How to submit an HTML form on loading the page?

You can try also using below script

<html>
<head>
<script>
function load()
{
document.frm1.submit()
}
</script>
</head>

<body onload="load()">
<form action="http://www.google.com" id="frm1" name="frm1">
<input type="text" value="" />
</form>
</body>
</html>

How to generate a git patch for a specific commit?

What is the way to generate a patch only for the specific SHA1?

It's quite simple:

Option 1. git show commitID > myFile.patch

Option 2. git commitID~1..commitID > myFile.patch

Note: Replace commitID with actual commit id (SHA1 commit code).

Convert HTML Character Back to Text Using Java Standard Library

I think the Apache Commons Lang library's StringEscapeUtils.unescapeHtml3() and unescapeHtml4() methods are what you are looking for. See https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/StringEscapeUtils.html.

Viewing full version tree in git

When I'm in my work place with terminal only, I use:

git log --oneline --graph --color --all --decorate
When the OS support GUI, I use:

gitk --all
When I'm in my home Windows PC, I use my own GitVersionTree

How to set iframe size dynamically

I've found this to work the best across all browsers and devices (PC, tables & mobile).

<script type="text/javascript">
                      function iframeLoaded() {
                          var iFrameID = document.getElementById('idIframe');
                          if(iFrameID) {
                                // here you can make the height, I delete it first, then I make it again
                                iFrameID.height = "";
                                iFrameID.height = iFrameID.contentWindow.document.body.scrollHeight + "px";
                          }   
                      }
                    </script> 


<iframe id="idIframe" onload="iframeLoaded()" frameborder="0" src="yourpage.php" height="100%" width="100%" scrolling="no"></iframe>

How to write to a file without overwriting current contents?

Instead of "w" use "a" (append) mode with open function:

with open("games.txt", "a") as text_file:

How to send PUT, DELETE HTTP request in HttpURLConnection?

To perform an HTTP PUT:

URL url = new URL("http://www.example.com/resource");
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setDoOutput(true);
httpCon.setRequestMethod("PUT");
OutputStreamWriter out = new OutputStreamWriter(
    httpCon.getOutputStream());
out.write("Resource content");
out.close();
httpCon.getInputStream();

To perform an HTTP DELETE:

URL url = new URL("http://www.example.com/resource");
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setDoOutput(true);
httpCon.setRequestProperty(
    "Content-Type", "application/x-www-form-urlencoded" );
httpCon.setRequestMethod("DELETE");
httpCon.connect();

My Application Could not open ServletContext resource

The file name u used spring-dispatcher-servlet.xml
kindly check in web.xml
servlet name as spring-dispatcher at both tag  <servlet> and <servlet-mapping>
in your case it should be

<servlet>
<servlet-name>spring-dispatcher</servlet-name>
<servlet-class></servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>spring-dispatcher</servlet-name>
<url-pattern></url-pattern>
</servlet-mapping>

What is a segmentation fault?

Segmentation fault is a specific kind of error caused by accessing memory that “does not belong to you.” It’s a helper mechanism that keeps you from corrupting the memory and introducing hard-to-debug memory bugs. Whenever you get a segfault you know you are doing something wrong with memory – accessing a variable that has already been freed, writing to a read-only portion of the memory, etc. Segmentation fault is essentially the same in most languages that let you mess with memory management, there is no principal difference between segfaults in C and C++.

There are many ways to get a segfault, at least in the lower-level languages such as C(++). A common way to get a segfault is to dereference a null pointer:

int *p = NULL;
*p = 1;

Another segfault happens when you try to write to a portion of memory that was marked as read-only:

char *str = "Foo"; // Compiler marks the constant string as read-only
*str = 'b'; // Which means this is illegal and results in a segfault

Dangling pointer points to a thing that does not exist anymore, like here:

char *p = NULL;
{
    char c;
    p = &c;
}
// Now p is dangling

The pointer p dangles because it points to the character variable c that ceased to exist after the block ended. And when you try to dereference dangling pointer (like *p='A'), you would probably get a segfault.

How do I make a file:// hyperlink that works in both IE and Firefox?

just use

file:///

works in IE, Firefox and Chrome as far as I can tell.

see http://msdn.microsoft.com/en-us/library/aa767731(VS.85).aspx for more info

Method call if not null in C#

Cerating extention method like one suggested does not really solve issues with race conditions, but rather hide them.

public static void SafeInvoke(this EventHandler handler, object sender)
{
    if (handler != null) handler(sender, EventArgs.Empty);
}

As stated this code is the elegant equivalent to solution with temporary variable, but...

The problem with both that it's possible that subsciber of the event could be called AFTER it has unsubscribed from the event. This is possible because unsubscription can happen after delegate instance is copied to the temp variable (or passed as parameter in the method above), but before delegate is invoked.

In general the behaviour of the client code is unpredictable in such case: component state could not allow to handle event notification already. It's possible to write client code in the way to handle it, but it would put unnecesssary responsibility to the client.

The only known way to ensure thread safity is to use lock statement for the sender of the event. This ensures that all subscriptions\unsubscriptions\invocation are serialized.

To be more accurate lock should be applied to the same sync object used in add\remove event accessor methods which is be default 'this'.

Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly

To share my experience :

Git (my own install) was looking for the key named 'id_rsa'.

So I tried to rename my keys to 'id_rsa' and 'id_rsa.pub' and it worked.

Btw, I'm sure there is an other way to do it but I didn't look deeper yet.

Modifying the "Path to executable" of a windows service

Slight modification to this @CodeMaker 's answer, for anyone like me who is trying to modify a MongoDB service to use authentication.

When I looked at the "Path to executable" in "Services" the executed line already contained speech marks. So I had to make minor modification to his example.

To be specific.

Type Services in Windows
Find MongoDB (or the service you want to change) and open the service, making sure to stop it.
Make a note of the Service Name (not the display name)
Look up and copy the "Path to executable" and copy it.

For me the path was (note the speech marks)

"C:\Program Files\MongoDB\Server\4.2\bin\mongod.exe" --config "C:\Program Files\MongoDB\Server\4.2\bin\mongod.cfg" --service

In a command line type

sc config MongoDB binPath= "<Modified string with \" to replace ">"

In my case this was

sc config MongoDB binPath= "\"C:\Program Files\MongoDB\Server\4.2\bin\mongod.exe\" --config \"C:\Program Files\MongoDB\Server\4.2\bin\mongod.cfg\" --service -- auth"

CSS text-decoration underline color

(for fellow googlers, copied from duplicate question) This answer is outdated since text-decoration-color is now supported by most modern browsers.

You can do this via the following CSS rule as an example:

text-decoration-color:green

If this rule isn't supported by an older browser, you can use the following solution:

Setting your word with a border-bottom:

a:link {
  color: red;
  text-decoration: none;
  border-bottom: 1px solid blue;
}
a:hover {
 border-bottom-color: green;
}

nginx server_name wildcard or catch-all

How to check for valid email address?

There is no point. Even if you can verify that the email address is syntactically valid, you'll still need to check that it was not mistyped, and that it actually goes to the person you think it does. The only way to do that is to send them an email and have them click a link to verify.

Therefore, a most basic check (e.g. that they didn't accidentally entered their street address) is usually enough. Something like: it has exactly one @ sign, and at least one . in the part after the @:

[^@]+@[^@]+\.[^@]+

You'd probably also want to disallow whitespace -- there are probably valid email addresses with whitespace in them, but I've never seen one, so the odds of this being a user error are on your side.

If you want the full check, have a look at this question.

Update: Here's how you could use any such regex:

import re

if not re.match(r"... regex here ...", email):
  # whatever

Python =3.4 has re.fullmatch which is preferable to re.match.

Note the r in front of the string; this way, you won't need to escape things twice.

If you have a large number of regexes to check, it might be faster to compile the regex first:

import re

EMAIL_REGEX = re.compile(r"... regex here ...")

if not EMAIL_REGEX.match(email):
  # whatever

Another option is to use the validate_email package, which actually contacts the SMTP server to verify that the address exists. This still doesn't guarantee that it belongs to the right person, though.

Javascript to set hidden form value on drop down change

$(function() {
$('#myselect').change(function() {
   $('#myhidden').val =$("#myselect option:selected").text();
    });
});

No resource identifier found for attribute '...' in package 'com.app....'

I've been searching answer but couldn't find but finally I could fix this by adding play-service-ads dependency let's try this

*) File -> Project Structure... -> Under the module you can find app and there is a option called dependencies and you can add com.google.android.gms:play-services-ads:x.x.x dependency to your project

I faced this problem when I try to import eclipse project into android studio

Click here to see screenshot

Set a cookie to HttpOnly via Javascript

An HttpOnly cookie means that it's not available to scripting languages like JavaScript. So in JavaScript, there's absolutely no API available to get/set the HttpOnly attribute of the cookie, as that would otherwise defeat the meaning of HttpOnly.

Just set it as such on the server side using whatever server side language the server side is using. If JavaScript is absolutely necessary for this, you could consider to just let it send some (ajax) request with e.g. some specific request parameter which triggers the server side language to create an HttpOnly cookie. But, that would still make it easy for hackers to change the HttpOnly by just XSS and still have access to the cookie via JS and thus make the HttpOnly on your cookie completely useless.

How get all values in a column using PHP?

Here is a simple way to do this using either PDO or mysqli

$stmt = $pdo->prepare("SELECT Column FROM foo");
// careful, without a LIMIT this can take long if your table is huge
$stmt->execute();
$array = $stmt->fetchAll(PDO::FETCH_COLUMN);
print_r($array);

or, using mysqli

$stmt = $mysqli->prepare("SELECT Column FROM foo");
$stmt->execute();
$array = [];
foreach ($stmt->get_result() as $row)
{
    $array[] = $row['column'];
}
print_r($array);

Array
(
    [0] => 7960
    [1] => 7972
    [2] => 8028
    [3] => 8082
    [4] => 8233
)

Testing web application on Mac/Safari when I don't own a Mac

For my case (a small, personal project) https://www.lambdatest.com/ was very helpful. Free tier allows for 6 sessions per month.

How to implement a binary search tree in Python?

class TreeNode:
    def __init__(self, value):
        self.value = value
        self.left = None
        self.right = None


class BinaryTree:
    def __init__(self, root=None):
        self.root = root

    def add_node(self, node, value):
        """
        Node points to the left of value if node > value; right otherwise,
        BST cannot have duplicate values
        """
        if node is not None:
            if value < node.value:
                if node.left is None:
                    node.left = TreeNode(value)
                else:
                    self.add_node(node.left, value)
            else:
                if node.right is None:
                    node.right = TreeNode(value)
                else:
                    self.add_node(node.right, value)
        else:
            self.root = TreeNode(value)

    def search(self, value):
        """
        Value will be to the left of node if node > value; right otherwise.
        """
        node = self.root
        while node is not None:
            if node.value == value:
                return True     # node.value
            if node.value > value:
                node = node.left
            else:
                node = node.right
        return False

    def traverse_inorder(self, node):
        """
        Traverse the left subtree of a node as much as possible, then traverse
        the right subtree, followed by the parent/root node.
        """
        if node is not None:
            self.traverse_inorder(node.left)
            print(node.value)
            self.traverse_inorder(node.right)


def main():
    binary_tree = BinaryTree()
    binary_tree.add_node(binary_tree.root, 200)
    binary_tree.add_node(binary_tree.root, 300)
    binary_tree.add_node(binary_tree.root, 100)
    binary_tree.add_node(binary_tree.root, 30)
    binary_tree.traverse_inorder(binary_tree.root)
    print(binary_tree.search(200))


if __name__ == '__main__':
    main()

Gradient borders

WebKit now (and Chrome 12 at least) supports gradients as border image:

-webkit-border-image: -webkit-gradient(linear, left top, left bottom, from(#00abeb), to(#fff), color-stop(0.5, #fff), color-stop(0.5, #66cc00)) 21 30 30 21 repeat repeat;

Prooflink -- http://www.webkit.org/blog/1424/css3-gradients/
Browser support: http://caniuse.com/#search=border-image

Use string in switch case in java

Everybody is using at least Java 7 now, right? Here is the answer to the original problem:

String myString = getFruitString();

switch (myString) {

    case "apple":
        method1();
        break;

    case "carrot":
        method2();
        break;

    case "mango":
        method3();
        break;

    case "orange":
        method4();
        break;
}

Notes

The case statements are equivalent to using String.equals.
As usual, String matching is case sensitive.
According to the docs, this is generally faster than using chained if-else statements (as in cHao's answer).

How to store command results in a shell variable?

The syntax to store the command output into a variable is var=$(command).

So you can directly do:

result=$(ls -l | grep -c "rahul.*patle")

And the variable $result will contain the number of matches.

Select rows having 2 columns equal value

select * from test;
a1  a2  a3
1   1   2
1   2   2
2   1   2

select t1.a3 from test t1, test t2 where t1.a1 = t2.a1 and t2.a2 = t1.a2 and t1.a1 = t2.a2

a3
1

You can try same thing using Joins too..

Call function with setInterval in jQuery?

I have written a custom code for setInterval function which can also help

_x000D_

let interval;
      
function startInterval(){
  interval = setInterval(appendDateToBody, 1000);
  console.log(interval);
}

function appendDateToBody() {
    document.body.appendChild(
        document.createTextNode(new Date() + " "));
}

function stopInterval() {
    clearInterval(interval);
  console.log(interval);
}

_x000D_

<!DOCTYPE html>
<html>
<head>
    <title>setInterval</title>
</head>
<body>
    <input type="button" value="Stop" onclick="stopInterval();" />
    <input type="button" value="Start" onclick="startInterval();" />
</body>
</html>

_x000D_

How can I check Drupal log files?

To view entries in Drupal's own internal log system (the watchdog database table), go to http://example.com/admin/reports/dblog. These can include Drupal-specific errors as well as general PHP or MySQL errors that have been thrown.

Use the watchdog() function to add an entry to this log from your own custom module.

