide, you cannot.

Collections Limitations

Can serialize collection of arbitrary objects but can not deserialize from it. Because there is no way for the user to indicate the type of the resulting object

How to trim a string to N chars in Javascript?

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/substr

From link:

string.substr(start[, length])

Steps to send a https request to a rest service in Node js

just use the core https module with the https.request function. Example for a POST request (GET would be similar):

var https = require('https');

var options = {
  host: 'www.google.com',
  port: 443,
  path: '/upload',
  method: 'POST'
};

var req = https.request(options, function(res) {
  console.log('STATUS: ' + res.statusCode);
  console.log('HEADERS: ' + JSON.stringify(res.headers));
  res.setEncoding('utf8');
  res.on('data', function (chunk) {
    console.log('BODY: ' + chunk);
  });
});

req.on('error', function(e) {
  console.log('problem with request: ' + e.message);
});

// write data to request body
req.write('data\n');
req.write('data\n');
req.end();

Resolve conflicts using remote changes when pulling from Git remote

You can either use the answer from the duplicate link pointed by nvm.

Or you can resolve conflicts by using their changes (but some of your changes might be kept if they don't conflict with remote version):

git pull -s recursive -X theirs

How to validate phone numbers using regex

Although the answer to strip all whitespace is neat, it doesn't really solve the problem that's posed, which is to find a regex. Take, for instance, my test script that downloads a web page and extracts all phone numbers using the regex. Since you'd need a regex anyway, you might as well have the regex do all the work. I came up with this:

1?\W*([2-9][0-8][0-9])\W*([2-9][0-9]{2})\W*([0-9]{4})(\se?x?t?(\d*))?

Here's a perl script to test it. When you match, $1 contains the area code, $2 and $3 contain the phone number, and $5 contains the extension. My test script downloads a file from the internet and prints all the phone numbers in it.

#!/usr/bin/perl

my $us_phone_regex =
        '1?\W*([2-9][0-8][0-9])\W*([2-9][0-9]{2})\W*([0-9]{4})(\se?x?t?(\d*))?';


my @tests =
(
"1-234-567-8901",
"1-234-567-8901 x1234",
"1-234-567-8901 ext1234",
"1 (234) 567-8901",
"1.234.567.8901",
"1/234/567/8901",
"12345678901",
"not a phone number"
);

foreach my $num (@tests)
{
        if( $num =~ m/$us_phone_regex/ )
        {
                print "match [$1-$2-$3]\n" if not defined $4;
                print "match [$1-$2-$3 $5]\n" if defined $4;
        }
        else
        {
                print "no match [$num]\n";
        }
}

#
# Extract all phone numbers from an arbitrary file.
#
my $external_filename =
        'http://web.textfiles.com/ezines/PHREAKSANDGEEKS/PnG-spring05.txt';
my @external_file = `curl $external_filename`;
foreach my $line (@external_file)
{
        if( $line =~ m/$us_phone_regex/ )
        {
                print "match $1 $2 $3\n";
        }
}

Edit:

You can change \W* to \s*\W?\s* in the regex to tighten it up a bit. I wasn't thinking of the regex in terms of, say, validating user input on a form when I wrote it, but this change makes it possible to use the regex for that purpose.

'1?\s*\W?\s*([2-9][0-8][0-9])\s*\W?\s*([2-9][0-9]{2})\s*\W?\s*([0-9]{4})(\se?x?t?(\d*))?';

Proper use cases for Android UserManager.isUserAGoat()?

Android R Update:

From Android R, this method always returns false. Google says that this is done "to protect goat privacy":

/**
 * Used to determine whether the user making this call is subject to
 * teleportations.
 *
 * <p>As of {@link android.os.Build.VERSION_CODES#LOLLIPOP}, this method can
 * now automatically identify goats using advanced goat recognition technology.</p>
 *
 * <p>As of {@link android.os.Build.VERSION_CODES#R}, this method always returns
 * {@code false} in order to protect goat privacy.</p>
 *
 * @return Returns whether the user making this call is a goat.
 */
public boolean isUserAGoat() {
    if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.R) {
        return false;
    }
    return mContext.getPackageManager()
            .isPackageAvailable("com.coffeestainstudios.goatsimulator");
}

Previous answer:

From their source, the method used to return false until it was changed in API 21.

/**
 * Used to determine whether the user making this call is subject to
 * teleportations.
 * @return whether the user making this call is a goat 
 */
public boolean isUserAGoat() {
    return false;
}

It looks like the method has no real use for us as developers. Someone has previously stated that it might be an Easter egg.

In API 21 the implementation was changed to check if there is an installed app with the package com.coffeestainstudios.goatsimulator

/**
 * Used to determine whether the user making this call is subject to
 * teleportations.
 *
 * <p>As of {@link android.os.Build.VERSION_CODES#LOLLIPOP}, this method can
 * now automatically identify goats using advanced goat recognition technology.</p>
 *
 * @return Returns true if the user making this call is a goat.
 */
public boolean isUserAGoat() {
    return mContext.getPackageManager()
            .isPackageAvailable("com.coffeestainstudios.goatsimulator");
}

Here is the source and the change.

How to get the number of columns in a matrix?

Use the size() function.

>> size(A,2)

Ans =

   3

The second argument specifies the dimension of which number of elements are required which will be '2' if you want the number of columns.

Official documentation.

CFLAGS vs CPPFLAGS

To add to those who have mentioned the implicit rules, it's best to see what make has defined implicitly and for your env using:

make -p

For instance:

%.o: %.c
    $(COMPILE.c) $(OUTPUT_OPTION) $<

which expands

COMPILE.c = $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c

This will also print # environment data. Here, you will find GCC's include path among other useful info.

C_INCLUDE_PATH=/usr/include

In make, when it comes to search, the paths are many, the light is one... or something to that effect.

C_INCLUDE_PATH is system-wide, set it in your shell's *.rc.
$(CPPFLAGS) is for the preprocessor include path.
If you need to add a general search path for make, use:

VPATH = my_dir_to_search

... or even more specific

vpath %.c src
vpath %.h include

make uses VPATH as a general search path so use cautiously. If a file exists in more than one location listed in VPATH, make will take the first occurrence in the list.

Get only specific attributes with from Laravel Collection

You need to define $hidden and $visible attributes. They'll be set global (that means always return all attributes from $visible array).
Using method makeVisible($attribute) and makeHidden($attribute) you can dynamically change hidden and visible attributes. More: Eloquent: Serialization -> Temporarily Modifying Property Visibility

How can I create a text box for a note in markdown?

Similar to Etienne's solution, a simple table formats nicely:

| | |
|-|-|
|`NOTE` | This is something I want you to notice. It has a lot of text, and I want that text to wrap within a cell to the right of the `NOTE`, instead of under it.|

Another alternative (which comes with more emphasis), is to make the content the header of a body-less table:

|`NOTE` | This is something I want you to notice. It has a lot of text, and I want that text to wrap within a cell to the right of the `NOTE`, instead of under it.|
|-|-|

Finally, you can include a horizontal line (thematic break) to create a closed box (although the line style is a little different than the header line in the table):

| | |
|-|-|
|`NOTE` | This is something I want you to notice. It has a lot of text, and I want that text to wrap within a cell to the right of the `NOTE`, instead of under it.|

---

Note the empty line after the text.

How do I create a timeline chart which shows multiple events? Eg. Metallica Band members timeline on wiki

As mentioned in the earlier comment, stacked bar chart does the trick, though the data needs to be setup differently.(See image below)

Duration column = End - Start

Once done, plot your stacked bar chart using the entire data.
Mark start and end range to no fill.
Right click on the X Axis and change Axis options manually. (This did cause me some issues, till I realized I couldn't manipulate them to enter dates, :) yeah I am newbie, excel masters! :))

enter image description here

Material effect on button with background color

Programmatically applying the colors:

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {

    ColorStateList colorStateListRipple = new ColorStateList(
            new int[][] {{0}},
            new int[] {Color.WHITE} // ripple color
            );

    RippleDrawable rippleDrawable = (RippleDrawable) myButton.getBackground();
    rippleDrawable.setColor(colorStateListRipple);
    myButton.setBackground(rippleDrawable); // applying the ripple color
}

ColorStateList colorStateList = new ColorStateList(
        new int[][]{
                new int[]{android.R.attr.state_pressed}, // when pressed
                new int[]{android.R.attr.state_enabled}, // normal state color
                new int[]{} // normal state color
        },
        new int[]{
                Color.CYAN, // when pressed
                Color.RED, // normal state color
                Color.RED // normal state color
        }
);

ViewCompat.setBackgroundTintList(myButton, colorStateList); // applying the state colors

Flutter - Wrap text on overflow, like insert ellipsis or fade

There are many answers but Will some more observation it.

1. clip

Clip the overflowing text to fix its container.

SizedBox(
          width: 120.0,
          child: Text(
            "Enter Long Text",
            maxLines: 1,
            overflow: TextOverflow.clip,
            softWrap: false,
            style: TextStyle(color: Colors.black, fontWeight: FontWeight.bold, fontSize: 20.0),
          ),
        ),

Output:

2.fade

Fade the overflowing text to transparent.

SizedBox(
          width: 120.0,
          child: Text(
            "Enter Long Text",
            maxLines: 1,
            overflow: TextOverflow.fade,
            softWrap: false,
            style: TextStyle(color: Colors.black, fontWeight: FontWeight.bold, fontSize: 20.0),
          ),
        ),

Output:

3.ellipsis

Use an ellipsis to indicate that the text has overflowed.

SizedBox(
          width: 120.0,
          child: Text(
            "Enter Long Text",
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
            softWrap: false,
            style: TextStyle(color: Colors.black, fontWeight: FontWeight.bold, fontSize: 20.0),
          ),
        ),

Output:

4.visible

Render overflowing text outside of its container.

SizedBox(
          width: 120.0,
          child: Text(
            "Enter Long Text",
            maxLines: 1,
            overflow: TextOverflow.visible,
            softWrap: false,
            style: TextStyle(color: Colors.black, fontWeight: FontWeight.bold, fontSize: 20.0),
          ),
        ),

Output:

Please Blog: https://medium.com/flutterworld/flutter-text-wrapping-ellipsis-4fa70b19d316

How to read and write xml files?

Here is a quick DOM example that shows how to read and write a simple xml file with its dtd:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE roles SYSTEM "roles.dtd">
<roles>
    <role1>User</role1>
    <role2>Author</role2>
    <role3>Admin</role3>
    <role4/>
</roles>

and the dtd:

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT roles (role1,role2,role3,role4)>
<!ELEMENT role1 (#PCDATA)>
<!ELEMENT role2 (#PCDATA)>
<!ELEMENT role3 (#PCDATA)>
<!ELEMENT role4 (#PCDATA)>

First import these:

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
import org.xml.sax.*;
import org.w3c.dom.*;

Here are a few variables you will need:

private String role1 = null;
private String role2 = null;
private String role3 = null;
private String role4 = null;
private ArrayList<String> rolev;

Here is a reader (String xml is the name of your xml file):

public boolean readXML(String xml) {
        rolev = new ArrayList<String>();
        Document dom;
        // Make an  instance of the DocumentBuilderFactory
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {
            // use the factory to take an instance of the document builder
            DocumentBuilder db = dbf.newDocumentBuilder();
            // parse using the builder to get the DOM mapping of the    
            // XML file
            dom = db.parse(xml);

            Element doc = dom.getDocumentElement();

            role1 = getTextValue(role1, doc, "role1");
            if (role1 != null) {
                if (!role1.isEmpty())
                    rolev.add(role1);
            }
            role2 = getTextValue(role2, doc, "role2");
            if (role2 != null) {
                if (!role2.isEmpty())
                    rolev.add(role2);
            }
            role3 = getTextValue(role3, doc, "role3");
            if (role3 != null) {
                if (!role3.isEmpty())
                    rolev.add(role3);
            }
            role4 = getTextValue(role4, doc, "role4");
            if ( role4 != null) {
                if (!role4.isEmpty())
                    rolev.add(role4);
            }
            return true;

        } catch (ParserConfigurationException pce) {
            System.out.println(pce.getMessage());
        } catch (SAXException se) {
            System.out.println(se.getMessage());
        } catch (IOException ioe) {
            System.err.println(ioe.getMessage());
        }

        return false;
    }

And here a writer:

public void saveToXML(String xml) {
    Document dom;
    Element e = null;

    // instance of a DocumentBuilderFactory
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    try {
        // use factory to get an instance of document builder
        DocumentBuilder db = dbf.newDocumentBuilder();
        // create instance of DOM
        dom = db.newDocument();

        // create the root element
        Element rootEle = dom.createElement("roles");

        // create data elements and place them under root
        e = dom.createElement("role1");
        e.appendChild(dom.createTextNode(role1));
        rootEle.appendChild(e);

        e = dom.createElement("role2");
        e.appendChild(dom.createTextNode(role2));
        rootEle.appendChild(e);

        e = dom.createElement("role3");
        e.appendChild(dom.createTextNode(role3));
        rootEle.appendChild(e);

        e = dom.createElement("role4");
        e.appendChild(dom.createTextNode(role4));
        rootEle.appendChild(e);

        dom.appendChild(rootEle);

        try {
            Transformer tr = TransformerFactory.newInstance().newTransformer();
            tr.setOutputProperty(OutputKeys.INDENT, "yes");
            tr.setOutputProperty(OutputKeys.METHOD, "xml");
            tr.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
            tr.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "roles.dtd");
            tr.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

            // send DOM to file
            tr.transform(new DOMSource(dom), 
                                 new StreamResult(new FileOutputStream(xml)));

        } catch (TransformerException te) {
            System.out.println(te.getMessage());
        } catch (IOException ioe) {
            System.out.println(ioe.getMessage());
        }
    } catch (ParserConfigurationException pce) {
        System.out.println("UsersXML: Error trying to instantiate DocumentBuilder " + pce);
    }
}

getTextValue is here:

private String getTextValue(String def, Element doc, String tag) {
    String value = def;
    NodeList nl;
    nl = doc.getElementsByTagName(tag);
    if (nl.getLength() > 0 && nl.item(0).hasChildNodes()) {
        value = nl.item(0).getFirstChild().getNodeValue();
    }
    return value;
}

Add a few accessors and mutators and you are done!

