ActiveMQ or RabbitMQ or ZeroMQ or

There is a comparison of the features and performance of RabbitMQ ActiveMQ and QPID given at
http://bhavin.directi.com/rabbitmq-vs-apache-activemq-vs-apache-qpid/

Personally I have tried all the above three. RabbitMQ is the best performance wise according to me, but it does not have failover and recovery options. ActiveMQ has the most features, but is slower.

Update : HornetQ is also an option you can look into, it is JMS Complaint, a better option than ActiveMQ if you are looking for a JMS based solution.

Cannot find the declaration of element 'beans'

Found it on another thread that solved my problem... was using an internet connection less network.

In that case copy the xsd files from the url and place it next to the beans.xml file and change the xsi:schemaLocation as under:

 <beans xmlns="http://www.springframework.org/schema/beans" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
spring-beans-3.1.xsd">

When to use RabbitMQ over Kafka?

The short answer is "message acknowledgements". RabbitMQ can be configured to require message acknowledgements. If a receiver fails the message goes back on the queue and another receiver can try again. While you can accomplish this in Kafka with your own code, it works with RabbitMQ out of the box.

In my experience, if you have an application that has requirements to query a stream of information, Kafka and KSql are your best bet. If you want a queueing system you are better off with RabbitMQ.

Message Queue vs. Web Services?

Message queues are ideal for requests which may take a long time to process. Requests are queued and can be processed offline without blocking the client. If the client needs to be notified of completion, you can provide a way for the client to periodically check the status of the request.

Message queues also allow you to scale better across time. It improves your ability to handle bursts of heavy activity, because the actual processing can be distributed across time.

Note that message queues and web services are orthogonal concepts, i.e. they are not mutually exclusive. E.g. you can have a XML based web service which acts as an interface to a message queue. I think the distinction your looking for is Message Queues versus Request/Response, the latter is when the request is processed synchronously.

What are good message queue options for nodejs?

Shameless plug: I'm working on Bokeh: a simple, scalable and blazing-fast task queue built on ZeroMQ. It supports pluggable data stores for persisting tasks, currently in-memory, Redis and Riak are supported. Check it out.

Real world use of JMS/message queues?

We are using JMS for communication with systems in a huge number of remote sites over unreliable networks. The loose coupling in combination with reliable messaging produces a stable system landscape: Each message will be sent as soon it is technically possible, bigger problems in network will not have influence on the whole system landscape...

Styling HTML5 input type number

HTML5 number input doesn't have styles attributes like width or size, but you can style it easily with CSS.

input[type="number"] {
   width:50px;
}

Include another HTML file in a HTML file

Another approach using Fetch API with Promise

<html>
 <body>
  <div class="root" data-content="partial.html">
  <script>
      const root = document.querySelector('.root')
      const link = root.dataset.content;

      fetch(link)
        .then(function (response) {
          return response.text();
        })
        .then(function (html) {
          root.innerHTML = html;
        });
  </script>
 </body>
</html>

Turn a single number into single digits Python

This can be done quite easily if you:

Use str to convert the number into a string so that you can iterate over it.
Use a list comprehension to split the string into individual digits.
Use int to convert the digits back into integers.

Below is a demonstration:

>>> n = 43365644
>>> [int(d) for d in str(n)]
[4, 3, 3, 6, 5, 6, 4, 4]
>>>

mysql: get record count between two date-time

select * from yourtable 
   where created < now() 
     and created > concat(curdate(),' 4:30:00 AM')

Check if a string contains a number

Also, you could use regex findall. It's a more general solution since it adds more control over the length of the number. It could be helpful in cases where you require a number with minimal length.

True if len(''.join(re.findall('\d+', '67389kjsdk'))) > 0 else False

Hope it helps some else.

How to filter input type="file" dialog by specific file type?

You can use the accept attribute along with the . It doesn't work in IE and Safari.

Depending on your project scale and extensibility, you could use Struts. Struts offers two ways to limit the uploaded file type, declaratively and programmatically.

For more information: http://struts.apache.org/2.0.14/docs/file-upload.html#FileUpload-FileTypes

Why does range(start, end) not include end?

Because it's more common to call range(0, 10) which returns [0,1,2,3,4,5,6,7,8,9] which contains 10 elements which equals len(range(0, 10)). Remember that programmers prefer 0-based indexing.

Also, consider the following common code snippet:

for i in range(len(li)):
    pass

Could you see that if range() went up to exactly len(li) that this would be problematic? The programmer would need to explicitly subtract 1. This also follows the common trend of programmers preferring for(int i = 0; i < 10; i++) over for(int i = 0; i <= 9; i++).

If you are calling range with a start of 1 frequently, you might want to define your own function:

>>> def range1(start, end):
...     return range(start, end+1)
...
>>> range1(1, 10)
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Asp.net 4.0 has not been registered

I repaired it using the Microsoft .NET Framework Repair Tool. After reloading my project a couple of times after that the problem went away.

How can I remove an element from a list?

I don't know R at all, but a bit of creative googling led me here: http://tolstoy.newcastle.edu.au/R/help/05/04/1919.html

The key quote from there:

I do not find explicit documentation for R on how to remove elements from lists, but trial and error tells me

myList[[5]] <- NULL

will remove the 5th element and then "close up" the hole caused by deletion of that element. That suffles the index values, So I have to be careful in dropping elements. I must work from the back of the list to the front.