When Drupal bootstraps it uses the PHP function set_error_handler() to set its own error handler for PHP errors. Therefore, whenever a PHP error occurs within Drupal it will be logged through the watchdog() call at admin/reports/dblog. If you look for PHP fatal errors, for example, in /var/log/apache/error.log and don't see them, this is why. Other errors, e.g. Apache errors, should still be logged in /var/log, or wherever you have it configured to log to.

How to model type-safe enum types?

A slightly less verbose way of declaring named enumerations:

object WeekDay extends Enumeration("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat") {
  type WeekDay = Value
  val Sun, Mon, Tue, Wed, Thu, Fri, Sat = Value
}

WeekDay.valueOf("Wed") // returns Some(Wed)
WeekDay.Fri.toString   // returns Fri

Of course the problem here is that you will need to keep the ordering of the names and vals in sync which is easier to do if name and val are declared on the same line.

Passing a callback function to another class

Delegate is just the base class so you can't use it like that. You could do something like this though:

public void DoRequest(string request, Action<string> callback)
{
     // do stuff....
     callback("asdf");
}

How to delete zero components in a vector in Matlab?

I often ended up doing things like this. Therefore I tried to write a simple function that 'snips' out the unwanted elements in an easy way. This turns matlab logic a bit upside down, but looks good:

b = snip(a,'0')

you can find the function file at: http://www.mathworks.co.uk/matlabcentral/fileexchange/41941-snip-m-snip-elements-out-of-vectorsmatrices

It also works with all other 'x', nan or whatever elements.

libxml/tree.h no such file or directory

Don't put libxml2.dylib under frameworks folder put it under root just below the root(Top left blue icon )

Then Click on the Project (TOP Left blue icon) ,GO to Build Settings,in the search box type "Header Search Paths" and then add the this "$(SDKROOT)/usr/include/libxml2"

This code resolve my issue hope it will help you fix this

Best programming based games

Core Wars is the classic, of course. But Rocky's Boots is another one. Imagine! There was a time (1982) when you could sell a commercial game based on logic gates!

Select current date by default in ASP.Net Calendar control

Two ways of doing it.

Late binding

<asp:Calendar ID="planning" runat="server" SelectedDate="<%# DateTime.Now %>"></asp:Calendar>

Code behind way (Page_Load solution)

protected void Page_Load(object sender, EventArgs e)
{
    BindCalendar();
}

private void BindCalendar()
{
    planning.SelectedDate = DateTime.Today;
}

Altough, I strongly recommend to do it from a BindMyStuff way. Single entry point easier to debug. But since you seems to know your game, you're all set.

How to make Bootstrap 4 cards the same height in card-columns?

Bootstrap 4 has all you need : USE THE .d-flex and .flex-fill class. Don't use the card-decks as they are not responsive. I used col-sm, you can use the .col class you want, or use col-lg-x the x means number of width column e.g 4 or 3 for best view if the post have many then 3 or 4 per column

Try to reduce the browser window to XS to see it in action :

_x000D_

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" />

<link href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,500,500i,700,700i" rel="stylesheet">
<div class="container">
  <div class="row my-4">
    <div class="col">
      <div class="jumbotron">
        <h1>Bootstrap 4 Cards all same height demo</h1>
        <p class="lead">by djibe.</p>
        <span class="text-muted">(thx to BS4)</span>
        <p>Dependencies : standard BS4</p>
        <p>
          Enjoy the magic of flexboxes and leave the useless card-decks.
        </p>
        <div class="container-fluid">
          <div class="row">
            <div class="col-sm d-flex">
              <div class="card card-body flex-fill">
                A small card content.
              </div>
            </div>
            <div class="col-sm d-flex">
              <div class="card card-body flex-fill">
                "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
                in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
              </div>
            </div>
            <div class="col-sm d-flex">
              <div class="card card-body flex-fill">
                Another small card content.
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>

_x000D_

Using "If cell contains #N/A" as a formula condition.

A possible alternative approach in Excel 2010 or later versions:

AGGREGATE(6,6,A1,B1)

In AGGREGATE function the first 6 indicates PRODUCT operation and the second 6 denotes "ignore errors"

[untested]

java.util.Date vs java.sql.Date

The java.util.Date class in Java represents a particular moment in time (e,.g., 2013 Nov 25 16:30:45 down to milliseconds), but the DATE data type in the DB represents a date only (e.g., 2013 Nov 25). To prevent you from providing a java.util.Date object to the DB by mistake, Java doesn’t allow you to set a SQL parameter to java.util.Date directly:

PreparedStatement st = ...
java.util.Date d = ...
st.setDate(1, d); //will not work

But it still allows you to do that by force/intention (then hours and minutes will be ignored by the DB driver). This is done with the java.sql.Date class:

PreparedStatement st = ...
java.util.Date d = ...
st.setDate(1, new java.sql.Date(d.getTime())); //will work

A java.sql.Date object can store a moment in time (so that it’s easy to construct from a java.util.Date) but will throw an exception if you try to ask it for the hours (to enforce its concept of being a date only). The DB driver is expected to recognize this class and just use 0 for the hours. Try this:

public static void main(String[] args) {
  java.util.Date d1 = new java.util.Date(12345);//ms since 1970 Jan 1 midnight
  java.sql.Date d2 = new java.sql.Date(12345);
  System.out.println(d1.getHours());
  System.out.println(d2.getHours());
}

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

top, parent, opener (as well as window, self, and iframe) are all window objects.

window.opener -> returns the window that opens or launches the current popup window.
window.top -> returns the topmost window, if you're using frames, this is the frameset window, if not using frames, this is the same as window or self.
window.parent -> returns the parent frame of the current frame or iframe. The parent frame may be the frameset window or another frame if you have nested frames. If not using frames, parent is the same as the current window or self

DISABLE the Horizontal Scroll

.name 
  { 
      max-width: 100%; 
       overflow-x: hidden; 
   }

You apply the above style or you can create function in javaScript to solve that problem

jquery function val() is not equivalent to "$(this).value="?

Note that :

typeof $(this) is JQuery object.

and

typeof $(this)[0] is HTMLElement object

then : if you want to apply .val() on HTMLElement , you can add this extension .

HTMLElement.prototype.val=function(v){
   if(typeof v!=='undefined'){this.value=v;return this;}
   else{return this.value}
}

Then :

document.getElementById('myDiv').val() ==== $('#myDiv').val()

And

 document.getElementById('myDiv').val('newVal') ==== $('#myDiv').val('newVal')

`?????` INVERSE :

Conversely? if you want to add value property to jQuery object , follow those steps :

Download the full source code (not minified) i.e: example http://code.jquery.com/jquery-1.11.1.js .
Insert Line after L96 , add this code value:"" to init this new prop
Search on jQuery.fn.init , it will be almost Line 2747

enter image description here

Now , assign a value to value prop : (Before return statment add this.value=jQuery(selector).val())

Enjoy now : $('#myDiv').value

How can I dynamically switch web service addresses in .NET without a recompile?

Just a note about difference beetween static and dynamic.

Static: you must set URL property every time you call web service. This because base URL if web service is in the proxy class constructor.
Dynamic: a special configuration key will be created for you in your web.config file. By default proxy class will read URL from this key.

Are complex expressions possible in ng-hide / ng-show?

Use a controller method if you need to run arbitrary JavaScript code, or you could define a filter that returned true or false.

I just tested (should have done that first), and something like ng-show="!a && b" worked as expected.

How to convert QString to int?

On the comments:

sscanf(Abcd, "%f %s", &f,&s);

Gives an Error.

This is the right way:

sscanf(Abcd, "%f %s", &f,qPrintable(s));

The transaction manager has disabled its support for remote/network transactions

Make sure that the "Distributed Transaction Coordinator" Service is running on both database and client. Also make sure you check "Network DTC Access", "Allow Remote Client", "Allow Inbound/Outbound" and "Enable TIP".

To enable Network DTC Access for MS DTC transactions

Open the Component Services snap-in.

To open Component Services, click Start. In the search box, type dcomcnfg, and then press ENTER.
Expand the console tree to locate the DTC (for example, Local DTC) for which you want to enable Network MS DTC Access.
On the Action menu, click Properties.
Click the Security tab and make the following changes: In Security Settings, select the Network DTC Access check box.

In Transaction Manager Communication, select the Allow Inbound and Allow Outbound check boxes.

Add a thousands separator to a total with Javascript or jQuery?

Use toLocaleString()
In your case do:

return "Total Pounds Entered : " + tot.toLocaleString();

Send raw ZPL to Zebra printer via USB

Found amazing simple solution - working for Chrome (Windows, not tested on Mac)

Zebra ZP 450

Go here Zebra Generic Text
Go precisely by the manual
No COM1 or any other ports needed - USB is enough
When done (named the printer ZTEXT), does not matter if it won't print a test page
Turn of Spooling and enable direct printing in Printer Preferences - 1 note here 1 printer is ZP450 CPT and other ZP450 only - on the other one I do not even need to turn off spooling and it worked.
Go to Chrome and printing ZPL from there with Chrome Print Dialog Box by selecting the ZTEXT printer (Generic / Text) Printer (Do not choose Windows Dialog Box) - we needed this for Chrome to be working

How to send POST request?

If you don't want to use a module you have to install like requests, and your use case is very basic, then you can use urllib2

urllib2.urlopen(url, body)

See the documentation for urllib2 here: https://docs.python.org/2/library/urllib2.html.

Getting the URL of the current page using Selenium WebDriver

Put sleep. It will work. I have tried. The reason is that the page wasn't loaded yet. Check this question to know how to wait for load - Wait for page load in Selenium

Django -- Template tag in {% if %} block

You try this.

I have already tried it in my django template.

It will work fine. Just remove the curly braces pair {{ and }} from {{source}}.

I have also added <table> tag and that's it.

After modification your code will look something like below.

{% for source in sources %}
   <table>
      <tr>
          <td>{{ source }}</td>
          <td>
              {% if title == source %}
                Just now! 
              {% endif %}
          </td>
      </tr>
   </table>
{% endfor %}

My dictionary looks like below,

{'title':"Rishikesh", 'sources':["Hemkesh", "Malinikesh", "Rishikesh", "Sandeep", "Darshan", "Veeru", "Shwetabh"]}

and OUTPUT looked like below once my template got rendered.

Hemkesh 
Malinikesh  
Rishikesh   Just now!
Sandeep 
Darshan 
Veeru   
Shwetabh

How to return an array from a function?

Well if you want to return your array from a function you must make sure that the values are not stored on the stack as they will be gone when you leave the function.

So either make your array static or allocate the memory (or pass it in but your initial attempt is with a void parameter). For your method I would define it like this:

int *gnabber(){
  static int foo[] = {1,2,3}
  return foo;
}

Can I underline text in an Android layout?

One line solution

myTextView.setText(Html.fromHtml("<p><u>I am Underlined text</u></p>"));

It is bit late but could be useful for someone.

How to stop/terminate a python script from running?

Windows solution: Control + C.

Macbook solution: Control (^) + C.

Another way is to open a terminal, type top, write down the PID of the process that you would like to kill and then type on the terminal: kill -9 <pid>

SQL Server 2008: How to query all databases sizes?

All seem overly complicated! Or am I missing something?

Surely all you need is something like:

select d.name, case when m.type = 0 then 'Data' else 'Log' end,  m.size * 8 / 1024
from sys.master_files m JOIN sys.databases d ON d.database_id = m.database_id

or if you don't want the log:

select d.name, m.size * 8 / 1024
from sys.master_files m JOIN sys.databases d ON d.database_id = m.database_id and m.type =0

Remove characters from a string

Using replace() with regular expressions is the most flexible/powerful. It's also the only way to globally replace every instance of a search pattern in JavaScript. The non-regex variant of replace() will only replace the first instance.

For example:

var str = "foo gar gaz";

// returns: "foo bar gaz"
str.replace('g', 'b');

// returns: "foo bar baz"
str = str.replace(/g/gi, 'b');

In the latter example, the trailing /gi indicates case-insensitivity and global replacement (meaning that not just the first instance should be replaced), which is what you typically want when you're replacing in strings.

To remove characters, use an empty string as the replacement:

var str = "foo bar baz";

// returns: "foo r z"
str.replace(/ba/gi, '');

Plotting lines connecting points

I realize this question was asked and answered a long time ago, but the answers don't give what I feel is the simplest solution. It's almost always a good idea to avoid loops whenever possible, and matplotlib's plot is capable of plotting multiple lines with one command. If x and y are arrays, then plot draws one line for every column.

In your case, you can do the following:

x=np.array([-1 ,0.5 ,1,-0.5])
xx = np.vstack([x[[0,2]],x[[1,3]]])
y=np.array([ 0.5,  1, -0.5, -1])
yy = np.vstack([y[[0,2]],y[[1,3]]])
plt.plot(xx,yy, '-o')

Have a long list of x's and y's, and want to connect adjacent pairs?

xx = np.vstack([x[0::2],x[1::2]])
yy = np.vstack([y[0::2],y[1::2]])

Want a specified (different) color for the dots and the lines?

plt.plot(xx,yy, '-ok', mfc='C1', mec='C1')

Using setImageDrawable dynamically to set image in an ImageView

Drawable image = ImageOperations(context,ed.toString(),"image.jpg");
            ImageView imgView = new ImageView(context);
            imgView = (ImageView)findViewById(R.id.image1);
            imgView.setImageDrawable(image);

setImageDrawable(getResources().getDrawable(R.drawable.icon));

In Python how should I test if a variable is None, True or False

I would like to stress that, even if there are situations where if expr : isn't sufficient because one wants to make sure expr is True and not just different from 0/None/whatever, is is to be prefered from == for the same reason S.Lott mentionned for avoiding == None.

It is indeed slightly more efficient and, cherry on the cake, more human readable.

In [1]: %timeit (1 == 1) == True
38.1 ns ± 0.116 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [2]: %timeit (1 == 1) is True
33.7 ns ± 0.141 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

How to have Java method return generic list of any type?