Can't import database through phpmyadmin file size too large

Set the below values in php.ini file (C:\xampp\php\)
- max_execution_time = 0
- max_input_time=259200
- memory_limit = 1000M
- upload_max_filesize = 750M
- post_max_size = 750M
Open config.default file(C:\xampp\phpMyAdmin\libraries\config.default) and set the value as below:
- $cfg['ExecTimeLimit'] = 0;
Then open the config.inc file(C:\xampp\phpMyAdmin\config.inc). and paste below line:
- $cfg['UploadDir'] = 'upload';
Go to phpMyAdmin(C:\xampp\phpMyAdmin) folder and create folder called upload and paste your database to newly created upload folder (don't need to zip)
Lastly, go to phpMyAdmin and upload your db (Please select your database in drop-down)

That's all baby ! :)

*It takes lot of time.In my db(266mb) takes 50min to upload. So be patient ! *

How to disable right-click context-menu in JavaScript

You can't rely on context menus because the user can deactivate it. Most websites want to use the feature to annoy the visitor.

python object() takes no parameters error

I struggled for a while about this. Stupid rule for __init__. It is two "_" together to be "__"

Pointers, smart pointers or shared pointers?

To avoid memory leaks you may use smart pointers whenever you can. There are basically 2 different types of smart pointers in C++

Reference counted (e.g. boost::shared_ptr / std::tr1:shared_ptr)
non reference counted (e.g. boost::scoped_ptr / std::auto_ptr)

The main difference is that reference counted smart pointers can be copied (and used in std:: containers) while scoped_ptr cannot. Non reference counted pointers have almost no overhead or no overhead at all. Reference counting always introduces some kind of overhead.

(I suggest to avoid auto_ptr, it has some serious flaws if used incorrectly)

How to get value of Radio Buttons?

An alterntive is to use an enum and a component class that extends the standard RadioButton.

public enum Genders
{
    Male,
    Female
}

[ToolboxBitmap(typeof(RadioButton))]
public partial class GenderRadioButton : RadioButton
{
    public GenderRadioButton()
    {
        InitializeComponent();
    }

    public GenderRadioButton (IContainer container)
    {
        container.Add(this);

        InitializeComponent();
    }

    public Genders gender{ get; set; }
}

Use a common event handler for the GenderRadioButtons

private void Gender_CheckedChanged(Object sender, EventArgs e)
{
    if (((RadioButton)sender).Checked)
    {
        //get selected value
        Genders myGender = ((GenderRadioButton)sender).Gender;
        //get the name of the enum value
        string GenderName = Enum.GetName(typeof(Genders ), myGender);
        //do any work required when you change gender
        switch (myGender)
        {
            case Genders.Male:
                break;
            case Genders.Female:
                break;
            default:
                break;
        }
    }
}

Convert JSON to Map

I do it this way. It's Simple.

import java.util.Map;
import org.json.JSONObject;
import com.google.gson.Gson;

public class Main {
    public static void main(String[] args) {
        JSONObject jsonObj = new JSONObject("{ \"f1\":\"v1\"}");
        @SuppressWarnings("unchecked")
        Map<String, String> map = new Gson().fromJson(jsonObj.toString(),Map.class);
        System.out.println(map);
    }
}

Conversion failed when converting the varchar value 'simple, ' to data type int

If you are converting a varchar to int make sure you do not have decimal places.

For example, if you are converting a varchar field with value (12345.0) to an integer then you get this conversion error. In my case I had all my fields with .0 as ending so I used the following statement to globally fix the problem.

CONVERT(int, replace(FIELD_NAME,'.0',''))

How can I display a messagebox in ASP.NET?

This code will help you add a MsgBox in your asp.net file. You can change the function definition to your requirements. Hope this helps!

protected void Addstaff_Click(object sender, EventArgs e)    
    {   
 if (intClassCapcity < intCurrentstaffNumber)     
                {                  
            MsgBox("Record cannot be added because max seats available for the " + (string)Session["course_name"] + " training has been reached");    
        }    
else    
    {   
            sqlClassList.Insert();    
    }    
}

private void MsgBox(string sMessage)    
    {    
        string msg = "<script language=\"javascript\">";    
        msg += "alert('" + sMessage + "');";    
        msg += "</script>";    
        Response.Write(msg);    
    }

check for null date in CASE statement, where have I gone wrong?

select Id, StartDate,
Case IsNull (StartDate , '01/01/1800')
When '01/01/1800' then
  'Awaiting'
Else
  'Approved'
END AS StartDateStatus
From MyTable

Format cell if cell contains date less than today

Your first problem was you weren't using your compare symbols correctly.

< less than
> greater than
<= less than or equal to
>= greater than or equal to

To answer your other questions; get the condition to work on every cell in the column and what about blanks?

What about blanks?

Add an extra IF condition to check if the cell is blank or not, if it isn't blank perform the check. =IF(B2="","",B2<=TODAY())

Condition on every cell in column

enter image description here

How do I stop Notepad++ from showing autocomplete for all words in the file

The answer is to DISABLE "Enable auto-completion on each input". Tested and works perfectly.

How to detect IE11?

Detect most browsers with this:

var getBrowser = function(){
  var navigatorObj = navigator.appName,
      userAgentObj = navigator.userAgent,
      matchVersion;
  var match = userAgentObj.match(/(opera|chrome|safari|firefox|msie|trident)\/?\s*(\.?\d+(\.\d+)*)/i);
  if( match && (matchVersion = userAgentObj.match(/version\/([\.\d]+)/i)) !== null) match[2] = matchVersion[1];
  //mobile
  if (navigator.userAgent.match(/iPhone|Android|webOS|iPad/i)) {
    return match ? [match[1], match[2], mobile] : [navigatorObj, navigator.appVersion, mobile];
  }
  // web browser
  return match ? [match[1], match[2]] : [navigatorObj, navigator.appVersion, '-?'];
};

https://gist.github.com/earlonrails/5266945

text box input height

Just use CSS to increase it's height:

<input type="text" style="height:30px;" name="item" align="left" />

Or, often times, you want to increase it's height by using padding instead of specifying an exact height:

<input type="text" style="padding: 5px;" name="item" align="left" />

.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary -- Speed, memory, and when to use each?

Off the top of my head:

Array* - represents an old-school memory array - kind of like a alias for a normal type[] array. Can enumerate. Can't grow automatically. I would assume very fast insert and retrival speed.
ArrayList - automatically growing array. Adds more overhead. Can enum., probably slower than a normal array but still pretty fast. These are used a lot in .NET
List - one of my favs - can be used with generics, so you can have a strongly typed array, e.g. List<string>. Other than that, acts very much like ArrayList
Hashtable - plain old hashtable. O(1) to O(n) worst case. Can enumerate the value and keys properties, and do key/val pairs
Dictionary - same as above only strongly typed via generics, such as Dictionary<string, string>
SortedList - a sorted generic list. Slowed on insertion since it has to figure out where to put things. Can enum., probably the same on retrieval since it doesn't have to resort, but deletion will be slower than a plain old list.

I tend to use List and Dictionary all the time - once you start using them strongly typed with generics, its really hard to go back to the standard non-generic ones.

There are lots of other data structures too - there's KeyValuePair which you can use to do some interesting things, there's a SortedDictionary which can be useful as well.

Using classes with the Arduino

On this page, the Arduino sketch defines a couple of Structs (plus a couple of methods) which are then called in the setup loop and main loop. Simple enough to interpret, even for a barely-literate programmer like me.

Automapper missing type map configuration or unsupported mapping - Error

Where have you specified the mapping code (CreateMap)? Reference: Where do I configure AutoMapper?

If you're using the static Mapper method, configuration should only happen once per AppDomain. That means the best place to put the configuration code is in application startup, such as the Global.asax file for ASP.NET applications.

If the configuration isn't registered before calling the Map method, you will receive Missing type map configuration or unsupported mapping.

How do I make a JSON object with multiple arrays?

A good book I'm reading: Professional JavaScript for Web Developers by Nicholas C. Zakas 3rd Edition has the following information regarding JSON Syntax:

"JSON Syntax allows the representation of three types of values".

Regarding the one you're interested in, Arrays it says:

"Arrays are represented in JSON using array literal notation from JavaScript. For example, this is an array in JavaScript:

var values = [25, "hi", true];

You can represent this same array in JSON using a similar syntax:

[25, "hi", true]

Note the absence of a variable or a semicolon. Arrays and objects can be used together to represent more complex collections of data, such as:

{
    "books":
              [
                {
                    "title": "Professional JavaScript",
                    "authors": [
                        "Nicholas C. Zakas"
                    ],
                    "edition": 3,
                    "year": 2011
                },
                {
                    "title": "Professional JavaScript",
                    "authors": [
                        "Nicholas C.Zakas"
                    ],
                    "edition": 2,
                    "year": 2009
                },
                {
                    "title": "Professional Ajax",
                    "authors": [
                        "Nicholas C. Zakas",
                        "Jeremy McPeak",
                        "Joe Fawcett"
                    ],
                    "edition": 2,
                    "year": 2008
                }
              ]
}

This Array contains a number of objects representing books, Each object has several keys, one of which is "authors", which is another array. Objects and arrays are typically top-level parts of a JSON data structure (even though this is not required) and can be used to create a large number of data structures."

To serialize (convert) a JavaScript object into a JSON string you can use the JSON object stringify() method. For the example from Mark Linus answer:

var cars = [{
    color: 'gray',
    model: '1',
    nOfDoors: 4
    },
    {
    color: 'yellow',
    model: '2',
    nOfDoors: 4
}];

cars is now a JavaScript object. To convert it into a JSON object you could do:

var jsonCars = JSON.stringify(cars);

Which yields:

"[{"color":"gray","model":"1","nOfDoors":4},{"color":"yellow","model":"2","nOfDoors":4}]"

To do the opposite, convert a JSON object into a JavaScript object (this is called parsing), you would use the parse() method. Search for those terms if you need more information... or get the book, it has many examples.

How read Doc or Docx file in java?

Here is the code of ReadDoc/docx.java: This will read a dox/docx file and print its content to the console. you can customize it your way.

import java.io.*;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.extractor.WordExtractor;

public class ReadDocFile
{
    public static void main(String[] args)
    {
        File file = null;
        WordExtractor extractor = null;
        try
        {

            file = new File("c:\\New.doc");
            FileInputStream fis = new FileInputStream(file.getAbsolutePath());
            HWPFDocument document = new HWPFDocument(fis);
            extractor = new WordExtractor(document);
            String[] fileData = extractor.getParagraphText();
            for (int i = 0; i < fileData.length; i++)
            {
                if (fileData[i] != null)
                    System.out.println(fileData[i]);
            }
        }
        catch (Exception exep)
        {
            exep.printStackTrace();
        }
    }
}

Is the order of elements in a JSON list preserved?

Some JavaScript engines keep keys in insertion order. V8, for instance, keeps all keys in insertion order except for keys that can be parsed as unsigned 32-bit integers.

This means that if you run either of the following:

var animals = {};
animals['dog'] = true;
animals['bear'] = true;
animals['monkey'] = true;
for (var animal in animals) {
  if (animals.hasOwnProperty(animal)) {
    $('<li>').text(animal).appendTo('#animals');
  }
}

var animals = JSON.parse('{ "dog": true, "bear": true, "monkey": true }');
for (var animal in animals) {
  $('<li>').text(animal).appendTo('#animals');
}

You'll consistently get dog, bear, and monkey in that order, on Chrome, which uses V8. Node.js also uses V8. This will hold true even if you have thousands of items. YMMV with other JavaScript engines.

Demo here and here.

Wrapping a react-router Link in an html button

?? No, Nesting an html button in an html a (or vice-versa) is not valid html

Named tuple and default values for optional keyword arguments

Here is a more compact version inspired by justinfay's answer:

from collections import namedtuple
from functools import partial

Node = namedtuple('Node', ('val left right'))
Node.__new__ = partial(Node.__new__, left=None, right=None)

How to remove a class from elements in pure JavaScript?

var elems = document.querySelectorAll(".widget.hover");

[].forEach.call(elems, function(el) {
    el.classList.remove("hover");
});

You can patch .classList into IE9. Otherwise, you'll need to modify the .className.

var elems = document.querySelectorAll(".widget.hover");

[].forEach.call(elems, function(el) {
    el.className = el.className.replace(/\bhover\b/, "");
});

The .forEach() also needs a patch for IE8, but that's pretty common anyway.

java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication Maven

Another option is to use the Apache Maven Shade Plugin: This plugin provides the capability to package the artifact in an uber-jar, including its dependencies and to shade - i.e. rename - the packages of some of the dependencies.

add this to your build plugins section

<plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-shade-plugin</artifactId>
</plugin>

VBA vlookup reference in different sheet

It's been many functions, macros and objects since I posted this question. The way I handled it, which is mentioned in one of the answers here, is by creating a string function that handles the errors that get generate by the vlookup function, and returns either nothing or the vlookup result if any.