A response to that post later in the thread states:

For deleting an element of a list, see R FAQ 7.1

And the relevant section of the R FAQ says:

... Do not set x[i] or x[[i]] to NULL, because this will remove the corresponding component from the list.

Which seems to tell you (in a somewhat backwards way) how to remove an element.

Hope that helps, or at least leads you in the right direction.

JS: Uncaught TypeError: object is not a function (onclick)

I was able to figure it out by following the answer in this thread: https://stackoverflow.com/a/8968495/1543447

Basically, I renamed all values, function names, and element names to different values so they wouldn't conflict - and it worked!

C++11 rvalues and move semantics confusion (return statement)

Not an answer per se, but a guideline. Most of the time there is not much sense in declaring local T&& variable (as you did with std::vector<int>&& rval_ref). You will still have to std::move() them to use in foo(T&&) type methods. There is also the problem that was already mentioned that when you try to return such rval_ref from function you will get the standard reference-to-destroyed-temporary-fiasco.

Most of the time I would go with following pattern:

// Declarations
A a(B&&, C&&);
B b();
C c();

auto ret = a(b(), c());

You don't hold any refs to returned temporary objects, thus you avoid (inexperienced) programmer's error who wish to use a moved object.

auto bRet = b();
auto cRet = c();
auto aRet = a(std::move(b), std::move(c));

// Either these just fail (assert/exception), or you won't get 
// your expected results due to their clean state.
bRet.foo();
cRet.bar();

Obviously there are (although rather rare) cases where a function truly returns a T&& which is a reference to a non-temporary object that you can move into your object.

Regarding RVO: these mechanisms generally work and compiler can nicely avoid copying, but in cases where the return path is not obvious (exceptions, if conditionals determining the named object you will return, and probably couple others) rrefs are your saviors (even if potentially more expensive).

Connecting to Postgresql in a docker container from outside

I am using django with postgres in Docker containers. in the docker-compose file, add the following:

db:
    image: postgres:10-alpine
    environment:
        - POSTGRES_DB=app
        - POSTGRES_USER=postgres
        - POSTGRES_PASSWORD=supersecretpassword
    **ports:
        - "6543:5432"**

which will add accessible port by your local machine. for myself, I connected DBeaver to it. this will prevent port clashes between your app request and local machine request. at first, I got a message saying that the port 5432 is in use (which is by django app) so I couldn't access by pgAdmin or DBeaver.

Load dimension value from res/values/dimension.xml from source code

In my dimens.xml I have

<dimen name="test">48dp</dimen>

In code If I do

int valueInPixels = (int) getResources().getDimension(R.dimen.test)

this will return 72 which as docs state is multiplied by density of current phone (48dp x 1.5 in my case)

exactly as docs state :

Retrieve a dimensional for a particular resource ID. Unit conversions are based on the current DisplayMetrics associated with the resources.

so if you want exact dp value just as in xml just divide it with DisplayMetrics density

int dp = (int) (getResources().getDimension(R.dimen.test) / getResources().getDisplayMetrics().density)

dp will be 48 now

How to convert HTML to PDF using iTextSharp

I use the following code to create PDF

protected void CreatePDF(Stream stream)
        {
            using (var document = new Document(PageSize.A4, 40, 40, 40, 30))
            {
                var writer = PdfWriter.GetInstance(document, stream);
                writer.PageEvent = new ITextEvents();
                document.Open();

                // instantiate custom tag processor and add to `HtmlPipelineContext`.
                var tagProcessorFactory = Tags.GetHtmlTagProcessorFactory();
                tagProcessorFactory.AddProcessor(
                    new TableProcessor(),
                    new string[] { HTML.Tag.TABLE }
                );

                //Register Fonts.
                XMLWorkerFontProvider fontProvider = new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS);
                fontProvider.Register(HttpContext.Current.Server.MapPath("~/Content/Fonts/GothamRounded-Medium.ttf"), "Gotham Rounded Medium");
                CssAppliers cssAppliers = new CssAppliersImpl(fontProvider);

                var htmlPipelineContext = new HtmlPipelineContext(cssAppliers);
                htmlPipelineContext.SetTagFactory(tagProcessorFactory);

                var pdfWriterPipeline = new PdfWriterPipeline(document, writer);
                var htmlPipeline = new HtmlPipeline(htmlPipelineContext, pdfWriterPipeline);

                // get an ICssResolver and add the custom CSS
                var cssResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(true);
                cssResolver.AddCss(CSSSource, "utf-8", true);
                var cssResolverPipeline = new CssResolverPipeline(
                    cssResolver, htmlPipeline
                );

                var worker = new XMLWorker(cssResolverPipeline, true);
                var parser = new XMLParser(worker);
                using (var stringReader = new StringReader(HTMLSource))
                {
                    parser.Parse(stringReader);
                    document.Close();
                    HttpContext.Current.Response.ContentType = "application /pdf";
                    if (base.View)
                        HttpContext.Current.Response.AddHeader("content-disposition", "inline;filename=\"" + OutputFileName + ".pdf\"");
                    else
                        HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=\"" + OutputFileName + ".pdf\"");
                    HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
                    HttpContext.Current.Response.WriteFile(OutputPath);
                    HttpContext.Current.Response.End();
                }
            }
        }

Use Font Awesome Icons in CSS

For this you just need to add content attribute and font-family attribute to the required element via :before or :after wherever applicable.