You can use the old way:

public List magicalListGetter() {
    List list = doMagicalVooDooHere();

    return list;
}

or you can use Object and the parent class of everything:

public List<Object> magicalListGetter() {
    List<Object> list = doMagicalVooDooHere();

    return list;
}

Note Perhaps there is a better parent class for all the objects you will put in the list. For example, Number would allow you to put Double and Integer in there.

Android Gradle 5.0 Update:Cause: org.jetbrains.plugins.gradle.tooling.util

This issue is due to incompatible of your plugin Verison and required Gradle version; they need to match with each other. I am sharing how my problem was solved.

plugin version

Required Gradle version is here

more compatibility you can see from here. Android Plugin for Gradle Release Notes

if you have the android studio version 4.0.1

then your top level gradle file must be like this

buildscript {
repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:4.0.2'
    classpath 'com.google.firebase:firebase-crashlytics-gradle:2.4.1'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

and the gradle version should be

and your app gradle look like this

OpenSSL and error in reading openssl.conf file

Just create an openssl.cnf file yourself like this in step 4: http://www.flatmtn.com/article/setting-openssl-create-certificates

Edit after link stopped working The content of the openssl.cnf file was the following:

#
# OpenSSL configuration file.
#

# Establish working directory.

dir                 = .

[ ca ]
default_ca              = CA_default

[ CA_default ]
serial                  = $dir/serial
database                = $dir/certindex.txt
new_certs_dir               = $dir/certs
certificate             = $dir/cacert.pem
private_key             = $dir/private/cakey.pem
default_days                = 365
default_md              = md5
preserve                = no
email_in_dn             = no
nameopt                 = default_ca
certopt                 = default_ca
policy                  = policy_match

[ policy_match ]
countryName             = match
stateOrProvinceName         = match
organizationName            = match
organizationalUnitName          = optional
commonName              = supplied
emailAddress                = optional

[ req ]
default_bits                = 1024          # Size of keys
default_keyfile             = key.pem       # name of generated keys
default_md              = md5               # message digest algorithm
string_mask             = nombstr       # permitted characters
distinguished_name          = req_distinguished_name
req_extensions              = v3_req

[ req_distinguished_name ]
# Variable name             Prompt string
#-------------------------    ----------------------------------
0.organizationName          = Organization Name (company)
organizationalUnitName          = Organizational Unit Name (department, division)
emailAddress                = Email Address
emailAddress_max            = 40
localityName                = Locality Name (city, district)
stateOrProvinceName         = State or Province Name (full name)
countryName             = Country Name (2 letter code)
countryName_min             = 2
countryName_max             = 2
commonName              = Common Name (hostname, IP, or your name)
commonName_max              = 64

# Default values for the above, for consistency and less typing.
# Variable name             Value
#------------------------     ------------------------------
0.organizationName_default      = My Company
localityName_default            = My Town
stateOrProvinceName_default     = State or Providence
countryName_default         = US

[ v3_ca ]
basicConstraints            = CA:TRUE
subjectKeyIdentifier            = hash
authorityKeyIdentifier          = keyid:always,issuer:always

[ v3_req ]
basicConstraints            = CA:FALSE
subjectKeyIdentifier            = hash

Drop all data in a pandas dataframe

My favorite way is:

df = df[0:0]

The mysqli extension is missing. Please check your PHP configuration

Replace

include_path=C:\Program Files (x86)\xampp\php\PEAR

with following

include_path="C:\Program Files (x86)\xampp\php\PEAR"

i.e Add commas , i checked apache error logs it was showing syntax error so checked whole file for syntax errors.

What is the string length of a GUID?

22 bytes, if you do it like this:

System.Guid guid = System.Guid.NewGuid();
byte[] guidbytes = guid.ToByteArray();
string uuid = Convert.ToBase64String(guidbytes).Trim('=');

Unable to find velocity template resources

I have put this working code snippet for future references. The code sample was written with Apache velocity version 1.7 with embedded Jetty.

Velocity template path is located at the resource folder email_templates subfolder.

Code Snippet in Java (Snippets are worked both running on eclipse and inside a Jar)

    templateName = "/email_templates/byoa.tpl.vm"
    VelocityEngine ve = new VelocityEngine();
    ve.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
    ve.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());
    ve.init();
    Template t = ve.getTemplate(this.templateName);
    VelocityContext velocityContext = new VelocityContext();
    velocityContext.put("","") // put your template values here
    StringWriter writer = new StringWriter();
    t.merge(this.velocityContext, writer);

System.out.println(writer.toString()); // print the updated template as string

For OSGI plugging code snippets.

final String TEMPLATE = "resources/template.vm" // located in the resources folder
Thread current = Thread.currentThread();
       ClassLoader oldLoader = current.getContextClassLoader();
       try {
          current.setContextClassLoader(TemplateHelper.class.getClassLoader()); // TemplateHelper is a class inside your jar file
          Properties p = new Properties();
          p.setProperty("resource.loader", "class");
          p.setProperty("class.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
          Velocity.init( p );       
          VelocityEngine ve = new VelocityEngine();
          Template template = Velocity.getTemplate( TEMPLATE );
          VelocityContext context = new VelocityContext();
          context.put("tc", obj);
          StringWriter writer = new StringWriter();
          template.merge( context, writer );
          return writer.toString() ;  
       }  catch(Exception e){
          e.printStackTrace();
       } finally {
          current.setContextClassLoader(oldLoader);
       }

CodeIgniter - How to return Json response from controller

//do the edit in your javascript

$('.signinform').submit(function() { 
   $(this).ajaxSubmit({ 
       type : "POST",
       //set the data type
       dataType:'json',
       url: 'index.php/user/signin', // target element(s) to be updated with server response 
       cache : false,
       //check this in Firefox browser
       success : function(response){ console.log(response); alert(response)},
       error: onFailRegistered
   });        
   return false; 
}); 


//controller function

public function signin() {
    $arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);    

   //add the header here
    header('Content-Type: application/json');
    echo json_encode( $arr );
}

How to send a header using a HTTP request through a curl call?

man curl:

   -H/--header <header>
          (HTTP)  Extra header to use when getting a web page. You may specify
          any number of extra headers. Note that if you should  add  a  custom
          header that has the same name as one of the internal ones curl would
          use, your externally set header will be used instead of the internal
          one.  This  allows  you  to make even trickier stuff than curl would
          normally do. You should not replace internally set  headers  without
          knowing  perfectly well what you're doing. Remove an internal header
          by giving a replacement without content on the  right  side  of  the
          colon, as in: -H "Host:".

          curl  will  make sure that each header you add/replace get sent with
          the proper end of line marker, you should thus not  add  that  as  a
          part  of the header content: do not add newlines or carriage returns
          they will only mess things up for you.

          See also the -A/--user-agent and -e/--referer options.

          This option can be used multiple times to add/replace/remove  multi-
          ple headers.

Example:

curl --header "X-MyHeader: 123" www.google.com

You can see the request that curl sent by adding the -v option.

How to show matplotlib plots in python

You must use plt.show() at the end in order to see the plot

Get pixel's RGB using PIL

Not PIL, but imageio.imread might still be interesting:

import imageio
im = scipy.misc.imread('um_000000.png', flatten=False, mode='RGB')
im = imageio.imread('Figure_1.png', pilmode='RGB')
print(im.shape)

gives

(480, 640, 3)

so it is (height, width, channels). So the pixel at position (x, y) is

color = tuple(im[y][x])
r, g, b = color

Outdated

scipy.misc.imread is deprecated in SciPy 1.0.0 (thanks for the reminder, fbahr!)

Node update a specific package

Most of the time you can just npm update (or yarn upgrade) a module to get the latest non breaking changes (respecting the semver specified in your package.json) (<-- read that last part again).

npm update browser-sync
-------
yarn upgrade browser-sync

Use npm|yarn outdated to see which modules have newer versions

Use npm update|yarn upgrade (without a package name) to update all modules

Include --save-dev|--dev if you want to save the newer version numbers to your package.json. (NOTE: as of npm v5.0 this is only necessary for devDependencies).

Major version upgrades:

In your case, it looks like you want the next major version (v2.x.x), which is likely to have breaking changes and you will need to update your app to accommodate those changes. You can install/save the latest 2.x.x by doing:

npm install browser-sync@2 --save-dev
-------
yarn add browser-sync@2 --dev

...or the latest 2.1.x by doing:

npm install [email protected] --save-dev
-------
yarn add [email protected] --dev

...or the latest and greatest by doing:

npm install browser-sync@latest --save-dev
-------
yarn add browser-sync@latest --dev

Note: the last one is no different than doing this:
npm uninstall browser-sync --save-dev
npm install browser-sync --save-dev
-------
yarn remove browser-sync --dev
yarn add browser-sync --dev
The --save-dev part is important. This will uninstall it, remove the value from your package.json, and then reinstall the latest version and save the new value to your package.json.

How to compile a static library in Linux?

Generate the object files with gcc, then use ar to bundle them into a static library.

How to uninstall pip on OSX?

In order to completely remove pip, I believe you have to delete its files from all Python versions on your computer. For me, they are here:

cd /Library/Frameworks/Python.framework/Versions/Current/bin/
cd /Library/Frameworks/Python.framework/Versions/3.3/bin/

You may need to remove the files or the directories located at these file-paths (and more, depending on the number of versions of Python you have installed).

Edit: to find all versions of pip on your machine, use: find / -name pip 2>/dev/null, which starts at its highest level (hence the /) and hides all error messages (that's what 2>/dev/null does). This is my output:

$ find / -name pip 2>/dev/null
/Library/Frameworks/Python.framework/Versions/2.7/bin/pip
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip
/Library/Frameworks/Python.framework/Versions/3.3/bin/pip
/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/pip
/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/pip
/Library/Frameworks/Python.framework/Versions/7.1/bin/pip
/Library/Frameworks/Python.framework/Versions/7.1/lib/python2.7/site-packages/pip-1.4.1-py2.7.egg/pip

Port 80 is being used by SYSTEM (PID 4), what is that?

WORKING SOLUTION TESTED:(WINDOWS 10)

There are many reasona for this, the one cause/solution i recommended is this:

OPEN YOUR WINDOW COMMAND WITH ADMINISTRATOR PREVILEGE THEN:

net stop http /y

the above will agree to stop http service then:

sc config http start= disabled

the above will configure service to disable by default

IF ABOVE SOLUTION DOES NOT WORK FIND YOUR SPECIFIC CASE HERE:

SOURCE: http://www.devside.net/wamp-server/opening-up-port-80-for-apache-to-use-on-windows

RESTART YOUR WEB SERVER/XAMPP/APACHE AND DONE.

If you ever need to re-enable to default here is the command sc config HTTP start= demand the source of explanation is here http://servicedefaults.com/10/http/

C++ Remove new line from multiline string

s.erase(std::remove(s.begin(), s.end(), '\n'), s.end());

Reflection generic get field value

Although it's not really clear to me what you're trying to achieve, I spotted an obvious error in your code: Field.get() expects the object which contains the field as argument, not some (possible) value of that field. So you should have field.get(object).

Since you appear to be looking for the field value, you can obtain that as:

Object objectValue = field.get(object);

No need to instantiate the field type and create some empty/default value; or maybe there's something I missed.

Jackson with JSON: Unrecognized field, not marked as ignorable

using Jackson 2.6.0, this worked for me:

private static final ObjectMapper objectMapper = 
    new ObjectMapper()
        .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

and with setting:

@JsonIgnoreProperties(ignoreUnknown = true)

How do you resize a form to fit its content automatically?

By using the various sizing properties (Dock, Anchor) or container controls (Panel, TableLayoutPanel, FlowLayoutPanel, etc.) you can only dictate the size from the outer control down to the inner controls. But there is nothing (working) within the .Net framework that allows to dictate the size of a container through the size of the child control. I also missed this a few times and tried the AutoSize property, but it never worked.

So all you can do is trying to get this stuff done manually, sorry.

How to synchronize a static variable among threads running different instances of a class in Java?

Yes it is true.

If you create two instance of your class

Test t1 = new Test();
Test t2 = new Test();

Then t1.foo and t2.foo both synchronize on the same static object and hence block each other.

MySQL compare DATE string with string from DATETIME field

SELECT * FROM `calendar` WHERE startTime like '2010-04-29%'

You can also use comparison operators on MySQL dates if you want to find something after or before. This is because they are written in such a way (largest value to smallest with leading zeros) that a simple string sort will sort them correctly.

Trigger back-button functionality on button click in Android

layout.xml

<Button
    android:id="@+id/buttonBack"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="finishActivity"
    android:text="Back" />

Activity.java

public void finishActivity(View v){
    finish();
}

Get PostGIS version

As the above people stated, select PostGIS_full_version(); will answer your question. On my machine, where I'm running PostGIS 2.0 from trunk, I get the following output:

postgres=# select PostGIS_full_version();
postgis_full_version                                                                  
-------------------------------------------------------------------------------------------------------------------------------------------------------
POSTGIS="2.0.0alpha4SVN" GEOS="3.3.2-CAPI-1.7.2" PROJ="Rel. 4.7.1, 23 September 2009" GDAL="GDAL 1.8.1, released 2011/07/09" LIBXML="2.7.3" USE_STATS
(1 row)

You do need to care about the versions of PROJ and GEOS that are included if you didn't install an all-inclusive package - in particular, there's some brokenness in GEOS prior to 3.3.2 (as noted in the postgis 2.0 manual) in dealing with geometry validity.

Replace whitespaces with tabs in linux

better tr command:

tr [:blank:] \\t

This will clean up the output of say, unzip -l , for further processing with grep, cut, etc.

e.g.,

unzip -l some-jars-and-textfiles.zip | tr [:blank:] \\t | cut -f 5 | grep jar

Cannot obtain value of local or argument as it is not available at this instruction pointer, possibly because it has been optimized away

Go to Project Properties and under Build Make sure that the "Optimize Code" checkbox is unchecked.

Also, set the "Debug Info" dropdown to "Full" in the Advanced Options (Under Build tab).