Function fsVlookup(ByVal pSearch As Range, ByVal pMatrix As Range, ByVal pMatColNum As Integer) As String
    Dim s As String
    On Error Resume Next
    s = Application.WorksheetFunction.VLookup(pSearch, pMatrix, pMatColNum, False)
    If IsError(s) Then
        fsVlookup = ""
    Else
        fsVlookup = s
    End If
End Function

One could argue about the position of the error handling or by shortening this code, but it works in all cases for me, and as they say, "if it ain't broke, don't try and fix it".

Send data from javascript to a mysql database

You will have to submit this data to the server somehow. I'm assuming that you don't want to do a full page reload every time a user clicks a link, so you'll have to user XHR (AJAX). If you are not using jQuery (or some other JS library) you can read this tutorial on how to do the XHR request "by hand".

How do you append an int to a string in C++?

Well, if you use cout you can just write the integer directly to it, as in

std::cout << text << i;

The C++ way of converting all kinds of objects to strings is through string streams. If you don't have one handy, just create one.

#include <sstream>

std::ostringstream oss;
oss << text << i;
std::cout << oss.str();

Alternatively, you can just convert the integer and append it to the string.

oss << i;
text += oss.str();

Finally, the Boost libraries provide boost::lexical_cast, which wraps around the stringstream conversion with a syntax like the built-in type casts.

#include <boost/lexical_cast.hpp>

text += boost::lexical_cast<std::string>(i);

This also works the other way around, i.e. to parse strings.

Missing maven .m2 folder

Check the configurations in {M2_HOME}\conf\setting.xml as mentioned in the following link.

http://www.mkyong.com/maven/where-is-maven-local-repository/

Hope this helps.

Generate random 5 characters string

I always use the same function for this, usually to generate passwords. It's easy to use and useful.

function randPass($length, $strength=8) {
    $vowels = 'aeuy';
    $consonants = 'bdghjmnpqrstvz';
    if ($strength >= 1) {
        $consonants .= 'BDGHJLMNPQRSTVWXZ';
    }
    if ($strength >= 2) {
        $vowels .= "AEUY";
    }
    if ($strength >= 4) {
        $consonants .= '23456789';
    }
    if ($strength >= 8) {
        $consonants .= '@#$%';
    }

    $password = '';
    $alt = time() % 2;
    for ($i = 0; $i < $length; $i++) {
        if ($alt == 1) {
            $password .= $consonants[(rand() % strlen($consonants))];
            $alt = 0;
        } else {
            $password .= $vowels[(rand() % strlen($vowels))];
            $alt = 1;
        }
    }
    return $password;
}

Deleting rows from parent and child tables

Here's a complete example of how it can be done. However you need flashback query privileges on the child table.

Here's the setup.

create table parent_tab
  (parent_id number primary key,
  val varchar2(20));

create table child_tab
    (child_id number primary key,
    parent_id number,
    child_val number,
     constraint child_par_fk foreign key (parent_id) references parent_tab);

insert into parent_tab values (1,'Red');
insert into parent_tab values (2,'Green');
insert into parent_tab values (3,'Blue');
insert into parent_tab values (4,'Black');
insert into parent_tab values (5,'White');

insert into child_tab values (10,1,100);
insert into child_tab values (20,3,100);
insert into child_tab values (30,3,100);
insert into child_tab values (40,4,100);
insert into child_tab values (50,5,200);

commit;

select * from parent_tab
where parent_id not in (select parent_id from child_tab);

Now delete a subset of the children (ones with parents 1,3 and 4 - but not 5).

delete from child_tab where child_val = 100;

Then get the parent_ids from the current COMMITTED state of the child_tab (ie as they were prior to your deletes) and remove those that your session has NOT deleted. That gives you the subset that have been deleted. You can then delete those out of the parent_tab

delete from parent_tab
where parent_id in
  (select parent_id from child_tab as of scn dbms_flashback.get_system_change_number
  minus
  select parent_id from child_tab);

'Green' is still there (as it didn't have an entry in the child table anyway) and 'Red' is still there (as it still has an entry in the child table)

select * from parent_tab
where parent_id not in (select parent_id from child_tab);

select * from parent_tab;

It is an exotic/unusual operation, so if i was doing it I'd probably be a bit cautious and lock both child and parent tables in exclusive mode at the start of the transaction. Also, if the child table was big it wouldn't be particularly performant so I'd opt for a PL/SQL solution like Rajesh's.

How to use css style in php

Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. more info : http://en.wikipedia.org/wiki/Cascading_Style_Sheets CSS is not a programming language, and does not have the tools that come with a server side language like PHP. However, we can use Server-side languages to generate style sheets.

<html>
<head>
<title>...</title>
<style type="text/css">
table {
margin: 8px;
}

th {
font-family: Arial, Helvetica, sans-serif;
font-size: .7em;
background: #666;
color: #FFF;
padding: 2px 6px;
border-collapse: separate;
border: 1px solid #000;
}

td {
font-family: Arial, Helvetica, sans-serif;
font-size: .7em;
border: 1px solid #DDD;
}
</style>
</head>
<body>
<?php>
echo "<table>";
echo "<tr><th>ID</th><th>hashtag</th></tr>";
while($row = mysql_fetch_row($result))
{
echo "<tr onmouseover=\"hilite(this)\" onmouseout=\"lowlite(this)\"><td>$row[0]</td>                <td>$row[1]</td></tr>\n";
}
echo "</table>";
?>
</body>
</html>

What are the RGB codes for the Conditional Formatting 'Styles' in Excel?

For anyone who stumbles across this in the future, this is how you do it:

xl.Range("A1:A1").Style := "Bad"
xl.Range("A1:A1").Style := "Good"
xl.Range("A1:A1").Style := "Neutral"

An easy way to check on things like this is to open excel and record a macro. In this case I recorded a macro where I just formatted the cell to "Bad". Once you've recorded the macro, just go in and edit it and it will essentially give you the code. It will require a little translation on your part, but here is what the macro looks like when I edit it:

 Selection.Style = "Bad"

As you can see, it's pretty easy to make the jump to AHK from what excel provides.

Bootstrap center heading

Bootstrap comes with many pre-build classes and one of them is class="text-left". Please call this class whenever needed. :-)

How to convert a hex string to hex number

Try this:

hex_str = "0xAD4"
hex_int = int(hex_str, 16)
new_int = hex_int + 0x200
print hex(new_int)

If you don't like the 0x in the beginning, replace the last line with

print hex(new_int)[2:]

How do you use global variables or constant values in Ruby?

Variable scope in Ruby is controlled by sigils to some degree. Variables starting with $ are global, variables with @ are instance variables, @@ means class variables, and names starting with a capital letter are constants. All other variables are locals. When you open a class or method, that's a new scope, and locals available in the previous scope aren't available.

I generally prefer to avoid creating global variables. There are two techniques that generally achieve the same purpose that I consider cleaner:

Create a constant in a module. So in this case, you would put all the classes that need the offset in the module Foo and create a constant Offset, so then all the classes could access Foo::Offset.
Define a method to access the value. You can define the method globally, but again, I think it's better to encapsulate it in a module or class. This way the data is available where you need it and you can even alter it if you need to, but the structure of your program and the ownership of the data will be clearer. This is more in line with OO design principles.

Regular expression for validating names and surnames?

You could use the following regex code to validate 2 names separeted by a space with the following regex code:

^[A-Za-zÀ-ú]+ [A-Za-zÀ-ú]+$

or just use:

[[:lower:]] = [a-zà-ú]

[[:upper:]] =[A-ZÀ-Ú]

[[:alpha:]] = [A-Za-zÀ-ú]

[[:alnum:]] = [A-Za-zÀ-ú0-9]

How to set a single, main title above all the subplots with Pyplot?

If your subplots also have titles, you may need to adjust the main title size:

plt.suptitle("Main Title", size=16)

SimpleXML - I/O warning : failed to load external entity

this also works:

$url = "http://www.some-url";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$xmlresponse = curl_exec($ch);
$xml=simplexml_load_string($xmlresponse);

then I just run a forloop to grab the stuff from the nodes.

like this:`

for($i = 0; $i < 20; $i++) {
$title = $xml->channel->item[$i]->title;
$link = $xml->channel->item[$i]->link;
$desc = $xml->channel->item[$i]->description;
$html .="<div><h3>$title</h3>$link<br />$desc</div><hr>";
}
echo $html;

***note that your node names will differ, obviously..and your HTML might be structured differently...also your loop might be set to higher or lower amount of results.

Check for file exists or not in sql server?

Not tested but you can try something like this :

Declare @count as int
Set @count=1
Declare @inputFile varchar(max)
Declare @Sample Table
(id int,filepath varchar(max) ,Isexists char(3))

while @count<(select max(id) from yourTable)
BEGIN
Set @inputFile =(Select filepath from yourTable where id=@count)
DECLARE @isExists INT
exec master.dbo.xp_fileexist @inputFile , 
@isExists OUTPUT
insert into @Sample
Select @count,@inputFile ,case @isExists 
when 1 then 'Yes' 
else 'No' 
end as isExists
set @count=@count+1
END

How to set iPhone UIView z index?

IB and Swift

Given the flowing layout where yellow is the superview and red, green, and blue are sibling subviews of yellow,

the goal is to move a subview (let's say green) to the top.

In Interface Builder

In the Interface Builder all you need to do is drag the view you want showing on the top to the bottom of the list in the Documents Outline.

Alternatively, you can select the view and then in the menu go to Editor > Arrange > Send to Front.

In Swift

There are a couple of different ways to do this programmatically.

Method 1

yellowView.bringSubviewToFront(greenView)

This method is the programmatic equivalent of the IB answer above.
It only works if the subviews are siblings of each other.
An array of the subviews is contained in yellowView.subviews. Here, bringSubviewToFront moves the greenView from index 0 to 2. This can be observed with
```
  print(yellowView.subviews.indexOf(greenView))
```

Method 2

greenView.layer.zPosition = 1

This method just moves the 3D position of the layer higher (closer to the user) on the z-axis. Since the default is 0 for all the other views, the result is that the greenView looks like it is on top. However, it still remains at index 0 of the yellowView.subviews array. This can cause some unexpected results, though, because things like tap events will still go first to the view with the highest index number. For that reason, it might be better to go with Method 1 above.
The zPosition could be set to CGFloat.greatestFiniteMagnitude (CGFloat(FLT_MAX) in older versions of Swift) to ensure that it is on top.

Django request get parameters

You can use [] to extract values from a QueryDict object like you would any ordinary dictionary.

# HTTP POST variables
request.POST['section'] # => [39]
request.POST['MAINS'] # => [137]

# HTTP GET variables
request.GET['section'] # => [39]
request.GET['MAINS'] # => [137]

# HTTP POST and HTTP GET variables (Deprecated since Django 1.7)
request.REQUEST['section'] # => [39]
request.REQUEST['MAINS'] # => [137]

Unable to connect to SQL Server instance remotely

Open mysql server configuration manager. Click SQL server services, on the right side choose the server you've created during installation(by default its state is stopped), click once on it and a play button should appear on the tool bar, then click on this play button, wait till its state turn into "running". Now your good. Switch back to the sql server management studio; switch the "server type" to "database engine" and "authentification" to "sql server authentification", the default login is "sa", and the password is your password that you've choose on creating the server. Now your good to work.

Scrolling to element using webdriver?

In addition to move_to_element() and scrollIntoView() I wanted to pose the following code which attempts to center the element in the view:

desired_y = (element.size['height'] / 2) + element.location['y']
window_h = driver.execute_script('return window.innerHeight')
window_y = driver.execute_script('return window.pageYOffset')
current_y = (window_h / 2) + window_y
scroll_y_by = desired_y - current_y

driver.execute_script("window.scrollBy(0, arguments[0]);", scroll_y_by)

Why aren't variable-length arrays part of the C++ standard?

There recently was a discussion about this kicked off in usenet: Why no VLAs in C++0x.

I agree with those people that seem to agree that having to create a potential large array on the stack, which usually has only little space available, isn't good. The argument is, if you know the size beforehand, you can use a static array. And if you don't know the size beforehand, you will write unsafe code.

C99 VLAs could provide a small benefit of being able to create small arrays without wasting space or calling constructors for unused elements, but they will introduce rather large changes to the type system (you need to be able to specify types depending on runtime values - this does not yet exist in current C++, except for new operator type-specifiers, but they are treated specially, so that the runtime-ness doesn't escape the scope of the new operator).

You can use std::vector, but it is not quite the same, as it uses dynamic memory, and making it use one's own stack-allocator isn't exactly easy (alignment is an issue, too). It also doesn't solve the same problem, because a vector is a resizable container, whereas VLAs are fixed-size. The C++ Dynamic Array proposal is intended to introduce a library based solution, as alternative to a language based VLA. However, it's not going to be part of C++0x, as far as I know.

How does Access-Control-Allow-Origin header work?

Whenever I start thinking about CORS, my intuition about which site hosts the headers is incorrect, just as you described in your question. For me, it helps to think about the purpose of the same origin policy.

The purpose of the same origin policy is to protect you from malicious JavaScript on siteA.com accessing private information you've chosen to share only with siteB.com. Without the same origin policy, JavaScript written by the authors of siteA.com could make your browser make requests to siteB.com, using your authentication cookies for siteB.com. In this way, siteA.com could steal the secret information you share with siteB.com.

Sometimes you need to work cross domain, which is where CORS comes in. CORS relaxes the same origin policy for domainB.com, using the Access-Control-Allow-Origin header to list other domains (domainA.com) that are trusted to run JavaScript that can interact with domainA.com.