For example: I wanted to attach an attachment icon after all the a element inside my post. So, first I need to search if such icon exists in fontawesome. Like in the case I found it here, i.e. fa fa-paperclip. Then I would right click the icon there, and go the ::before pseudo property to fetch out the content tag it is using, which in my case I found to be \f0c6. Then I would use that in my css like this:

   .post a:after {
     font-family: FontAwesome,
     content: " \f0c6" /* I added a space before \ for better UI */
    }

Using Python String Formatting with Lists

This was a fun question! Another way to handle this for variable length lists is to build a function that takes full advantage of the .format method and list unpacking. In the following example I don't use any fancy formatting, but that can easily be changed to suit your needs.

list_1 = [1,2,3,4,5,6]
list_2 = [1,2,3,4,5,6,7,8]

# Create a function that can apply formatting to lists of any length:
def ListToFormattedString(alist):
    # Create a format spec for each item in the input `alist`.
    # E.g., each item will be right-adjusted, field width=3.
    format_list = ['{:>3}' for item in alist] 

    # Now join the format specs into a single string:
    # E.g., '{:>3}, {:>3}, {:>3}' if the input list has 3 items.
    s = ','.join(format_list)

    # Now unpack the input list `alist` into the format string. Done!
    return s.format(*alist)

# Example output:
>>>ListToFormattedString(list_1)
'  1,  2,  3,  4,  5,  6'
>>>ListToFormattedString(list_2)
'  1,  2,  3,  4,  5,  6,  7,  8'

"ssl module in Python is not available" when installing package with pip3

If you are on Windows and use Anaconda you can try running "pip install ..." command in Anaconda Prompt instead of cmd.exe, as user willliu1995 suggests here. This was the fastest solution for me, that does not require installation of additional components.

How do I get the first n characters of a string without checking the size or going out of bounds?

Apache Commons Lang has a StringUtils.left method for this.

String upToNCharacters = StringUtils.left(s, n);

How can I remove file extension from a website address?

same as Igor but should work without line 2:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.php [NC,L]

How to delete columns in a CSV file?

You can directly delete the column with just

del variable_name['year']

text-overflow: ellipsis not working

Add this below code for where you likes to

example

p{
   display: block; /* Fallback for non-webkit */
   display: -webkit-box;
   max-width: 400px;
   margin: 0 auto;
   -webkit-line-clamp: 2;
   -webkit-box-orient: vertical;
   overflow: hidden;
   text-overflow: ellipsis;
 }

How may I align text to the left and text to the right in the same line?

If you just want to change alignment of text just make a classes

.left {
text-align: left;
}

and span that class through the text

<span class='left'>aligned left</span>

How to Define Callbacks in Android?

In many cases, you have an interface and pass along an object that implements it. Dialogs for example have the OnClickListener.

Just as a random example:

// The callback interface
interface MyCallback {
    void callbackCall();
}

// The class that takes the callback
class Worker {
   MyCallback callback;

   void onEvent() {
      callback.callbackCall();
   }
}

// Option 1:

class Callback implements MyCallback {
   void callbackCall() {
      // callback code goes here
   }
}

worker.callback = new Callback();

// Option 2:

worker.callback = new MyCallback() {

   void callbackCall() {
      // callback code goes here
   }
};

I probably messed up the syntax in option 2. It's early.

Best way to do a split pane in HTML

Here is my lightweight vanilla JavaScript approach, using Flexbox:

http://codepen.io/lingtalfi/pen/zoNeJp

It was tested successfully in Google Chrome 54, Firefox 50, Safari 10, don't know about other browsers.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.rawgit.com/lingtalfi/simpledrag/master/simpledrag.js"></script>

    <style type="text/css">

        html, body {
            height: 100%;
        }

        .panes-container {
            display: flex;
            width: 100%;
            overflow: hidden;
        }

        .left-pane {
            width: 18%;
            background: #ccc;
        }

        .panes-separator {
            width: 2%;
            background: red;
            position: relative;
            cursor: col-resize;
        }

        .right-pane {
            flex: auto;
            background: #eee;
        }

        .panes-container,
        .panes-separator,
        .left-pane,
        .right-pane {
            margin: 0;
            padding: 0;
            height: 100%;
        }

    </style>

</head>

<body>

<div class="panes-container">
    <div class="left-pane" id="left-pane">
        <p>I'm the left pane</p>
        <ul>
            <li><a href="#">Item 1</a></li>
            <li><a href="#">Item 2</a></li>
            <li><a href="#">Item 3</a></li>
        </ul>
    </div>
    <div class="panes-separator" id="panes-separator"></div>
    <div class="right-pane" id="right-pane">
        <p>And I'm the right pane</p>
        <p>
            Lorem ipsum dolor sit amet, consectetur adipisicing elit. A accusantium at cum cupiditate dolorum, eius eum
            eveniet facilis illum maiores molestiae necessitatibus optio possimus sequi sunt, vel voluptate. Asperiores,
            voluptate!
        </p>
    </div>
</div>