Multiple models in a view

Add this ModelCollection.cs to your Models

using System;
using System.Collections.Generic;

namespace ModelContainer
{
  public class ModelCollection
  {
   private Dictionary<Type, object> models = new Dictionary<Type, object>();

   public void AddModel<T>(T t)
   {
      models.Add(t.GetType(), t);
   }

   public T GetModel<T>()
   {
     return (T)models[typeof(T)];
   }
 }
}

Controller:

public class SampleController : Controller
{
  public ActionResult Index()
  {
    var model1 = new Model1();
    var model2 = new Model2();
    var model3 = new Model3();

    // Do something

    var modelCollection = new ModelCollection();
    modelCollection.AddModel(model1);
    modelCollection.AddModel(model2);
    modelCollection.AddModel(model3);
    return View(modelCollection);
  }
}

The View:

enter code here
@using Models
@model ModelCollection

@{
  ViewBag.Title = "Model1: " + ((Model.GetModel<Model1>()).Name);
}

<h2>Model2: @((Model.GetModel<Model2>()).Number</h2>

@((Model.GetModel<Model3>()).SomeProperty

Add property to an array of objects

You can use the forEach method to execute a provided function once for each element in the array. In this provided function you can add the Active property to the element.

Results.forEach(function (element) {
  element.Active = "false";
});

Excel VBA - exit for loop

IntelliJ - Convert a Java project/module into a Maven project/module

Right-click on the module, select "Add framework support...", and check the "Maven" technology.

(This also creates a pom.xml for you to modify.)

If you mean adding source repository elements, I think you need to do that manually–not sure.

Pre-IntelliJ 13 this won't convert the project to the Maven Standard Directory Layout, 13+ it will.

replace String with another in java

Replacing one string with another can be done in the below methods

Method 1: Using String replaceAll

 String myInput = "HelloBrother";
 String myOutput = myInput.replaceAll("HelloBrother", "Brother"); // Replace hellobrother with brother
 ---OR---
 String myOutput = myInput.replaceAll("Hello", ""); // Replace hello with empty
 System.out.println("My Output is : " +myOutput);

Method 2: Using Pattern.compile

 import java.util.regex.Pattern;
 String myInput = "JAVAISBEST";
 String myOutputWithRegEX = Pattern.compile("JAVAISBEST").matcher(myInput).replaceAll("BEST");
 ---OR -----
 String myOutputWithRegEX = Pattern.compile("JAVAIS").matcher(myInput).replaceAll("");
 System.out.println("My Output is : " +myOutputWithRegEX);

Method 3: Using Apache Commons as defined in the link below:

http://commons.apache.org/proper/commons-lang/javadocs/api-z.1/org/apache/commons/lang3/StringUtils.html#replace(java.lang.String, java.lang.String, java.lang.String)

REFERENCE

Place cursor at the end of text in EditText

You could also place the cursor at the end of the text in the EditText view like this:

EditText et = (EditText)findViewById(R.id.textview);
int textLength = et.getText().length();
et.setSelection(textLength, textLength);

How to find length of a string array?

I think you are looking for this

String[] car = new String[10];
int size = car.length;

Deleting a local branch with Git

Like others mentioned you cannot delete current branch in which you are working.

In my case, I have selected "Test_Branch" in Visual Studio and was trying to delete "Test_Branch" from Sourcetree (Git GUI). And was getting below error message.

Cannot delete branch 'Test_Branch' checked out at '[directory location]'.

Switched to different branch in Visual Studio and was able to delete "Test_Branch" from Sourcetree.

I hope this helps someone who is using Visual Studio & Sourcetree.

Using stored procedure output parameters in C#

I slightly modified your stored procedure (to use SCOPE_IDENTITY) and it looks like this:

CREATE PROCEDURE usp_InsertContract
    @ContractNumber varchar(7),
    @NewId int OUTPUT
AS
BEGIN
    INSERT INTO [dbo].[Contracts] (ContractNumber)
    VALUES (@ContractNumber)

    SELECT @NewId = SCOPE_IDENTITY()
END

I tried this and it works just fine (with that modified stored procedure):

// define connection and command, in using blocks to ensure disposal
using(SqlConnection conn = new SqlConnection(pvConnectionString ))
using(SqlCommand cmd = new SqlCommand("dbo.usp_InsertContract", conn))
{
    cmd.CommandType = CommandType.StoredProcedure;

    // set up the parameters
    cmd.Parameters.Add("@ContractNumber", SqlDbType.VarChar, 7);
    cmd.Parameters.Add("@NewId", SqlDbType.Int).Direction = ParameterDirection.Output;

    // set parameter values
    cmd.Parameters["@ContractNumber"].Value = contractNumber;

    // open connection and execute stored procedure
    conn.Open();
    cmd.ExecuteNonQuery();

    // read output value from @NewId
    int contractID = Convert.ToInt32(cmd.Parameters["@NewId"].Value);
    conn.Close();
}

Does this work in your environment, too? I can't say why your original code won't work - but when I do this here, VS2010 and SQL Server 2008 R2, it just works flawlessly....

If you don't get back a value - then I suspect your table Contracts might not really have a column with the IDENTITY property on it.

Object not found! The requested URL was not found on this server. localhost

One thing I found out is that your folder holding your php/html files cannot be named the same name as the folder in your HTDOCS carrying your project.

C program to check little vs. big endian

Thought I knew I had read about that in the standard; but can't find it. Keeps looking. Old; answering heading; not Q-tex ;P:

The following program would determine that:

#include <stdio.h>
#include <stdint.h>

int is_big_endian(void)
{
    union {
        uint32_t i;
        char c[4];
    } e = { 0x01000000 };

    return e.c[0];
}

int main(void)
{
    printf("System is %s-endian.\n",
        is_big_endian() ? "big" : "little");

    return 0;
}

You also have this approach; from Quake II:

byte    swaptest[2] = {1,0};
if ( *(short *)swaptest == 1) {
    bigendien = false;

And !is_big_endian() is not 100% to be little as it can be mixed/middle.

Believe this can be checked using same approach only change value from 0x01000000 to i.e. 0x01020304 giving:

switch(e.c[0]) {
case 0x01: BIG
case 0x02: MIX
default: LITTLE

But not entirely sure about that one ...

Get textarea text with javascript or Jquery

Try .html() instead of .val() :

var text = $('#frame1').contents().find('#area1').html();

C# : changing listbox row color?

How about

      MyLB is a listbox

        Label ll = new Label();
        ll.Width = MyLB.Width;
        ll.Content = ss;
        if(///<some condition>///)
            ll.Background = Brushes.LightGreen;
        else
            ll.Background = Brushes.LightPink;
        MyLB.Items.Add(ll);

What is the difference between #include <filename> and #include "filename"?

By the standard - yes, they are different:

A preprocessing directive of the form
#include <h-char-sequence> new-line
searches a sequence of implementation-defined places for a header identified uniquely by the specified sequence between the < and > delimiters, and causes the replacement of that directive by the entire contents of the header. How the places are specified or the header identified is implementation-defined.
A preprocessing directive of the form
#include "q-char-sequence" new-line
causes the replacement of that directive by the entire contents of the source file identified by the specified sequence between the " delimiters. The named source file is searched for in an implementation-defined manner. If this search is not supported, or if the search fails, the directive is reprocessed as if it read
#include <h-char-sequence> new-line
with the identical contained sequence (including > characters, if any) from the original directive.
A preprocessing directive of the form
#include pp-tokens new-line
(that does not match one of the two previous forms) is permitted. The preprocessing tokens after include in the directive are processed just as in normal text. (Each identifier currently defined as a macro name is replaced by its replacement list of preprocessing tokens.) The directive resulting after all replacements shall match one of the two previous forms. The method by which a sequence of preprocessing tokens between a < and a > preprocessing token pair or a pair of " characters is combined into a single header name preprocessing token is implementation-defined.
Definitions:

h-char: any member of the source character set except the new-line character and >

q-char: any member of the source character set except the new-line character and "

Note that the standard does not tell any relation between the implementation-defined manners. The first form searches in one implementation-defined way, and the other in a (possibly other) implementation-defined way. The standard also specifies that certain include files shall be present (for example, <stdio.h>).

Formally you'd have to read the manual for your compiler, however normally (by tradition) the #include "..." form searches the directory of the file in which the #include was found first, and then the directories that the #include <...> form searches (the include path, eg system headers).

Can constructors be async?

Constructor acts very similarly to a method returning the constructed type. And async method can't return just any type, it has to be either “fire and forget” void, or Task.

If the constructor of type T actually returned Task<T>, that would be very confusing, I think.

If the async constructor behaved the same way as an async void method, that kind of breaks what constructor is meant to be. After constructor returns, you should get a fully initialized object. Not an object that will be actually properly initialized at some undefined point in the future. That is, if you're lucky and the async initialization doesn't fail.

All this is just a guess. But it seems to me that having the possibility of an async constructor brings more trouble than it's worth.

If you actually want the “fire and forget” semantics of async void methods (which should be avoided, if possible), you can easily encapsulate all the code in an async void method and call that from your constructor, as you mentioned in the question.

Angular directives - when and how to use compile, controller, pre-link and post-link

Pre-link function

Each directive's pre-link function is called whenever a new related element is instantiated.

As seen previously in the compilation order section, pre-link functions are called parent-then-child, whereas post-link functions are called child-then-parent.

The pre-link function is rarely used, but can be useful in special scenarios; for example, when a child controller registers itself with the parent controller, but the registration has to be in a parent-then-child fashion (ngModelController does things this way).

Do not:

Inspect child elements (they may not be rendered yet, bound to scope, etc.).

.keyCode vs. .which

jQuery normalises event.which depending on whether event.which, event.keyCode or event.charCode is supported by the browser:

// Add which for key events
if ( event.which == null && (event.charCode != null || event.keyCode != null) ) {
   event.which = event.charCode != null ? event.charCode : event.keyCode;
}

An added benefit of .which is that jQuery does it for mouse clicks too:

// Add which for click: 1 === left; 2 === middle; 3 === right
// Note: button is not normalized, so don't use it
if ( !event.which && event.button !== undefined ) {
    event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) ));
}

Is it possible to decompile an Android .apk file?

Download this jadx tool https://sourceforge.net/projects/jadx/files/

Unzip it and than in lib folder run jadx-gui-0.6.1.jar file now browse your apk file. It's done. Automatically apk will decompile and save it by pressing save button. Hope it will work for you. Thanks

ImportError: No module named Image

On a system with both Python 2 and 3 installed and with pip2-installed Pillow failing to provide Image, it is possible to install PIL for Python 2 in a way that will solve ImportError: No module named Image:

easy_install-2.7 --user PIL

sudo easy_install-2.7 PIL

Java enum - why use toString instead of name

You can also use something like the code below. I used lombok to avoid writing some of the boilerplate codes for getters and constructor.

@AllArgsConstructor
@Getter
public enum RetroDeviceStatus {
    DELIVERED(0,"Delivered"),
    ACCEPTED(1, "Accepted"),
    REJECTED(2, "Rejected"),
    REPAIRED(3, "Repaired");

    private final Integer value;
    private final String stringValue;

    @Override
    public String toString() {
        return this.stringValue;
    }
}

How to load all modules in a folder?

List all python (.py) files in the current folder and put them as __all__ variable in __init__.py

from os.path import dirname, basename, isfile, join
import glob
modules = glob.glob(join(dirname(__file__), "*.py"))
__all__ = [ basename(f)[:-3] for f in modules if isfile(f) and not f.endswith('__init__.py')]

Force overwrite of local file with what's in origin repo?

If you want to overwrite only one file:

git fetch
git checkout origin/master <filepath>

If you want to overwrite all changed files:

git fetch
git reset --hard origin/master

(This assumes that you're working on master locally and you want the changes on the origin's master - if you're on a branch, substitute that in instead.)

How to Deep clone in javascript

Lo-Dash, now a superset of Underscore.js, has a couple of deep clone functions:

_.cloneDeep(object)
_.cloneDeepWith(object, (val) => {if(_.isElement(val)) return val.cloneNode(true)})

the second parameter is a function that is invoked to produce the cloned value.

From an answer of the author himself:

lodash underscore build is provided to ensure compatibility with the latest stable version of Underscore.

Is there any difference between "!=" and "<>" in Oracle Sql?

According to this article, != performs faster

http://www.dba-oracle.com/t_not_equal_operator.htm

phpmyadmin "no data received to import" error, how to fix?

xampp in ubuntu

cd /opt/lampp/etc
vim php.ini

Find:
  post_max_size = 8M
  upload_max_filesize = 2M
  max_execution_time = 30
  max_input_time = 60
  memory_limit = 8M

Change to:
  post_max_size = 750M
  upload_max_filesize = 750M
  max_execution_time = 5000
  max_input_time = 5000
  memory_limit = 1000M

sudo /opt/lampp/lampp restart

What is NODE_ENV and how to use it in Express?

NODE_ENV is an environmental variable that stands for node environment in express server.

It's how we set and detect which environment we are in.

It's very common using production and development.

Set:

export NODE_ENV=production

Get:

You can get it using app.get('env')

How do I include inline JavaScript in Haml?

You can actually do what Chris Chalmers does in his answer, but you must make sure that HAML doesn't parse the JavaScript. This approach is actually useful when you need to use a different type than text/javascript, which is was I needed to do for MathJax.

You can use the plain filter to keep HAML from parsing the script and throwing an illegal nesting error:

%script{type: "text/x-mathjax-config"}
  :plain
    MathJax.Hub.Config({
      tex2jax: {
        inlineMath: [["$","$"],["\\(","\\)"]]
      }
    });

How to dump only specific tables from MySQL?

If you're in local machine then use this command

/usr/local/mysql/bin/mysqldump -h127.0.0.1 --port = 3306 -u [username] -p [password] --databases [db_name] --tables [tablename] > /to/path/tablename.sql;

For remote machine, use below one

/usr/local/mysql/bin/mysqldump -h [remoteip] --port = 3306 -u [username] -p [password] --databases [db_name] --tables [tablename] > /to/path/tablename.sql;

jQuery Refresh/Reload Page if Ajax Success after time

Lots of good answers here, just out of curiosity after looking into this today, is it not best to use setInterval rather than the setTimeout?

setInterval(function() {
location.reload();
}, 30000);

let me know you thoughts.