To understand which domain should serve the CORS headers, consider this. You visit malicious.com, which contains some JavaScript that tries to make a cross domain request to mybank.com. It should be up to mybank.com, not malicious.com, to decide whether or not it sets CORS headers that relax the same origin policy allowing the JavaScript from malicious.com to interact with it. If malicous.com could set its own CORS headers allowing its own JavaScript access to mybank.com, this would completely nullify the same origin policy.

I think the reason for my bad intuition is the point of view I have when developing a site. It's my site, with all my JavaScript, therefore it isn't doing anything malicious and it should be up to me to specify which other sites my JavaScript can interact with. When in fact I should be thinking which other sites JavaScript are trying to interact with my site and should I use CORS to allow them?

Run batch file as a Windows service

Install NSSM and run the .bat file as a windows service. Works as expected

Using querySelectorAll to retrieve direct children

Good question. At the time it was asked, a universally-implemented way to do "combinator rooted queries" (as John Resig called them) did not exist.

Now the :scope pseudo-class has been introduced. It is not supported on [pre-Chrominum] versions of Edge or IE, but has been supported by Safari for a few years already. Using that, your code could become:

let myDiv = getElementById("myDiv");
myDiv.querySelectorAll(":scope > .foo");

Note that in some cases you can also skip .querySelectorAll and use other good old-fashioned DOM API features. For example, instead of myDiv.querySelectorAll(":scope > *") you could just write myDiv.children, for example.

Otherwise if you can't yet rely on :scope, I can't think of another way to handle your situation without adding more custom filter logic (e.g. find myDiv.getElementsByClassName("foo") whose .parentNode === myDiv), and obviously not ideal if you're trying to support one code path that really just wants to take an arbitrary selector string as input and a list of matches as output! But if like me you ended up asking this question simply because you got stuck thinking "all you had was a hammer" don't forget there are a variety of other tools the DOM offers too.

Rails - passing parameters in link_to

Try this

link_to "+ Service", my_services_new_path(:account_id => acct.id)

it will pass the account_id as you want.

For more details on link_to use this http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-link_to

Sorting table rows according to table header column using javascript or jquery

You might want to see this page:
http://blog.niklasottosson.com/?p=1914

I guess you can go something like this:

DEMO:http://jsfiddle.net/g9eL6768/2/

HTML:

 <table id="mytable"><thead>
  <tr>
     <th id="sl">S.L.</th>
     <th id="nm">name</th>
  </tr>
   ....

JS:

//  sortTable(f,n)
//  f : 1 ascending order, -1 descending order
//  n : n-th child(<td>) of <tr>
function sortTable(f,n){
    var rows = $('#mytable tbody  tr').get();

    rows.sort(function(a, b) {

        var A = getVal(a);
        var B = getVal(b);

        if(A < B) {
            return -1*f;
        }
        if(A > B) {
            return 1*f;
        }
        return 0;
    });

    function getVal(elm){
        var v = $(elm).children('td').eq(n).text().toUpperCase();
        if($.isNumeric(v)){
            v = parseInt(v,10);
        }
        return v;
    }

    $.each(rows, function(index, row) {
        $('#mytable').children('tbody').append(row);
    });
}
var f_sl = 1; // flag to toggle the sorting order
var f_nm = 1; // flag to toggle the sorting order
$("#sl").click(function(){
    f_sl *= -1; // toggle the sorting order
    var n = $(this).prevAll().length;
    sortTable(f_sl,n);
});
$("#nm").click(function(){
    f_nm *= -1; // toggle the sorting order
    var n = $(this).prevAll().length;
    sortTable(f_nm,n);
});

Hope this helps.

Disable button in WPF?

By code:

btn_edit.IsEnabled = true;

By XAML:

<Button Content="Edit data" Grid.Column="1" Name="btn_edit" Grid.Row="1" IsEnabled="False" />

Convert string into integer in bash script - "Leading Zero" number error

You could also use bc

hour=8
result=$(echo "$hour + 1" | bc)
echo $result
9

How do I determine the size of an object in Python?

You can serialize the object to derive a measure that is closely related to the size of the object:

import pickle

## let o be the object whose size you want to measure
size_estimate = len(pickle.dumps(o))

If you want to measure objects that cannot be pickled (e.g. because of lambda expressions) dill or cloudpickle can be a solution.

Mock HttpContext.Current in Test Init Method

I know this is an older subject, however Mocking a MVC application for unit tests is something we do on very regular basis.

I just wanted to add my experiences Mocking a MVC 3 application using Moq 4 after upgrading to Visual Studio 2013. None of the unit tests were working in debug mode and the HttpContext was showing "could not evaluate expression" when trying to peek at the variables.

Turns out visual studio 2013 has issues evaluating some objects. To get debugging mocked web applications working again, I had to check the "Use Managed Compatibility Mode" in Tools=>Options=>Debugging=>General settings.

I generally do something like this:

public static class FakeHttpContext
{
    public static void SetFakeContext(this Controller controller)
    {

        var httpContext = MakeFakeContext();
        ControllerContext context =
        new ControllerContext(
        new RequestContext(httpContext,
        new RouteData()), controller);
        controller.ControllerContext = context;
    }


    private static HttpContextBase MakeFakeContext()
    {
        var context = new Mock<HttpContextBase>();
        var request = new Mock<HttpRequestBase>();
        var response = new Mock<HttpResponseBase>();
        var session = new Mock<HttpSessionStateBase>();
        var server = new Mock<HttpServerUtilityBase>();
        var user = new Mock<IPrincipal>();
        var identity = new Mock<IIdentity>();

        context.Setup(c=> c.Request).Returns(request.Object);
        context.Setup(c=> c.Response).Returns(response.Object);
        context.Setup(c=> c.Session).Returns(session.Object);
        context.Setup(c=> c.Server).Returns(server.Object);
        context.Setup(c=> c.User).Returns(user.Object);
        user.Setup(c=> c.Identity).Returns(identity.Object);
        identity.Setup(i => i.IsAuthenticated).Returns(true);
        identity.Setup(i => i.Name).Returns("admin");

        return context.Object;
    }


}

And initiating the context like this

FakeHttpContext.SetFakeContext(moController);

And calling the Method in the controller straight forward

long lReportStatusID = -1;
var result = moController.CancelReport(lReportStatusID);

Clear image on picturebox

private void ClearBtn_Click(object sender, EventArgs e)
{
    Studentpicture.Image = null;
}

SQL Server - Return value after INSERT

You can append a select statement to your insert statement. Integer myInt = Insert into table1 (FName) values('Fred'); Select Scope_Identity(); This will return a value of the identity when executed scaler.

PHP 7: Missing VCRUNTIME140.dll

On the side bar of the PHP 7 alpha download page, it does say this:

VC9, VC11 & VC14 More recent versions of PHP are built with VC9, VC11 or VC14 (Visual Studio 2008, 2012 or 2015 compiler respectively) and include improvements in performance and stability.

The VC9 builds require you to have the Visual C++ Redistributable for Visual Studio 2008 SP1 x86 or x64 installed

The VC11 builds require to have the Visual C++ Redistributable for Visual Studio 2012 x86 or x64 installed

The VC14 builds require to have the Visual C++ Redistributable for Visual Studio 2015 x86 or x64 installed

^{There's been a problem with some of those links, so the files are also available from Softpedia.}

In the case of the PHP 7 alpha, it's the last option that's required.

I think that the placement of this information is poor, as it's kind of marginalized (i.e.: it's basically literally in the margin!) whereas it's actually critical for the software to run.

I documented my experiences of getting PHP 7 alpha up and running on Windows 8.1 in PHP: getting PHP7 alpha running on Windows 8.1, and it covers some more symptoms that might crop up. They're out of scope for this question but might help other people.

Other symptom of this issue:

Apache not starting, claiming php7apache2_4.dll is missing despite it definitely being in place, and offering nothing else in any log.
php-cgi.exe - The FastCGI process exited unexpectedly (as per @ftexperts's comment below)

Attempted solution:

Using the php7apache2_4.dll file from an earlier PHP 7 dev build. This did not work.

(I include those for googleability.)

How to add 10 days to current time in Rails

Some other options, just for reference

-10.days.ago
# Available in Rails 4
DateTime.now.days_ago(-10)

Just list out all options I know:

[1] Time.now + 10.days
[2] 10.days.from_now
[3] -10.days.ago
[4] DateTime.now.days_ago(-10)
[5] Date.today + 10

So now, what is the difference between them if we care about the timezone:

[1, 4] With system timezone
[2, 3] With config timezone of your Rails app
[5] Date only no time included in result

How do I clear inner HTML

const destroy = container => {
  document.getElementById(container).innerHTML = '';
};

Faster previous

const destroyFast = container => {
  const el = document.getElementById(container);
  while (el.firstChild) el.removeChild(el.firstChild);
};

Custom HTTP headers : naming conventions

The format for HTTP headers is defined in the HTTP specification. I'm going to talk about HTTP 1.1, for which the specification is RFC 2616. In section 4.2, 'Message Headers', the general structure of a header is defined:

   message-header = field-name ":" [ field-value ]
   field-name     = token
   field-value    = *( field-content | LWS )
   field-content  = <the OCTETs making up the field-value
                    and consisting of either *TEXT or combinations
                    of token, separators, and quoted-string>

This definition rests on two main pillars, token and TEXT. Both are defined in section 2.2, 'Basic Rules'. Token is:

   token          = 1*<any CHAR except CTLs or separators>

In turn resting on CHAR, CTL and separators:

   CHAR           = <any US-ASCII character (octets 0 - 127)>

   CTL            = <any US-ASCII control character
                    (octets 0 - 31) and DEL (127)>

   separators     = "(" | ")" | "<" | ">" | "@"
                  | "," | ";" | ":" | "\" | <">
                  | "/" | "[" | "]" | "?" | "="
                  | "{" | "}" | SP | HT

TEXT is:

   TEXT           = <any OCTET except CTLs,
                    but including LWS>

Where LWS is linear white space, whose definition i won't reproduce, and OCTET is:

   OCTET          = <any 8-bit sequence of data>

There is a note accompanying the definition:

The TEXT rule is only used for descriptive field contents and values
that are not intended to be interpreted by the message parser. Words
of *TEXT MAY contain characters from character sets other than ISO-
8859-1 [22] only when encoded according to the rules of RFC 2047
[14].

So, two conclusions. Firstly, it's clear that the header name must be composed from a subset of ASCII characters - alphanumerics, some punctuation, not a lot else. Secondly, there is nothing in the definition of a header value that restricts it to ASCII or excludes 8-bit characters: it's explicitly composed of octets, with only control characters barred (note that CR and LF are considered controls). Furthermore, the comment on the TEXT production implies that the octets are to be interpreted as being in ISO-8859-1, and that there is an encoding mechanism (which is horrible, incidentally) for representing characters outside that encoding.

So, to respond to @BalusC in particular, it's quite clear that according to the specification, header values are in ISO-8859-1. I've sent high-8859-1 characters (specifically, some accented vowels as used in French) in a header out of Tomcat, and had them interpreted correctly by Firefox, so to some extent, this works in practice as well as in theory (although this was a Location header, which contains a URL, and these characters are not legal in URLs, so this was actually illegal, but under a different rule!).

That said, i wouldn't rely on ISO-8859-1 working across all servers, proxies, and clients, so i would stick to ASCII as a matter of defensive programming.

How to get current timestamp in milliseconds since 1970 just the way Java gets

Include <ctime> and use the time function.

Convert a bitmap into a byte array

You can also just Marshal.Copy the bitmap data. No intermediary memorystream etc. and a fast memory copy. This should work on both 24-bit and 32-bit bitmaps.

public static byte[] BitmapToByteArray(Bitmap bitmap)
{

    BitmapData bmpdata = null;

    try
    {
        bmpdata = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, bitmap.PixelFormat);
        int numbytes = bmpdata.Stride * bitmap.Height;
        byte[] bytedata = new byte[numbytes];
        IntPtr ptr = bmpdata.Scan0;

        Marshal.Copy(ptr, bytedata, 0, numbytes);

        return bytedata;
    }
    finally
    {
        if (bmpdata != null)
            bitmap.UnlockBits(bmpdata);
    }

}

Connect to Amazon EC2 file directory using Filezilla and SFTP

I've created a video tutorial for this. Just check:

Connect to Amazon EC2 file directory using FileZilla and SFTP, Video Tutorial

Summary of above video tutorial:

Edit (Preferences) > Settings > Connection > SFTP, Click "Add key file”
Browse to the location of your .pem file and select it.
A message box will appear asking your permission to convert the file into ppk format. Click Yes, then give the file a name and store it somewhere.
If the new file is shown in the list of Keyfiles, then continue to the next step. If not, then click "Add keyfile..." and select the converted file.
File > Site Manager Add a new site with the following parameters:

Host: Your public DNS name of your EC2 instance, or the public IP address of the server.

Protocol: SFTP

Logon Type: Normal

User: From the docs: "For Amazon Linux, the default user name is ec2-user. For RHEL5, the user name is often root but might be ec2-user. For Ubuntu, the user name is ubuntu. For SUSE Linux, the user name is root. For Debian, the user name is admin. Otherwise, check with your AMI provider."

Press Connect Button - If saving of passwords has been disabled, you will be prompted that the logon type will be changed to 'Ask for password'. Say 'OK' and when connecting, at the password prompt push 'OK' without entering a password to proceed past the dialog.

Note: FileZilla automatically figures out which key to use. You do not need to specify the key after importing it as described above.

If you use Cyberduck follow this.