<script>


    var leftPane = document.getElementById('left-pane');
    var rightPane = document.getElementById('right-pane');
    var paneSep = document.getElementById('panes-separator');

    // The script below constrains the target to move horizontally between a left and a right virtual boundaries.
    // - the left limit is positioned at 10% of the screen width
    // - the right limit is positioned at 90% of the screen width
    var leftLimit = 10;
    var rightLimit = 90;


    paneSep.sdrag(function (el, pageX, startX, pageY, startY, fix) {

        fix.skipX = true;

        if (pageX < window.innerWidth * leftLimit / 100) {
            pageX = window.innerWidth * leftLimit / 100;
            fix.pageX = pageX;
        }
        if (pageX > window.innerWidth * rightLimit / 100) {
            pageX = window.innerWidth * rightLimit / 100;
            fix.pageX = pageX;
        }

        var cur = pageX / window.innerWidth * 100;
        if (cur < 0) {
            cur = 0;
        }
        if (cur > window.innerWidth) {
            cur = window.innerWidth;
        }


        var right = (100-cur-2);
        leftPane.style.width = cur + '%';
        rightPane.style.width = right + '%';

    }, null, 'horizontal');


</script>

</body>
</html>

This HTML code depends on the simpledrag vanilla JavaScript lightweight library (less than 60 lines of code).

Access props inside quotes in React JSX

you can use

<img className="image" src=`images/${this.props.image}`>

<img className="image" src={'images/'+this.props.image}>

  render() {
         let imageUrl = this.props.image ? "images/"+this.props.image : 'some placeholder url image';
    return (
       <div>
          <img className="image" src={imageUrl} />
       </div>
    )
  }

react-native: command not found

Dears,

Please try : npm install -g react-native-cli

If you get an error like Cannot find module ‘npmlog’ you can install npm directly using this command. If the above command run successfully then no need to run this command

curl -0 -L https://npmjs.org/install.sh | sudo sh

#For_Ubuntu.

Best regards.

Update .NET web service to use TLS 1.2

PowerBI Embedded requires TLS 1.2.

The answer above by Etienne Faucher is your solution. quick link to above answer... quick link to above answer... ( https://stackoverflow.com/a/45442874 )

PowerBI Requires TLS 1.2 June 2020 - This Is your Answer - Consider Forcing your IIS runtime to get up to 4.6 to force the default TLS 1.2 behavior you are looking for from the framework. The above answer gives you a config change only solution.

Symptoms: Forced Closed Rejected TCP/IP Connection to Microsoft PowerBI Embedded that just shows up all of a sudden across your systems.

These PowerBI Calls just stop working with a Hard TCP/IP Close error like a firewall would block a connection. Usually the auth steps work - it is when you hit the service for specific workspace and report id's that it fails.

This is the 2020 note from Microsoft PowerBI about TLS 1.2 required

PowerBIClient

methods that show this problem

GetReportsInGroupAsync GetReportsInGroupAsAdminAsync GetReportsAsync GetReportsAsAdminAsync Microsoft.PowerBI.Api HttpClientHandler Force TLS 1.1 TLS 1.2

Search Error Terms to help people find this: System.Net.Http.HttpRequestException: An error occurred while sending the request System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

Issue with background color and Google Chrome

Oddly enough it doesn't actually happen on every page and it doesn't seem to always work even when refreshed.

My solutions was to add {height: 100%;} as well.

What’s the difference between “{}” and “[]” while declaring a JavaScript array?

In JavaScript Arrays and Objects are actually very similar, although on the outside they can look a bit different.

For an array:

var array = [];
array[0] = "hello";
array[1] = 5498;
array[536] = new Date();

As you can see arrays in JavaScript can be sparse (valid indicies don't have to be consecutive) and they can contain any type of variable! That's pretty convenient.

But as we all know JavaScript is strange, so here are some weird bits:

array["0"] === "hello"; // This is true
array["hi"]; // undefined
array["hi"] = "weird"; // works but does not save any data to array
array["hi"]; // still undefined!

This is because everything in JavaScript is an Object (which is why you can also create an array using new Array()). As a result every index in an array is turned into a string and then stored in an object, so an array is just an object that doesn't allow anyone to store anything with a key that isn't a positive integer.

So what are Objects?

Objects in JavaScript are just like arrays but the "index" can be any string.

var object = {};
object[0] = "hello"; // OK
object["hi"] = "not weird"; // OK

You can even opt to not use the square brackets when working with objects!

console.log(object.hi); // Prints 'not weird'
object.hi = "overwriting 'not weird'";

You can go even further and define objects like so:

var newObject = {
    a: 2,
};
newObject.a === 2; // true

How to find the default JMX port number?

Now I need to connect that application from my local computer, but I don't know the JMX port number of the remote computer. Where can I find it? Or, must I restart that application with some VM parameters to specify the port number?

By default JMX does not publish on a port unless you specify the arguments from this page: How to activate JMX...