Unable to load Private Key. (PEM routines:PEM_read_bio:no start line:pem_lib.c:648:Expecting: ANY PRIVATE KEY)

I changed the header and footer of the PEM file to

-----BEGIN RSA PRIVATE KEY-----

and

-----END RSA PRIVATE KEY-----

Finally, it works!

How to find which version of Oracle is installed on a Linux server (In terminal)

As the user running the Oracle Database one can also try $ORACLE_HOME/OPatch/opatch lsinventory which shows the exact version and patches installed.

For example this is a quick oneliner which should only return the version number:

$ORACLE_HOME/OPatch/opatch lsinventory | awk '/^Oracle Database/ {print $NF}'

Best way to parse RSS/Atom feeds with PHP

The PHP RSS reader - http://www.scriptol.com/rss/rss-reader.php - is a complete but simple parser used by thousand of users...

Can't import my own modules in Python

What does "while True" mean in Python?

Nothing evaluates to True faster than True. So, it is good if you use while True instead of while 1==1 etc.

How to add item to the beginning of List<T>?

Update: a better idea, set the "AppendDataBoundItems" property to true, then declare the "Choose item" declaratively. The databinding operation will add to the statically declared item.

<asp:DropDownList ID="ddl" runat="server" AppendDataBoundItems="true">
    <asp:ListItem Value="0" Text="Please choose..."></asp:ListItem>
</asp:DropDownList>

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.appenddatabounditems.aspx

-Oisin

Bootstrap 4 multiselect dropdown

Because the bootstrap-select is a bootstrap component and therefore you need to include it in your code as you did for your V3

NOTE: this component only works in boostrap-4 since version 1.13.0

_x000D_

$('select').selectpicker();

_x000D_

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">_x000D_
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.1/css/bootstrap-select.css" />_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.bundle.min.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.1/js/bootstrap-select.min.js"></script>_x000D_
_x000D_
_x000D_
_x000D_
<select class="selectpicker" multiple data-live-search="true">_x000D_
  <option>Mustard</option>_x000D_
  <option>Ketchup</option>_x000D_
  <option>Relish</option>_x000D_
</select>

_x000D_

Do I need a content-type header for HTTP GET requests?

The problem with not passing over the content-type on a GET message is that sure the content-type is irrelevant because the server side determines the content anyway. The problem that I have encountered is that there are now a lot of places that set up their webservices to be smart enough to pick up the content-type that you pass and return the response in the 'type' that you request. Eg. we are currently messaging with a place that defaults to JSON, however, they have set their webservice up so that if you pass a content-type of xml they will then return xml rather than their JSON default. Which I think going forward is a great idea

Push commits to another branch

_x000D_

git init _x000D_
#git remote remove origin_x000D_
git remote add origin  <http://...git>_x000D_
echo "This is for demo" >> README.md _x000D_
git add README.md_x000D_
git commit -m "Initail Commit" _x000D_
git checkout -b branch1 _x000D_
git branch --list_x000D_
****add files***_x000D_
git add -A_x000D_
git status_x000D_
git commit -m "Initial - branch1"_x000D_
git push --set-upstream origin branch1_x000D_
#git push origin --delete  branch1_x000D_
#git branch --unset-upstream

_x000D_

Git: Permission denied (publickey) fatal - Could not read from remote repository. while cloning Git repository

Remove remote origin

git remote remove origin

Add HTTP remote origin

Difference between size and length methods?

Based on the syntax I'm assuming that it is some language which is descendant of C. As per what I have seen, length is used for simple collection items like arrays and in most cases it is a property.

size() is a function and is used for dynamic collection objects. However for all the purposes of using, you wont find any differences in outcome using either of them. In most implementations, size simply returns length property.

Understanding colors on Android (six characters)

Android uses hexadecimal ARGB values, which are formatted as #AARRGGBB. That first pair of letters, the AA, represent the alpha channel. You must convert your decimal opacity values to a hexadecimal value. Here are the steps:

Alpha Hex Value Process

Take your opacity as a decimal value and multiply it by 255. So, if you have a block that is 50% opaque the decimal value would be .5. For example: .5 x 255 = 127.5
The fraction won't convert to hexadecimal, so you must round your number up or down to the nearest whole number. For example: 127.5 rounds up to 128; 55.25 rounds down to 55.
Enter your decimal value in a decimal-to-hexadecimal converter, like http://www.binaryhexconverter.com/decimal-to-hex-converter, and convert your values.
If you only get back a single value, prefix it with a zero. For example, if you're trying to get 5% opacity and you're going through this process, you'll end up with the hexadecimal value of D. Add a zero in front of it so it appears as 0D.

That's how you find the alpha channel value. I've taken the liberty to put together a list of values for you. Enjoy!

Hex Opacity Values

100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C
50% — 80
45% — 73
40% — 66
35% — 59
30% — 4D
25% — 40
20% — 33
15% — 26
10% — 1A
5% — 0D
0% — 00

PopupWindow $BadTokenException: Unable to add window -- token null is not valid

Try to use it

LayoutInflater inflater = (LayoutInflater).getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
View view = inflate.from(YourActivity.this).inflate(R.layout.yourLayout, null);

Replace line break characters with <br /> in ASP.NET MVC Razor view

I needed to break some text into paragraphs ("p" tags), so I created a simple helper using some of the recommendations in previous answers (thank you guys).

public static MvcHtmlString ToParagraphs(this HtmlHelper html, string value) 
    { 
        value = html.Encode(value).Replace("\r", String.Empty);
        var arr = value.Split('\n').Where(a => a.Trim() != string.Empty);
        var htmlStr = "<p>" + String.Join("</p><p>", arr) + "</p>";
        return MvcHtmlString.Create(htmlStr);
    }

Usage:

@Html.ToParagraphs(Model.Comments)

How can I force users to access my page over HTTPS instead of HTTP?

use htaccess:

#if domain has www. and not https://
  RewriteCond %{HTTPS} =off [NC]
  RewriteCond %{HTTP_HOST} ^(?i:www+\.+[^.]+\.+[^.]+)$
  RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [QSA,L,R=307]

#if domain has not www.
  RewriteCond %{HTTP_HOST} ^([^.]+\.+[^.]+)$
  RewriteRule ^(.*)$ https://www.%{HTTP_HOST}%{REQUEST_URI} [QSA,L,R=307]

How to Create a Form Dynamically Via Javascript

some thing as follows ::

Add this After the body tag

This is a rough sketch, you will need to modify it according to your needs.

<script>
var f = document.createElement("form");
f.setAttribute('method',"post");
f.setAttribute('action',"submit.php");

var i = document.createElement("input"); //input element, text
i.setAttribute('type',"text");
i.setAttribute('name',"username");

var s = document.createElement("input"); //input element, Submit button
s.setAttribute('type',"submit");
s.setAttribute('value',"Submit");

f.appendChild(i);
f.appendChild(s);

//and some more input elements here
//and dont forget to add a submit button

document.getElementsByTagName('body')[0].appendChild(f);

</script>

SVG: text inside rect

Programmatically display text over rect using basic Javascript

_x000D_

 var svg = document.getElementsByTagNameNS('http://www.w3.org/2000/svg', 'svg')[0];_x000D_
_x000D_
        var text = document.createElementNS('http://www.w3.org/2000/svg', 'text');_x000D_
        text.setAttribute('x', 20);_x000D_
        text.setAttribute('y', 50);_x000D_
        text.setAttribute('width', 500);_x000D_
        text.style.fill = 'red';_x000D_
        text.style.fontFamily = 'Verdana';_x000D_
        text.style.fontSize = '35';_x000D_
        text.innerHTML = "Some text line";_x000D_
_x000D_
        svg.appendChild(text);_x000D_
_x000D_
        var text2 = document.createElementNS('http://www.w3.org/2000/svg', 'text');_x000D_
        text2.setAttribute('x', 20);_x000D_
        text2.setAttribute('y', 100);_x000D_
        text2.setAttribute('width', 500);_x000D_
        text2.style.fill = 'green';_x000D_
        text2.style.fontFamily = 'Calibri';_x000D_
        text2.style.fontSize = '35';_x000D_
        text2.style.fontStyle = 'italic';_x000D_
        text2.innerHTML = "Some italic line";_x000D_
_x000D_
       _x000D_
        svg.appendChild(text2);_x000D_
_x000D_
        var text3 = document.createElementNS('http://www.w3.org/2000/svg', 'text');_x000D_
        text3.setAttribute('x', 20);_x000D_
        text3.setAttribute('y', 150);_x000D_
        text3.setAttribute('width', 500);_x000D_
        text3.style.fill = 'green';_x000D_
        text3.style.fontFamily = 'Calibri';_x000D_
        text3.style.fontSize = '35';_x000D_
        text3.style.fontWeight = 700;_x000D_
        text3.innerHTML = "Some bold line";_x000D_
_x000D_
       _x000D_
        svg.appendChild(text3);

_x000D_

    <svg width="510" height="250" xmlns="http://www.w3.org/2000/svg">_x000D_
        <rect x="0" y="0" width="510" height="250" fill="aquamarine" />_x000D_
    </svg>

_x000D_

Finding out current index in EACH loop (Ruby)

X.each_with_index do |item, index|
  puts "current_index: #{index}"
end

Change the current directory from a Bash script

I like to do the same thing for different projects without firing up a new shell.

In your case:

cd /home/artemb

Save the_script as:

echo cd /home/artemb

Then fire it up with:

\`./the_script\`

Then you get to the directory using the same shell.

What causes "Unable to access jarfile" error?

[Possibly Windows only]

Beware of spaces in the path, even when your jar is in the current working directory. For example, for me this was failing:

java -jar myjar.jar

I was able to fix this by givng the full, quoted path to the jar:

java -jar "%~dp0\myjar.jar"

Credit goes to this answer for setting me on the right path....

Class 'DOMDocument' not found

PHP8: (latest version)

sudo apt-get install php8.0-xml

PHP7:

sudo apt-get install php7.1-xml

You can also do:

sudo apt-get install php-dom

and apt-get will show you where it is.

set initial viewcontroller in appdelegate - swift

Swift 5 & Xcode 11

So in xCode 11 the window solution is no longer valid inside of appDelegate. They moved this to the SceneDelgate. You can find this in the SceneDelgate.swift file.

You will notice it now has a var window: UIWindow? present.

In my situation I was using a TabBarController from a storyboard and wanted to set it as the rootViewController.

This is my code:

sceneDelegate.swift

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).

        self.window = self.window ?? UIWindow()//@JA- If this scene's self.window is nil then set a new UIWindow object to it.

        //@Grab the storyboard and ensure that the tab bar controller is reinstantiated with the details below.
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let tabBarController = storyboard.instantiateViewController(withIdentifier: "tabBarController") as! UITabBarController

        for child in tabBarController.viewControllers ?? [] {
            if let top = child as? StateControllerProtocol {
                print("State Controller Passed To:")
                print(child.title!)
                top.setState(state: stateController)
            }
        }

        self.window!.rootViewController = tabBarController //Set the rootViewController to our modified version with the StateController instances
        self.window!.makeKeyAndVisible()

        print("Finished scene setting code")
        guard let _ = (scene as? UIWindowScene) else { return }
    }

Make sure to add this to the correct scene method as I did here. Note that you will need to set the identifier name for the tabBarController or viewController you are using in the storyboard.

In my case I was doing this to set a stateController to keep track of shared variables amongst the tab views. If you wish to do this same thing add the following code...

StateController.swift

import Foundation

struct tdfvars{
    var rbe:Double = 1.4
    var t1half:Double = 1.5
    var alphaBetaLate:Double = 3.0
    var alphaBetaAcute:Double = 10.0
    var totalDose:Double = 6000.00
    var dosePerFraction:Double = 200.0
    var numOfFractions:Double = 30
    var totalTime:Double = 168
    var ldrDose:Double = 8500.0
}

//@JA - Protocol that view controllers should have that defines that it should have a function to setState
protocol StateControllerProtocol {
  func setState(state: StateController)
}

class StateController {
    var tdfvariables:tdfvars = tdfvars()
}

Note: Just use your own variables or whatever you are trying to keep track of instead, I just listed mine as an example in tdfvariables struct.

In each view of the TabController add the following member variable.

    class SettingsViewController: UIViewController {
    var stateController: StateController?
.... }

Then in those same files add the following:

extension SettingsViewController: StateControllerProtocol {
  func setState(state: StateController) {
    self.stateController = state
  }
}

What this does is allows you to avoid the singleton approach to passing variables between the views. This allows easily for the dependency injection model which is much better long run then the singleton approach.

Why does my sorting loop seem to append an element where it shouldn't?

Apart from the alternative solutions that were posted here (which are correct), no one has actually answered your question by addressing what was wrong with your code.

It seems as though you were trying to implement a selection sort algorithm. I will not go into the details of how sorting works here, but I have included a few links for your reference =)

Your code was syntactically correct, but logically wrong. You were partially sorting your strings by only comparing each string with the strings that came after it. Here is a corrected version (I retained as much of your original code to illustrate what was "wrong" with it):

static  String Array[]={" Hello " , " This " , "is ", "Sorting ", "Example"};
String  temp;

//Keeps track of the smallest string's index
int  shortestStringIndex; 

public static void main(String[] args)  
{              

 //I reduced the upper bound from Array.length to (Array.length - 1)
 for(int j=0; j < Array.length - 1;j++)
 {
     shortestStringIndex = j;

     for (int i=j+1 ; i<Array.length; i++)
     {
         //We keep track of the index to the smallest string
         if(Array[i].trim().compareTo(Array[shortestStringIndex].trim())<0)
         {
             shortestStringIndex = i;  
         }
     }
     //We only swap with the smallest string
     if(shortestStringIndex != j)
     {
         String temp = Array[j];
         Array[j] = Array[shortestStringIndex]; 
         Array[shortestStringIndex] = temp;
     }
 }
}

Further Reading

The problem with this approach is that its asymptotic complexity is O(n^2). In simplified words, it gets very slow as the size of the array grows (approaches infinity). You may want to read about better ways to sort data, such as quicksort.

