Range with step of type float

Probably because you can't have part of an iterable. Also, floats are imprecise.

CSS : center form in page horizontally and vertically

If you want to do a horizontal centering, just put the form inside a DIV tag and apply align="center" attribute to it. So even if the form width is changed, your centering will remain the same.

<div align="center"><form id="form_login"><!--form content here--></form></div>

UPDATE

@G-Cyr is right. align="center" attribute is now obsolete. You can use text-align attribute for this as following.

<div style="text-align:center"><form id="form_login"><!--form content here--></form></div>

This will center all the content inside the parent DIV. An optional way is to use margin: auto CSS attribute with predefined widths and heights. Please follow the following thread for more information.

How to horizontally center a in another ?

Vertical centering is little difficult than that. To do that, you can do the following stuff.

html

<body>
<div id="parent">
    <form id="form_login">
     <!--form content here-->
    </form>
</div>
</body>

Css

#parent {
   display: table;
   width: 100%;
}
#form_login {
   display: table-cell;
   text-align: center;
   vertical-align: middle;
}

System.Net.WebException: The remote name could not be resolved:

It's probably caused by a local network connectivity issue (but also a DNS error is possible). Unfortunately HResult is generic, however you can determine the exact issue catching HttpRequestException and then inspecting InnerException: if it's a WebException then you can check the WebException.Status property, for example WebExceptionStatus.NameResolutionFailure should indicate a DNS resolution problem.

It may happen, there isn't much you can do.

What I'd suggest to always wrap that (network related) code in a loop with a try/catch block (as also suggested here for other fallible operations). Handle known exceptions, wait a little (say 1000 msec) and try again (for say 3 times). Only if failed all times then you can quit/report an error to your users. Very raw example like this:

private const int NumberOfRetries = 3;
private const int DelayOnRetry = 1000;

public static async Task<HttpResponseMessage> GetFromUrlAsync(string url) {
    using (var client = new HttpClient()) {
        for (int i=1; i <= NumberOfRetries; ++i) {
            try {
                return await client.GetAsync(url); 
            }
            catch (Exception e) when (i < NumberOfRetries) {
                await Task.Delay(DelayOnRetry);
            }
        }
    }
}

Representational state transfer (REST) and Simple Object Access Protocol (SOAP)

SOAPbased Web Services In short, the SOAPbased Services model views the world as an ecosystem of coequal peers that cannot control each other, but have to work together by honoring published contracts. It's a valid model of the messy real world, and the metadata based contracts form the SOAP Service Interface.

we can still associate SOAP with XMLbased Remote Procedure Calls, but SOAPbased Web Services technology has emerged into a flexible and powerful messaging model.

SOAP assumes all systems are independent and no system has any knowledge of the internals of another and internal functionality. The most such systems can do is send messages to one another and hope they will be acted upon. Systems publish contracts that they undertake to honor, and other systems rely upon these contracts to exchange messages with them.

Contracts between systems are collectively called metadata, and comprise service descriptions, the message exchange patterns supported and the policies governing qualities of service (a service may need to be encrypted, reliably delivered, etc.) A service description, in turn, is a detailed specification of the data (message documents) that will be sent and received by the system. The documents are described using an XML description language like XML Schema Definition. As long as all systems honor their published contracts, they can inter operate, and changes to the internals of systems never affect any other. Every system is responsible for translating its own internal implementations to and from its contracts

REST - REpresentational State Transfer. The physical protocol is HTTP. Basically, REST is that all distinct resources on the web that are uniquely identifiable by a URL. All operations that can be performed on these resources can be described by a limited set of verbs (the “CRUD” verbs) which in turn map to HTTP verbs.

REST's is much less “heavyweight” than SOAP.

Working of web service

Cross field validation with Hibernate Validator (JSR 303)

I have tried Alberthoven's example (hibernate-validator 4.0.2.GA) and i get an ValidationException: „Annotated methods must follow the JavaBeans naming convention. match() does not.“ too. After I renamed the method from „match“ to "isValid" it works.

public class Password {

    private String password;

    private String retypedPassword;

    public Password(String password, String retypedPassword) {
        super();
        this.password = password;
        this.retypedPassword = retypedPassword;
    }

    @AssertTrue(message="password should match retyped password")
    private boolean isValid(){
        if (password == null) {
            return retypedPassword == null;
        } else {
            return password.equals(retypedPassword);
        }
    }

    public String getPassword() {
        return password;
    }

    public String getRetypedPassword() {
        return retypedPassword;
    }

}

Connect to mysql on Amazon EC2 from a remote server

Solution to this is three steps:

Within MySQL my.ini/ my.cnf file change the bind-address to accept connection from all hosts (0.0.0.0).
Within aws console - ec2 - specific security group open your mysql port (default is 3306) to accept connections from all hosts (0.0.0.0).
Within windows firewall add the mysql port (default is 3306) to exceptions.

And this will start accepting remote connections.

Can you autoplay HTML5 videos on the iPad?

Just set

webView.mediaPlaybackRequiresUserAction = NO;

The autoplay works for me on iOS.

Find all files with name containing string

The -maxdepth option should be before the -name option, like below.,

find . -maxdepth 1 -name "string" -print

Simple http post example in Objective-C?

You can do using two options:

Using NSURLConnection:

NSURL* URL = [NSURL URLWithString:@"http://www.example.com/path"];
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:URL];
request.HTTPMethod = @"POST";
// Form URL-Encoded Body

NSDictionary* bodyParameters = @{
    @"username": @"reallyrambody",
    @"password": @"123456"
};
request.HTTPBody = [NSStringFromQueryParameters(bodyParameters) dataUsingEncoding:NSUTF8StringEncoding];

// Connection

NSURLConnection* connection = [NSURLConnection connectionWithRequest:request delegate:nil];
[connection start];

/*
 * Utils: Add this section before your class implementation
 */

/**
 This creates a new query parameters string from the given NSDictionary. For
 example, if the input is @{@"day":@"Tuesday", @"month":@"January"}, the output
 string will be @"day=Tuesday&month=January".
 @param queryParameters The input dictionary.
 @return The created parameters string.
*/
static NSString* NSStringFromQueryParameters(NSDictionary* queryParameters)
{
    NSMutableArray* parts = [NSMutableArray array];
    [queryParameters enumerateKeysAndObjectsUsingBlock:^(id key, id value, BOOL *stop) {
        NSString *part = [NSString stringWithFormat: @"%@=%@",
            [key stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding],
            [value stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]
        ];
        [parts addObject:part];
    }];
    return [parts componentsJoinedByString: @"&"];
}

/**
 Creates a new URL by adding the given query parameters.
 @param URL The input URL.
 @param queryParameters The query parameter dictionary to add.
 @return A new NSURL.
*/
static NSURL* NSURLByAppendingQueryParameters(NSURL* URL, NSDictionary* queryParameters)
{
    NSString* URLString = [NSString stringWithFormat:@"%@?%@",
        [URL absoluteString],
        NSStringFromQueryParameters(queryParameters)
    ];
    return [NSURL URLWithString:URLString];
}

Using NSURLSession

- (void)sendRequest:(id)sender
{
    /* Configure session, choose between:
       * defaultSessionConfiguration
       * ephemeralSessionConfiguration
       * backgroundSessionConfigurationWithIdentifier:
     And set session-wide properties, such as: HTTPAdditionalHeaders,
     HTTPCookieAcceptPolicy, requestCachePolicy or timeoutIntervalForRequest.
     */
    NSURLSessionConfiguration* sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];

    /* Create session, and optionally set a NSURLSessionDelegate. */
    NSURLSession* session = [NSURLSession sessionWithConfiguration:sessionConfig delegate:nil delegateQueue:nil];

    /* Create the Request:
       Token Duplicate (POST http://www.example.com/path)
     */

    NSURL* URL = [NSURL URLWithString:@"http://www.example.com/path"];
    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:URL];
    request.HTTPMethod = @"POST";

    // Form URL-Encoded Body

    NSDictionary* bodyParameters = @{
        @"username": @"reallyram",
        @"password": @"123456"
    };
    request.HTTPBody = [NSStringFromQueryParameters(bodyParameters) dataUsingEncoding:NSUTF8StringEncoding];

    /* Start a new Task */
    NSURLSessionDataTask* task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        if (error == nil) {
            // Success
            NSLog(@"URL Session Task Succeeded: HTTP %ld", ((NSHTTPURLResponse*)response).statusCode);
        }
        else {
            // Failure
            NSLog(@"URL Session Task Failed: %@", [error localizedDescription]);
        }
    }];
    [task resume];
}

/*
 * Utils: Add this section before your class implementation
 */

/**
 This creates a new query parameters string from the given NSDictionary. For
 example, if the input is @{@"day":@"Tuesday", @"month":@"January"}, the output
 string will be @"day=Tuesday&month=January".
 @param queryParameters The input dictionary.
 @return The created parameters string.
*/
static NSString* NSStringFromQueryParameters(NSDictionary* queryParameters)
{
    NSMutableArray* parts = [NSMutableArray array];
    [queryParameters enumerateKeysAndObjectsUsingBlock:^(id key, id value, BOOL *stop) {
        NSString *part = [NSString stringWithFormat: @"%@=%@",
            [key stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding],
            [value stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]
        ];
        [parts addObject:part];
    }];
    return [parts componentsJoinedByString: @"&"];
}

/**
 Creates a new URL by adding the given query parameters.
 @param URL The input URL.
 @param queryParameters The query parameter dictionary to add.
 @return A new NSURL.
*/
static NSURL* NSURLByAppendingQueryParameters(NSURL* URL, NSDictionary* queryParameters)
{
    NSString* URLString = [NSString stringWithFormat:@"%@?%@",
        [URL absoluteString],
        NSStringFromQueryParameters(queryParameters)
    ];
    return [NSURL URLWithString:URLString];
}

Joining two table entities in Spring Data JPA

This has been an old question but solution is very simple to that. If you are ever unsure about how to write criterias, joins etc in hibernate then best way is using native queries. This doesn't slow the performance and very useful. Eq. below

    @Query(nativeQuery = true, value = "your sql query")
returnTypeOfMethod methodName(arg1, arg2);

How to check if a textbox is empty using javascript

<pre><form name="myform"  method="post" enctype="multipart/form-data">
    <input type="text"   id="name"   name="name" /> 
<input type="submit"/>
</form></pre>

<script language="JavaScript" type="text/javascript">
 var frmvalidator  = new Validator("myform");
    frmvalidator.EnableFocusOnError(false); 
    frmvalidator.EnableMsgsTogether(); 
    frmvalidator.addValidation("name","req","Plese Enter Name"); 

</script>

Note: before using the code above you have to add the gen_validatorv31.js file.

Error in Eclipse: "The project cannot be built until build path errors are resolved"

Go to Project > Properties > Java Compiler > Building
Look under Build Path Problems
Un-check "Abort build when build path error occurs"
It won't solve all your errors but at least it will let you run your program :)

How to set "value" to input web element using selenium?

Use findElement instead of findElements

driver.findElement(By.xpath("//input[@id='invoice_supplier_id'])).sendKeys("your value");

driver.findElement(By.id("invoice_supplier_id")).sendKeys("value", "your value");

OR using JavascriptExecutor

WebElement element = driver.findElement(By.xpath("enter the xpath here")); // you can use any locator
 JavascriptExecutor jse = (JavascriptExecutor)driver;
 jse.executeScript("arguments[0].value='enter the value here';", element);

(JavascriptExecutor) driver.executeScript("document.evaluate(xpathExpresion, document, null, 9, null).singleNodeValue.innerHTML="+ DesiredText);

OR (in javascript)

driver.findElement(By.xpath("//input[@id='invoice_supplier_id'])).setAttribute("value", "your value")

Hope it will help you :)

How to get JavaScript variable value in PHP

If you want to use a js variable in a php script you MUST pass it within a HTTP request.

There are basically two ways:

Submitting or reloading the page (as per Chris answer).
Using AJAX, which is made exactly for communicating between a web page (js) and the server(php) without reloading/changing the page.

A basic example can be:

var profile_viewer_uid = 1;
$.ajax({
  url: "serverScript.php",
  method: "POST",
  data: { "profile_viewer_uid": profile_viewer_uid }
})

And in the serverScript.php file, you can do:

 $profile_viewer_uid = $_POST['profile_viewer_uid'];
 echo($profile_viewer_uid);
 // prints 1

Note: in this example I used jQuery AJAX, which is quicker to implement. You can do it in pure js as well.

How do I install opencv using pip?

As of OpenCV 2.2.0, the package name for the Python bindings is "cv".The old bindings named "opencv" are not maintained any longer. You might have to adjust your code.

The official OpenCV installer does not install the Python bindings into your Python directory. There should be a Python2.7 directory inside your OpenCV 2.2.0 installation directory. Copy the whole Lib folder from OpenCV\Python2.7\ to C:\Python27\ and make sure your OpenCV\bin directory is in the Windows DLL search path.

Alternatively use the opencv-python installers at http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv.

Or Simply install

sudo pip3 install opencv-python  #for python3

sudo pip install opencv-python   #for python2

What is the difference between Nexus and Maven?