-Dcom.sun.management.jmxremote # no longer required for JDK6
-Dcom.sun.management.jmxremote.port=9010
-Dcom.sun.management.jmxremote.local.only=false # careful with security implications
-Dcom.sun.management.jmxremote.authenticate=false # careful with security implications

If you are running you should be able to access any of those system properties to see if they have been set:

if (System.getProperty("com.sun.management.jmxremote") == null) {
    System.out.println("JMX remote is disabled");
} else [
    String portString = System.getProperty("com.sun.management.jmxremote.port");
    if (portString != null) {
        System.out.println("JMX running on port "
            + Integer.parseInt(portString));
    }
}

Depending on how the server is connected, you might also have to specify the following parameter. As part of the initial JMX connection, jconsole connects up to the RMI port to determine which port the JMX server is running on. When you initially start up a JMX enabled application, it looks its own hostname to determine what address to return in that initial RMI transaction. If your hostname is not in /etc/hosts or if it is set to an incorrect interface address then you can override it with the following:

-Djava.rmi.server.hostname=<IP address>

As an aside, my SimpleJMX package allows you to define both the JMX server and the RMI port or set them both to the same port. The above port defined with com.sun.management.jmxremote.port is actually the RMI port. This tells the client what port the JMX server is running on.

Updating to latest version of CocoaPods?

Using CocoaPods with a Gemfile

With a Gemfile setup, you run bundle install to install, or bundle update to update within your Gemfile's constraints. From here on in however, you will need to remember to run bundle exec before any terminal commands that have come in via bundler. Given that CocoaPods is included in the above this means any time you would write pod XX YY you need to do bundle exec pod XX YY.

Doing it without bundle exec will bypass your Gemfile's specific versioning and will use the latest version of the library within RubyGems. This could potentially be the exact same version, but it can often not. If you are including CocoaPods plugins then they may also not be run.

This means you can be sure that foundational tooling for projects are versioned just like your personal libraries.

WCF timeout exception detailed investigation

I'm not a WCF expert but I'm wondering if you aren't running into a DDOS protection on IIS. I know from experience that if you run a bunch of simultaneous connections from a single client to a server at some point the server stops responding to the calls as it suspects a DDOS attack. It will also hold the connections open until they time-out in order to slow the client down in his attacks.

Multiple connection coming from different machines/IP's should not be a problem however.

There's more info in this MSDN post:

http://msdn.microsoft.com/en-us/library/bb463275.aspx

Check out the MaxConcurrentSession sproperty.

Android, canvas: How do I clear (delete contents of) a canvas (= bitmaps), living in a surfaceView?

Try to remove the view at onPause() of an activity and add onRestart()

LayoutYouAddedYourView.addView(YourCustomView); LayoutYouAddedYourView.removeView(YourCustomView);

The moment you add your view, onDraw() method would get called.

YourCustomView, is a class which extends the View class.

Multiple submit buttons on HTML form – designate one button as default

I'm resurrecting this because I was researching a non-JavaScript way to do this. I wasn't into the key handlers, and the CSS positioning stuff was causing tab ordering to break since CSS repositioning doesn't change tab order.

My solution is based on the response at https://stackoverflow.com/a/9491141.

The solution source is below. tabindex is used to correct tab behaviour of the hidden button, as well as aria-hidden to avoid having the button read out by screen readers / identified by assistive devices.

<form method="post" action="">
  <button type="submit" name="useraction" value="2nd" class="default-button-handler" aria-hidden="true" tabindex="-1"></button>
  <div class="form-group">
    <label for="test-input">Focus into this input: </label>
    <input type="text" id="test-input" class="form-control" name="test-input" placeholder="Focus in here and press enter / go" />
  </div>

1st button in DOM 2nd button in DOM 3rd button in DOM

Essential CSS for this solution:

.default-button-handler {
  width: 0;
  height: 0;
  padding: 0;
  border: 0;
  margin: 0;
}

How to save all files from source code of a web site?

In Chrome, go to options (Customize and Control, the 3 dots/bars at top right) ---> More Tools ---> save page as

save page as  
filename     : any_name.html 
save as type : webpage complete.

Then you will get any_name.html and any_name folder.

What are .NET Assemblies?

See this:

In the Microsoft .NET framework, an assembly is a partially compiled code library for use in deployment, versioning and security

Java HttpRequest JSON & Response Handling

The simplest way is using libraries like google-http-java-client but if you want parse the JSON response by yourself you can do that in a multiple ways, you can use org.json, json-simple, Gson, minimal-json, jackson-mapper-asl (from 1.x)... etc

A set of simple examples:

Using Gson:

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class Gson {

    public static void main(String[] args) {
    }

    public HttpResponse http(String url, String body) {

        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            HttpPost request = new HttpPost(url);
            StringEntity params = new StringEntity(body);
            request.addHeader("content-type", "application/json");
            request.setEntity(params);
            HttpResponse result = httpClient.execute(request);
            String json = EntityUtils.toString(result.getEntity(), "UTF-8");

            com.google.gson.Gson gson = new com.google.gson.Gson();
            Response respuesta = gson.fromJson(json, Response.class);

            System.out.println(respuesta.getExample());
            System.out.println(respuesta.getFr());