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

I was having similar problem. It was just inserting one from the list of arrays. It worked after making the below changes.

Passed [params] to the query method.
Changed the query from insert (a,b) into table1 values (?) ==> insert (a,b) into table1 values ? . ie. Removed the paranthesis around the question mark.

Hope this helps. I am using mysql npm.

pgadmin4 : postgresql application server could not be contacted.

I found the same issue when upgrading to pgAdmin 4 (v1.6). On Windows I found that clearing out the C:\Users\%USERNAME%\AppData\Roaming\pgAdmin folder fixed the issue for me. I believe it was attempting to use the sessions from the prior version and was failing. I know the question was marked as answered, but downgrading may not always be an option.

Note: AppData\Roaming\pgAdmin is a hidden folder.

Difference between Math.Floor() and Math.Truncate()

Math.Floor() rounds toward negative infinity

Math.Truncate rounds up or down towards zero.

For example:

Math.Floor(-3.4)     = -4
Math.Truncate(-3.4)  = -3

while

Math.Floor(3.4)     = 3
Math.Truncate(3.4)  = 3

Case insensitive 'Contains(string)'

You could use the String.IndexOf Method and pass StringComparison.OrdinalIgnoreCase as the type of search to use:

string title = "STRING";
bool contains = title.IndexOf("string", StringComparison.OrdinalIgnoreCase) >= 0;

Even better is defining a new extension method for string:

public static class StringExtensions
{
    public static bool Contains(this string source, string toCheck, StringComparison comp)
    {
        return source?.IndexOf(toCheck, comp) >= 0;
    }
}

Note, that null propagation ?. is available since C# 6.0 (VS 2015), for older versions use

if (source == null) return false;
return source.IndexOf(toCheck, comp) >= 0;

USAGE:

string title = "STRING";
bool contains = title.Contains("string", StringComparison.OrdinalIgnoreCase);

What is the difference between bottom-up and top-down?

Dynamic Programming is often called Memoization!

1.Memoization is the top-down technique(start solving the given problem by breaking it down) and dynamic programming is a bottom-up technique(start solving from the trivial sub-problem, up towards the given problem)

2.DP finds the solution by starting from the base case(s) and works its way upwards. DP solves all the sub-problems, because it does it bottom-up

Unlike Memoization, which solves only the needed sub-problems

DP has the potential to transform exponential-time brute-force solutions into polynomial-time algorithms.
DP may be much more efficient because its iterative

On the contrary, Memoization must pay for the (often significant) overhead due to recursion.

To be more simple, Memoization uses the top-down approach to solve the problem i.e. it begin with core(main) problem then breaks it into sub-problems and solve these sub-problems similarly. In this approach same sub-problem can occur multiple times and consume more CPU cycle, hence increase the time complexity. Whereas in Dynamic programming same sub-problem will not be solved multiple times but the prior result will be used to optimize the solution.

How to get first N elements of a list in C#?

In case anyone is interested (even if the question does not ask for this version), in C# 2 would be: (I have edited the answer, following some suggestions)

myList.Sort(CLASS_FOR_COMPARER);
List<string> fiveElements = myList.GetRange(0, 5);

What is the difference between Visual Studio Express 2013 for Windows and Visual Studio Express 2013 for Windows Desktop?

A comparison between the different Visual Studio Express editions can be found at Visual Studio Express (archive.org link). The difference between Windows and Windows Desktop is that with the Windows edition you can build Windows Store Apps (using .NET, WPF/XAML) while the Windows Desktop edition allows you to write classic Windows Desktop applications. It is possible to install both products on the same machine.

Visual Studio Express 2010 allows you to build Windows Desktop applications. Writing Windows Store applications is not possible with this product.

For learning I would suggest Notepad and the command line. While an IDE provides significant productivity enhancements to professionals, it can be intimidating to a beginner. If you want to use an IDE nevertheless I would recommend Visual Studio Express 2013 for Windows Desktop.

Update 2015-07-27: In addition to the Express Editions, Microsoft now offers Community Editions. These are still free for individual developers, open source contributors, and small teams. There are no Web, Windows, and Windows Desktop releases anymore either; the Community Edition can be used to develop any app type. In addition, the Community Edition does support (3rd party) Add-ins. The Community Edition offers the same functionality as the commercial Professional Edition.

Creating a class object in c++

There is two ways to make/create object in c++.

First one is :

MyClass myclass; // if you don;t need to call rather than default constructor    
MyClass myclass(12); // if you need to call constructor with parameters

Second one is :

MyClass *myclass = new MyClass();// if you don;t need to call rather than default constructor
MyClass *myclass = new MyClass(12);// if you need to call constructor with parameters

In c++ if you use new keyword, object will be stored in heap. it;s very useful if you are using this object long time of period and if you use first method, it will be stored in stack. it can be used only short time period. Notice : if you use new keyword, remember it will return pointer value. you should declare name with *. If you use second method, it doesn;t delete object in the heap. you must delete by yourself using delete keyword;

delete myclass;

How to unescape a Java string literal in Java?

For the record, if you use Scala, you can do:

StringContext.treatEscapes(escaped)

Deleting multiple columns based on column names in Pandas

My personal favorite, and easier than the answers I have seen here (for multiple columns):

df.drop(df.columns[22:56], axis=1, inplace=True)

How to block until an event is fired in c#

If you're happy to use the Microsoft Reactive Extensions, then this can work nicely:

public class Foo
{
    public delegate void MyEventHandler(object source, MessageEventArgs args);
    public event MyEventHandler _event;
    public string ReadLine()
    {
        return Observable
            .FromEventPattern<MyEventHandler, MessageEventArgs>(
                h => this._event += h,
                h => this._event -= h)
            .Select(ep => ep.EventArgs.Message)
            .First();
    }
    public void SendLine(string message)
    {
        _event(this, new MessageEventArgs() { Message = message });
    }
}

public class MessageEventArgs : EventArgs
{
    public string Message;
}

I can use it like this:

var foo = new Foo();

ThreadPoolScheduler.Instance
    .Schedule(
        TimeSpan.FromSeconds(5.0),
        () => foo.SendLine("Bar!"));

var resp = foo.ReadLine();

Console.WriteLine(resp);

I needed to call the SendLine message on a different thread to avoid locking, but this code shows that it works as expected.

Stripping everything but alphanumeric chars from a string in Python

As a spin off from some other answers here, I offer a really simple and flexible way to define a set of characters that you want to limit a string's content to. In this case, I'm allowing alphanumerics PLUS dash and underscore. Just add or remove characters from my PERMITTED_CHARS as suits your use case.

PERMITTED_CHARS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-" 
someString = "".join(c for c in someString if c in PERMITTED_CHARS)

How to configure nginx to enable kinda 'file browser' mode?

1. List content of all directories

Set autoindex option to on. It is off by default.

Your configuration file ( vi /etc/nginx/sites-available/default ) should be like this

location /{ 
   ... ( some other lines )
   autoindex on;
   ... ( some other lines )
}

2. List content of only some specific directory

Set autoindex option to on. It is off by default.

Your configuration file ( vi /etc/nginx/sites-available/default )
should be like this.
change path_of_your_directory to your directory path

location /path_of_your_directory{ 
   ... ( some other lines )
   autoindex on;
   ... ( some other lines )
}

Hope it helps..

How to format numbers?

If you're using jQuery, you could use the format or number format plugins.

How to send email to multiple recipients using python smtplib?

The solution below worked for me. It successfully sends an email to multiple recipients, including "CC" and "BCC."

toaddr = ['mailid_1','mailid_2']
cc = ['mailid_3','mailid_4']
bcc = ['mailid_5','mailid_6']
subject = 'Email from Python Code'
fromaddr = 'sender_mailid'
message = "\n  !! Hello... !!"

msg['From'] = fromaddr
msg['To'] = ', '.join(toaddr)
msg['Cc'] = ', '.join(cc)
msg['Bcc'] = ', '.join(bcc)
msg['Subject'] = subject

s.sendmail(fromaddr, (toaddr+cc+bcc) , message)

How to close a Tkinter window by pressing a Button?

from tkinter import *

def close_window():
    import sys
    sys.exit()

root = Tk()

frame = Frame (root)
frame.pack()

button = Button (frame, text="Good-bye", command=close_window)
button.pack()

mainloop()

How do I return clean JSON from a WCF Service?

If you want nice json without hardcoding attributes into your service classes,

use <webHttp defaultOutgoingResponseFormat="Json"/> in your behavior config

Should I check in folder "node_modules" to Git when creating a Node.js app on Heroku?

I believe that npm install should not run in a production environment. There are several things that can go wrong - npm outage, download of newer dependencies (shrinkwrap seems to have solved this) are two of them.

On the other hand, folder node_modules should not be committed to Git. Apart from their big size, commits including them can become distracting.

The best solutions would be this: npm install should run in a CI environment that is similar to the production environment. All tests will run and a zipped release file will be created that will include all dependencies.

Trigger to fire only if a condition is met in SQL Server

CREATE TRIGGER
    [dbo].[SystemParameterInsertUpdate]
ON 
    [dbo].[SystemParameter]
FOR INSERT, UPDATE 
AS
  BEGIN
    SET NOCOUNT ON 

    DECLARE @StartRow int
    DECLARE @EndRow int
    DECLARE @CurrentRow int

    SET @StartRow = 1
    SET @EndRow = (SELECT count(*) FROM inserted)
    SET @CurrentRow = @StartRow

    WHILE @CurrentRow <= @EndRow BEGIN

        IF (SELECT Attribute FROM (SELECT ROW_NUMBER() OVER (ORDER BY Attribute ASC) AS 'RowNum', Attribute FROM inserted) AS INS WHERE RowNum = @CurrentRow) LIKE 'NoHist_%' BEGIN

            INSERT INTO SystemParameterHistory(
                Attribute,
                ParameterValue,
                ParameterDescription,
                ChangeDate)
            SELECT
                I.Attribute,
                I.ParameterValue,
                I.ParameterDescription,
                I.ChangeDate
            FROM
                (SELECT Attribute, ParameterValue, ParameterDescription, ChangeDate FROM (
                                                                                            SELECT ROW_NUMBER() OVER (ORDER BY Attribute ASC) AS 'RowNum', * 
                                                                                            FROM inserted)
                                                                                    AS I 
            WHERE RowNum = @CurrentRow

        END --END IF

    SET @CurrentRow = @CurrentRow + 1

    END --END WHILE
END --END TRIGGER

Using generic std::function objects with member functions in one class

A non-static member function must be called with an object. That is, it always implicitly passes "this" pointer as its argument.

Because your std::function signature specifies that your function doesn't take any arguments (<void(void)>), you must bind the first (and the only) argument.

std::function<void(void)> f = std::bind(&Foo::doSomething, this);

If you want to bind a function with parameters, you need to specify placeholders:

using namespace std::placeholders;
std::function<void(int,int)> f = std::bind(&Foo::doSomethingArgs, this, std::placeholders::_1, std::placeholders::_2);

Or, if your compiler supports C++11 lambdas:

std::function<void(int,int)> f = [=](int a, int b) {
    this->doSomethingArgs(a, b);
}

(I don't have a C++11 capable compiler at hand right now, so I can't check this one.)

Check for false

If you want it to check explicit for it to not be false (boolean value) you have to use

if(borrar() !== false)

But in JavaScript we usually use falsy and truthy and you could use

if(!borrar())

but then values 0, '', null, undefined, null and NaN would not generate the alert.

The following values are always falsy:

false,
,0 (zero)
,'' or "" (empty string)
,null
,undefined
,NaN

Everything else is truthy. That includes:

'0' (a string containing a single zero)
,'false' (a string containing the text “false”)
,[] (an empty array)
,{} (an empty object)
,function(){} (an “empty” function)

Source: https://www.sitepoint.com/javascript-truthy-falsy/

As an extra perk to convert any value to true or false (boolean type), use double exclamation mark:

!![] === true
!!'false' === true
!!false === false
!!undefined === false

jQuery If DIV Doesn't Have Class "x"

How about instead of using an if inside the event, you unbind the event when the select class is applied? I'm guessing you add the class inside your code somewhere, so unbinding the event there would look like this:

$(element).addClass( 'selected' ).unbind( 'hover' );

The only downside is that if you ever remove the selected class from the element, you have to subscribe it to the hover event again.

Convert a list to a data frame

Sometimes your data may be a list of lists of vectors of the same length.

lolov = list(list(c(1,2,3),c(4,5,6)), list(c(7,8,9),c(10,11,12),c(13,14,15)) )

(The inner vectors could also be lists, but I'm simplifying to make this easier to read).

Then you can make the following modification. Remember that you can unlist one level at a time:

lov = unlist(lolov, recursive = FALSE )
> lov
[[1]]
[1] 1 2 3

[[2]]
[1] 4 5 6

[[3]]
[1] 7 8 9

[[4]]
[1] 10 11 12

[[5]]
[1] 13 14 15

Now use your favorite method mentioned in the other answers:

library(plyr)
>ldply(lov)
  V1 V2 V3
1  1  2  3
2  4  5  6
3  7  8  9
4 10 11 12
5 13 14 15

How does a Linux/Unix Bash script know its own PID?

The variable '$$' contains the PID.

How to redirect verbose garbage collection output to a file?

If in addition you want to pipe the output to a separate file, you can do:

On a Sun JVM:

-Xloggc:C:\whereever\jvm.log -verbose:gc -XX:+PrintGCDateStamps

ON an IBM JVM:

-Xverbosegclog:C:\whereever\jvm.log

docker: executable file not found in $PATH

I had the same problem, After lots of googling, I couldn't find out how to fix it.

Suddenly I noticed my stupid mistake :)

As mentioned in the docs, the last part of docker run is the command you want to run and its arguments after loading up the container.

NOT THE CONTAINER NAME !!!

That was my embarrassing mistake.

Below I provided you with the picture of my command line to see what I have done wrong.