This has a good general description: https://gephi.wordpress.com/tag/maven/

Let me make a few statement that can put the difference in focus:

We migrated our code base from Ant to Maven
All 3rd party librairies have been uploaded to Nexus. Maven is using Nexus as a source for libraries.
Basic functionalities of a repository manager like Sonatype are:
- Managing project dependencies,
- Artifacts & Metadata,
- Proxying external repositories
- and deployment of packaged binaries and JARs to share those artifacts with other developers and end-users.

Java JDBC connection status

Nothing. Just execute your query. If the connection has died, either your JDBC driver will reconnect (if it supports it, and you enabled it in your connection string--most don't support it) or else you'll get an exception.

If you check the connection is up, it might fall over before you actually execute your query, so you gain absolutely nothing by checking.

That said, a lot of connection pools validate a connection by doing something like SELECT 1 before handing connections out. But this is nothing more than just executing a query, so you might just as well execute your business query.

Why is Visual Studio 2010 not able to find/open PDB files?

I had the same problem. It turns out that, compiling a project I got from someone else, I haven't set the correct StartUp project (right click on the desired startup project in the solution explorer and pick "set as StartUp Project"). Maybe this will help, cheers.

Center the content inside a column in Bootstrap 4

_x000D_

.row>.col, .row>[class^=col-] {_x000D_
    padding-top: .75rem;_x000D_
    padding-bottom: .75rem;_x000D_
    background-color: rgba(86,61,124,.15);_x000D_
    border: 1px solid rgba(86,61,124,.2);_x000D_
}

_x000D_

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<div class="container">_x000D_
  <div class="row justify-content-md-center">_x000D_
    <div class="col col-lg-2">_x000D_
      1 of 3_x000D_
    </div>_x000D_
    <div class="col col-lg-2">_x000D_
      1 of 2_x000D_
    </div>_x000D_
    <div class="col col-lg-2">_x000D_
      3 of 3_x000D_
    </div>_x000D_
  </div>_x000D_
</div>

_x000D_

What's a .sh file?

Typically a .sh file is a shell script which you can execute in a terminal. Specifically, the script you mentioned is a bash script, which you can see if you open the file and look in the first line of the file, which is called the shebang or magic line.

Allowed memory size of 33554432 bytes exhausted (tried to allocate 43148176 bytes) in php

You can increase the memory allowed to php script by executing the following line above all the codes in the script:

ini_set('memory_limit','-1'); // enabled the full memory available.

And also de allocate the unwanted variables in the script.

Check this php library : Freeing memory with PHP

Sublime Text 3 how to change the font size of the file sidebar?

You need to change it at "class": "sidebar_label" Example, in your .sublime-theme file:

// Sidebar entry
{
    "class": "sidebar_label",
    "color": [212, 212, 213],
    "shadow_offset": [0, 0],
    "font.size":13
}

Credit

Only on Firefox "Loading failed for the <script> with source"

I had the same problem (different web app though) with the error message and it turned out to be the MIME-Type for .js files was text/x-js instead of application/javascript due to a duplicate entry in mime.types on the server that was responsible for serving the js files. It seems that this is happening if the header X-Content-Type-Options: nosniff is set, which makes Firefox (and Chrome) block the content of the js files.

The program can’t start because MSVCR71.dll is missing from your computer. Try reinstalling the program to fix this program

Based on this page:

Run regedit (remember to run it as the administrator)
Expand HKEY_LOCAL_MACHINE
Expand SOFTWARE
Expand Microsoft
Expand Windows
Expand CurrentVersion
Expand App Paths
At App Paths, add a new KEY called sqldeveloper.exe
Expand sqldeveloper.exe
Modify the (DEFAULT) value to the full pathway to the sqldeveloper executable (See example below step 11)
Create a new STRING VALUE called PATH and set it value to the sqldeveloper pathway + \jdk\jre\bin

the getSource() and getActionCommand()

getActionCommand()

Returns the command string associated with this action. This string allows a "modal" component to specify one of several commands, depending on its state. For example, a single button might toggle between "show details" and "hide details". The source object and the event would be the same in each case, but the command string would identify the intended action.

IMO, this is useful in case you a single command-component to fire different commands based on it's state, and using this method your handler can execute the right lines of code.

JTextField has JTextField#setActionCommand(java.lang.String) method that you can use to set the command string used for action events generated by it.

getSource()

Returns: The object on which the Event initially occurred.

We can use getSource() to identify the component and execute corresponding lines of code within an action-listener. So, we don't need to write a separate action-listener for each command-component. And since you have the reference to the component itself, you can if you need to make any changes to the component as a result of the event.

If the event was generated by the JTextField then the ActionEvent#getSource() will give you the reference to the JTextField instance itself.

What is a word boundary in regex, does \b match hyphen '-'?

Reference: Mastering Regular Expressions (Jeffrey E.F. Friedl) - O'Reilly

\b is equivalent to (?<!\w)(?=\w)|(?<=\w)(?!\w)

How to count the occurrence of certain item in an ndarray?

You have a special array with only 1 and 0 here. So a trick is to use

np.mean(x)

which gives you the percentage of 1s in your array. Alternatively, use

np.sum(x)
np.sum(1-x)

will give you the absolute number of 1 and 0 in your array.

ORA-00984: column not allowed here

Replace double quotes with single ones:

INSERT
INTO    MY.LOGFILE
        (id,severity,category,logdate,appendername,message,extrainfo)
VALUES  (
       'dee205e29ec34',
       'FATAL',
       'facade.uploader.model',
       '2013-06-11 17:16:31',
       'LOGDB',
       NULL,
       NULL
       )

In SQL, double quotes are used to mark identifiers, not string constants.

Dynamically add properties to a existing object

If you can't use the dynamic type with ExpandoObject, then you could use a 'Property Bag' mechanism, where, using a dictionary (or some other key / value collection type) you store string key's that name the properties and values of the required type.

See here for an example implementation.

How do I load an HTTP URL with App Transport Security enabled in iOS 9?

Followed this.

I have solved it with adding some key in info.plist. The steps I followed are:

Opened my Projects info.plist file
Added a Key called NSAppTransportSecurity as a Dictionary.
Added a Subkey called NSAllowsArbitraryLoads as Boolean and set its value to YES as like following image.

Clean the Project and Now Everything is Running fine as like before.

Ref Link.

Add CSS to <head> with JavaScript?

As you are trying to add a string of CSS to <head> with JavaScript? injecting a string of CSS into a page it is easier to do this with the <link> element than the <style> element.

The following adds p { color: green; } rule to the page.

<link rel="stylesheet" type="text/css" href="data:text/css;charset=UTF-8,p%20%7B%20color%3A%20green%3B%20%7D" />

You can create this in JavaScript simply by URL encoding your string of CSS and adding it the HREF attribute. Much simpler than all the quirks of <style> elements or directly accessing stylesheets.

var linkElement = this.document.createElement('link');
linkElement.setAttribute('rel', 'stylesheet');
linkElement.setAttribute('type', 'text/css');
linkElement.setAttribute('href', 'data:text/css;charset=UTF-8,' + encodeURIComponent(myStringOfstyles));

This will work in IE 5.5 upwards

The solution you have marked will work but this solution requires fewer dom operations and only a single element.

Convert seconds to HH-MM-SS with JavaScript?

below is the given code which will convert seconds into hh-mm-ss format:

var measuredTime = new Date(null);
measuredTime.setSeconds(4995); // specify value of SECONDS
var MHSTime = measuredTime.toISOString().substr(11, 8);

Get alternative method from Convert seconds to HH-MM-SS format in JavaScript

How to watch for a route change in AngularJS?

If you don't want to place the watch inside a specific controller, you can add the watch for the whole aplication in Angular app run()

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

myApp.run(function($rootScope) {
    $rootScope.$on("$locationChangeStart", function(event, next, current) { 
        // handle route changes     
    });
});

How to create file object from URL object (image)

You can make use of ImageIO in order to load the image from an URL and then write it to a file. Something like this:

URL url = new URL("http://google.com/pathtoaimage.jpg");
BufferedImage img = ImageIO.read(url);
File file = new File("downloaded.jpg");
ImageIO.write(img, "jpg", file);

This also allows you to convert the image to some other format if needed.

Windows 10 SSH keys

If you have Windows 10 with the OpenSSH client you may be able to generate the key, but you will have trouble copying it to the target Linux box as the ssh-copy-id command is not part of the client toolset.

Having has this problem I wrote a small PowerShell function to address this, that you add to your profile.

function ssh-copy-id([string]$userAtMachine, [string]$port = 22) {   
    # Get the generated public key
    $key = "$ENV:USERPROFILE" + "/.ssh/id_rsa.pub"
    # Verify that it exists
    if (!(Test-Path "$key")) {
        # Alert user
        Write-Error "ERROR: '$key' does not exist!"            
    }
    else {  
        # Copy the public key across
        & cat "$key" | ssh $userAtMachine -p $port "umask 077; test -d .ssh || mkdir .ssh ; cat >> .ssh/authorized_keys || exit 1"      
    }
}

You can get the gist here

I have a brief write up about it here

CSS Background Opacity

.transbg{/* Fallback for web browsers that don't support RGBa */
background-color: rgb(0, 0, 0);
/* RGBa with 0.6 opacity */
background-color: rgba(0, 0, 0, 0.6);
/* For IE 5.5 - 7*/
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000, endColorstr=#99000000);
/* For IE 8*/
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000, endColorstr=#99000000)";}

How to do left join in Doctrine?

If you have an association on a property pointing to the user (let's say Credit\Entity\UserCreditHistory#user, picked from your example), then the syntax is quite simple:

public function getHistory($users) {
    $qb = $this->entityManager->createQueryBuilder();
    $qb
        ->select('a', 'u')
        ->from('Credit\Entity\UserCreditHistory', 'a')
        ->leftJoin('a.user', 'u')
        ->where('u = :user')
        ->setParameter('user', $users)
        ->orderBy('a.created_at', 'DESC');

    return $qb->getQuery()->getResult();
}

Since you are applying a condition on the joined result here, using a LEFT JOIN or simply JOIN is the same.

If no association is available, then the query looks like following

public function getHistory($users) {
    $qb = $this->entityManager->createQueryBuilder();
    $qb
        ->select('a', 'u')
        ->from('Credit\Entity\UserCreditHistory', 'a')
        ->leftJoin(
            'User\Entity\User',
            'u',
            \Doctrine\ORM\Query\Expr\Join::WITH,
            'a.user = u.id'
        )
        ->where('u = :user')
        ->setParameter('user', $users)
        ->orderBy('a.created_at', 'DESC');

    return $qb->getQuery()->getResult();
}

This will produce a resultset that looks like following:

array(
    array(
        0 => UserCreditHistory instance,
        1 => Userinstance,
    ),
    array(
        0 => UserCreditHistory instance,
        1 => Userinstance,
    ),
    // ...
)

When should I use the Visitor Design Pattern?

your question is when to know:

i do not first code with visitor pattern. i code standard and wait for the need to occur & then refactor. so lets say you have multiple payment systems that you installed one at a time. At checkout time you could have many if conditions (or instanceOf) , for example :

//psuedo code
    if(payPal) 
    do paypal checkout 
    if(stripe)
    do strip stuff checkout
    if(payoneer)
    do payoneer checkout

now imagine i had 10 payment methods, it gets kind of ugly. So when you see that kind of pattern occuring visitor comes in handly to seperate all that out and you end up calling something like this afterwards:

new PaymentCheckoutVistor(paymentType).visit()

You can see how to implement it from the number of examples here, im just showing you a usecase.

How do I get a value of a <span> using jQuery?

<script>
    $(document).ready(function () {

            $.each($(".classBalence").find("span"), function () {
            if ($(this).text() >1) {
                $(this).css("color", "green")

            }
            if ($(this).text() < 1) {
                $(this).css("color", "red")
                $(this).css("font-weight", "bold")
            }
        });

    });
    </script>

How to remove carriage return and newline from a variable in shell script

for a pure shell solution without calling external program:

NL=$'\n'    # define a variable to reference 'newline'

testVar=${testVar%$NL}    # removes trailing 'NL' from string

Find the paths between two given nodes?

Breadth-first search traverses a graph and in fact finds all paths from a starting node. Usually, BFS doesn't keep all paths, however. Instead, it updates a prededecessor function p to save the shortest path. You can easily modify the algorithm so that p(n) doesn't only store one predecessor but a list of possible predecessors.

Then all possible paths are encoded in this function, and by traversing p recursively you get all possible path combinations.

One good pseudocode which uses this notation can be found in Introduction to Algorithms by Cormen et al. and has subsequently been used in many University scripts on the subject. A Google search for “BFS pseudocode predecessor p” uproots this hit on Stack Exchange.

What is the difference between children and childNodes in JavaScript?

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

yourElement.nodeType

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

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

Note that according to Mozilla:

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

Twitter Bootstrap inline input with dropdown

This is my solution is use display: inline

Some text <div class="dropdown" style="display:inline">
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
    Dropdown
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
    <li><a href="#">Action</a></li>
    <li><a href="#">Another action</a></li>
    <li><a href="#">Something else here</a></li>
    <li><a href="#">Separated link</a></li>
  </ul>
</div> is here

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>_x000D_
_x000D_
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>_x000D_
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css" rel="stylesheet" />_x000D_
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />Your text_x000D_
<div class="dropdown" style="display: inline">_x000D_
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">_x000D_
    Dropdown_x000D_
    <span class="caret"></span>_x000D_
  </button>_x000D_
  <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">_x000D_
    <li><a href="#">Action</a>_x000D_
    </li>_x000D_
    <li><a href="#">Another action</a>_x000D_
    </li>_x000D_
    <li><a href="#">Something else here</a>_x000D_
    </li>_x000D_
    <li><a href="#">Separated link</a>_x000D_
    </li>_x000D_
  </ul>_x000D_
</div>is here

_x000D_

Return sql rows where field contains ONLY non-alphanumeric characters

SQL Server doesn't have regular expressions. It uses the LIKE pattern matching syntax which isn't the same.