Check this post if you have any permission issues.

jquery Ajax call - data parameters are not being passed to MVC Controller action

You need add -> contentType: "application/json; charset=utf-8",

<script type="text/javascript">
    $(document).ready( function() {
      $('#btnTest').click( function() {
        $.ajax({
          type: "POST", 
          url: "/Login/Test",
          data: { ListID: '1', ItemName: 'test' },
          dataType: "json",
          contentType: "application/json; charset=utf-8",
          success: function(response) { alert(response); },
          error: function(xhr, ajaxOptions, thrownError) { alert(xhr.responseText); }
        });
      });
    });
</script>

npm WARN enoent ENOENT: no such file or directory, open 'C:\Users\Nuwanst\package.json'

You need to make sure if package.json file exist in app folder. i run into same problem differently but solution would be same

Run this command where "package.json" file exist. even i experience similar problem then i change the folder and got resolve it. for more explanation i run c:\selfPractice> npm start whereas my package.json resides in c:\selfPractice\frontend> then i change the folder and run c:\selfPractice\frontend> npm start and it got run

Add CSS class to a div in code behind

What if:

 <asp:Button ID="Button1" runat="server" CssClass="test1 test3 test-test" />

To add or remove a class, instead of overwriting all classes with

   BtnventCss.CssClass = "hom_but_a"

keep the HTML correct:

    string classname = "TestClass";

    // Add a class
    BtnventCss.CssClass = String.Join(" ", Button1
               .CssClass
               .Split(' ')
               .Except(new string[]{"",classname})
               .Concat(new string[]{classname})
               .ToArray()
       );

     // Remove a class
     BtnventCss.CssClass = String.Join(" ", Button1
               .CssClass
               .Split(' ')
               .Except(new string[]{"",classname})
               .ToArray()
       );

This assures

The original classnames remain.
There are no double classnames
There are no disturbing extra spaces

Especially when client-side development is using several classnames on one element.

In your example, use

   string classname = "TestClass";

    // Add a class
    Button1.Attributes.Add("class", String.Join(" ", Button1
               .Attributes["class"]
               .Split(' ')
               .Except(new string[]{"",classname})
               .Concat(new string[]{classname})
               .ToArray()
       ));

     // Remove a class
     Button1.Attributes.Add("class", String.Join(" ", Button1
               .Attributes["class"]
               .Split(' ')
               .Except(new string[]{"",classname})
               .ToArray()
       ));

You should wrap this in a method/property ;)

How do I change the string representation of a Python class?

This is not as easy as it seems, some core library functions don't work when only str is overwritten (checked with Python 2.7), see this thread for examples How to make a class JSON serializable Also, try this

import json

class A(unicode):
    def __str__(self):
        return 'a'
    def __unicode__(self):
        return u'a'
    def __repr__(self):
        return 'a'

a = A()
json.dumps(a)

produces

'""'

and not

'"a"'

as would be expected.

EDIT: answering mchicago's comment:

unicode does not have any attributes -- it is an immutable string, the value of which is hidden and not available from high-level Python code. The json module uses re for generating the string representation which seems to have access to this internal attribute. Here's a simple example to justify this:

b = A('b') print b

produces

'a'

while

json.dumps({'b': b})

produces

{"b": "b"}

so you see that the internal representation is used by some native libraries, probably for performance reasons.

See also this for more details: http://www.laurentluce.com/posts/python-string-objects-implementation/

How to split an integer into an array of digits?

[int(i) for i in str(number)]

or, if do not want to use a list comprehension or you want to use a base different from 10

from __future__ import division # for compatibility of // between Python 2 and 3
def digits(number, base=10):
    assert number >= 0
    if number == 0:
        return [0]
    l = []
    while number > 0:
        l.append(number % base)
        number = number // base
    return l

Angular - ng: command not found

The error may occur if the NodeJs is installed incorrectly or not installed at all. The proper way to fix that is to install/reinstall it the right way (check their official website for that), but if you're searching for a quick solution, you can try to install Angular CLI globally:

npm install -g @angular/cli

If it doesn't work and you are in a hurry, use sudo:

sudo npm install -g @angular/cli

Don't forget to reopen your terminal window.

Pass user defined environment variable to tomcat

For Unix & Mac systems, Go to /bin/setenv.sh inside tomcat folder

Add the below line

export JAVA_OPTS="$JAVA_OPTS -DAPP_MASTER_PASSWORD=mypass"

Now System.getProperty("APP_MASTER_PASSWORD") will return "mypass"

make a header full screen (width) css

The best way to make the header full screen is set height to be 100vh

#header{
height: 100vh;
}

Iterate over elements of List and Map using JSTL <c:forEach> tag

try this

<c:forEach items="${list}" var="map">
    <tr>
        <c:forEach items="${map}" var="entry">

            <td>${entry.value}</td>

        </c:forEach>
    </tr>
</c:forEach>

ThreadStart with parameters

Thread thread = new Thread(Work);
thread.Start(Parameter);

private void Work(object param)
{
    string Parameter = (string)param;
}

The parameter type must be an object.

EDIT:

While this answer isn't incorrect I do recommend against this approach. Using a lambda expression is much easier to read and doesn't require type casting. See here: https://stackoverflow.com/a/1195915/52551

MYSQL order by both Ascending and Descending sorting

I don't understand what the meaning of ordering with the same column ASC and DESC in the same ORDER BY, but this how you can do it: naam DESC, naam ASC like so:

ORDER BY `product_category_id` DESC,`naam` DESC, `naam` ASC

Check if a key is down?

Is there a way to detect if a key is currently down in JavaScript?

Nope. The only possibility is monitoring each keyup and keydown and remembering.

after some period of time the key begins to repeat, firing off keydown and keyup events like a fiend.

It shouldn't. You'll definitely get keypress repeating, and in many browsers you'll also get repeated keydown, but if keyup repeats, it's a bug.

Unfortunately it is not a completely unheard-of bug: on Linux, Chromium, and Firefox (when it is being run under GTK+, which it is in popular distros such as Ubuntu) both generate repeating keyup-keypress-keydown sequences for held keys, which are impossible to distinguish from someone hammering the key really fast.

Sorting hashmap based on keys

Use a TreeMap with a custom comparator.

class MyComparator implements Comparator<String>
    {
        public int compare(String o1,String o2)
        {
            // Your logic for comparing the key strings
        }
    }

TreeMap<String, Float> tm = new TreeMap<String , Float>(new MyComparator());

As you add new elements, they will be automatically sorted.

In your case, it might not even be necessary to implement a comparator because String ordering might be sufficient. But if you want to implement special cases, like lower case alphas appear before upper case, or treat the numbers a certain way, use the comparator.

private constructor

One common use is in the singleton pattern where you want only one instance of the class to exist. In that case, you can provide a static method which does the instantiation of the object. This way the number of objects instantiated of a particular class can be controlled.

How to identify which columns are not "NA" per row in a matrix?

Try:

which( !is.na(p), arr.ind=TRUE)

Which I think is just as informative and probably more useful than the output you specified, But if you really wanted the list version, then this could be used:

> apply(p, 1, function(x) which(!is.na(x)) )
[[1]]
[1] 2 3

[[2]]
[1] 4 7

[[3]]
integer(0)

[[4]]
[1] 5

[[5]]
integer(0)

Or even with smushing together with paste:

lapply(apply(p, 1, function(x) which(!is.na(x)) ) , paste, collapse=", ")

The output from which function the suggested method delivers the row and column of non-zero (TRUE) locations of logical tests:

> which( !is.na(p), arr.ind=TRUE)
     row col
[1,]   1   2
[2,]   1   3
[3,]   2   4
[4,]   4   5
[5,]   2   7

Without the arr.ind parameter set to non-default TRUE, you only get the "vector location" determined using the column major ordering the R has as its convention. R-matrices are just "folded vectors".

> which( !is.na(p) )
[1]  6 11 17 24 32

What does "|=" mean? (pipe equal operator)

It's a shortening for this:

notification.defaults = notification.defaults | Notification.DEFAULT_SOUND;

And | is a bit-wise OR.

Android Error [Attempt to invoke virtual method 'void android.app.ActionBar' on a null object reference]

I think what you want to do is cast getActivity(). For example:

((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);

This is what you need to do with the new support libraries. AppCompatActivity has replaced ActionBarActivity.

How to create an integer array in Python?

>>> a = [0] * 10
>>> a
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Attribute Error: 'list' object has no attribute 'split'

I think you've actually got a wider confusion here.

The initial error is that you're trying to call split on the whole list of lines, and you can't split a list of strings, only a string. So, you need to split each line, not the whole thing.

And then you're doing for points in Type, and expecting each such points to give you a new x and y. But that isn't going to happen. Types is just two values, x and y, so first points will be x, and then points will be y, and then you'll be done. So, again, you need to loop over each line and get the x and y values from each line, not loop over a single Types from a single line.

So, everything has to go inside a loop over every line in the file, and do the split into x and y once for each line. Like this:

def getQuakeData():
    filename = input("Please enter the quake file: ")
    readfile = open(filename, "r")

    for line in readfile:
        Type = line.split(",")
        x = Type[1]
        y = Type[2]
        print(x,y)

getQuakeData()

As a side note, you really should close the file, ideally with a with statement, but I'll get to that at the end.

Interestingly, the problem here isn't that you're being too much of a newbie, but that you're trying to solve the problem in the same abstract way an expert would, and just don't know the details yet. This is completely doable; you just have to be explicit about mapping the functionality, rather than just doing it implicitly. Something like this:

def getQuakeData():
    filename = input("Please enter the quake file: ")
    readfile = open(filename, "r")
    readlines = readfile.readlines()
    Types = [line.split(",") for line in readlines]
    xs = [Type[1] for Type in Types]
    ys = [Type[2] for Type in Types]
    for x, y in zip(xs, ys):
        print(x,y)

getQuakeData()

Or, a better way to write that might be:

def getQuakeData():
    filename = input("Please enter the quake file: ")
    # Use with to make sure the file gets closed
    with open(filename, "r") as readfile:
        # no need for readlines; the file is already an iterable of lines
        # also, using generator expressions means no extra copies
        types = (line.split(",") for line in readfile)
        # iterate tuples, instead of two separate iterables, so no need for zip
        xys = ((type[1], type[2]) for type in types)
        for x, y in xys:
            print(x,y)

getQuakeData()

Finally, you may want to take a look at NumPy and Pandas, libraries which do give you a way to implicitly map functionality over a whole array or frame of data almost the same way you were trying to.

TypeError: Can't convert 'int' object to str implicitly

def attributeSelection():
balance = 25
print("Your SP balance is currently 25.")
strength = input("How much SP do you want to put into strength?")
balanceAfterStrength = balance - int(strength)
if balanceAfterStrength == 0:
    print("Your SP balance is now 0.")
    attributeConfirmation()
elif strength < 0:
    print("That is an invalid input. Restarting attribute selection. Keep an eye on your balance this time!")
    attributeSelection()
elif strength > balance:
    print("That is an invalid input. Restarting attribute selection. Keep an eye on your balance this time!")
    attributeSelection()
elif balanceAfterStrength > 0 and balanceAfterStrength < 26:
    print("Ok. You're balance is now at " + str(balanceAfterStrength) + " skill points.")
else:
    print("That is an invalid input. Restarting attribute selection.")
    attributeSelection()

Maven Java EE Configuration Marker with Java Server Faces 1.2

The below steps should be the simple fix to your problem

Project->Properties->ProjectFacet-->Uncheck jsf apply and OK.

Project->Maven->UpdateProject-->This will solve the issue.

Here while on Updating Project Maven will automatically chooses the Dynamic web module

SQL Server Insert if not exists

instead of below Code

BEGIN
   INSERT INTO EmailsRecebidos (De, Assunto, Data)
   VALUES (@_DE, @_ASSUNTO, @_DATA)
   WHERE NOT EXISTS ( SELECT * FROM EmailsRecebidos 
                   WHERE De = @_DE
                   AND Assunto = @_ASSUNTO
                   AND Data = @_DATA);
END

replace with

BEGIN
   IF NOT EXISTS (SELECT * FROM EmailsRecebidos 
                   WHERE De = @_DE
                   AND Assunto = @_ASSUNTO
                   AND Data = @_DATA)
   BEGIN
       INSERT INTO EmailsRecebidos (De, Assunto, Data)
       VALUES (@_DE, @_ASSUNTO, @_DATA)
   END
END

Updated : (thanks to @Marc Durdin for pointing)

Note that under high load, this will still sometimes fail, because a second connection can pass the IF NOT EXISTS test before the first connection executes the INSERT, i.e. a race condition. See stackoverflow.com/a/3791506/1836776 for a good answer on why even wrapping in a transaction doesn't solve this.

CORS: credentials mode is 'include'

The issue stems from your Angular code:

When withCredentials is set to true, it is trying to send credentials or cookies along with the request. As that means another origin is potentially trying to do authenticated requests, the wildcard ("*") is not permitted as the "Access-Control-Allow-Origin" header.

You would have to explicitly respond with the origin that made the request in the "Access-Control-Allow-Origin" header to make this work.

I would recommend to explicitly whitelist the origins that you want to allow to make authenticated requests, because simply responding with the origin from the request means that any given website can make authenticated calls to your backend if the user happens to have a valid session.

I explain this stuff in this article I wrote a while back.

So you can either set withCredentials to false or implement an origin whitelist and respond to CORS requests with a valid origin whenever credentials are involved

How to redirect to another page using PHP

You could use ob_start(); before you send any output. This will tell to PHP to keep all the output in a buffer until the script execution ends, so you still can change the header.

Usually I don't use output buffering, for simple projects I keep all the logic on the first part of my script, then I output all HTML.

Using getline() with file input in C++

getline, as it name states, read a whole line, or at least till a delimiter that can be specified.

So the answer is "no", getlinedoes not match your need.

But you can do something like:

inFile >> first_name >> last_name >> age;
name = first_name + " " + last_name;

How to git-svn clone the last n revisions from a Subversion repository?