And this is the fix as mentioned in the docs.

High Quality Image Scaling Library

Use this library: http://imageresizing.net

Have a read of this article by the library author: 20 Image Sizing Pitfalls with .NET

SQL query to find record with ID not in another table

Fast Alternative

I ran some tests (on postgres 9.5) using two tables with ~2M rows each. This query below performed at least 5* better than the other queries proposed:

-- Count
SELECT count(*) FROM (
    (SELECT id FROM table1) EXCEPT (SELECT id FROM table2)
) t1_not_in_t2;

-- Get full row
SELECT table1.* FROM (
    (SELECT id FROM table1) EXCEPT (SELECT id FROM table2)
) t1_not_in_t2 JOIN table1 ON t1_not_in_t2.id=table1.id;

How can I get the corresponding table header (th) from a table cell (td)?

Find matching `th` for a `td`, taking into account `colspan` index issues.

_x000D_

$('table').on('click', 'td', get_TH_by_TD)_x000D_
_x000D_
function get_TH_by_TD(e){_x000D_
   var idx = $(this).index(),_x000D_
       th, th_colSpan = 0;_x000D_
_x000D_
   for( var i=0; i < this.offsetParent.tHead.rows[0].cells.length; i++ ){_x000D_
      th = this.offsetParent.tHead.rows[0].cells[i];_x000D_
      th_colSpan += th.colSpan;_x000D_
      if( th_colSpan >= (idx + this.colSpan) )_x000D_
        break;_x000D_
   }_x000D_
   _x000D_
   console.clear();_x000D_
   console.log( th );_x000D_
   return th;_x000D_
}

_x000D_

table{ width:100%; }_x000D_
th, td{ border:1px solid silver; padding:5px; }

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
<p>Click a TD:</p>_x000D_
<table>_x000D_
    <thead> _x000D_
        <tr>_x000D_
            <th colspan="2"></th>_x000D_
            <th>Name</th>_x000D_
            <th colspan="2">Address</th>_x000D_
            <th colspan="2">Other</th>_x000D_
        </tr>_x000D_
    </thead> _x000D_
    <tbody>_x000D_
        <tr>_x000D_
            <td>X</td>_x000D_
            <td>1</td>_x000D_
            <td>Jon Snow</td>_x000D_
            <td>12</td>_x000D_
            <td>High Street</td>_x000D_
            <td>Postfix</td>_x000D_
            <td>Public</td>_x000D_
        </tr>_x000D_
    </tbody>_x000D_
</table>

_x000D_

How I can get web page's content and save it into the string variable

I've run into issues with Webclient.Downloadstring before. If you do, you can try this:

WebRequest request = WebRequest.Create("http://www.google.com");
WebResponse response = request.GetResponse();
Stream data = response.GetResponseStream();
string html = String.Empty;
using (StreamReader sr = new StreamReader(data))
{
    html = sr.ReadToEnd();
}

Android Respond To URL in Intent

I did it! Using <intent-filter>. Put the following into your manifest file:

<intent-filter>
  <action android:name="android.intent.action.VIEW" />
  <category android:name="android.intent.category.DEFAULT" />
  <category android:name="android.intent.category.BROWSABLE" />
  <data android:host="www.youtube.com" android:scheme="http" />
</intent-filter>

This works perfectly!

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1

To make it clear, in addition to @SLaks' answer, that meant you need to change this line :

List<RootObject> datalist = JsonConvert.DeserializeObject<List<RootObject>>(jsonstring);

to something like this :

RootObject datalist = JsonConvert.DeserializeObject<RootObject>(jsonstring);

Div show/hide media query

 Small devices (landscape phones, 576px and up)
@media (min-width: 576px) { 
  #my-content{
   width:100%;
 }

// Medium devices (tablets, 768px and up)
@media (min-width: 768px) { 
  #my-content{
   width:100%;
 }
 }

// Large devices (desktops, 992px and up)
@media (min-width: 992px) { 
display: none;
 }

// Extra large devices (large desktops, 1200px and up)
@media (min-width: 1200px) {
// Havent code only get for more informations 
 }

Change background color of R plot

I use abline() with extremely wide vertical lines to fill the plot space:

abline(v = xpoints, col = "grey90", lwd = 80)

You have to create the frame, then the ablines, and then plot the points so they are visible on top. You can even use a second abline() statement to put thin white or black lines over the grey, if desired.

Example:

xpoints = 1:20
y = rnorm(20)
plot(NULL,ylim=c(-3,3),xlim=xpoints)
abline(v=xpoints,col="gray90",lwd=80)
abline(v=xpoints,col="white")
abline(h = 0, lty = 2) 
points(xpoints, y, pch = 16, cex = 1.2, col = "red")

Parsing JSON in Java without knowing JSON format

Would you be satisfied with a Map from Jackson?

ObjectMapper objectMapper = new ObjectMapper();
Map<String, Object> map = objectMapper.readValue(jsonString, new TypeReference<HashMap<String,Object>>(){});

Or maybe a JsonNode?

JsonNode jsonNode = objectMapper.readTree(String jsonString)

How to get next/previous record in MySQL?

CREATE PROCEDURE `pobierz_posty`(IN iduser bigint(20), IN size int, IN page int)
BEGIN
 DECLARE start_element int DEFAULT 0;
 SET start_element:= size * page;
 SELECT DISTINCT * FROM post WHERE id_users .... 
 ORDER BY data_postu DESC LIMIT size OFFSET start_element
END

Recover unsaved SQL query scripts

You can find files here, when you closed SSMS window accidentally

C:\Windows\System32\SQL Server Management Studio\Backup Files\Solution1

Compiling dynamic HTML strings from database

Found in a google discussion group. Works for me.

var $injector = angular.injector(['ng', 'myApp']);
$injector.invoke(function($rootScope, $compile) {
  $compile(element)($rootScope);
});

Python copy files to a new directory and rename if file name already exists

For me shutil.copy is the best:

import shutil

#make a copy of the invoice to work with
src="invoice.pdf"
dst="copied_invoice.pdf"
shutil.copy(src,dst)

You can change the path of the files as you want.

Python Pandas - Find difference between two data frames

For rows, try this, where Name is the joint index column (can be a list for multiple common columns, or specify left_on and right_on):

m = df1.merge(df2, on='Name', how='outer', suffixes=['', '_'], indicator=True)

The indicator=True setting is useful as it adds a column called _merge, with all changes between df1 and df2, categorized into 3 possible kinds: "left_only", "right_only" or "both".

For columns, try this:

set(df1.columns).symmetric_difference(df2.columns)

Prevent Caching in ASP.NET MVC for specific actions using an attribute

You can use the built in cache attribute to prevent caching.

For .net Framework: [OutputCache(NoStore = true, Duration = 0)]

For .net Core: [ResponseCache(NoStore = true, Duration = 0)]

Be aware that it is impossible to force the browser to disable caching. The best you can do is provide suggestions that most browsers will honor, usually in the form of headers or meta tags. This decorator attribute will disable server caching and also add this header: Cache-Control: public, no-store, max-age=0. It does not add meta tags. If desired, those can be added manually in the view.

Additionally, JQuery and other client frameworks will attempt to trick the browser into not using it's cached version of a resource by adding stuff to the url, like a timestamp or GUID. This is effective in making the browser ask for the resource again but doesn't really prevent caching.

On a final note. You should be aware that resources can also be cached in between the server and client. ISP's, proxies, and other network devices also cache resources and they often use internal rules without looking at the actual resource. There isn't much you can do about these. The good news is that they typically cache for shorter time frames, like seconds or minutes.

MySQL Multiple Joins in one query?

You can simply add another join like this:

SELECT dashboard_data.headline, dashboard_data.message, dashboard_messages.image_id, images.filename
FROM dashboard_data 
    INNER JOIN dashboard_messages 
        ON dashboard_message_id = dashboard_messages.id
    INNER JOIN images
        ON dashboard_messages.image_id = images.image_id

However be aware that, because it is an INNER JOIN, if you have a message without an image, the entire row will be skipped. If this is a possibility, you may want to do a LEFT OUTER JOIN which will return all your dashboard messages and an image_filename only if one exists (otherwise you'll get a null)

SELECT dashboard_data.headline, dashboard_data.message, dashboard_messages.image_id, images.filename
FROM dashboard_data 
    INNER JOIN dashboard_messages 
        ON dashboard_message_id = dashboard_messages.id
    LEFT OUTER JOIN images
        ON dashboard_messages.image_id = images.image_id

Filter Pyspark dataframe column with None value

None/Null is a data type of the class NoneType in pyspark/python so, Below will not work as you are trying to compare NoneType object with string object

Wrong way of filreting

df[df.dt_mvmt == None].count() 0 df[df.dt_mvmt != None].count() 0

correct

df=df.where(col("dt_mvmt").isNotNull()) returns all records with dt_mvmt as None/Null

Can you do greater than comparison on a date in a Rails 3 search?

Rails 6.1 added a new 'syntax' for comparison operators in where conditions, for example:

Post.where('id >': 9)
Post.where('id >=': 9)
Post.where('id <': 3)
Post.where('id <=': 3)

So your query can be rewritten as follows:

Note
  .where(user_id: current_user.id, notetype: p[:note_type], 'date >', p[:date])
  .order(date: :asc, created_at: :asc)

Here is a link to PR where you can find more examples.

What is a Python equivalent of PHP's var_dump()?

I don't have PHP experience, but I have an understanding of the Python standard library.

For your purposes, Python has several methods:

logging module;

Object serialization module which is called pickle. You may write your own wrapper of the pickle module.

If your using var_dump for testing, Python has its own doctest and unittest modules. It's very simple and fast for design.

how to destroy an object in java?

Short Answer - E

Answer isE given that the rest are plainly wrong, but ..

Long Answer - It isn't that simple; it depends ...

Simple fact is, the garbage collector may never decide to garbage collection every single object that is a viable candidate for collection, not unless memory pressure is extremely high. And then there is the fact that Java is just as susceptible to memory leaks as any other language, they are just harder to cause, and thus harder to find when you do cause them!

The following article has many good details on how memory management works and doesn't work and what gets take up by what. How generational Garbage Collectors work and Thanks for the Memory ( Understanding How the JVM uses Native Memory on Windows and Linux )

If you read the links, I think you will get the idea that memory management in Java isn't as simple as a multiple choice question.

Javascript: console.log to html

A little late to the party, but I took @Hristiyan Dodov's answer a bit further still.

All console methods are now rewired and in case of overflowing text, an optional autoscroll to bottom is included. Colors are now based on the logging method rather than the arguments.

_x000D_

rewireLoggingToElement(_x000D_
    () => document.getElementById("log"),_x000D_
    () => document.getElementById("log-container"), true);_x000D_
_x000D_
function rewireLoggingToElement(eleLocator, eleOverflowLocator, autoScroll) {_x000D_
    fixLoggingFunc('log');_x000D_
    fixLoggingFunc('debug');_x000D_
    fixLoggingFunc('warn');_x000D_
    fixLoggingFunc('error');_x000D_
    fixLoggingFunc('info');_x000D_
_x000D_
    function fixLoggingFunc(name) {_x000D_
        console['old' + name] = console[name];_x000D_
        console[name] = function(...arguments) {_x000D_
            const output = produceOutput(name, arguments);_x000D_
            const eleLog = eleLocator();_x000D_
_x000D_
            if (autoScroll) {_x000D_
                const eleContainerLog = eleOverflowLocator();_x000D_
                const isScrolledToBottom = eleContainerLog.scrollHeight - eleContainerLog.clientHeight <= eleContainerLog.scrollTop + 1;_x000D_
                eleLog.innerHTML += output + "<br>";_x000D_
                if (isScrolledToBottom) {_x000D_
                    eleContainerLog.scrollTop = eleContainerLog.scrollHeight - eleContainerLog.clientHeight;_x000D_
                }_x000D_
            } else {_x000D_
                eleLog.innerHTML += output + "<br>";_x000D_
            }_x000D_
_x000D_
            console['old' + name].apply(undefined, arguments);_x000D_
        };_x000D_
    }_x000D_
_x000D_
    function produceOutput(name, args) {_x000D_
        return args.reduce((output, arg) => {_x000D_
            return output +_x000D_
                "<span class=\"log-" + (typeof arg) + " log-" + name + "\">" +_x000D_
                    (typeof arg === "object" && (JSON || {}).stringify ? JSON.stringify(arg) : arg) +_x000D_
                "</span>&nbsp;";_x000D_
        }, '');_x000D_
    }_x000D_
}_x000D_
_x000D_
_x000D_
setInterval(() => {_x000D_
  const method = (['log', 'debug', 'warn', 'error', 'info'][Math.floor(Math.random() * 5)]);_x000D_
  console[method](method, 'logging something...');_x000D_
}, 200);

_x000D_

#log-container { overflow: auto; height: 150px; }_x000D_
_x000D_
.log-warn { color: orange }_x000D_
.log-error { color: red }_x000D_
.log-info { color: skyblue }_x000D_
.log-log { color: silver }_x000D_
_x000D_
.log-warn, .log-error { font-weight: bold; }

_x000D_

<div id="log-container">_x000D_
  <pre id="log"></pre>_x000D_
</div>

_x000D_

How do I remove the first characters of a specific column in a table?

Here's a simple mock-up of what you're trying to do :)

CREATE TABLE Codes
(
code1 varchar(10),
code2 varchar(10)
)

INSERT INTO Codes (CODE1, CODE2) vALUES ('ABCD1234','')


UPDATE Codes
SET code2 = SUBSTRING(Code1, 5, LEN(CODE1) -4)

So, use the last statement against the field you want to trim :)

The SUBSTRING function trims down Code1, starting at the FIFTH character, and continuing for the length of CODE1 less 4 (the number of characters skipped at the start).

Parse JSON from JQuery.ajax success data

One of the way you can ensure that this type of mistake (using string instead of json) doesn't happen is to see what gets printed in the alert. When you do

alert(data)

if data is a string, it will print everything that is contains. However if you print is json object. you will get the following response in the alert

[object Object]

If this the response then you can be sure that you can use this as an object (json in this case).