        } catch (IOException ex) {
        }
        return null;
    }

    public class Response{

        private String example;
        private String fr;

        public String getExample() {
            return example;
        }
        public void setExample(String example) {
            this.example = example;
        }
        public String getFr() {
            return fr;
        }
        public void setFr(String fr) {
            this.fr = fr;
        }
    }
}

Using json-simple:

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

public class JsonSimple {

    public static void main(String[] args) {

    }

    public HttpResponse http(String url, String body) {

        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            HttpPost request = new HttpPost(url);
            StringEntity params = new StringEntity(body);
            request.addHeader("content-type", "application/json");
            request.setEntity(params);
            HttpResponse result = httpClient.execute(request);

            String json = EntityUtils.toString(result.getEntity(), "UTF-8");
            try {
                JSONParser parser = new JSONParser();
                Object resultObject = parser.parse(json);

                if (resultObject instanceof JSONArray) {
                    JSONArray array=(JSONArray)resultObject;
                    for (Object object : array) {
                        JSONObject obj =(JSONObject)object;
                        System.out.println(obj.get("example"));
                        System.out.println(obj.get("fr"));
                    }

                }else if (resultObject instanceof JSONObject) {
                    JSONObject obj =(JSONObject)resultObject;
                    System.out.println(obj.get("example"));
                    System.out.println(obj.get("fr"));
                }

            } catch (Exception e) {
                // TODO: handle exception
            }

        } catch (IOException ex) {
        }
        return null;
    }
}

etc...

return query based on date

If you are using Mongoose,

try {
  const data = await GPSDatas.aggregate([
    {
      $match: { createdAt : { $gt: new Date() }
    },
    {
      $sort: { createdAt: 1 }
    }
  ])
  console.log(data)

} catch(error) {
    console.log(error)
}

How to iterate using ngFor loop Map containing key as string and values as map iteration

Edit

For angular 6.1 and newer, use the KeyValuePipe as suggested by Londeren.

For angular 6.0 and older

To make things easier, you can create a pipe.

import {Pipe, PipeTransform} from '@angular/core';

@Pipe({name: 'getValues'})
export class GetValuesPipe implements PipeTransform {
    transform(map: Map<any, any>): any[] {
        let ret = [];

        map.forEach((val, key) => {
            ret.push({
                key: key,
                val: val
            });
        });

        return ret;
    }
}

 <li *ngFor="let recipient of map |getValues">

As it it pure, it will not be triggered on every change detection, but only if the reference to the map variable changes

Stackblitz demo

Submit form on pressing Enter with AngularJS

Will be slightly neater using a CSS class instead of repeating inline styles.

CSS

input[type=submit] {
    position: absolute;
    left: -9999px;
}

HTML

<form ng-submit="myFunc()">
    <input type="text" ng-model="name" />
    <br />
    <input type="text" ng-model="email" />
    <input type="submit" />
</form>

Zipping a file in bash fails

Run dos2unix or similar utility on it to remove the carriage returns (^M).

This message indicates that your file has dos-style lineendings:

-bash: /backup/backup.sh: /bin/bash^M: bad interpreter: No such file or directory

Utilities like dos2unix will fix it:

 dos2unix <backup.bash >improved-backup.sh

Or, if no such utility is installed, you can accomplish the same thing with translate:

tr -d "\015\032" <backup.bash >improved-backup.sh

As for how those characters got there in the first place, @MadPhysicist had some good comments.

How do I tell if an object is a Promise?

Here is the code form https://github.com/ssnau/xkit/blob/master/util/is-promise.js

!!obj && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';

if an object with a then method, it should be treat as a Promise.

What are carriage return, linefeed, and form feed?

Have a look at Wikipedia:

Systems based on ASCII or a compatible character set use either LF (Line feed, '\n', 0x0A, 10 in decimal) or CR (Carriage return, '\r', 0x0D, 13 in decimal) individually, or CR followed by LF (CR+LF, 0x0D 0x0A). These characters are based on printer commands: The line feed indicated that one line of paper should feed out of the printer, and a carriage return indicated that the printer carriage should return to the beginning of the current line.

JSR 303 Validation, If one field equals "something", then these other fields should not be null

Why does SSL handshake give 'Could not generate DH keypair' exception?

I encountered the SSL error on a CentOS server running JDK 6.

My plan was to install a higher JDK version (JDK 7) to co-exist with JDK 6 but it turns out that merely installing the newer JDK with rpm -i was not enough.

The JDK 7 installation would only succeed with the rpm -U upgrade option as illustrated below.

1. Download JDK 7

wget -O /root/jdk-7u79-linux-x64.rpm --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; o raclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm"

2. RPM installation fails

rpm -ivh jdk-7u79-linux-x64.rpm
Preparing...                ########################################### [100%]
        file /etc/init.d/jexec from install of jdk-2000:1.7.0_79-fcs.x86_64 conflicts with file from package jdk-2000:1.6.0_43-fcs.x86_64

3. RPM upgrade succeeds

rpm -Uvh jdk-7u79-linux-x64.rpm
Preparing...                ########################################### [100%]
   1:jdk                    ########################################### [100%]
Unpacking JAR files...
        rt.jar...
        jsse.jar...
        charsets.jar...
        tools.jar...
        localedata.jar...
        jfxrt.jar...