As it happens, you are close. Just need leading+trailing wildcards and move the NOT

 WHERE whatever NOT LIKE '%[a-z0-9]%'

How can I make XSLT work in chrome?

I tried putting the file in the wwwroot. So when accessing the page in Chrome, this is the address localhost/yourpage.xml.

How to amend older Git commit?

I prepared my commit that I wanted to amend with an older one and was surprised to see that rebase -i complained that I have uncommitted changes. But I didn't want to make my changes again specifying edit option of the older commit. So the solution was pretty easy and straightforward:

prepare your update to older commit, add it and commit
git rebase -i <commit you want to amend>^ - notice the ^ so you see the said commit in the text editor

you will get sometihng like this:

pick 8c83e24 use substitution instead of separate subsystems file to avoid jgroups.xml and jgroups-e2.xml going out of sync
pick 799ce28 generate ec2 configuration out of subsystems-ha.xml and subsystems-full-ha.xml to avoid discrepancies
pick e23d23a fix indentation of jgroups.xml

now to combine e23d23a with 8c83e24 you can change line order and use squash like this:

pick 8c83e24 use substitution instead of separate subsystems file to avoid jgroups.xml and jgroups-e2.xml going out of sync    
squash e23d23a fix indentation of jgroups.xml
pick 799ce28 generate ec2 configuration out of subsystems-ha.xml and subsystems-full-ha.xml to avoid discrepancies

write and exit the file, you will be present with an editor to merge the commit messages. Do so and save/exit the text document
You are done, your commits are amended

credit goes to: http://git-scm.com/book/en/Git-Tools-Rewriting-History There's also other useful demonstrated git magic.

pandas get column average/mean

You can use either of the two statements below:

numpy.mean(df['col_name'])
# or
df['col_name'].mean()

CSS Image size, how to fill, but not stretch?

Building off of @Dominic Green's answer using jQuery, here is a solution that should work for images that are either wider than they are high or higher than they are wide.

http://jsfiddle.net/grZLR/4/

There is probably a more elegant way of doing the JavaScript, but this does work.

function myTest() {
  var imgH = $("#my-img").height();
  var imgW = $("#my-img").width();
  if(imgW > imgH) {
    $(".container img").css("height", "100%");
    var conWidth = $(".container").width();
    var imgWidth = $(".container img").width();
    var gap = (imgWidth - conWidth)/2;
    $(".container img").css("margin-left", -gap);
  } else {
    $(".container img").css("width", "100%");
    var conHeight = $(".container").height();
    var imgHeight = $(".container img").height();
    var gap = (imgHeight - conHeight)/2;
    $(".container img").css("margin-top", -gap);
  }
}
myTest();

Docker - Cannot remove dead container

I have tried the suggestions above but didn't work.

Then

I try : docker system prune -a, it didn't work the first time
I reboot the system
I try again docker system prune -a. This time it works. It will send a warning message and in the end ask "Are you sure you want to continue? y/n? . Ans:y . It will time a time and in the end the dead containers are gone.
Verify with docker ps -a

IMPORTANT - this is the nuclear option as it destroys all containers + images

Text Progress Bar in the Console

Writing '\r' will move the cursor back to the beginning of the line.

This displays a percentage counter:

import time
import sys

for i in range(100):
    time.sleep(1)
    sys.stdout.write("\r%d%%" % i)
    sys.stdout.flush()

File to byte[] in Java

// Returns the contents of the file in a byte array.
    public static byte[] getBytesFromFile(File file) throws IOException {        
        // Get the size of the file
        long length = file.length();

        // You cannot create an array using a long type.
        // It needs to be an int type.
        // Before converting to an int type, check
        // to ensure that file is not larger than Integer.MAX_VALUE.
        if (length > Integer.MAX_VALUE) {
            // File is too large
            throw new IOException("File is too large!");
        }

        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];

        // Read in the bytes
        int offset = 0;
        int numRead = 0;

        InputStream is = new FileInputStream(file);
        try {
            while (offset < bytes.length
                   && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
                offset += numRead;
            }
        } finally {
            is.close();
        }

        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            throw new IOException("Could not completely read file "+file.getName());
        }
        return bytes;
    }

Where do I find the current C or C++ standard documents?

ISO standards cost money, from a moderate amount (for a PDF version), to a bit more (for a book version).

While they aren't finalised however, they can usually be found online, as drafts. Most of the times the final version doesn't differ significantly from the last draft, so while not perfect, they'll suit just fine.

C++ 0x draft

Can we overload the main method in Java?

Yes According to my point of view, we are able to overload the main method but method overloading that's it. For Example

class main_overload {
    public static void main(int a) {
        System.out.println(a);
    }
    public static void main(String args[]) {
        System.out.println("That's My Main Function");
        main(100);
    }
}

In This Double Back slash Step, I am just calling the main method....

Laravel 4: Redirect to a given url

Yes, it's

use Illuminate\Support\Facades\Redirect;

return Redirect::to('http://heera.it');

Check the documentation.

Update: Redirect::away('url') (For external link, Laravel Version 4.19):

public function away($path, $status = 302, $headers = array())
{
    return $this->createRedirect($path, $status, $headers);
}

Change the color of a checked menu item in a navigation drawer

Step 1: Build a checked/unchecked selector:

selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/yellow" android:state_checked="true" />
    <item android:color="@color/white" android:state_checked="false" />
</selector>

Step 2: use the xml attribute app:itemTextColor within NavigationView widget for selecting the text color.

<android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:headerLayout="@layout/navigation_header_layout"
    app:itemTextColor="@drawable/selector"
    app:menu="@menu/navigation_menu" />

Step 3:
For some reason when you hit an item from the NavigationView menu, it doesn't consider this as a button check. So you need to manually get the selected item checked and clear the previously selected item. Use below listener to do that

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {

    int id = item.getItemId();

    // remove all colors of the items to the `unchecked` state of the selector
    removeColor(mNavigationView);

    // check the selected item to change its color set by the `checked` state of the selector
    item.setChecked(true);

    switch (item.getItemId()) {
      case R.id.dashboard:
          ...
    }

    drawerLayout.closeDrawer(GravityCompat.START);
    return true;
}

private void removeColor(NavigationView view) {
    for (int i = 0; i < view.getMenu().size(); i++) {
        MenuItem item = view.getMenu().getItem(i);
        item.setChecked(false);
    }
}

Step 4:
To change icon color, use the app:iconTint attribute in the NavigationView menu items, and set to the same selector.

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/nav_account"
        android:checked="true"
        android:icon="@drawable/ic_person_black_24dp"
        android:title="My Account"
        app:iconTint="@drawable/selector" />
    <item
        android:id="@+id/nav_settings"
        android:icon="@drawable/ic_settings_black_24dp"
        android:title="Settings"
        app:iconTint="@drawable/selector" />

    <item
        android:id="@+id/nav_logout"
        android:icon="@drawable/logout"
        android:title="Log Out"
        app:iconTint="@drawable/selector" />
</menu>

Result:

How to create war files

Simpler solution which also refreshes the Eclipse workspace:

<?xml version="1.0" encoding="UTF-8"?>
<project name="project" default="default">    
    <target name="default">
        <war destfile="target/MyApplication.war" webxml="web/WEB-INF/web.xml">
            <fileset dir="src/main/java" />
            <fileset dir="web/WEB-INF/views" />
            <lib dir="web/WEB-INF/lib"/>
            <classes dir="target/classes" />
        </war>
        <eclipse.refreshLocal resource="MyApplication/target" depth="infinite"/>
    </target>
</project>

PHP to search within txt file and echo the whole line

Do it like this. This approach lets you search a file of any size (big size won't crash the script) and will return ALL lines that match the string you want.

<?php
$searchthis = "mystring";
$matches = array();

$handle = @fopen("path/to/inputfile.txt", "r");
if ($handle)
{
    while (!feof($handle))
    {
        $buffer = fgets($handle);
        if(strpos($buffer, $searchthis) !== FALSE)
            $matches[] = $buffer;
    }
    fclose($handle);
}

//show results:
print_r($matches);
?>

Note the way strpos is used with !== operator.

Format numbers in thousands (K) in Excel

The examples above use a 'K' an uppercase k used to represent kilo or 1000. According to wiki, kilo or 1000's should be represented in lower case. So, rather than £300K, use £300k or in a code example :-

[>=1000]£#,##0,"k";[red][<=-1000]-£#,##0,"k";0

Installing Apple's Network Link Conditioner Tool

The tools can now be found ("Hardware IO tools") here: https://developer.apple.com/download/more/

git remote add with other SSH port

You need to edit your ~/.ssh/config file. Add something like the following:

Host example.com
    Port 1234

A quick google search shows a few different resources that explain it in more detail than me.

How to return Json object from MVC controller to view

$.ajax({
    dataType: "json",
    type: "POST",
    url: "/Home/AutocompleteID",
    data: data,
    success: function (data) {
        $('#search').html('');
        $('#search').append(data[0].Scheme_Code);
        $('#search').append(data[0].Scheme_Name);
    }
});

window.onload vs document.onload

In Chrome, window.onload is different from <body onload="">, whereas they are the same in both Firefox(version 35.0) and IE (version 11).

You could explore that by the following snippet:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <!--import css here-->
        <!--import js scripts here-->

        <script language="javascript">

            function bodyOnloadHandler() {
                console.log("body onload");
            }

            window.onload = function(e) {
                console.log("window loaded");
            };
        </script>
    </head>

    <body onload="bodyOnloadHandler()">

        Page contents go here.

    </body>
</html>

And you will see both "window loaded"(which comes firstly) and "body onload" in Chrome console. However, you will see just "body onload" in Firefox and IE. If you run "window.onload.toString()" in the consoles of IE & FF, you will see:

"function onload(event) { bodyOnloadHandler() }"

which means that the assignment "window.onload = function(e)..." is overwritten.

Django - how to create a file and save it to a model's FileField?

You want to have a look at FileField and FieldFile in the Django docs, and especially FieldFile.save().

Basically, a field declared as a FileField, when accessed, gives you an instance of class FieldFile, which gives you several methods to interact with the underlying file. So, what you need to do is:

self.license_file.save(new_name, new_contents)

where new_name is the filename you wish assigned and new_contents is the content of the file. Note that new_contents must be an instance of either django.core.files.File or django.core.files.base.ContentFile (see given links to manual for the details).

The two choices boil down to:

from django.core.files.base import ContentFile, File

# Using File
with open('/path/to/file') as f:
    self.license_file.save(new_name, File(f))

# Using ContentFile
self.license_file.save(new_name, ContentFile('A string with the file content'))

dbms_lob.getlength() vs. length() to find blob size in oracle

length and dbms_lob.getlength return the number of characters when applied to a CLOB (Character LOB). When applied to a BLOB (Binary LOB), dbms_lob.getlength will return the number of bytes, which may differ from the number of characters in a multi-byte character set.

As the documentation doesn't specify what happens when you apply length on a BLOB, I would advise against using it in that case. If you want the number of bytes in a BLOB, use dbms_lob.getlength.

Find (and kill) process locking port 3000 on Mac

You can use lsof -i:3000.

That is "List Open Files". This gives you a list of the processes and which files and ports they use.

Class name does not name a type in C++

error 'Class' does not name a type

Just in case someone does the same idiotic thing I did ... I was creating a small test program from scratch and I typed Class instead of class (with a small C). I didn't take any notice of the quotes in the error message and spent a little too long not understanding my problem.

My search for a solution brought me here so I guess the same could happen to someone else.

Embed YouTube Video with No Ads

From the YouTube help:

You will automatically be opted into showing ads on embedded videos if you've associated your YouTube and AdSense accounts and have enabled your videos for embedding.

If you don't want to show overlay ads on your embedded videos, you can opt your videos out of showing overlay ads, though this will also disable overlay ads on your videos on YouTube.com. You may also disable your videos for embedding.

https://support.google.com/youtube/answer/132596?hl=en

Another technical solution could be to use a custom video player, and streamline the youtube video with that one. Have not tried but guess that the ads cannot be displayed in a custom player. However, could be forbidden.

Why does JS code "var a = document.querySelector('a[data-a=1]');" cause error?

Took me a while to find this out but if you a number stored in a variable, say x and you want to select it, use

document.querySelector('a[data-a= + CSS.escape(x) + ']').

This is due to some attribute naming specifications that I'm not yet very familiar with. Hope this will help someone.

Get SELECT's value and text in jQuery

You can do like this, to get the currently selected value:

$('#myDropdownID').val();

& to get the currently selected text:

$('#myDropdownID:selected').text();

iOS UIImagePickerController result image orientation after upload

I figured out a much simpler one:

- (UIImage *)normalizedImage {
    if (self.imageOrientation == UIImageOrientationUp) return self; 

    UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
    [self drawInRect:(CGRect){0, 0, self.size}];
    UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return normalizedImage;
}

BTW: @Anomie's code does not take scale into account, so will not work for 2x images.