... 7 years later, in the desert, a tumbleweed blows by ...

I wasn't satisfied with the accepted answer so I created some scripts to do this for you available on Github. These should help anyone who wants to use git svn clone but doesn't want to clone the entire repository and doesn't want to hunt for a specific revision to clone from in the middle of the history (maybe you're cloning a bunch of repos). Here we can just clone the last N revisions:

Use git svn clone to clone the last 50 revisions

# -u    The SVN URL to clone
# -l    The limit of revisions
# -o    The output directory

./git-svn-cloneback.sh -u https://server/project/trunk -l 50 -o myproj --authors-file=svn-authors.txt

Find the previous N revision from an SVN repo

# -u    The SVN URL to clone
# -l    The limit of revisions

./svn-lookback.sh -u https://server/project/trunk -l 5

How to Select a substring in Oracle SQL up to a specific character?

Remember this if all your Strings in the column do not have an underscore (...or else if null value will be the output):

SELECT COALESCE
(SUBSTR("STRING_COLUMN" , 0, INSTR("STRING_COLUMN", '_')-1), 
"STRING_COLUMN") 
AS OUTPUT FROM DUAL

What is an OS kernel ? How does it differ from an operating system?

It seems that the original metaphor that got us the word "kernel" for this in the first place has been forgotten. The metaphor is that an operating system is a seed. The "kernel" of the seed is the core of the operating system, providing operating system services to applications programs, which is surrounded by the "shell" of the seed that is what users see from the outside.

Some people want to tie "kernel" (and, indeed, "shell") down to be more specific than that. But in truth there's a lot of variation across operating systems. Not the least these variations is what constitutes a "shell" (which can range from Solaris' sh through Netware's Console Command Interpreter to OS/2's Workplace Shell and Windows NT's Explorer), but there's also a lot of variance from one operating system to another in what is, and isn't, a part of a "kernel" (which may or may not include disk I/O, for example).

It's best to remember that these terms are metaphors.

/* Sticky footer styles_x000D_
-------------------------------------------------- */_x000D_
html {_x000D_
  position: relative;_x000D_
  min-height: 100%;_x000D_
}_x000D_
body {_x000D_
  /* Margin bottom by footer height */_x000D_
  margin-bottom: 60px;_x000D_
}_x000D_
.footer {_x000D_
  position: absolute;_x000D_
  bottom: 0;_x000D_
  width: 100%;_x000D_
  /* Set the fixed height of the footer here */_x000D_
  height: 60px;_x000D_
  line-height: 60px; /* Vertically center the text there */_x000D_
  background-color: #f5f5f5;_x000D_
}_x000D_
_x000D_
_x000D_
/* Custom page CSS_x000D_
-------------------------------------------------- */_x000D_
/* Not required for template or sticky footer method. */_x000D_
_x000D_
body > .container {_x000D_
  padding: 60px 15px 0;_x000D_
}_x000D_
_x000D_
.footer > .container {_x000D_
  padding-right: 15px;_x000D_
  padding-left: 15px;_x000D_
}_x000D_
_x000D_
code {_x000D_
  font-size: 80%;_x000D_
}

_x000D_

SQL Server r2 installation error .. update Visual Studio 2008 to SP1

I used the Visual Studio 2008 Uninstall tool and it worked fine for me.

You can use this tool to uninstall Visual Studio 2008 official release and Visual Studio 2008 Release candidate (Only English version).

Found here, on the MSDN Forum: MSDN forum topic.

I found this answer here

Be sure you run the tool with admin-rights.

How to make popup look at the centre of the screen?

If the effect you want is to center in the center of the screen no matter where you've scrolled to, it's even simpler than that:

In your CSS use (for example)

div.centered{
  width: 100px;
  height: 50px;
  position:fixed; 
  top: calc(50% - 25px); // half of width
  left: calc(50% - 50px); // half of height
}

No JS required.

What does "O(1) access time" mean?

It means that access time is constant. Whether you're accessing from 100 or 100,000 records, the retrieval time will be the same.

In contrast, O(n) access time would indicate that the retrieval time is directly proportional to the number of records you're accessing from.

jQuery ui datepicker with Angularjs

I have almost exactly the same code as you and mine works.

Do you have jQueryUI.js included in the page?

There's a fiddle here

<input type="text" ng-model="date" jqdatepicker />
<br/>
{{ date }}


var datePicker = angular.module('app', []);

datePicker.directive('jqdatepicker', function () {
    return {
        restrict: 'A',
        require: 'ngModel',
         link: function (scope, element, attrs, ngModelCtrl) {
            element.datepicker({
                dateFormat: 'DD, d  MM, yy',
                onSelect: function (date) {
                    scope.date = date;
                    scope.$apply();
                }
            });
        }
    };
});

You'll also need the ng-app="app" somewhere in your HTML

Error message "Unable to install or run the application. The application requires stdole Version 7.0.3300.0 in the GAC"

Well, you can't install to the GAC using ClickOnce. This is documented in this MSDN article.

Add empty columns to a dataframe with specified names from a vector

set.seed(1)
example <- data.frame(col1 = rnorm(10, 0, 1), col2 = rnorm(10, 2, 3))
namevector <- c("col3", "col4")
example[ , namevector] <- NA

example
#          col1       col2 col3 col4
# 1  -0.6264538  6.5353435   NA   NA
# 2   0.1836433  3.1695297   NA   NA
# 3  -0.8356286  0.1362783   NA   NA
# 4   1.5952808 -4.6440997   NA   NA
# 5   0.3295078  5.3747928   NA   NA
# 6  -0.8204684  1.8651992   NA   NA
# 7   0.4874291  1.9514292   NA   NA
# 8   0.7383247  4.8315086   NA   NA
# 9   0.5757814  4.4636636   NA   NA
# 10 -0.3053884  3.7817040   NA   NA

PHP cURL GET request and request's body

The accepted answer is wrong. GET requests can indeed contain a body. This is the solution implemented by WordPress, as an example:

curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, 'GET' );
curl_setopt( $ch, CURLOPT_POSTFIELDS, $body );

EDIT: To clarify, the initial curl_setopt is necessary in this instance, because libcurl will default the HTTP method to POST when using CURLOPT_POSTFIELDS (see documentation).

Windows Scipy Install: No Lapack/Blas Resources Found

My 5 cents; You can just install the entire (pre-compiled) SciPy from https://github.com/scipy/scipy/releases

Good Luck!

How to calculate time difference in java?

Besides the most common approach with Period and Duration objects you can widen your knowledge with another way for dealing with time in Java.

Advanced Java 8 libraries. ChronoUnit for Differences.

ChronoUnit is a great way to determine how far apart two Temporal values are. Temporal includes LocalDate, LocalTime and so on.

LocalTime one = LocalTime.of(5,15);
LocalTime two = LocalTime.of(6,30);
LocalDate date = LocalDate.of(2019, 1, 29);

System.out.println(ChronoUnit.HOURS.between(one, two)); //1
System.out.println(ChronoUnit.MINUTES.between(one, two)); //75
System.out.println(ChronoUnit.MINUTES.between(one, date)); //DateTimeException

First example shows that between truncates rather than rounds.

The second shows how easy it is to count different units.

And the last example reminds us that we should not mess up with dates and times in Java :)

How to make full screen background in a web page

I have followed this tutorial: https://css-tricks.com/perfect-full-page-background-image/

Specifically, the first Demo was the one that helped me out a lot!

CSS
 {
    background: url(images/bg.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover; 
}

this might help!

Remove ':hover' CSS behavior from element

I also had this problem, my solution was to have an element above the element i dont want a hover effect on:

_x000D_

.no-hover {_x000D_
  position: relative;_x000D_
  opacity: 0.65 !important;_x000D_
  display: inline-block;_x000D_
}_x000D_
_x000D_
.no-hover::before {_x000D_
  content: '';_x000D_
  background-color: transparent;_x000D_
  position: absolute;_x000D_
  top: 0;_x000D_
  left: 0;_x000D_
  width: 100%;_x000D_
  height: 100%;_x000D_
  z-index: 60;_x000D_
}

_x000D_

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" />_x000D_
_x000D_
<button class="btn btn-primary">hover</button>_x000D_
<span class="no-hover">_x000D_
  <button class="btn btn-primary ">no hover</button>_x000D_
</span>

_x000D_

How to change language of app when user selects language?

You should either remove android:configChanges="locale" from manifest, which will cause activity to reload, or override onConfigurationChanged method:

@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
    // your code here, you can use newConfig.locale if you need to check the language
    // or just re-set all the labels to desired string resource
}

How to draw an overlay on a SurfaceView used by Camera on Android?

Try calling setWillNotDraw(false) from surfaceCreated:

public void surfaceCreated(SurfaceHolder holder) {
    try {
        setWillNotDraw(false); 
        mycam.setPreviewDisplay(holder);
        mycam.startPreview();
    } catch (Exception e) {
        e.printStackTrace();
        Log.d(TAG,"Surface not created");
    }
}

@Override
protected void onDraw(Canvas canvas) {

    canvas.drawRect(area, rectanglePaint);
    Log.w(this.getClass().getName(), "On Draw Called");
}

and calling invalidate from onTouchEvent:

public boolean onTouch(View v, MotionEvent event) {

    invalidate();
    return true;
}

CSS Background Image Not Displaying

Its always good to have these additional properties besides the

background-image:url('path') no-repeat 0 0;

set dimension to the element

width:x; height:y;
background-size:100%
- This property helps to fit the image to the above dimension that you define for an element.

jQuery datepicker, onSelect won't work

No comma after the last property.

Semicolon after alert(date);

Case on datepicker (not datePicker)

Check your other uppercase / lowercase for the properties.

$(function() {
    $('.date-pick').datepicker( {
        onSelect: function(date) {
            alert(date);
        },
        selectWeek: true,
        inline: true,
        startDate: '01/01/2000',
        firstDay: 1
    });
});

How to make a parent div auto size to the width of its children divs

The parent div (I assume the outermost div) is display: block and will fill up all available area of its container (in this case, the body) that it can. Use a different display type -- inline-block is probably what you are going for:

http://jsfiddle.net/a78xy/

Python's time.clock() vs. time.time() accuracy?

Short answer: use time.clock() for timing in Python.

On *nix systems, clock() returns the processor time as a floating point number, expressed in seconds. On Windows, it returns the seconds elapsed since the first call to this function, as a floating point number.

time() returns the the seconds since the epoch, in UTC, as a floating point number. There is no guarantee that you will get a better precision that 1 second (even though time() returns a floating point number). Also note that if the system clock has been set back between two calls to this function, the second function call will return a lower value.

Understanding the ngRepeat 'track by' expression

a short summary:

track by is used in order to link your data with the DOM generation (and mainly re-generation) made by ng-repeat.

when you add track by you basically tell angular to generate a single DOM element per data object in the given collection

this could be useful when paging and filtering, or any case where objects are added or removed from ng-repeat list.

usually, without track by angular will link the DOM objects with the collection by injecting an expando property - $$hashKey - into your JavaScript objects, and will regenerate it (and re-associate a DOM object) with every change.

full explanation:

http://www.bennadel.com/blog/2556-using-track-by-with-ngrepeat-in-angularjs-1-2.htm

a more practical guide:

http://www.codelord.net/2014/04/15/improving-ng-repeat-performance-with-track-by/

(track by is available in angular > 1.2 )

Printing tuple with string formatting in Python

You can try this one as well;

tup = (1,2,3)
print("this is a tuple {something}".format(something=tup))

You can't use %something with (tup) just because of packing and unpacking concept with tuple.

Scala check if element is present in a list

this should work also with different predicate

myFunction(strings.find( _ == mystring ).isDefined)

Integer value in TextView

String s = Integer.toString(10);

Then setText(s)

Can't choose class as main class in IntelliJ

The documentation you linked actually has the answer in the link associated with the "Java class located out of the source root." Configure your source and test roots and it should work.

https://www.jetbrains.com/idea/webhelp/configuring-content-roots.html

Since you stated that these are tests you should probably go with them marked as Test Source Root instead of Source Root.

jQuery, simple polling example

function doPoll(){
    $.post('ajax/test.html', function(data) {
        alert(data);  // process results here
        setTimeout(doPoll,5000);
    });
}

How to disable Excel's automatic cell reference change after copy/paste?

I found another workaround that is very simple: 1. Cut the contents 2. Paste them in the new location 3. Copy the contents that you just pasted into the new location you want. 4. Undo the Cut-Paste operation, putting the original contents back where you got them. 5. Paste the contents from the clipboard to the same location. These contents will have the original references.

It looks like a lot, but is super fast with keyboard shortcuts: 1. Ctrl-x, 2. Ctrl-v, 3. Ctrl-c, 4. Ctrl-z, 5. Ctrl-v

Cmake is not able to find Python-libraries

For me was helpful next:

> apt-get install python-dev python3-dev

How do I update the GUI from another thread?

In my case (WPF) the solution is simple as this:

private void updateUI()
{
    if (!Dispatcher.CheckAccess())
    {
        Dispatcher.BeginInvoke(updateUI);
        return;
    }

    // Update any number of controls here
}

deleting folder from java

If you use Apache Commons IO it's a one-liner:

FileUtils.deleteDirectory(dir);

See FileUtils.deleteDirectory()

~~Guava used to support similar functionality:~~

~~Files.deleteRecursively(dir);~~

This has been removed from Guava several releases ago.