4. Confirm the new version

java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

How to concatenate multiple lines of output to one line?

Piping output to xargs will concatenate each line of output to a single line with spaces:

grep pattern file | xargs

Or any command, eg. ls | xargs. The default limit of xargs output is ~4096 characters, but can be increased with eg. xargs -s 8192.

grep xargs

C - casting int to char and append char to char

Casting int to char is done simply by assigning with the type in parenthesis:

int i = 65535;
char c = (char)i;

Note: I thought that you might be losing data (as in the example), because the type sizes are different.

Appending characters to characters cannot be done (unless you mean arithmetics, then it's simple operators). You need to use strings, AKA arrays of characters, and <string.h> functions like strcat or sprintf.

python tuple to dict

A slightly simpler method:

>>> t = ((1, 'a'),(2, 'b'))
>>> dict(map(reversed, t))
{'a': 1, 'b': 2}

What does "Could not find or load main class" mean?

According to the error message ("Could not find or load main class"), there are two categories of problems:

Main class could not be found
Main class could not be loaded (this case is not fully discussed in the accepted answer)

Main class could not be found when there is typo or wrong syntax in the fully qualified class name or it does not exist in the provided classpath.

Main class could not be loaded when the class cannot be initiated, typically the main class extends another class and that class does not exist in the provided classpath.

For example:

public class YourMain extends org.apache.camel.spring.Main

If camel-spring is not included, this error will be reported.

What's the key difference between HTML 4 and HTML 5?

Now W3c provides an official difference on their site:

http://www.w3.org/TR/html5-diff/

Re-sign IPA (iPhone)

The answers to this question are a little out of date and missing potentially key steps, so this is an updated guide for installing an app from an external developer.

----- How to Resign an iOS App -----

Let's say you receive an app (e.g. MyApp.ipa) from another developer, and you want to be able to install and run it on your devices (by using ideviceinstaller, for example).

Prepare New Signing Assets

The first step is to attain a Provisioning Profile which includes all of the devices you wish to install and run on. Ensure that the profile contains a certificate that you have installed in your Keychain Access (e.g. iPhone Developer: Some Body (XXXXXXXXXX) ). Download the profile (MyProfile.mobileprovision) so you can replace the profile embedded in the app.

Next, we are going to prepare an entitlements file to include in the signing. Open up your terminal and run the following.

$ security cms -D -i path/to/MyProfile.mobileprovision > provision.plist

This will create an xml file describing your Provisioning Profile. Next, we want to extract the entitlements into a file.

$ /usr/libexec/PlistBuddy -x -c 'Print :Entitlements' provision.plist > entitlements.plist

Replace The Provisioning Profile and Resign App

If you are working with a .ipa file, first, unzip the app (if you have a .app instead, you can skip this step).

$ unzip MyApp.ipa

Your working directory will now contain Payload/ and Payload/MyApp.app/. Next, remove the old code signature files.

$ rm -rf Payload/MyApp.app/_CodeSignature

Replace the existing provisioning profile (i.e. embedded.mobileprovision) with your own.

$ cp path/to/MyProfile.mobileprovision Payload/MyApp.app/embedded.mobileprovision

Now sign the app with the certificate included in your provisioning profile and the entitlements.plist that you created earlier.

$ /usr/bin/codesign -f -s "iPhone Developer: Some Body (XXXXXXXXXX)" --entitlements entitlements.plist Payload/MyApp.app

IMPORTANT: You must also resign all frameworks included in the app. You will find these in Payload/MyApp.app/Frameworks. If the app is written in Swift or if it includes any additional frameworks these must be resigned or the app will install but not run.

$ /usr/bin/codesign -f -s "iPhone Developer: Some Body (XXXXXXXXXX)" --entitlements entitlements.plist Payload/MyApp.app/Frameworks/*

You can now rezip the app.

$ zip -qr MyApp-resigned.ipa Payload

Done

You may now remove the Payload directory since you have your original app (MyApp.ipa) and your resigned version (MyApp-resigned.ipa). You can now install MyApp-resigned.ipa on any device included in your provisioning profile.

wget: unable to resolve host address `http'

I have this issue too. I suspect there is an issue with DigitalOcean’s nameservers, so this will likely affect a lot of other people too. Here’s what I’ve done to temporarily get around it - but someone else might be able to advise on a better long-term fix:

Make sure your DNS Resolver config file is writable:

sudo chmod o+r /etc/resolv.conf
Temporarily change your DNS to use Google’s nameservers instead of DigitalOcean’s:

sudo nano /etc/resolv.conf

Change the IP address in the file to: 8.8.8.8

Press CTRL + X to save the file.

This is only a temporary fix as this file is automatically written/updated by the server, however, I’ve not yet worked out what writes to it so that I can update it permanently.

How to empty the message in a text area with jquery?

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

Explanation (from @BalusC):
textarea is an input element with a value. You actually want to "empty" the value. So as for every other input element (input, select, textarea) you need to use element.val('');.