Including JavaScript class definition from another file in Node.js

Instead of myFile.js write your files like myFile.mjs. This extension comes with all the goodies of es6, but I mean I recommend you to you webpack and Babel

How do you handle a form change in jQuery?

First, I'd add a hidden input to your form to track the state of the form. Then, I'd use this jQuery snippet to set the value of the hidden input when something on the form changes:

    $("form")
    .find("input")
    .change(function(){
        if ($("#hdnFormChanged").val() == "no")
        {
            $("#hdnFormChanged").val("yes");
        }
    });

When your button is clicked, you can check the state of your hidden input:

$("#Button").click(function(){
    if($("#hdnFormChanged").val() == "yes")
    {
        // handler code here...
    }
});

How to duplicate object properties in another object?

How to make an element in XML schema optional?

Try this

<xs:element name="description" type="xs:string" minOccurs="0" maxOccurs="1" />

if you want 0 or 1 "description" elements, Or

<xs:element name="description" type="xs:string" minOccurs="0" maxOccurs="unbounded" />

if you want 0 to infinity number of "description" elements.

What arguments are passed into AsyncTask<arg1, arg2, arg3>?

Refer to following links:

You cannot pass more than three arguments, if you want to pass only 1 argument then use void for the other two arguments.

1. private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> 


2. protected class InitTask extends AsyncTask<Context, Integer, Integer>

An asynchronous task is defined by a computation that runs on a background thread and whose result is published on the UI thread. An asynchronous task is defined by 3 generic types, called Params, Progress and Result, and 4 steps, called onPreExecute, doInBackground, onProgressUpdate and onPostExecute.

KPBird

Replacing objects in array

function getMatch(elem) {
    function action(ele, val) {
        if(ele === val){ 
            elem = arr2[i]; 
        }
    }

    for (var i = 0; i < arr2.length; i++) {
        action(elem.id, Object.values(arr2[i])[0]);
    }
    return elem;
}

var modified = arr1.map(getMatch);

How do I use Docker environment variable in ENTRYPOINT array?

After much pain, and great assistance from @vitr et al above, i decided to try

standard bash substitution
shell form of ENTRYPOINT (great tip from above)

and that worked.

ENV LISTEN_PORT=""

ENTRYPOINT java -cp "app:app/lib/*" hello.Application --server.port=${LISTEN_PORT:-80}

e.g.

docker run --rm -p 8080:8080 -d --env LISTEN_PORT=8080 my-image

and

docker run --rm -p 8080:80 -d my-image

both set the port correctly in my container

Refs

see https://www.cyberciti.biz/tips/bash-shell-parameter-substitution-2.html

Can you disable tabs in Bootstrap?

Old question but it kind of pointed me in the right direction. The method I went for was to add the disabled class to the li and then added the following code to my Javascript file.

$('.nav-tabs li.disabled > a[data-toggle=tab]').on('click', function(e) {
    e.stopImmediatePropagation();
});

This will disable any link where the li has a class of disabled. Kind of similar to totas's answer but it won't run the if every time a user clicks any tab link and it doesn't use return false.

Hopefully it'll be useful to someone!

VBA check if file exists

For checking existence one can also use (works for both, files and folders):

Not Dir(DirFile, vbDirectory) = vbNullString

_{The result is True if a file or a directory exists.}

Example:

If Not Dir("C:\Temp\test.xlsx", vbDirectory) = vbNullString Then
    MsgBox "exists"
Else
    MsgBox "does not exist"
End If

How to set downloading file name in ASP.NET Web API

You need to add the content-disposition header to the response:

 response.StatusCode = HttpStatusCode.OK;
 response.Content = new StreamContent(result);
 response.AppendHeader("content-disposition", "attachment; filename=" + fileName);
 return response;

Android ImageView's onClickListener does not work

Try by passing the context instead of the application context (You can also add a log statement to check if the onClick method is ever run) :

imgFavorite.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d("== My activity ===","OnClick is called");
            Toast.makeText(v.getContext(), // <- Line changed
                    "The favorite list would appear on clicking this icon",
                    Toast.LENGTH_LONG).show();
        }
    });

Sorting arrays in javascript by object key value

Use Array's sort() method, eg

myArray.sort(function(a, b) {
    return a.distance - b.distance;
});

Seeking useful Eclipse Java code templates

slf4j Logging

${imp:import(org.slf4j.Logger,org.slf4j.LoggerFactory)}

private static final Logger LOGGER = LoggerFactory
    .getLogger(${enclosing_type}.class);

How to fix Invalid AES key length?

I was facing the same issue then i made my key 16 byte and it's working properly now. Create your key exactly 16 byte. It will surely work.

Find oldest/youngest datetime object in a list

Oldest:

oldest = min(datetimes)

Youngest before now:

now = datetime.datetime.now(pytz.utc)
youngest = max(dt for dt in datetimes if dt < now)

Alternate table row color using CSS?

You have the :nth-child() pseudo-class:

table tr:nth-child(odd) td{
    ...
}
table tr:nth-child(even) td{
    ...
}

In the early days of :nth-child() its browser support was kind of poor. That's why setting class="odd" became such a common technique. In late 2013 I'm glad to say that IE6 and IE7 are finally dead (or sick enough to stop caring) but IE8 is still around — thankfully, it's the only exception.

in iPhone App How to detect the screen resolution of the device

Use this code it will help for getting any type of device's screen resolution

 [[UIScreen mainScreen] bounds].size.height
 [[UIScreen mainScreen] bounds].size.width

Set Value of Input Using Javascript Function

Depending on the usecase it makes a difference whether you use javascript (element.value = x) or jQuery $(element).val(x);

When x is undefined jQuery results in an empty String whereas javascript results in "undefined" as a String.

Firing events on CSS class changes in jQuery

There is one more way without triggering an custom event

A jQuery Plug-in to monitor Html Element CSS Changes by Rick Strahl

Quoting from above

The watch plug-in works by hooking up to DOMAttrModified in FireFox, to onPropertyChanged in Internet Explorer, or by using a timer with setInterval to handle the detection of changes for other browsers. Unfortunately WebKit doesn’t support DOMAttrModified consistently at the moment so Safari and Chrome currently have to use the slower setInterval mechanism.

Multi column forms with fieldsets

There are a couple of things that need to be adjusted in your layout:

You are nesting col elements within form-group elements. This should be the other way around (the form-group should be within the col-sm-xx element).
You should always use a row div for each new "row" in your design. In your case, you would need at least 5 rows (Username, Password and co, Title/First/Last name, email, Language). Otherwise, your problematic .col-sm-12 is still on the same row with the above 3 .col-sm-4 resulting in a total of columns greater than 12, and causing the overlap problem.

Here is a fixed demo.

And an excerpt of what the problematic section HTML should become:

<fieldset>
    <legend>Personal Information</legend>
    <div class='row'>
        <div class='col-sm-4'>    
            <div class='form-group'>
                <label for="user_title">Title</label>
                <input class="form-control" id="user_title" name="user[title]" size="30" type="text" />
            </div>
        </div>
        <div class='col-sm-4'>
            <div class='form-group'>
                <label for="user_firstname">First name</label>
                <input class="form-control" id="user_firstname" name="user[firstname]" required="true" size="30" type="text" />
            </div>
        </div>
        <div class='col-sm-4'>
            <div class='form-group'>
                <label for="user_lastname">Last name</label>
                <input class="form-control" id="user_lastname" name="user[lastname]" required="true" size="30" type="text" />
            </div>
        </div>
    </div>
    <div class='row'>
        <div class='col-sm-12'>
            <div class='form-group'>

                <label for="user_email">Email</label>
                <input class="form-control required email" id="user_email" name="user[email]" required="true" size="30" type="text" />
            </div>
        </div>
    </div>
</fieldset>

Call ASP.NET function from JavaScript?

It is so easy for both scenarios (that is, synchronous/asynchronous) if you want to trigger a server-side event handler, for example, Button's click event.

For triggering an event handler of a control: If you added a ScriptManager on your page already then skip step 1.

Add the following in your page client script section

//<![CDATA[
var theForm = document.forms['form1'];
if (!theForm) {
    theForm = document.form1;
}
function __doPostBack(eventTarget, eventArgument) {
    if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
        theForm.__EVENTTARGET.value = eventTarget;
        theForm.__EVENTARGUMENT.value = eventArgument;
        theForm.submit();
    }
}
//]]>

Write you server side event handler for your control

protected void btnSayHello_Click(object sender, EventArgs e) { Label1.Text = "Hello World..."; }
Add a client function to call the server side event handler

function SayHello() { __doPostBack("btnSayHello", ""); }

Replace the "btnSayHello" in code above with your control's client id.

By doing so, if your control is inside an update panel, the page will not refresh. That is so easy.

One other thing to say is that: Be careful with client id, because it depends on you ID-generation policy defined with the ClientIDMode property.

How to set fake GPS location on IOS real device

There are one solution for fake GPS in ios simulator and real device. we can use GPX file for fake GPS and simulation.

I followed the step by step guidelines of GPX file use in Xcode with simulation. Here is full step by step guidelines of GPX file use. And also you can download the GPX file Demo from github.

Calculate date from week number

Week 1 is defined as being the week that starts on a Monday and contains the first Thursday of the year.

How do you use math.random to generate random ints?

int abc= (Math.random()*100);//  wrong

you wil get below error message

Exception in thread "main" java.lang.Error: Unresolved compilation problem: Type mismatch: cannot convert from double to int

int abc= (int) (Math.random()*100);// add "(int)" data type

,known as type casting

if the true result is

int abc= (int) (Math.random()*1)=0.027475

Then you will get output as "0" because it is a integer data type.

int abc= (int) (Math.random()*100)=0.02745

output:2 because (100*0.02745=2.7456...etc)

ldap query for group members

The query should be:

(&(objectCategory=user)(memberOf=CN=Distribution Groups,OU=Mybusiness,DC=mydomain.local,DC=com))

You missed & and ()

Division of integers in Java

As your output results a double you should cast either completed variable or total variable or both to double while dividing.

So, the correct implmentation will be:

System.out.println((double)completed/total);

How to set a Postgresql default value datestamp like 'YYYYMM'?

Thanks for everyone who answered, and thanks for those who gave me the function-format idea, i'll really study it for future using.

But for this explicit case, the 'special yyyymm field' is not to be considered as a date field, but just as a tag, o whatever would be used for matching the exactly year-month researched value; there is already another date field, with the full timestamp, but if i need all the rows of january 2008, i think that is faster a select like

SELECT  [columns] FROM table WHERE yearmonth = '200801'

instead of

SELECT  [columns] FROM table WHERE date BETWEEN DATE('2008-01-01') AND DATE('2008-01-31')

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

I wrote a very light-weight alternative to PHP's var_dump for using in Python and made it open source later.

GitHub: https://github.com/sha256/python-var-dump

You can simply install it using pip:

pip install var_dump

Allow User to input HTML in ASP.NET MVC - ValidateInput or AllowHtml

URL Encoding the data works as well for me

For example

var data = '<b>Hello</b>'

In Browser call encodeURIComponent(data) before posting

On Server call HttpUtility.UrlDecode(received_data) to decode

That way you can control exactly which fields area allowed to have html

Use dynamic (variable) string as regex pattern in JavaScript

To create the regex from a string, you have to use JavaScript's RegExp object.

If you also want to match/replace more than one time, then you must add the g (global match) flag. Here's an example:

var stringToGoIntoTheRegex = "abc";
var regex = new RegExp("#" + stringToGoIntoTheRegex + "#", "g");
// at this point, the line above is the same as: var regex = /#abc#/g;

var input = "Hello this is #abc# some #abc# stuff.";
var output = input.replace(regex, "!!");
alert(output); // Hello this is !! some !! stuff.

JSFiddle demo here.

In the general case, escape the string before using as regex:

Not every string is a valid regex, though: there are some speciall characters, like ( or [. To work around this issue, simply escape the string before turning it into a regex. A utility function for that goes in the sample below:

function escapeRegExp(stringToGoIntoTheRegex) {
    return stringToGoIntoTheRegex.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
}

var stringToGoIntoTheRegex = escapeRegExp("abc"); // this is the only change from above
var regex = new RegExp("#" + stringToGoIntoTheRegex + "#", "g");
// at this point, the line above is the same as: var regex = /#abc#/g;

var input = "Hello this is #abc# some #abc# stuff.";
var output = input.replace(regex, "!!");
alert(output); // Hello this is !! some !! stuff.

JSFiddle demo here.

Note: the regex in the question uses the s modifier, which didn't exist at the time of the question, but does exist -- a s (dotall) flag/modifier in JavaScript -- today.

No templates in Visual Studio 2017

I found the path and wrote it in the options

how to create a login page when username and password is equal in html

Doing password checks on client side is unsafe especially when the password is hard coded.

The safest way is password checking on server side, but even then the password should not be transmitted plain text.

Checking the password client side is possible in a "secure way":

The password needs to be hashed
The hashed password is used as part of a new url

Say "abc" is your password so your md5 would be "900150983cd24fb0d6963f7d28e17f72" (consider salting!). Now build a url containing the hash (like http://yourdomain.com/90015...f72.html).