While the above version is very simple, it is also pretty dangerous, as it makes a lot of assumptions without telling you. So while it may be safe in most cases, I prefer the "official way" to do it (since Java 7):

public static void deleteFileOrFolder(final Path path) throws IOException {
  Files.walkFileTree(path, new SimpleFileVisitor<Path>(){
    @Override public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs)
      throws IOException {
      Files.delete(file);
      return CONTINUE;
    }

    @Override public FileVisitResult visitFileFailed(final Path file, final IOException e) {
      return handleException(e);
    }

    private FileVisitResult handleException(final IOException e) {
      e.printStackTrace(); // replace with more robust error handling
      return TERMINATE;
    }

    @Override public FileVisitResult postVisitDirectory(final Path dir, final IOException e)
      throws IOException {
      if(e!=null)return handleException(e);
      Files.delete(dir);
      return CONTINUE;
    }
  });
};

Best Way to View Generated Source of Webpage?

In the elements tab, right click the html node > copy > copy element - then paste into an editor.

As has been mentioned above, once the source has been converted into a DOM tree, the original source no longer exists in the browser. Any changes you make will be to the DOM, not the source.

However, you can parse the modified DOM back into HTML, letting you see the "generated source".

In Chrome, open the developer tools and click the elements tab.
Right click the HTML element.
Choose copy > copy element.
Paste into an editor.

You can now see the current DOM as an HTML page.

This is not the full DOM

Note that the DOM cannot be fully represented by an HTML document. This is because the DOM has many more properties than the HTML has attributes. However this will do a reasonable job.

Git merge error "commit is not possible because you have unmerged files"

You can use git stash to save the current repository before doing the commit you want to make (after merging the changes from the upstream repo with git stash pop). I had to do this yesterday when I had the same problem.

Tensorflow import error: No module named 'tensorflow'

I think your tensorflow is not installed for local environment.The best way of installing tensorflow is to create virtualenv as describe in the tensorflow installation guide Tensorflow Installation .After installing you can activate the invironment and can run anypython script under that environment.

How do I create an Excel (.XLS and .XLSX) file in C# without installing Microsoft Office?

You can use a library called ExcelLibrary. It's a free, open source library posted on Google Code:

ExcelLibrary

This looks to be a port of the PHP ExcelWriter that you mentioned above. It will not write to the new .xlsx format yet, but they are working on adding that functionality in.

It's very simple, small and easy to use. Plus it has a DataSetHelper that lets you use DataSets and DataTables to easily work with Excel data.

ExcelLibrary seems to still only work for the older Excel format (.xls files), but may be adding support in the future for newer 2007/2010 formats.

You can also use EPPlus, which works only for Excel 2007/2010 format files (.xlsx files). There's also NPOI which works with both.

There are a few known bugs with each library as noted in the comments. In all, EPPlus seems to be the best choice as time goes on. It seems to be more actively updated and documented as well.

Also, as noted by @????????????? below, EPPlus has support for Pivot Tables and ExcelLibrary may have some support (Pivot table issue in ExcelLibrary)

Here are a couple links for quick reference:
ExcelLibrary - GNU Lesser GPL
EPPlus - GNU (LGPL) - No longer maintained
EPPlus 5 - Polyform Noncommercial - Starting May 2020
NPOI - Apache License

Here some example code for ExcelLibrary:

Here is an example taking data from a database and creating a workbook from it. Note that the ExcelLibrary code is the single line at the bottom:

//Create the data set and table
DataSet ds = new DataSet("New_DataSet");
DataTable dt = new DataTable("New_DataTable");

//Set the locale for each
ds.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;
dt.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;

//Open a DB connection (in this example with OleDB)
OleDbConnection con = new OleDbConnection(dbConnectionString);
con.Open();

//Create a query and fill the data table with the data from the DB
string sql = "SELECT Whatever FROM MyDBTable;";
OleDbCommand cmd = new OleDbCommand(sql, con);
OleDbDataAdapter adptr = new OleDbDataAdapter();

adptr.SelectCommand = cmd;
adptr.Fill(dt);
con.Close();

//Add the table to the data set
ds.Tables.Add(dt);

//Here's the easy part. Create the Excel worksheet from the data set
ExcelLibrary.DataSetHelper.CreateWorkbook("MyExcelFile.xls", ds);

Creating the Excel file is as easy as that. You can also manually create Excel files, but the above functionality is what really impressed me.

How to get correlation of two vectors in python

The docs indicate that numpy.correlate is not what you are looking for:

numpy.correlate(a, v, mode='valid', old_behavior=False)[source]
  Cross-correlation of two 1-dimensional sequences.
  This function computes the correlation as generally defined in signal processing texts:
     z[k] = sum_n a[n] * conj(v[n+k])
  with a and v sequences being zero-padded where necessary and conj being the conjugate.

Instead, as the other comments suggested, you are looking for a Pearson correlation coefficient. To do this with scipy try:

from scipy.stats.stats import pearsonr   
a = [1,4,6]
b = [1,2,3]   
print pearsonr(a,b)

This gives

(0.99339926779878274, 0.073186395040328034)

You can also use numpy.corrcoef:

import numpy
print numpy.corrcoef(a,b)

This gives:

[[ 1.          0.99339927]
 [ 0.99339927  1.        ]]

How to enter a formula into a cell using VBA?

You aren't building your formula right.

Worksheets("EmployeeCosts").Range("B" & var1a).Formula =  "=SUM(H5:H" & var1a & ")"

This does the same as the following lines do:

Dim myFormula As String
myFormula = "=SUM(H5:H"
myFormula = myFormula & var1a
myformula = myformula & ")"

which is what you are trying to do.

Also, you want to have the = at the beginning of the formala.

Can anyone confirm that phpMyAdmin AllowNoPassword works with MySQL databases?

It works; just thought this would be helpful to someone in the future.

If you are working with MAMP, as a security measure, the $cfg['Servers'][$i]['AllowNoPassword'] = true; usually will be missing in the config.inc.php file so if you want to use phpMyAdmin without a password for root then simply add it preferably after the $cfg['Servers'][$i]['AllowDeny']['rules'] = array(); statement.

Then Restart your server just to be sure and you will be good to go.

What does the "~" (tilde/squiggle/twiddle) CSS selector mean?

Good to also check the other combinators in the family and to get back to what is this specific one.

ul li
ul > li
ul + ul
ul ~ ul

Example checklist:

ul li - Looking inside - Selects all the li elements placed (anywhere) inside the ul; Descendant selector
ul > li - Looking inside - Selects only the direct li elements of ul; i.e. it will only select direct children li of ul; Child Selector or Child combinator selector
ul + ul - Looking outside - Selects the ul immediately following the ul; It is not looking inside, but looking outside for the immediately following element; Adjacent Sibling Selector
ul ~ ul - Looking outside - Selects all the ul which follows the ul doesn't matter where it is, but both ul should be having the same parent; General Sibling Selector

The one we are looking at here is General Sibling Selector

Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths - why?

The simple way is to, Edit your migration file (cascadeDelete: true) into (cascadeDelete: false) then after assign the Update-Database command in your Package Manager Console.if it's problem with your last migration then all right. Otherwise check your earlier migration history, copy those things, paste into your last migration file, after that do it the same thing. it perfectly works for me.

SQL - IF EXISTS UPDATE ELSE INSERT INTO

Create a UNIQUE constraint on your subs_email column, if one does not already exist:
```
ALTER TABLE subs ADD UNIQUE (subs_email)
```

Use INSERT ... ON DUPLICATE KEY UPDATE:

INSERT INTO subs
  (subs_name, subs_email, subs_birthday)
VALUES
  (?, ?, ?)
ON DUPLICATE KEY UPDATE
  subs_name     = VALUES(subs_name),
  subs_birthday = VALUES(subs_birthday)

You can use the VALUES(col_name) function in the UPDATE clause to refer to column values from the INSERT portion of the INSERT ... ON DUPLICATE KEY UPDATE - dev.mysql.com

Note that I have used parameter placeholders in the place of string literals, as one really should be using parameterised statements to defend against SQL injection attacks.

Can I redirect the stdout in python into some sort of string buffer?

There is contextlib.redirect_stdout() function in Python 3.4:

import io
from contextlib import redirect_stdout

with io.StringIO() as buf, redirect_stdout(buf):
    print('redirected')
    output = buf.getvalue()

Here's code example that shows how to implement it on older Python versions.

How to convert milliseconds into a readable date?

This is a solution. Later you can split by ":" and take the values of the array

 /**
 * Converts milliseconds to human readeable language separated by ":"
 * Example: 190980000 --> 2:05:3 --> 2days 5hours 3min
 */
function dhm(t){
    var cd = 24 * 60 * 60 * 1000,
        ch = 60 * 60 * 1000,
        d = Math.floor(t / cd),
        h = '0' + Math.floor( (t - d * cd) / ch),
        m = '0' + Math.round( (t - d * cd - h * ch) / 60000);
    return [d, h.substr(-2), m.substr(-2)].join(':');
}

//Example
var delay = 190980000;                   
var fullTime = dhm(delay);
console.log(fullTime);

Rails: How to reference images in CSS within Rails 4

In css

background: url("/assets/banner.jpg");

although the original path is /assets/images/banner.jpg, by convention you have to add just /assets/ in the url method

Using an attribute of the current class instance as a default value for method's parameter

There is much more to it than you think. Consider the defaults to be static (=constant reference pointing to one object) and stored somewhere in the definition; evaluated at method definition time; as part of the class, not the instance. As they are constant, they cannot depend on self.

Here is an example. It is counterintuitive, but actually makes perfect sense:

def add(item, s=[]):
    s.append(item)
    print len(s)

add(1)     # 1
add(1)     # 2
add(1, []) # 1
add(1, []) # 1
add(1)     # 3

This will print 1 2 1 1 3.

Because it works the same way as

default_s=[]
def add(item, s=default_s):
    s.append(item)

Obviously, if you modify default_s, it retains these modifications.

There are various workarounds, including

def add(item, s=None):
    if not s: s = []
    s.append(item)

or you could do this:

def add(self, item, s=None):
    if not s: s = self.makeDefaultS()
    s.append(item)

Then the method makeDefaultS will have access to self.

Another variation:

import types
def add(item, s=lambda self:[]):
    if isinstance(s, types.FunctionType): s = s("example")
    s.append(item)

here the default value of s is a factory function.

You can combine all these techniques:

class Foo:
    import types
    def add(self, item, s=Foo.defaultFactory):
        if isinstance(s, types.FunctionType): s = s(self)
        s.append(item)

    def defaultFactory(self):
        """ Can be overridden in a subclass, too!"""
        return []

Apply pandas function to column to create multiple new columns?

you can return the entire row instead of values:

df = df.apply(extract_text_features,axis = 1)

where the function returns the row

def extract_text_features(row):
      row['new_col1'] = value1
      row['new_col2'] = value2
      return row

Check, using jQuery, if an element is 'display:none' or block on click

Use this condition:

if (jQuery(".profile-page-cont").css('display') == 'block'){
    // Condition 
}

Change value of variable with dplyr

We can use replace to change the values in 'mpg' to NA that corresponds to cyl==4.

mtcars %>%
     mutate(mpg=replace(mpg, cyl==4, NA)) %>%
     as.data.frame()

How to replace (null) values with 0 output in PIVOT

If you have a situation where you are using dynamic columns in your pivot statement you could use the following:

DECLARE @cols               NVARCHAR(MAX)
DECLARE @colsWithNoNulls    NVARCHAR(MAX)
DECLARE @query              NVARCHAR(MAX)

SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(Name) 
            FROM Hospital
            WHERE Active = 1 AND StateId IS NOT NULL
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

SET @colsWithNoNulls = STUFF(
            (
                SELECT distinct ',ISNULL(' + QUOTENAME(Name) + ', ''No'') ' + QUOTENAME(Name)
                FROM Hospital
                WHERE Active = 1 AND StateId IS NOT NULL
                FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

EXEC ('
        SELECT Clinician, ' + @colsWithNoNulls + '
        FROM
        (
            SELECT DISTINCT p.FullName AS Clinician, h.Name, CASE WHEN phl.personhospitalloginid IS NOT NULL THEN ''Yes'' ELSE ''No'' END AS HasLogin
            FROM Person p
            INNER JOIN personlicense pl ON pl.personid = p.personid
            INNER JOIN LicenseType lt on lt.licensetypeid = pl.licensetypeid
            INNER JOIN licensetypegroup ltg ON ltg.licensetypegroupid = lt.licensetypegroupid
            INNER JOIN Hospital h ON h.StateId = pl.StateId
            LEFT JOIN PersonHospitalLogin phl ON phl.personid = p.personid AND phl.HospitalId = h.hospitalid
            WHERE ltg.Name = ''RN'' AND
                pl.licenseactivestatusid = 2 AND
                h.Active = 1 AND
                h.StateId IS NOT NULL
        ) AS Results
        PIVOT
        (
            MAX(HasLogin)
            FOR Name IN (' + @cols + ')
        ) p
')

How to make a .jar out from an Android Studio project

the way i found was to find the project compiler output (project structure > project). then find the complied folder of the module you wish to turn to a jar, compress it with zip and change the extension of the output from zip to jar.