Thus, you need to convert your string into json first, before using it by doing this:

JSON.parse(data)

SSL Error: CERT_UNTRUSTED while using npm command

I think I got the reason for the above error. It is the corporate proxy(virtual private network) provided in order to work in the client network. Without that connection I frequently faced the same problem be it maven build or npm install.

How to pass parameters to $http in angularjs?

Build URL '/search' as string. Like

"/search?fname="+fname"+"&lname="+lname

Actually I didn't use

 `$http({method:'GET', url:'/search', params:{fname: fname, lname: lname}})`

but I'm sure "params" should be JSON.stringify like for POST

var jsonData = JSON.stringify(
    {
        fname: fname,
        lname: lname 
    }
);

After:

$http({
  method:'GET',
  url:'/search',
  params: jsonData
});

Vue.js—Difference between v-model and v-bind

v-model
it is two way data binding, it is used to bind html input element when you change input value then bounded data will be change.

v-model is used only for HTML input elements

ex: <input type="text" v-model="name" >

v-bind
it is one way data binding,means you can only bind data to input element but can't change bounded data changing input element. v-bind is used to bind html attribute
ex:
<input type="text" v-bind:class="abc" v-bind:value="">

<a v-bind:href="home/abc" > click me </a>

VIM Disable Automatic Newline At End Of File

I found this vimscript plugin is helpful for this situation.

Plugin 'vim-scripts/PreserveNoEOL'

Or read more at github

Ruby max integer

There is no maximum since Ruby 2.4, as Bignum and Fixnum got unified into Integer. see Feature #12005

> (2 << 1000).is_a? Fixnum
(irb):322: warning: constant ::Fixnum is deprecated
=> true

> 1.is_a? Bignum
(irb):314: warning: constant ::Bignum is deprecated
=> true

> (2 << 1000).class
=> Integer

There won't be any overflow, what would happen is an out of memory.

C# function to return array

return Labels; should do the trick!

public static ArtworkData[] GetDataRecords(int UsersID)
{
    ArtworkData[] Labels;
    Labels = new ArtworkData[3];

    return Labels;
}

What is a reasonable length limit on person "Name" fields?

In the UK, there are a few government standards which deal successfully with the bulk of the UK population -- the Passport Office, the Driver & Vehicle Licensing Agency, the Deed Poll office, and the NHS. They use different standards, obviously.

Changing your name by Deed Poll allows 300 characters;

There is no legal limit on the length of your name, but we impose a limit of 300 characters (including spaces) for your full name.

The NHS uses 70 characters for patient names

PATIENT NAME
Format/length: max an70

The Passport Office allows 30+30 first/last and Driving Licenses (DVLA) is 30 total.

Note that other organisations will have their own restrictions about what they will show on the documents they produce — for HM Passport Office the limit is 30 characters each for your forename and your surname, and for the DVLA the limit is 30 characters in total for your full name.

Objective-C Static Class Level variables

Another possibility would be to have a little NSNumber subclass singleton.

How do I POST JSON data with cURL?

This worked for me:

curl -H "Content-Type: application/json" -X POST -d @./my_json_body.txt http://192.168.1.1/json

Adding external resources (CSS/JavaScript/images etc) in JSP

The reason that you get the 404 File Not Found error, is that your path to CSS given as a value to the href attribute is missing context path.

An HTTP request URL contains the following parts:

http://[host]:[port][request-path]?[query-string]

The request path is further composed of the following elements:

Context path: A concatenation of a forward slash (/) with the context root of the servlet's web application. Example: http://host[:port]/context-root[/url-pattern]
Servlet path: The path section that corresponds to the component alias that activated this request. This path starts with a forward slash (/).
Path info: The part of the request path that is not part of the context path or the servlet path.

Solutions

There are several solutions to your problem, here are some of them:

1) Using `<c:url>` tag from JSTL

In my Java web applications I usually used <c:url> tag from JSTL when defining the path to CSS/JavaScript/image and other static resources. By doing so you can be sure that those resources are referenced always relative to the application context (context path).

If you say, that your CSS is located inside WebContent folder, then this should work:

<link type="text/css" rel="stylesheet" href="<c:url value="/globalCSS.css" />" />

The reason why it works is explained in the "JavaServer Pages™ Standard Tag Library" version 1.2 specification chapter 7.5 (emphasis mine):

7.5 <c:url>
Builds a URL with the proper rewriting rules applied.
...
The URL must be either an absolute URL starting with a scheme (e.g. "http:// server/context/page.jsp") or a relative URL as defined by JSP 1.2 in JSP.2.2.1 "Relative URL Specification". As a consequence, an implementation must prepend the context path to a URL that starts with a slash (e.g. "/page2.jsp") so that such URLs can be properly interpreted by a client browser.

NOTE
Don't forget to use Taglib directive in your JSP to be able to reference JSTL tags. Also see an example JSP page here.

2) Using JSP Expression Language and implicit objects

An alternative solution is using Expression Language (EL) to add application context:

<link type="text/css" rel="stylesheet" href="${pageContext.request.contextPath}/globalCSS.css" />

Here we have retrieved the context path from the request object. And to access the request object we have used the pageContext implicit object.

3) Using `<c:set>` tag from JSTL

DISCLAIMER
The idea of this solution was taken from here.

To make accessing the context path more compact than in the solution ?2, you can first use the JSTL <c:set> tag, that sets the value of an EL variable or the property of an EL variable in any of the JSP scopes (page, request, session, or application) for later access.

<c:set var="root" value="${pageContext.request.contextPath}"/>
...
<link type="text/css" rel="stylesheet" href="${root}/globalCSS.css" />

IMPORTANT NOTE
By default, in order to set the variable in such manner, the JSP that contains this set tag must be accessed at least once (including in case of setting the value in the application scope using scope attribute, like <c:set var="foo" value="bar" scope="application" />), before using this new variable. For instance, you can have several JSP files where you need this variable. So you must ether a) both set the new variable holding context path in the application scope AND access this JSP first, before using this variable in other JSP files, or b) set this context path holding variable in EVERY JSP file, where you need to access to it.

4) Using ServletContextListener

The more effective way to make accessing the context path more compact is to set a variable that will hold the context path and store it in the application scope using a Listener. This solution is similar to solution ?3, but the benefit is that now the variable holding context path is set right at the start of the web application and is available application wide, no need for additional steps.

We need a class that implements ServletContextListener interface. Here is an example of such class:

package com.example.listener;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

@WebListener
public class AppContextListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent event) {
        ServletContext sc = event.getServletContext();
        sc.setAttribute("ctx", sc.getContextPath());
    }

    @Override
    public void contextDestroyed(ServletContextEvent event) {}

}

Now in a JSP we can access this global variable using EL:

<link type="text/css" rel="stylesheet" href="${ctx}/globalCSS.css" />

NOTE
@WebListener annotation is available since Servlet version 3.0. If you use a servlet container or application server that supports older Servlet specifications, remove the @WebServlet annotation and instead configure the listener in the deployment descriptor (web.xml). Here is an example of web.xml file for the container that supports maximum Servlet version 2.5 (other configurations are omitted for the sake of brevity):

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">
    ...  
    <listener>
        <listener-class>com.example.listener.AppContextListener</listener-class>
    </listener>
    ...
</webapp>

5) Using scriptlets

As suggested by user @gavenkoa you can also use scriptlets like this:

<%= request.getContextPath() %>

For such a small thing it is probably OK, just note that generally the use of scriptlets in JSP is discouraged.

Conclusion

I personally prefer either the first solution (used it in my previous projects most of the time) or the second, as they are most clear, intuitive and unambiguous (IMHO). But you choose whatever suits you most.

Other thoughts

You can deploy your web app as the default application (i.e. in the default root context), so it can be accessed without specifying context path. For more info read the "Update" section here.

Create a custom callback in JavaScript

Try:

function LoadData (callback)
{
    // ... Process whatever data
    callback (loadedData, currentObject);
}

Functions are first class in JavaScript; you can just pass them around.

How to get pip to work behind a proxy server

Old thread, I know, but for future reference, the --proxy option is now passed with an "="

Example:

$ sudo pip install --proxy=http://yourproxy:yourport package_name

Converting NumPy array into Python List structure?

Use tolist():

import numpy as np
>>> np.array([[1,2,3],[4,5,6]]).tolist()
[[1, 2, 3], [4, 5, 6]]

Note that this converts the values from whatever numpy type they may have (e.g. np.int32 or np.float32) to the "nearest compatible Python type" (in a list). If you want to preserve the numpy data types, you could call list() on your array instead, and you'll end up with a list of numpy scalars. (Thanks to Mr_and_Mrs_D for pointing that out in a comment.)

Changing the page title with Jquery

Html code:

Change Title:
<input type="text" id="changeTitle" placeholder="Enter title tag">
<button id="changeTitle1">Click!</button>

Jquery code:

$(document).ready(function(){   
    $("#changeTitle1").click(function() {
        $(document).prop('title',$("#changeTitle").val()); 
    });
});

java build path problems

To configure your JRE in eclipse:

Window > Preferences > Java > Installed JREs...
Click Add
Find the directory of your JDK > Click OK

How to declare a variable in a template in Angular

Here is a directive I wrote that expands on the use of the exportAs decorator parameter, and allows you to use a dictionary as a local variable.

import { Directive, Input } from "@angular/core";
@Directive({
    selector:"[localVariables]",
    exportAs:"localVariables"
})
export class LocalVariables {
    @Input("localVariables") set localVariables( struct: any ) {
        if ( typeof struct === "object" ) {
            for( var variableName in struct ) {
                this[variableName] = struct[variableName];
            }
        }
    }
    constructor( ) {
    }
}

You can use it as follows in a template:

<div #local="localVariables" [localVariables]="{a: 1, b: 2, c: 3+2}">
   <span>a = {{local.a}}</span>
   <span>b = {{local.b}}</span>
   <span>c = {{local.c}}</span>
</div>

Of course #local can be any valid local variable name.

How to POST JSON Data With PHP cURL?

Try like this:

$url = 'url_to_post';
// this is only part of the data you need to sen
$customer_data = array("first_name" => "First name","last_name" => "last name","email"=>"[email protected]","addresses" => array ("address1" => "some address" ,"city" => "city","country" => "CA", "first_name" =>  "Mother","last_name" =>  "Lastnameson","phone" => "555-1212", "province" => "ON", "zip" => "123 ABC" ) );
// As per your API, the customer data should be structured this way
$data = array("customer" => $customer_data);
// And then encoded as a json string
$data_string = json_encode($data);
$ch=curl_init($url);

curl_setopt_array($ch, array(
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => $data_string,
    CURLOPT_HEADER => true,
    CURLOPT_HTTPHEADER => array('Content-Type:application/json', 'Content-Length: ' . strlen($data_string)))
));

$result = curl_exec($ch);
curl_close($ch);

The key thing you've forgotten was to json_encode your data. But you also may find it convenient to use curl_setopt_array to set all curl options at once by passing an array.

Programs & Examples On #Session set save handler

How to submit an HTML form on loading the page?

How to generate a git patch for a specific commit?

Convert HTML Character Back to Text Using Java Standard Library

Viewing full version tree in git

How to set iframe size dynamically

How to write to a file without overwriting current contents?

How to send PUT, DELETE HTTP request in HttpURLConnection?

My Application Could not open ServletContext resource

What is a segmentation fault?

How do I make a file:// hyperlink that works in both IE and Firefox?

Method call if not null in C#

Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly

Modifying the "Path to executable" of a windows service

CSS text-decoration underline color

nginx server_name wildcard or catch-all

How to check for valid email address?

Javascript to set hidden form value on drop down change

No resource identifier found for attribute '...' in package 'com.app....'

Set a cookie to HttpOnly via Javascript

How get all values in a column using PHP?

Testing web application on Mac/Safari when I don't own a Mac

How to implement a binary search tree in Python?

Gradient borders

Use string in switch case in java

How to store command results in a shell variable?

Select rows having 2 columns equal value

Call function with setInterval in jQuery?

How can I check Drupal log files?

How to model type-safe enum types?

Passing a callback function to another class

How to delete zero components in a vector in Matlab?

libxml/tree.h no such file or directory

Best programming based games

Select current date by default in ASP.Net Calendar control

Late binding

Code behind way (Page_Load solution)

How to make Bootstrap 4 cards the same height in card-columns?

Using "If cell contains #N/A" as a formula condition.

java.util.Date vs java.sql.Date

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

DISABLE the Horizontal Scroll

jquery function val() is not equivalent to "$(this).value="?

????? INVERSE :

Enjoy now : $('#myDiv').value

How can I dynamically switch web service addresses in .NET without a recompile?

Are complex expressions possible in ng-hide / ng-show?

How to convert QString to int?

The transaction manager has disabled its support for remote/network transactions

Add a thousands separator to a total with Javascript or jQuery?

Send raw ZPL to Zebra printer via USB

How to send POST request?

Getting the URL of the current page using Selenium WebDriver

Django -- Template tag in {% if %} block

How to return an array from a function?

Can I underline text in an Android layout?

One line solution

How to stop/terminate a python script from running?

SQL Server 2008: How to query all databases sizes?

Remove characters from a string

Plotting lines connecting points

Using setImageDrawable dynamically to set image in an ImageView

In Python how should I test if a variable is None, True or False

How to have Java method return generic list of any type?

Android Gradle 5.0 Update:Cause: org.jetbrains.plugins.gradle.tooling.util

OpenSSL and error in reading openssl.conf file

Drop all data in a pandas dataframe

The mysqli extension is missing. Please check your PHP configuration

What is the string length of a GUID?

Unable to find velocity template resources

CodeIgniter - How to return Json response from controller

How to send a header using a HTTP request through a curl call?

Example:

How to show matplotlib plots in python

Get pixel's RGB using PIL

Outdated

Node update a specific package

How to compile a static library in Linux?

How to uninstall pip on OSX?

Port 80 is being used by SYSTEM (PID 4), what is that?

`?????` INVERSE :