Python class input argument

Remove the name param from the class declaration. The init method is used to pass arguments to a class at creation.

class Person(object):
  def __init__(self, name):
    self.name = name

me = Person("TheLazyScripter")
print me.name

How to add an image to an svg container using D3.js

 var svg = d3.select("body")
        .append("svg")
        .style("width", 200)
        .style("height", 100)

Shell Script Syntax Error: Unexpected End of File

I have encountered the same error while trying to execute a script file created in windows OS using textpad. so that one can select proper file format like unix/mac etc.. or recreate the script in linux iteself.

What's the source of Error: getaddrinfo EAI_AGAIN?

The OP's error specifies a host (my-store.myshopify.com). The error I encountered is the same in all respects except that no domain is specified.

My solution may help others who are drawn here by the title "Error: getaddrinfo EAI_AGAIN"

I encountered the error when trying to serve a NodeJs & VueJs app from a different VM from where the code was developed originally.

The file vue.config.js read :

 module.exports = {
   devServer: {
     host: 'tstvm01',
     port: 3030,
   },
 };

When served on the original machine the start up output is :

App running at:
- Local:   http://tstvm01:3030/ 
- Network: http://tstvm01:3030/

Using the same settings on a VM tstvm07 got me a very similar error to the one the OP describes:

 INFO  Starting development server...
 10% building modules 1/1 modules 0 activeevents.js:183                              
      throw er; // Unhandled 'error' event
      ^

Error: getaddrinfo EAI_AGAIN
    at Object._errnoException (util.js:1022:11)
    at errnoException (dns.js:55:15)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:92:26)

If it ain't already obvious, changing vue.config.js to read ...

 module.exports = {
   devServer: {
     host: 'tstvm07',
     port: 3030,
   },
 };

... solved the problem.

How do I delete virtual interface in Linux?

You can use sudo ip link delete to remove the interface.

Accessing a resource via codebehind in WPF

You can use a resource key like this:

<UserControl.Resources>
    <SolidColorBrush x:Key="{x:Static local:Foo.MyKey}">Blue</SolidColorBrush>
</UserControl.Resources>
<Grid Background="{StaticResource {x:Static local:Foo.MyKey}}" />

public partial class Foo : UserControl
{
    public Foo()
    {
        InitializeComponent();
        var brush = (SolidColorBrush)FindResource(MyKey);
    }

    public static ResourceKey MyKey { get; } = CreateResourceKey();

    private static ComponentResourceKey CreateResourceKey([CallerMemberName] string caller = null)
    {
        return new ComponentResourceKey(typeof(Foo), caller); ;
    }
}

Redirect on select option in select box

Because the first option is already selected, the change event is never fired. Add an empty value as the first one and check for empty in the location assignment.

Here's an example:

https://jsfiddle.net/bL5sq/

_x000D_

<select onchange="this.options[this.selectedIndex].value && (window.location = this.options[this.selectedIndex].value);">_x000D_
  <option value="">Select...</option>_x000D_
  <option value="https://google.com">Google</option>_x000D_
  <option value="https://yahoo.com">Yahoo</option>_x000D_
</select>

_x000D_

Shell script current directory?

To print the current working Directory i.e. pwd just type command like:

echo "the PWD is : ${pwd}"

Select the first row by group

now, for dplyr, adding a distinct counter.

df %>%
    group_by(aa, bb) %>%
    summarise(first=head(value,1), count=n_distinct(value))

You create groups, them summarise within groups.

If data is numeric, you can use:
first(value) [there is also last(value)] in place of head(value, 1)

see: http://cran.rstudio.com/web/packages/dplyr/vignettes/introduction.html

Full:

> df
Source: local data frame [16 x 3]

   aa bb value
1   1  1   GUT
2   1  1   PER
3   1  2   SUT
4   1  2   GUT
5   1  3   SUT
6   1  3   GUT
7   1  3   PER
8   2  1   221
9   2  1   224
10  2  1   239
11  2  2   217
12  2  2   221
13  2  2   224
14  3  1   GUT
15  3  1   HUL
16  3  1   GUT

> library(dplyr)
> df %>%
>   group_by(aa, bb) %>%
>   summarise(first=head(value,1), count=n_distinct(value))

Source: local data frame [6 x 4]
Groups: aa

  aa bb first count
1  1  1   GUT     2
2  1  2   SUT     2
3  1  3   SUT     3
4  2  1   221     3
5  2  2   217     3
6  3  1   GUT     2

Always pass weak reference of self into block in ARC?

Some explanation ignore a condition about the retain cycle [If a group of objects is connected by a circle of strong relationships, they keep each other alive even if there are no strong references from outside the group.] For more information, read the document

Using momentjs to convert date to epoch then back to date

There are a few things wrong here:

First, terminology. "Epoch" refers to the starting point of something. The "Unix Epoch" is Midnight, January 1st 1970 UTC. You can't convert an arbitrary "date string to epoch". You probably meant "Unix Time", which is often erroneously called "Epoch Time".
.unix() returns Unix Time in whole seconds, but the default moment constructor accepts a timestamp in milliseconds. You should instead use .valueOf() to return milliseconds. Note that calling .unix()*1000 would also work, but it would result in a loss of precision.
You're parsing a string without providing a format specifier. That isn't a good idea, as values like 1/2/2014 could be interpreted as either February 1st or as January 2nd, depending on the locale of where the code is running. (This is also why you get the deprecation warning in the console.) Instead, provide a format string that matches the expected input, such as:
```
moment("10/15/2014 9:00", "M/D/YYYY H:mm")
```
.calendar() has a very specific use. If you are near to the date, it will return a value like "Today 9:00 AM". If that's not what you expected, you should use the .format() function instead. Again, you may want to pass a format specifier.
To answer your questions in comments, No - you don't need to call .local() or .utc().

Putting it all together:

var ts = moment("10/15/2014 9:00", "M/D/YYYY H:mm").valueOf();
var m = moment(ts);
var s = m.format("M/D/YYYY H:mm");
alert("Values are: ts = " + ts + ", s = " + s);

On my machine, in the US Pacific time zone, it results in:

Values are: ts = 1413388800000, s = 10/15/2014 9:00

Since the input value is interpreted in terms of local time, you will get a different value for ts if you are in a different time zone.

Also note that if you really do want to work with whole seconds (possibly losing precision), moment has methods for that as well. You would use .unix() to return the timestamp in whole seconds, and moment.unix(ts) to parse it back to a moment.

var ts = moment("10/15/2014 9:00", "M/D/YYYY H:mm").unix();
var m = moment.unix(ts);

Syntax of for-loop in SQL Server

For loop is not officially supported yet by SQL server. Already there is answer on achieving FOR Loop's different ways. I am detailing answer on ways to achieve different types of loops in SQL server.

FOR Loop

DECLARE @cnt INT = 0;

WHILE @cnt < 10
BEGIN
   PRINT 'Inside FOR LOOP';
   SET @cnt = @cnt + 1;
END;

PRINT 'Done FOR LOOP';

If you know, you need to complete first iteration of loop anyway, then you can try DO..WHILE or REPEAT..UNTIL version of SQL server.

DO..WHILE Loop

DECLARE @X INT=1;

WAY:  --> Here the  DO statement

  PRINT @X;

  SET @X += 1;

IF @X<=10 GOTO WAY;

REPEAT..UNTIL Loop

DECLARE @X INT = 1;

WAY:  -- Here the REPEAT statement

  PRINT @X;

  SET @X += 1;

IFNOT(@X > 10) GOTO WAY;

Reference

youtube: link to display HD video by default

Nick Vogt at H3XED posted this syntax: https://www.youtube.com/v/VIDEOID?version=3&vq=hd1080

Take this link and replace the expression "VIDEOID" with the (shortened/shared) ID of the video.

Exapmple for ID: i3jNECZ3ybk looks like this: ... /v/i3jNECZ3ybk?version=3&vq=hd1080

What you get as a result is the standalone 1080p video but not in the Tube environment.

How can I make a TextBox be a "password box" and display stars when using MVVM?

Thanks Cody, that was very helpful. I've just added an example for guys using the Delegate Command in C#

<PasswordBox x:Name="PasswordBox"
             Grid.Row="1" Grid.Column="1"
             HorizontalAlignment="Left" 
             Width="300" Height="25"
             Margin="6,7,0,7" />
<Button Content="Login"
        Grid.Row="4" Grid.Column="1"
        Style="{StaticResource StandardButton}"
        Command="{Binding LoginCommand}"
        CommandParameter="{Binding ElementName=PasswordBox}"
        Height="31" Width="92"
        Margin="5,9,0,0" />

public ICommand LoginCommand
{
   get
   {
        return new DelegateCommand<object>((args) =>
        {
            // Get Password as Binding not supported for control-type PasswordBox
            LoginPassword = ((PasswordBox) args).Password;

            // Rest of code here
        });
   }
}

Can't start Tomcat as Windows Service

Check the apache tomcat catalina log: ../logs/catalina.log
If in the log you find the "port was used" exception, then Check windows used ports and processes with following command: Run cmd netstat -ao it will list all listening ports and corresponding process Id, you can find the port which was used by Tomcat from the configuration file: ../conf/server.xml
```
<Connector port="8080" protocol="HTTP/1.1"
       connectionTimeout="20000"
       redirectPort="8443" />
```

and kill the process which use the tomcat port

Giving multiple URL patterns to Servlet Filter

In case you are using the annotation method for filter definition (as opposed to defining them in the web.xml), you can do so by just putting an array of mappings in the @WebFilter annotation:

/**
 * Filter implementation class LoginFilter
 */
@WebFilter(urlPatterns = { "/faces/Html/Employee","/faces/Html/Admin", "/faces/Html/Supervisor"})
public class LoginFilter implements Filter {
    ...

And just as an FYI, this same thing works for servlets using the servlet annotation too:

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet({"/faces/Html/Employee", "/faces/Html/Admin", "/faces/Html/Supervisor"})
public class LoginServlet extends HttpServlet {
    ...

Scala check if element is present in a list

Just use contains

myFunction(strings.contains(myString))

Explanation of <script type = "text/template"> ... </script>

To add to Box9's answer:

Backbone.js is dependent on underscore.js, which itself implements John Resig's original microtemplates.

If you decide to use Backbone.js with Rails, be sure to check out the Jammit gem. It provides a very clean way to manage asset packaging for templates. http://documentcloud.github.com/jammit/#jst

By default Jammit also uses JResig's microtemplates, but it also allows you to replace the templating engine.

Inheritance and init method in Python

A simple change in Num2 class like this:

super().__init__(num)

It works in python3.

class Num:
        def __init__(self,num):
                self.n1 = num

class Num2(Num):
        def __init__(self,num):
                super().__init__(num)
                self.n2 = num*2
        def show(self):
                print (self.n1,self.n2)

mynumber = Num2(8)
mynumber.show()

SQL Query - Concatenating Results into One String

For SQL Server 2005 and above use Coalesce for nulls and I am using Cast or Convert if there are numeric values -

declare @CodeNameString  nvarchar(max)
select  @CodeNameString = COALESCE(@CodeNameString + ',', '')  + Cast(CodeName as varchar) from AccountCodes  ORDER BY Sort
select  @CodeNameString

Skipping Incompatible Libraries at compile

Normally, that is not an error per se; it is a warning that the first file it found that matches the -lPI-Http argument to the compiler/linker is not valid. The error occurs when no other library can be found with the right content.

So, you need to look to see whether /dvlpmnt/libPI-Http.a is a library of 32-bit object files or of 64-bit object files - it will likely be 64-bit if you are compiling with the -m32 option. Then you need to establish whether there is an alternative libPI-Http.a or libPI-Http.so file somewhere else that is 32-bit. If so, ensure that the directory that contains it is listed in a -L/some/where argument to the linker. If not, then you will need to obtain or build a 32-bit version of the library from somewhere.

To establish what is in that library, you may need to do:

mkdir junk
cd junk
ar x /dvlpmnt/libPI-Http.a
file *.o
cd ..
rm -fr junk

The 'file' step tells you what type of object files are in the archive. The rest just makes sure you don't make a mess that can't be easily cleaned up.

How to use a variable for the database name in T-SQL?

Put the entire script into a template string, with {SERVERNAME} placeholders. Then edit the string using:

SET @SQL_SCRIPT = REPLACE(@TEMPLATE, '{SERVERNAME}', @DBNAME)

and then run it with

EXECUTE (@SQL_SCRIPT)

It's hard to believe that, in the course of three years, nobody noticed that my code doesn't work!

You can't EXEC multiple batches. GO is a batch separator, not a T-SQL statement. It's necessary to build three separate strings, and then to EXEC each one after substitution.

I suppose one could do something "clever" by breaking the single template string into multiple rows by splitting on GO; I've done that in ADO.NET code.

And where did I get the word "SERVERNAME" from?