How to set a CheckBox by default Checked in ASP.Net MVC

Old question, but another "pure razor" answer would be:

@Html.CheckBoxFor(model => model.As, htmlAttributes: new { @checked = true} )

How to drop a database with Mongoose?

beforeEach((done) => {
      mongoose.connection.dropCollection('products',(error ,result) => {
      if (error) {
        console.log('Products Collection is not dropped')
      } else {
        console.log(result)
      }
    done()
    })
  })

Jquery click event not working after append method

The .on() method is used to delegate events to elements, dynamically added or already present in the DOM:

_x000D_

// STATIC-PARENT              on  EVENT    DYNAMIC-CHILD_x000D_
$('#registered_participants').on('click', '.new_participant_form', function() {_x000D_
_x000D_
  var $td = $(this).closest('tr').find('td');_x000D_
  var part_name = $td.eq(1).text();_x000D_
  console.log( part_name );_x000D_
_x000D_
});_x000D_
_x000D_
_x000D_
$('#add_new_participant').click(function() {_x000D_
_x000D_
  var first_name = $.trim( $('#f_name_participant').val() );_x000D_
  var last_name  = $.trim( $('#l_name_participant').val() );_x000D_
  var role       = $('#new_participant_role').val();_x000D_
  var email      = $('#email_participant').val();_x000D_
  _x000D_
  if(!first_name && !last_name) return;_x000D_
_x000D_
  $('#registered_participants').append('<tr><td><a href="#" class="new_participant_form">Participant Registration</a></td><td>' + first_name + ' ' + last_name + '</td><td>' + role + '</td><td>0% done</td></tr>');_x000D_
_x000D_
});

_x000D_

<table id="registered_participants" class="tablesorter">_x000D_
  <thead>_x000D_
    <tr>_x000D_
      <th>Form</th>_x000D_
      <th>Name</th>_x000D_
      <th>Role</th>_x000D_
      <th>Progress </th>_x000D_
    </tr>_x000D_
  </thead>_x000D_
  <tbody>_x000D_
    <tr>_x000D_
      <td><a href="#" class="new_participant_form">Participant Registration</a></td>_x000D_
      <td>Smith Johnson</td>_x000D_
      <td>Parent</td>_x000D_
      <td>60% done</td>_x000D_
    </tr>_x000D_
  </tbody>_x000D_
</table>_x000D_
_x000D_
<input type="text" id="f_name_participant" placeholder="Name">_x000D_
<input type="text" id="l_name_participant" placeholder="Surname">_x000D_
<select id="new_participant_role">_x000D_
  <option>Parent</option>_x000D_
  <option>Child</option>_x000D_
</select>_x000D_
<button id="add_new_participant">Add New Entry</button>_x000D_
_x000D_
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

_x000D_

Exists Angularjs code/naming conventions?

If you are a beginner, it is better you first go through some basic tutorials and after that learn about naming conventions. I have gone through the following to learn Angular, some of which are very effective.

Tutorials :

Details of application structure and naming conventions can be found in a variety of places. I've gone through 100's of sites and I think these are among the best:

Find provisioning profile in Xcode 5

I wrote a simple bash script to get around this stupid problem. Pass in the path to a named copy of your provision (downloaded from developer.apple.com) and it will identify the matching GUID-renamed file in your provision library:

#!/bin/bash

if [ -z "$1" ] ; then
  echo -e "\nUsage: $0 <myprovision>\n"
  exit
fi

if [ ! -f "$1" ] ; then
  echo -e "\nFile not found: $1\n"
  exit
fi

provisionpath="$HOME/Library/MobileDevice/Provisioning Profiles"
provisions=$( ls "$provisionpath" )

for i in $provisions ; do
  match=$( diff "$1" "$provisionpath/$i" )
  if [ "$match" = "" ] ; then
    echo -e "\nmatch: $provisionpath/$i\n"
  fi
done

Different ways of loading a file as an InputStream

After trying some ways to load the file with no success, I remembered I could use FileInputStream, which worked perfectly.

InputStream is = new FileInputStream("file.txt");

This is another way to read a file into an InputStream, it reads the file from the currently running folder.

Get url without querystring

Request.RawUrl.Split('?')[0]

Just for url name only !!

Shell Script: Execute a python program from within a shell script

This works best for me: Add this at the top of the script:

#!c:/Python27/python.exe

(C:\Python27\python.exe is the path to the python.exe on my machine) Then run the script via:

chmod +x script-name.py && script-name.py

HTML Best Practices: Should I use ’ or the special keyboard shortcut?

Typographically, the correct glyph to use in sentence punctuation is the quote mark, both single (including for apostrophes) and double quotes. The straight-looking mark that we often see on the web is called a prime, which also comes in single and double varieties and has limited uses, mostly for measurements.

This article explains how to use them correctly.

Get a filtered list of files in a directory

You can use pathlib that is available in Python standard library 3.4 and above.

from pathlib import Path

files = [f for f in Path.cwd().iterdir() if f.match("145592*.jpg")]

How does cellForRowAtIndexPath work?

1) The function returns a cell for a table view yes? So, the returned object is of type UITableViewCell. These are the objects that you see in the table's rows. This function basically returns a cell, for a table view. But you might ask, how the function would know what cell to return for what row, which is answered in the 2nd question

2)NSIndexPath is essentially two things-

Your Section
Your row

Because your table might be divided to many sections and each with its own rows, this NSIndexPath will help you identify precisely which section and which row. They are both integers. If you're a beginner, I would say try with just one section.

It is called if you implement the UITableViewDataSource protocol in your view controller. A simpler way would be to add a UITableViewController class. I strongly recommend this because it Apple has some code written for you to easily implement the functions that can describe a table. Anyway, if you choose to implement this protocol yourself, you need to create a UITableViewCell object and return it for whatever row. Have a look at its class reference to understand re-usablity because the cells that are displayed in the table view are reused again and again(this is a very efficient design btw).

As for when you have two table views, look at the method. The table view is passed to it, so you should not have a problem with respect to that.

Difference between "while" loop and "do while" loop

while test the condition before executing statements in the while loop.

do while test the condition after having executed statement inside the loop.

Whoops, looks like something went wrong. Laravel 5.0

The logs are located in storage directory. If you want laravel to display the error for you rather than the cryptic 'Whoops' message, copy the .env.example to .env and make sure APP_ENV=local is in there. It should then show you the detailed error messaging.

How to iterate over a JSONObject?

for my case i found iterating the names() works well

for(int i = 0; i<jobject.names().length(); i++){
    Log.v(TAG, "key = " + jobject.names().getString(i) + " value = " + jobject.get(jobject.names().getString(i)));
}

How can I run multiple curl requests processed sequentially?

It would most likely process them sequentially (why not just test it). But you can also do this:

make a file called curlrequests.sh

put it in a file like thus:

curl http://example.com/?update_=1
curl http://example.com/?update_=3
curl http://example.com/?update_=234
curl http://example.com/?update_=65

save the file and make it executable with chmod:
```
chmod +x curlrequests.sh
```
run your file:
```
./curlrequests.sh
```

   /path/to/file/curlrequests.sh

As a side note, you can chain requests with &&, like this:

   curl http://example.com/?update_=1 && curl http://example.com/?update_=2 && curl http://example.com?update_=3`

And execute in parallel using &:

   curl http://example.com/?update_=1 & curl http://example.com/?update_=2 & curl http://example.com/?update_=3

Apache 2.4 - Request exceeded the limit of 10 internal redirects due to probable configuration error

This problem can be caused by requests for certain files that don't exist. For example, requests for files in wp-content/uploads/ where the file does not exist.

If this is the situation you're seeing, you can solve the problem by going to .htaccess and changing this line:

RewriteRule ^(wp-(content|admin|includes).*) $1 [L]

to:

RewriteRule ^(wp-(content|admin|includes).*) - [L]

The underlying issue is that the rule above triggers a rewrite to the exact same url with a slash in front and because there was a rewrite, the newly rewritten request goes back through the rules again and the same rule is triggered. By changing that line's "$1" to "-", no rewrite happens and so the rewriting process does not start over again with the same URL.

It's possible that there's a difference in how apache 2.2 and 2.4 handle this situation of only-difference-is-a-slash-in-front and that's why the default rules provided by WordPress aren't working perfectly.

How to change XML Attribute

Using LINQ to xml if you are using framework 3.5:

using System.Xml.Linq;

XDocument xmlFile = XDocument.Load("books.xml"); 

var query = from c in xmlFile.Elements("catalog").Elements("book")    
            select c; 

foreach (XElement book in query) 
{
   book.Attribute("attr1").Value = "MyNewValue";
}

xmlFile.Save("books.xml");

Relative URLs in WordPress

I solved it in my site making this in functions.php

add_action("template_redirect", "start_buffer");
add_action("shutdown", "end_buffer", 999);

function filter_buffer($buffer) {
    $buffer = replace_insecure_links($buffer);
    return $buffer;
}
function start_buffer(){
    ob_start("filter_buffer");
}

function end_buffer(){
    if (ob_get_length()) ob_end_flush();
}

function replace_insecure_links($str) {

   $str = str_replace ( array("http://www.yoursite.com/", "https://www.yoursite.com/") , array("/", "/"), $str);

   return apply_filters("rsssl_fixer_output", $str);

}

I took part of one plugin, cut it into pieces and make this. It replaced ALL links in my site (menus, css, scripts etc.) and everything was working.

Cannot create a connection to data source Error (rsErrorOpeningConnection) in SSRS

First thing I would try is to get a bit more information on the error - that's a pretty generic message.

You could enable remote errors as per the error message and replicate the error for more information:

Enable remote errors.

Or check the Report Server error logs to see what error was logged.

%programfiles%\Microsoft SQL Server\<SQL Server Instance>\Reporting Services\LogFiles\

The next step would be to connect as the Data Source user to the database, run any code/stored procedures that the report is using with the same parameters you're using when running the report, and see if any errors occur.

how to make a html iframe 100% width and height?

Answering this just in case if someone else like me stumbles upon this post among many that advise use of JavaScripts for changing iframe height to 100%.

I strongly recommend that you see and try this option specified at How do you give iframe 100% height before resorting to a JavaScript based option. The referenced solution works perfectly for me in all of the testing I have done so far. Hope this helps someone.

python requests get cookies

If you need the path and thedomain for each cookie, which get_dict() is not exposes, you can parse the cookies manually, for instance:

[
    {'name': c.name, 'value': c.value, 'domain': c.domain, 'path': c.path}
    for c in session.cookies
]

Compare two Byte Arrays? (Java)

Since I wanted to compare two arrays for a unit Test and I arrived on this answer I thought I could share.

You can also do it with:

@Test
public void testTwoArrays() {
  byte[] array = new BigInteger("1111000011110001", 2).toByteArray();
  byte[] secondArray = new BigInteger("1111000011110001", 2).toByteArray();

  Assert.assertArrayEquals(array, secondArray);
}

And you could check on Comparing arrays in JUnit assertions for more infos.

Programs & Examples On #Readystate

What do the different readystates in XMLHttpRequest mean, and how can I use them?

Test for non-zero length string in Bash: [ -n "$var" ] or [ "$var" ]

Usual cases

Rare cases

Related posts and documentation

pip or pip3 to install packages for Python 3?

window.print() not working in IE

Insert if not exists Oracle

How to calculate age (in years) based on Date of Birth and getDate()

Proper use of const for defining functions in JavaScript

Maven:Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:2.7:resources

program cant start because php5.dll is missing

Excel: replace part of cell's string value

org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'customerService' is defined

What is the right way to treat argparse.Namespace() as a dictionary?

How can I convert a zero-terminated byte array to string?

invalid types 'int[int]' for array subscript

How do you put an image file in a json object?

What does the "+" (plus sign) CSS selector mean?

Android emulator not able to access the internet

How can I capture the result of var_dump to a string?

Try var_export

Why?

Demo:

The difference in output:

var_export ($debug_export in above example):

var_dump ($debug_dump in above example):

print_r ($debug_printr in above example):

Caveat: var_export does not handle circular references

Days between two dates?

jdk7 32 bit windows version to download

How can I get the name of an html page in Javascript?

Ruby: kind_of? vs. instance_of? vs. is_a?

Is it valid to replace http:// with // in a <script src="http://...">?

How can I select the first day of a month in SQL?

Converting timestamp to time ago in PHP e.g 1 day ago, 2 days ago...

PHP foreach with Nested Array?

How to import and use image in a Vue single file component?

It is heavily suggested to make use of webpack when importing pictures from assets and in general for optimisation and pathing purposes

GSON throwing "Expected BEGIN_OBJECT but was BEGIN_ARRAY"?

How to trim a string to N chars in Javascript?

Steps to send a https request to a rest service in Node js

Resolve conflicts using remote changes when pulling from Git remote

How to validate phone numbers using regex

Proper use cases for Android UserManager.isUserAGoat()?

Android R Update:

Previous answer:

How to get the number of columns in a matrix?

CFLAGS vs CPPFLAGS

Get only specific attributes with from Laravel Collection

How can I create a text box for a note in markdown?

How do I create a timeline chart which shows multiple events? Eg. Metallica Band members timeline on wiki

Material effect on button with background color

Flutter - Wrap text on overflow, like insert ellipsis or fade

How to read and write xml files?

Can't import database through phpmyadmin file size too large

How to disable right-click context-menu in JavaScript

python object() takes no parameters error

Pointers, smart pointers or shared pointers?

How to get value of Radio Buttons?

Convert JSON to Map

Conversion failed when converting the varchar value 'simple, ' to data type int

How can I display a messagebox in ASP.NET?

check for null date in CASE statement, where have I gone wrong?

Format cell if cell contains date less than today

How do I stop Notepad++ from showing autocomplete for all words in the file

How to detect IE11?

text box input height

.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary -- Speed, memory, and when to use each?

Using classes with the Arduino

Automapper missing type map configuration or unsupported mapping - Error

How do I make a JSON object with multiple arrays?

How read Doc or Docx file in java?

Is the order of elements in a JSON list preserved?

Wrapping a react-router Link in an html button

Named tuple and default values for optional keyword arguments

How to remove a class from elements in pure JavaScript?

java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication Maven

VBA vlookup reference in different sheet

Try `var_export`

var_export (`$debug_export` in above example):

var_dump (`$debug_dump` in above example):

print_r (`$debug_printr` in above example):

Caveat: `var_export` does not handle circular references