Here's some code that I just tested (and which works):

DECLARE @DBNAME VARCHAR(255)
SET @DBNAME = 'TestDB'

DECLARE @CREATE_TEMPLATE VARCHAR(MAX)
DECLARE @COMPAT_TEMPLATE VARCHAR(MAX)
DECLARE @RECOVERY_TEMPLATE VARCHAR(MAX)

SET @CREATE_TEMPLATE = 'CREATE DATABASE {DBNAME}'
SET @COMPAT_TEMPLATE='ALTER DATABASE {DBNAME} SET COMPATIBILITY_LEVEL = 90'
SET @RECOVERY_TEMPLATE='ALTER DATABASE {DBNAME} SET RECOVERY SIMPLE'

DECLARE @SQL_SCRIPT VARCHAR(MAX)

SET @SQL_SCRIPT = REPLACE(@CREATE_TEMPLATE, '{DBNAME}', @DBNAME)
EXECUTE (@SQL_SCRIPT)

SET @SQL_SCRIPT = REPLACE(@COMPAT_TEMPLATE, '{DBNAME}', @DBNAME)
EXECUTE (@SQL_SCRIPT)

SET @SQL_SCRIPT = REPLACE(@RECOVERY_TEMPLATE, '{DBNAME}', @DBNAME)
EXECUTE (@SQL_SCRIPT)

Efficient iteration with index in Scala

Looping in scala is pretty simple. Create any array of your choice for ex.

val myArray = new Array[String](3)
myArray(0)="0";
myArray(1)="1";
myArray(2)="2";

Types of loops,

for(data <- myArray)println(data)

for (i <- 0 until myArray.size)
println(i + ": " + myArray(i))

Escaping regex string

You can use re.escape():

re.escape(string) Return string with all non-alphanumerics backslashed; this is useful if you want to match an arbitrary literal string that may have regular expression metacharacters in it.

>>> import re
>>> re.escape('^a.*$')
'\\^a\\.\\*\\$'

If you are using a Python version < 3.7, this will escape non-alphanumerics that are not part of regular expression syntax as well.

If you are using a Python version < 3.7 but >= 3.3, this will escape non-alphanumerics that are not part of regular expression syntax, except for specifically underscore (_).

Convert an array to string

You probably want something like this overload of String.Join:

String.Join<T> Method (String, IEnumerable<T>)

Docs:

http://msdn.microsoft.com/en-us/library/dd992421.aspx

In your example, you'd use

String.Join("", Client);

Setting a divs background image to fit its size?

If you'd like to use CSS3, you can do it pretty simply using background-size, like so:

background-size: 100%;

It is supported by all major browsers (including IE9+). If you'd like to get it working in IE8 and before, check out the answers to this question.

Java - How to find the redirected url of a url?

@balusC I did as you wrote . In my case , I've added cookie information to be able to reuse the session .

   // get the cookie if need
    String cookies = conn.getHeaderField("Set-Cookie");

    // open the new connnection again
    conn = (HttpURLConnection) new URL(newUrl).openConnection();
    conn.setRequestProperty("Cookie", cookies);

How to select an element inside "this" in jQuery?

I use this to get the Parent, similarly for child

$( this ).children( 'li.target' ).css("border", "3px double red");

Good Luck

How to sort an array of objects in Java?

Update for Java 8 constructs

Assuming a Book class with a name field getter, you can use Arrays.sort method by passing an additional Comparator specified using Java 8 constructs - Comparator default method & method references.

Arrays.sort(bookArray, Comparator.comparing(Book::getName));

Also, it's possible to compare on multiple fields using thenComparing methods.

Arrays.sort(bookArray, Comparator.comparing(Book::getName)
      .thenComparing(Book::getAuthor))
      .thenComparingInt(Book::getId));

Any way to write a Windows .bat file to kill processes?

Here I wrote an example command that you can paste in your cmd command line prompt and is written for chrome.exe.

FOR /F "tokens=2 delims= " %P IN ('tasklist /FO Table /M "chrome*" /NH') DO (TASKKILL /PID %P)

The for just takes all the PIDs listed on the below tasklist command and executes TASKKILL /PID on every PID

tasklist /FO Table /M "chrome*" /NH

If you use the for in a batch file just use %%P instead of %P

How to custom switch button?

With the Material Components Library you can use the MaterialButtonToggleGroup:

        <com.google.android.material.button.MaterialButtonToggleGroup
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:checkedButton="@id/b1"
            app:selectionRequired="true"
            app:singleSelection="true">

            <Button
                style="?attr/materialButtonOutlinedStyle"
                android:id="@+id/b1"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="wrap_content"
                android:text="OPT1" />

            <Button
                style="?attr/materialButtonOutlinedStyle"
                android:id="@+id/b2"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="wrap_content"
                android:text="OPT2" />

        </com.google.android.material.button.MaterialButtonToggleGroup>

import httplib ImportError: No module named httplib

If you use PyCharm, please change you 'Project Interpreter' to '2.7.x'

How to show the "Are you sure you want to navigate away from this page?" when changes committed?

Based on all the answers on this thread, I wrote the following code and it worked for me.

If you have only some input/textarea tags which requires an onunload event to be checked, you can assign HTML5 data-attributes as data-onunload="true"

for eg.

<input type="text" data-onunload="true" />
<textarea data-onunload="true"></textarea>

and the Javascript (jQuery) can look like this :

$(document).ready(function(){
    window.onbeforeunload = function(e) {
        var returnFlag = false;
        $('textarea, input').each(function(){
            if($(this).attr('data-onunload') == 'true' && $(this).val() != '')
                returnFlag = true;
        });

        if(returnFlag)
            return "Sure you want to leave?";   
    };
});

Understanding generators in Python

First of all, the term generator originally was somewhat ill-defined in Python, leading to lots of confusion. You probably mean iterators and iterables (see here). Then in Python there are also generator functions (which return a generator object), generator objects (which are iterators) and generator expressions (which are evaluated to a generator object).

According to the glossary entry for generator it seems that the official terminology is now that generator is short for "generator function". In the past the documentation defined the terms inconsistently, but fortunately this has been fixed.

It might still be a good idea to be precise and avoid the term "generator" without further specification.

Copy Files from Windows to the Ubuntu Subsystem

You should be able to access your windows system under the /mnt directory. For example inside of bash, use this to get to your pictures directory:

cd /mnt/c/Users/<ubuntu.username>/Pictures

Hope this helps!

How to calculate an angle from three points?

The best way to deal with angle computation is to use atan2(y, x) that given a point x, y returns the angle from that point and the X+ axis in respect to the origin.

Given that the computation is

double result = atan2(P3.y - P1.y, P3.x - P1.x) -
                atan2(P2.y - P1.y, P2.x - P1.x);

i.e. you basically translate the two points by -P1 (in other words you translate everything so that P1 ends up in the origin) and then you consider the difference of the absolute angles of P3 and of P2.

The advantages of atan2 is that the full circle is represented (you can get any number between -p and p) where instead with acos you need to handle several cases depending on the signs to compute the correct result.

The only singular point for atan2 is (0, 0)... meaning that both P2 and P3 must be different from P1 as in that case doesn't make sense to talk about an angle.

403 Forbidden vs 401 Unauthorized HTTP responses

Assuming HTTP authentication (WWW-Authenticate and Authorization headers) is in use, if authenticating as another user would grant access to the requested resource, then 401 Unauthorized should be returned.

403 Forbidden is used when access to the resource is forbidden to everyone or restricted to a given network or allowed only over SSL, whatever as long as it is no related to HTTP authentication.

If HTTP authentication is not in use and the service a cookie-based authentication scheme as is the norm nowadays, then a 403 or a 404 should be returned.

Regarding 401, this is from RFC 7235 (Hypertext Transfer Protocol (HTTP/1.1): Authentication):

3.1. 401 Unauthorized

The 401 (Unauthorized) status code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource. The origin server MUST send a WWW-Authenticate header field (Section 4.4) containing at least one challenge applicable to the target resource. If the request included authentication credentials, then the 401 response indicates that authorization has been refused for those credentials. The client MAY repeat the request with a new or replaced Authorization header field (Section 4.1). If the 401 response contains the same challenge as the prior response, and the user agent has already attempted authentication at least once, then the user agent SHOULD present the enclosed representation to the user, since it usually contains relevant diagnostic information.

The semantics of 403 (and 404) have changed over time. This is from 1999 (RFC 2616):

10.4.4 403 Forbidden

The server understood the request, but is refusing to fulfill it.
Authorization will not help and the request SHOULD NOT be repeated.
If the request method was not HEAD and the server wishes to make
public why the request has not been fulfilled, it SHOULD describe the reason for the refusal in the entity. If the server does not wish to make this information available to the client, the status code 404
(Not Found) can be used instead.

In 2014 RFC 7231 (Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content) changed the meaning of 403:

6.5.3. 403 Forbidden

The 403 (Forbidden) status code indicates that the server understood the request but refuses to authorize it. A server that wishes to make public why the request has been forbidden can describe that reason in the response payload (if any).

If authentication credentials were provided in the request, the
server considers them insufficient to grant access. The client
SHOULD NOT automatically repeat the request with the same
credentials. The client MAY repeat the request with new or different credentials. However, a request might be forbidden for reasons
unrelated to the credentials.

An origin server that wishes to "hide" the current existence of a
forbidden target resource MAY instead respond with a status code of
404 (Not Found).

Thus, a 403 (or a 404) might now mean about anything. Providing new credentials might help... or it might not.

I believe the reason why this has changed is RFC 2616 assumed HTTP authentication would be used when in practice today's Web apps build custom authentication schemes using for example forms and cookies.

JavaScript, get date of the next day

Copy-pasted from here: Incrementing a date in JavaScript

Three options for you:

Using just JavaScript's Date object (no libraries):
var today = new Date();
var tomorrow = new Date(today.getTime() + (24 * 60 * 60 * 1000));
Or if you don't mind changing the date in place (rather than creating a new date):
var dt = new Date();
dt.setTime(dt.getTime() + (24 * 60 * 60 * 1000));
Edit: See also Jigar's answer and David's comment below: var tomorrow = new Date(); tomorrow.setDate(tomorrow.getDate() + 1);

Using MomentJS:
var today = moment();
var tomorrow = moment(today).add(1, 'days');
(Beware that add modifies the instance you call it on, rather than returning a new instance, so today.add(1, 'days') would modify today. That's why we start with a cloning op on var tomorrow = ....)

Using DateJS, but it hasn't been updated in a long time:
var today = new Date(); // Or Date.today()
var tomorrow = today.add(1).day();

Correct way to work with vector of arrays

There is no error in the following piece of code:

float arr[4];
arr[0] = 6.28;
arr[1] = 2.50;
arr[2] = 9.73;
arr[3] = 4.364;
std::vector<float*> vec = std::vector<float*>();
vec.push_back(arr);
float* ptr = vec.front();
for (int i = 0; i < 3; i++)
    printf("%g\n", ptr[i]);

OUTPUT IS:

6.28

2.5

9.73

4.364

IN CONCLUSION:

std::vector<double*>

is another possibility apart from

std::vector<std::array<double, 4>>

that James McNellis suggested.

Change the Theme in Jupyter Notebook?

This is easy to do using the jupyter-themes package by Kyle Dunovan. You may be able to install it using conda. Otherwise, you will need to use pip.

Install it with conda:

conda install -c conda-forge jupyterthemes

or pip:

pip install jupyterthemes

You can get the list of available themes with:

jt -l

So change your theme with:

jt -t theme-name

To load a theme, finally, reload the page. The docs and source code are here.

Spring @Value is not resolving to value from property file

I also found the reason @value was not working is, @value requires PropertySourcesPlaceholderConfigurer instead of a PropertyPlaceholderConfigurer. i did the same changes and it worked for me, i am using spring 4.0.3 release. I configured this using below code in my configuration file -

@Bean 
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
return new PropertySourcesPlaceholderConfigurer();
}

Remove element from JSON Object

JSfiddle

function deleteEmpty(obj){
        for(var k in obj)
         if(k == "children"){
             if(obj[k]){
                     deleteEmpty(obj[k]);
             }else{
                   delete obj.children;
              } 
         }
    }

for(var i=0; i< a.children.length; i++){
 deleteEmpty(a.children[i])
}

HTML SELECT - Change selected option by VALUE using JavaScript

document.getElementById('drpSelectSourceLibrary').value = 'Seven';

jQuery object equality

Since jQuery 1.6, you can use .is. Below is the answer from over a year ago...

var a = $('#foo');
var b = a;


if (a.is(b)) {
    // the same object!
}

If you want to see if two variables are actually the same object, eg:

var a = $('#foo');
var b = a;

...then you can check their unique IDs. Every time you create a new jQuery object it gets an id.

if ($.data(a) == $.data(b)) {
    // the same object!
}

Though, the same could be achieved with a simple a === b, the above might at least show the next developer exactly what you're testing for.

In any case, that's probably not what you're after. If you wanted to check if two different jQuery objects contain the same set of elements, the you could use this:

$.fn.equals = function(compareTo) {
  if (!compareTo || this.length != compareTo.length) {
    return false;
  }
  for (var i = 0; i < this.length; ++i) {
    if (this[i] !== compareTo[i]) {
      return false;
    }
  }
  return true;
};

_Source

var a = $('p');
var b = $('p');
if (a.equals(b)) {
    // same set
}

Multiple conditions with CASE statements

It's not a cut and paste. The CASE expression must return a value, and you are returning a string containing SQL (which is technically a value but of a wrong type). This is what you wanted to write, I think:

SELECT * FROM [Purchasing].[Vendor] WHERE  
CASE
  WHEN @url IS null OR @url = '' OR @url = 'ALL'
    THEN PurchasingWebServiceURL LIKE '%'
  WHEN @url = 'blank'
    THEN PurchasingWebServiceURL = ''
  WHEN @url = 'fail'
    THEN PurchasingWebServiceURL NOT LIKE '%treyresearch%'
  ELSE PurchasingWebServiceURL = '%' + @url + '%' 
END

I also suspect that this might not work in some dialects, but can't test now (Oracle, I'm looking at you), due to not having booleans.

However, since @url is not dependent on the table values, why not make three different queries, and choose which to evaluate based on your parameter?

Copy to Clipboard for all Browsers using javascript

For security reasons most browsers do not allow to modify the clipboard (except IE, of course...).

The only way to make a copy-to-clipboard function cross-browser compatible is to use Flash.

how to use getSharedPreferences in android

First get the instance of SharedPreferences using

SharedPreferences userDetails = context.getSharedPreferences("userdetails", MODE_PRIVATE);

Now to save the values in the SharedPreferences

Editor edit = userDetails.edit();
edit.putString("username", username.getText().toString().trim());
edit.putString("password", password.getText().toString().trim());
edit.apply();

Above lines will write username and password to preference

Now to to retrieve saved values from preference, you can follow below lines of code

String userName = userDetails.getString("username", "");
String password = userDetails.getString("password", "");

(NOTE: SAVING PASSWORD IN THE APP IS NOT RECOMMENDED. YOU SHOULD EITHER ENCRYPT THE PASSWORD BEFORE SAVING OR SKIP THE SAVING THE PASSWORD)

React router nav bar example

Note The accepted is perfectly fine - but wanted to add a version4 example because they are different enough.

Nav.js

  import React from 'react';
  import { Link } from 'react-router';

  export default class Nav extends React.Component {
    render() {    
      return (
        <nav className="Nav">
          <div className="Nav__container">
            <Link to="/" className="Nav__brand">
              <img src="logo.svg" className="Nav__logo" />
            </Link>

            <div className="Nav__right">
              <ul className="Nav__item-wrapper">
                <li className="Nav__item">
                  <Link className="Nav__link" to="/path1">Link 1</Link>
                </li>
                <li className="Nav__item">
                  <Link className="Nav__link" to="/path2">Link 2</Link>
                </li>
                <li className="Nav__item">
                  <Link className="Nav__link" to="/path3">Link 3</Link>
                </li>
              </ul>
            </div>
          </div>
        </nav>
      );
    }
  }

App.js

  import React from 'react';
  import { Link, Switch, Route } from 'react-router';
  import Nav from './nav';
  import Page1 from './page1';
  import Page2 from './page2';
  import Page3 from './page3';

  export default class App extends React.Component {
    render() {    
      return (
        <div className="App">
          <Router>
            <div>
              <Nav />
              <Switch>
                <Route exactly component={Landing} pattern="/" />
                <Route exactly component={Page1} pattern="/path1" />
                <Route exactly component={Page2} pattern="/path2" />
                <Route exactly component={Page3} pattern="/path3" />
                <Route component={Page404} />
              </Switch>
            </div>
          </Router>
        </div>
      );
    }
  }

Alternatively, if you want a more dynamic nav, you can look at the excellent v4 docs: https://reacttraining.com/react-router/web/example/sidebar

Edit

A few people have asked about a page without the Nav, such as a login page. I typically approach it with a wrapper Route component

  import React from 'react';
  import { Link, Switch, Route } from 'react-router';
  import Nav from './nav';
  import Page1 from './page1';
  import Page2 from './page2';
  import Page3 from './page3';

  const NavRoute = ({exact, path, component: Component}) => (
    <Route exact={exact} path={path} render={(props) => (
      <div>
        <Header/>
        <Component {...props}/>
      </div>
    )}/>
  )

  export default class App extends React.Component {
    render() {    
      return (
        <div className="App">
          <Router>
              <Switch>
                <NavRoute exactly component={Landing} pattern="/" />
                <Route exactly component={Login} pattern="/login" />
                <NavRoute exactly component={Page1} pattern="/path1" />
                <NavRoute exactly component={Page2} pattern="/path2" />
                <NavRoute component={Page404} />
              </Switch>
          </Router>
        </div>
      );
    }
  }

When to use CouchDB over MongoDB and vice versa

Be aware of an issue with sparse unique indexes in MongoDB. I've hit it and it is extremely cumbersome to workaround.

The problem is this - you have a field, which is unique if present and you wish to find all the objects where the field is absent. The way sparse unique indexes are implemented in Mongo is that objects where that field is missing are not in the index at all - they cannot be retrieved by a query on that field - {$exists: false} just does not work.

The only workaround I have come up with is having a special null family of values, where an empty value is translated to a special prefix (like null:) concatenated to a uuid. This is a real headache, because one has to take care of transforming to/from the empty values when writing/quering/reading. A major nuisance.

I have never used server side javascript execution in MongoDB (it is not advised anyway) and their map/reduce has awful performance when there is just one Mongo node. Because of all these reasons I am now considering to check out CouchDB, maybe it fits more to my particular scenario.

BTW, if anyone knows the link to the respective Mongo issue describing the sparse unique index problem - please share.

Google map V3 Set Center to specific Marker

This should do the trick!

google.maps.event.trigger(map, "resize");
map.panTo(marker.getPosition());
map.setZoom(14);

You will need to have your maps global

How to append elements at the end of ArrayList in Java?

import java.util.*;


public class matrixcecil {
    public static void main(String args[]){
        List<Integer> k1=new ArrayList<Integer>(10);
        k1.add(23);
        k1.add(10);
        k1.add(20);
        k1.add(24);
        int i=0;
        while(k1.size()<10){
            if(i==(k1.get(k1.size()-1))){

            }
             i=k1.get(k1.size()-1);
             k1.add(30);
             i++;
             break;
        }
        System.out.println(k1);
    }

}

I think this example will help you for better solution.

Bash command to sum a column of numbers

Does two lines count?

awk '{ sum += $1; }
     END { print sum; }' "$@"

You can then use it without the superfluous 'cat':

sum < FileWithColumnOfNumbers.txt
sum   FileWithColumnOfNumbers.txt

FWIW: on MacOS X, you can do it with a one-liner:

awk '{ sum += $1; } END { print sum; }' "$@"

If Else in LINQ

my example:

 companyNamesFirst = this.model.CustomerDisplayList.Where(a => a.CompanyFirst != null ? a.CompanyFirst.StartsWith(typedChars.ToLower())) : false).Select(b => b.CompanyFirst).Distinct().ToList();

Error message "Strict standards: Only variables should be passed by reference"

Consider the following code:

error_reporting(E_STRICT);
class test {
    function test_arr(&$a) {
        var_dump($a);
    }
    function get_arr() {
        return array(1, 2);
    }
}

$t = new test;
$t->test_arr($t->get_arr());

This will generate the following output:

Strict Standards: Only variables should be passed by reference in `test.php` on line 14
array(2) {
  [0]=>
  int(1)
  [1]=>
  int(2)
}

The reason? The test::get_arr() method is not a variable and under strict mode this will generate a warning. This behavior is extremely non-intuitive as the get_arr() method returns an array value.

To get around this error in strict mode, either change the signature of the method so it doesn't use a reference:

function test_arr($a) {
    var_dump($a);
}

Since you can't change the signature of array_shift you can also use an intermediate variable:

$inter = get_arr();
$el = array_shift($inter);

Getting rid of all the rounded corners in Twitter Bootstrap

If you are using Bootstrap version < 3...

With sass/scss

$baseBorderRadius: 0;

With less

@baseBorderRadius: 0;

You will need to set this variable before importing the bootstrap. This will affect all wells and navbars.

Update

If you are using Bootstrap 3 baseBorderRadius should be border-radius-base

How can I make a link from a <td> table cell

You can creat the table you want, save it as an image and then use an image map to creat the link (this way you can put the coords of the hole td to make it in to a link).

Properties order in Margin

<object Margin="left,top,right,bottom"/>
- or - 
<object Margin="left,top"/>
- or - 
<object Margin="thicknessReference"/>

See here: http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.margin.aspx

Oracle: Import CSV file

Another solution you can use is SQL Developer.

With it, you have the ability to import from a csv file (other delimited files are available).

Just open the table view, then:

choose actions
import data
find your file
choose your options.

You have the option to have SQL Developer do the inserts for you, create an sql insert script, or create the data for a SQL Loader script (have not tried this option myself).

Of course all that is moot if you can only use the command line, but if you are able to test it with SQL Developer locally, you can always deploy the generated insert scripts (for example).

Just adding another option to the 2 already very good answers.

Want to move a particular div to right

For me, I used margin-left: auto; which is more responsive with horizontal resizing.

How do I post button value to PHP?

Change the type to submit and give it a name (and remove the useless onclick and flat out the 90's style uppercased tags/attributes).

<input type="submit" name="foo" value="A" />
<input type="submit" name="foo" value="B" />
...

The value will be available by $_POST['foo'] (if the parent <form> has a method="post").

How to create enum like type in TypeScript?

Just another note that you can a id/string enum with the following:

class EnumyObjects{
    public static BOUNCE={str:"Bounce",id:1};
    public static DROP={str:"Drop",id:2};
    public static FALL={str:"Fall",id:3};


}

AJAX Mailchimp signup form integration

Based on gbinflames' answer, this is what worked for me:

Generate a simple mailchimp list sign up form , copy the action URL and method (post) to your custom form. Also rename your form field names to all capital ( name='EMAIL' as in original mailchimp code, EMAIL,FNAME,LNAME,... ), then use this:

      $form=$('#your-subscribe-form'); // use any lookup method at your convenience

      $.ajax({
      type: $form.attr('method'),
      url: $form.attr('action').replace('/post?', '/post-json?').concat('&c=?'),
      data: $form.serialize(),
      timeout: 5000, // Set timeout value, 5 seconds
      cache       : false,
      dataType    : 'jsonp',
      contentType: "application/json; charset=utf-8",
      error       : function(err) { // put user friendly connection error message  },
      success     : function(data) {
          if (data.result != "success") {
              // mailchimp returned error, check data.msg
          } else {
              // It worked, carry on...
          }
      }

Difference between java.lang.RuntimeException and java.lang.Exception

Proper use of RuntimeException?

From Unchecked Exceptions -- The Controversy:

If a client can reasonably be expected to recover from an exception, make it a checked exception. If a client cannot do anything to recover from the exception, make it an unchecked exception.

Note that an unchecked exception is one derived from RuntimeException and a checked exception is one derived from Exception.

Why throw a RuntimeException if a client cannot do anything to recover from the exception? The article explains:

Runtime exceptions represent problems that are the result of a programming problem, and as such, the API client code cannot reasonably be expected to recover from them or to handle them in any way. Such problems include arithmetic exceptions, such as dividing by zero; pointer exceptions, such as trying to access an object through a null reference; and indexing exceptions, such as attempting to access an array element through an index that is too large or too small.

Blocking device rotation on mobile web pages

_x000D_

#rotate-device {_x000D_
    width: 100%;_x000D_
    height: 100%;_x000D_
    position: fixed;_x000D_
    z-index: 9999;_x000D_
    top: 0;_x000D_
    left: 0;_x000D_
    background-color: #000;_x000D_
    background-image: url(/path to img/rotate.png);_x000D_
    background-size: 100px 100px;_x000D_
    background-position: center;_x000D_
    background-repeat: no-repeat;_x000D_
    display: none;_x000D_
}_x000D_
_x000D_
@media only screen and (max-device-width: 667px) and (min-device-width: 320px) and (orientation: landscape){_x000D_
 #rotate-device {_x000D_
  display: block;_x000D_
 }_x000D_
}

_x000D_

<div id="rotate-device"></div>

_x000D_

Efficient way to insert a number into a sorted array of numbers?

function insertOrdered(array, elem) {
    let _array = array;
    let i = 0;
    while ( i < array.length && array[i] < elem ) {i ++};
    _array.splice(i, 0, elem);
    return _array;
}

Can you create nested WITH clauses for Common Table Expressions?

These answers are pretty good, but as far as getting the items to order properly, you'd be better off looking at this article http://dataeducation.com/dr-output-or-how-i-learned-to-stop-worrying-and-love-the-merge

Here's an example of his query.

WITH paths AS ( 
    SELECT 
        EmployeeID, 
        CONVERT(VARCHAR(900), CONCAT('.', EmployeeID, '.')) AS FullPath 
    FROM EmployeeHierarchyWide 
    WHERE ManagerID IS NULL

    UNION ALL

    SELECT 
        ehw.EmployeeID, 
        CONVERT(VARCHAR(900), CONCAT(p.FullPath, ehw.EmployeeID, '.')) AS FullPath 
    FROM paths AS p 
        JOIN EmployeeHierarchyWide AS ehw ON ehw.ManagerID = p.EmployeeID 
) 
SELECT * FROM paths order by FullPath

Show DataFrame as table in iPython Notebook

To display dataframes contained in a list:

display(*dfs)

Moq, SetupGet, Mocking a property

But while mocking read-only properties means properties with getter method only you should declare it as virtual otherwise System.NotSupportedException will be thrown because it is only supported in VB as moq internally override and create proxy when we mock anything.

javascript: get a function's variable's value within another function

Your nameContent scope is only inside first function. You'll never get it's value that way.

var nameContent; // now it's global!
function first(){
    nameContent = document.getElementById('full_name').value;
}

function second() {
    first(); 
    y=nameContent; 
    alert(y);
}
second();

Programmatically getting the MAC of an Android device

You can no longer get the hardware MAC address of a android device. WifiInfo.getMacAddress() and BluetoothAdapter.getAddress() methods will return 02:00:00:00:00:00. This restriction was introduced in Android 6.0.

But Rob Anderson found a solution which is working for < Marshmallow : https://stackoverflow.com/a/35830358

Set today's date as default date in jQuery UI datepicker

Try this:

$('.datepicker').datepicker('update', new Date(year,month,day));

How do I split a string into an array of characters?

It's as simple as:

s.split("");

The delimiter is an empty string, hence it will break up between each single character.

Stop MySQL service windows

On windows 10

If you wanna close it open command prompt with work with admin. Write NET STOP MySQL80. Its done. If you wanna open again so you must write NET START MySQL80

If you do not want it to be turned on automatically when not in use, it automatically runs when the computer is turned on and consumes some ram.

Open services.msc find Mysql80 , look at properties and turn start type manuel or otomaticly again as you wish.

Eclipse comment/uncomment shortcut?

Single line comment Ctrl + /
Single line uncomment Ctrl + /

Multiline comment Ctrl + Shift + /
Multiline uncomment Ctrl + Shift + \ (note the backslash)

Download File Using jQuery

Using jQuery function

    var valFileDownloadPath = 'http//:'+'your url';

   window.open(valFileDownloadPath , '_blank');

Why can't radio buttons be "readonly"?

Try the attribute disabled, but I think the you won't get the value of the radio buttons. Or set images instead like:

<img src="itischecked.gif" alt="[x]" />radio button option

Best Regards.

best way to preserve numpy arrays on disk

Another possibility to store numpy arrays efficiently is Bloscpack:

#!/usr/bin/python
import numpy as np
import bloscpack as bp
import time

n = 10000000

a = np.arange(n)
b = np.arange(n) * 10
c = np.arange(n) * -0.5
tsizeMB = sum(i.size*i.itemsize for i in (a,b,c)) / 2**20.

blosc_args = bp.DEFAULT_BLOSC_ARGS
blosc_args['clevel'] = 6
t = time.time()
bp.pack_ndarray_file(a, 'a.blp', blosc_args=blosc_args)
bp.pack_ndarray_file(b, 'b.blp', blosc_args=blosc_args)
bp.pack_ndarray_file(c, 'c.blp', blosc_args=blosc_args)
t1 = time.time() - t
print "store time = %.2f (%.2f MB/s)" % (t1, tsizeMB / t1)

t = time.time()
a1 = bp.unpack_ndarray_file('a.blp')
b1 = bp.unpack_ndarray_file('b.blp')
c1 = bp.unpack_ndarray_file('c.blp')
t1 = time.time() - t
print "loading time = %.2f (%.2f MB/s)" % (t1, tsizeMB / t1)

and the output for my laptop (a relatively old MacBook Air with a Core2 processor):

$ python store-blpk.py
store time = 0.19 (1216.45 MB/s)
loading time = 0.25 (898.08 MB/s)

that means that it can store really fast, i.e. the bottleneck is typically the disk. However, as the compression ratios are pretty good here, the effective speed is multiplied by the compression ratios. Here are the sizes for these 76 MB arrays:

$ ll -h *.blp
-rw-r--r--  1 faltet  staff   921K Mar  6 13:50 a.blp
-rw-r--r--  1 faltet  staff   2.2M Mar  6 13:50 b.blp
-rw-r--r--  1 faltet  staff   1.4M Mar  6 13:50 c.blp

Please note that the use of the Blosc compressor is fundamental for achieving this. The same script but using 'clevel' = 0 (i.e. disabling compression):

$ python bench/store-blpk.py
store time = 3.36 (68.04 MB/s)
loading time = 2.61 (87.80 MB/s)

is clearly bottlenecked by the disk performance.

Using "word-wrap: break-word" within a table

You can try this:

td p {word-break:break-all;}

This, however, makes it appear like this when there's enough space, unless you add a <br> tag:

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

So, I would then suggest adding <br> tags where there are newlines, if possible.

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

http://jsfiddle.net/LLyH3/3/

Also, if this doesn't solve your problem, there's a similar thread here.

Creating a LINQ select from multiple tables

If the anonymous type causes trouble for you, you can create a simple data class:

public class PermissionsAndPages
{
     public ObjectPermissions Permissions {get;set}
     public Pages Pages {get;set}
}

and then in your query:

select new PermissionsAndPages { Permissions = op, Page = pg };

Then you can pass this around:

return queryResult.SingleOrDefault(); // as PermissionsAndPages

Best way to convert IList or IEnumerable to Array

Put the following in your .cs file:

using System.Linq;

You will then be able to use the following extension method from System.Linq.Enumerable:

public static TSource[] ToArray<TSource>(this System.Collections.Generic.IEnumerable<TSource> source)

I.e.

IEnumerable<object> query = ...;
object[] bob = query.ToArray();

How to pass a datetime parameter?

One possible solution is to use Ticks:

public long Ticks { get; }

Then in the controller's method:

public DateTime(long ticks);

Check if all values in list are greater than a certain number

I write this function

def larger(x, than=0):
    if not x or min(x) > than:
        return True
    return False

Then

print larger([5, 6, 7], than=5)  # False
print larger([6, 7, 8], than=5)  # True
print larger([], than=5)  # True
print larger([6, 7, 8, None], than=5)  # False

Empty list on min() will raise ValueError. So I added if not x in condition.

Print "\n" or newline characters as part of the output on terminal

If you're in control of the string, you could also use a 'Raw' string type:

>>> string = r"abcd\n"
>>> print(string)
abcd\n

How to strip comma in Python string

You want to replace it, not strip it:

s = s.replace(',', '')

Get selected text from a drop-down list (select box) using jQuery

Various ways

1. $("#myselect option:selected").text();

2. $("#myselect :selected").text();

3. $("#myselect").children(":selected").text();

4. $("#myselect").find(":selected").text();

How to change the session timeout in PHP?

Put $_SESSION['login_time'] = time(); into the previous authentication page. And the snipped below in every other page where you want to check the session time-out.

if(time() - $_SESSION['login_time'] >= 1800){
    session_destroy(); // destroy session.
    header("Location: logout.php");
    die(); // See https://thedailywtf.com/articles/WellIntentioned-Destruction
    //redirect if the page is inactive for 30 minutes
}
else {        
   $_SESSION['login_time'] = time();
   // update 'login_time' to the last time a page containing this code was accessed.
}

Edit : This only works if you already used the tweaks in other posts, or disabled Garbage Collection, and want to manually check the session duration. Don't forget to add die() after a redirect, because some scripts/robots might ignore it. Also, directly destroying the session with session_destroy() instead of relying on a redirect for that might be a better option, again, in case of a malicious client or a robot.

Make first letter of a string upper case (with maximum performance)

This capitalizes this first letter and every letter following a space and lower cases any other letter.

public string CapitalizeFirstLetterAfterSpace(string input)
{
    System.Text.StringBuilder sb = new System.Text.StringBuilder(input);
    bool capitalizeNextLetter = true;
    for(int pos = 0; pos < sb.Length; pos++)
    {
        if(capitalizeNextLetter)
        {
            sb[pos]=System.Char.ToUpper(sb[pos]);
            capitalizeNextLetter = false;
        }
        else
        {
            sb[pos]=System.Char.ToLower(sb[pos]);
        }

        if(sb[pos]=' ')
        {
            capitalizeNextLetter=true;
        }
    }
}

JQuery confirm dialog

You can use jQuery UI and do something like this

Html:

<button id="callConfirm">Confirm!</button>

<div id="dialog" title="Confirmation Required">
  Are you sure about this?
</div>?

Javascript:

$("#dialog").dialog({
   autoOpen: false,
   modal: true,
   buttons : {
        "Confirm" : function() {
            alert("You have confirmed!");            
        },
        "Cancel" : function() {
          $(this).dialog("close");
        }
      }
    });

$("#callConfirm").on("click", function(e) {
    e.preventDefault();
    $("#dialog").dialog("open");
});

Read text file into string. C++ ifstream

To read a whole line from a file into a string, use std::getline like so:

 std::ifstream file("my_file");
 std::string temp;
 std::getline(file, temp);

You can do this in a loop to until the end of the file like so:

 std::ifstream file("my_file");
 std::string temp;
 while(std::getline(file, temp)) {
      //Do with temp
 }

References

http://en.cppreference.com/w/cpp/string/basic_string/getline

http://en.cppreference.com/w/cpp/string/basic_string

pip install - locale.Error: unsupported locale setting

The error message indicates a problem with the locale setting. To fix this as indicated by other answers you need to modify your locale.

On Mac OS X Sierra I found that the best way to do this was to modify the ~/bash_profile file as follows:

export LANG="en_US.UTF-8"
export LC_ALL="en_US.UTF-8"
export LC_CTYPE="en_US.UTF-8"

This change will not be immediately evident in your current cli session unless you reload the bash profile by using: source ~/.bash_profile.

This answer is pretty close to answers that I've posted to other non-identical, non-duplicate questions (i.e. not related to pipenv) but which happen to require the same solution.

To the moderator: With respect; my previous answer got deleted for this reason but I feel that was a bit silly because really this answer applies almost whenever the error is "problem with locale"... but there are a number of differing situations, languages, and environments which could trigger that error.

Thus it A) doesn't make sense to mark the questions as duplicates and B) doesn't make sense to tailor the answer either because the fix is very simple, is the same in each case and does not benefit from ornamentation.

Populating a ListView using an ArrayList?

tutorial

Also look up ArrayAdapter interface:

ArrayAdapter(Context context, int textViewResourceId, List<T> objects)

Open a Web Page in a Windows Batch FIle

start did not work for me.

I used:

firefox http://www.stackoverflow.com

chrome http://www.stackoverflow.com

Obviously not great for distributing it, but if you're using it for a specific machine, it should work fine.

"A namespace cannot directly contain members such as fields or methods"

The snippet you're showing doesn't seem to be directly responsible for the error.

This is how you can CAUSE the error:

namespace MyNameSpace
{
   int i; <-- THIS NEEDS TO BE INSIDE THE CLASS

   class MyClass
   {
      ...
   }
}

If you don't immediately see what is "outside" the class, this may be due to misplaced or extra closing bracket(s) }.

QComboBox - set selected item based on the item's data

You lookup the value of the data with findData() and then use setCurrentIndex()

QComboBox* combo = new QComboBox;
combo->addItem("100",100.0);    // 2nd parameter can be any Qt type
combo->addItem .....

float value=100.0;
int index = combo->findData(value);
if ( index != -1 ) { // -1 for not found
   combo->setCurrentIndex(index);
}

MySQL table is marked as crashed and last (automatic?) repair failed

If this happend to your XAMPP installation, just copy global_priv.MAD and global_priv.MAI files from ./xampp/mysql/backup/mysql/ to ./xampp/mysql/data/mysql/.

Checking if jquery is loaded using Javascript

You can check whether it exists and, if it does not exist, load it dynamically.

function loadScript(src) {
    return new Promise(function (resolve, reject) {
        var s;
        s = document.createElement('script');
        s.src = src;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
}



async function load(){
if (!window.jQuery){
    await loadScript(`https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js`);
}

console.log(jQuery);

}

load();

How should I log while using multiprocessing in Python?

For whoever might need this, I wrote a decorator for multiprocessing_logging package that adds the current process name to logs, so it becomes clear who logs what.

It also runs install_mp_handler() so it becomes unuseful to run it before creating a pool.

This allows me to see which worker creates which logs messages.

Here's the blueprint with an example:

import sys
import logging
from functools import wraps
import multiprocessing
import multiprocessing_logging

# Setup basic console logger as 'logger'
logger = logging.getLogger()
console_handler = logging.StreamHandler(sys.stdout)
console_handler.setFormatter(logging.Formatter(u'%(asctime)s :: %(levelname)s :: %(message)s'))
logger.setLevel(logging.DEBUG)
logger.addHandler(console_handler)


# Create a decorator for functions that are called via multiprocessing pools
def logs_mp_process_names(fn):
    class MultiProcessLogFilter(logging.Filter):
        def filter(self, record):
            try:
                process_name = multiprocessing.current_process().name
            except BaseException:
                process_name = __name__
            record.msg = f'{process_name} :: {record.msg}'
            return True

    multiprocessing_logging.install_mp_handler()
    f = MultiProcessLogFilter()

    # Wraps is needed here so apply / apply_async know the function name
    @wraps(fn)
    def wrapper(*args, **kwargs):
        logger.removeFilter(f)
        logger.addFilter(f)
        return fn(*args, **kwargs)

    return wrapper


# Create a test function and decorate it
@logs_mp_process_names
def test(argument):
    logger.info(f'test function called via: {argument}')


# You can also redefine undecored functions
def undecorated_function():
    logger.info('I am not decorated')


@logs_mp_process_names
def redecorated(*args, **kwargs):
    return undecorated_function(*args, **kwargs)


# Enjoy
if __name__ == '__main__':
    with multiprocessing.Pool() as mp_pool:
        # Also works with apply_async
        mp_pool.apply(test, ('mp pool',))
        mp_pool.apply(redecorated)
        logger.info('some main logs')
        test('main program')

Group by multiple field names in java 8

Hi You can simply concatenate your groupingByKey such as

Map<String, List<Person>> peopleBySomeKey = people
                .collect(Collectors.groupingBy(p -> getGroupingByKey(p), Collectors.mapping((Person p) -> p, toList())));



//write getGroupingByKey() function
private String getGroupingByKey(Person p){
return p.getAge()+"-"+p.getName();
}

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Refs

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