Also see docs

Convert varchar2 to Date ('MM/DD/YYYY') in PL/SQL

Example query: SELECT TO_CHAR(TO_DATE('2017-08-23','YYYY-MM-DD'), 'MM/DD/YYYY') FROM dual;

Making PHP var_dump() values display one line per value

I didn't wanna stop using var_dump($variable);die(); and using pre tags and loops seems overkill to me, so since I am looking at the dump in a browser, I just right click the page and choose Inspect (I use Chrome). The Elements section of the Developer Tools show the variable in a very readable format.

What are callee and caller saved registers?

The caller-saved / callee-saved terminology is based on a pretty braindead inefficient model of programming where callers actually do save/restore all the call-clobbered registers (instead of keeping long-term-useful values elsewhere), and callees actually do save/restore all the call-preserved registers (instead of just not using some or any of them).

Or you have to understand that "caller-saved" means "saved somehow if you want the value later".

In reality, efficient code lets values get destroyed when they're no longer needed. Compilers typically make functions that save a few call-preserved registers at the start of a function (and restore them at the end). Inside the function, they use those regs for values that need to survive across function calls.

I prefer "call-preserved" vs. "call-clobbered", which are unambiguous and self-describing once you've heard of the basic concept, and don't require any serious mental gymnastics to think about from the caller's perspective or the callee's perspective. (Both terms are from the same perspective).

Plus, these terms differ by more than one letter.

The terms volatile / non-volatile are pretty good, by analogy with storage which loses its value on power-loss or not, (like DRAM vs. Flash). But the C volatile keyword has a totally different technical meaning, so that's a downside to "(non)-volatile" when describing C calling conventions.

Call-clobbered, aka caller-saved or volatile registers are good for scratch / temporary values that aren't needed after the next function call.

From the callee's perspective, your function can freely overwrite (aka clobber) these registers without saving/restoring.

From a caller's perspective, call foo destroys (aka clobbers) all the call-clobbered registers, or at least you have to assume it does.

You can write private helper functions that have a custom calling convention, e.g. you know they don't modify a certain register. But if all you know (or want to assume or depend on) is that the target function follows the normal calling convention, then you have to treat a function call as if it does destroy all the call-clobbered registers. That's literally what the name come from: a call clobbers those registers.

Some compilers that do inter-procedural optimization can also create internal-use-only definitions of functions that don't follow the ABI, using a custom calling convention.

Call-preserved, aka callee-saved or non-volatile registers keep their values across function calls. This is useful for loop variables in a loop that makes function calls, or basically anything in a non-leaf function in general.

From a callee's perspective, these registers can't be modified unless you save the original value somewhere so you can restore it before returning. Or for registers like the stack pointer (which is almost always call-preserved), you can subtract a known offset and add it back again before returning, instead of actually saving the old value anywhere. i.e. you can restore it by dead reckoning, unless you allocate a runtime-variable amount of stack space. Then typically you restore the stack pointer from another register.

A function that can benefit from using a lot of registers can save/restore some call-preserved registers just so it can use them as more temporaries, even if it doesn't make any function calls. Normally you'd only do this after running out of call-clobbered registers to use, because save/restore typically costs a push/pop at the start/end of the function. (Or if your function has multiple exit paths, a pop in each of them.)

The name "caller-saved" is misleading: you don't have to specially save/restore them. Normally you arrange your code to have values that need to survive a function call in call-preserved registers, or somewhere on the stack, or somewhere else that you can reload from. It's normal to let a call destroy temporary values.

An ABI or calling convention defines which are which

See for example What registers are preserved through a linux x86-64 function call for the x86-64 System V ABI.

Also, arg-passing registers are always call-clobbered in all function-calling conventions I'm aware of. See Are rdi and rsi caller saved or callee saved registers?

But system-call calling conventions typically make all the registers except the return value call-preserved. (Usually including even condition-codes / flags.) See What are the calling conventions for UNIX & Linux system calls on i386 and x86-64

How to store the hostname in a variable in a .bat file?

hmm - something like this?

set host=%COMPUTERNAME%
echo %host%

EDIT: expanding on jitter's answer and using a technique in an answer to this question to set an environment variable with the result of running a command line app:

@echo off
hostname.exe > __t.tmp
set /p host=<__t.tmp
del __t.tmp
echo %host%

In either case, 'host' is created as an environment variable.

Test if a command outputs an empty string

if [ -z "$(ls -lA)" ]; then
  echo "no files found"
else
  echo "There are files"
fi

This will run the command and check whether the returned output (string) has a zero length. You might want to check the 'test' manual pages for other flags.

Use the "" around the argument that is being checked, otherwise empty results will result in a syntax error as there is no second argument (to check) given!

Note: that ls -la always returns . and .. so using that will not work, see ls manual pages. Furthermore, while this might seem convenient and easy, I suppose it will break easily. Writing a small script/application that returns 0 or 1 depending on the result is much more reliable!

FileNotFoundException while getting the InputStream object from HttpURLConnection

FileNotFound is just an unfortunate exception used to indicate that the web server returned a 404.

What are FTL files

http://filext.com/file-extension/FTL points to http://freemarker.sourceforge.net/ , does that help?

Using multiple parameters in URL in express

app.get('/fruit/:fruitName/:fruitColor', function(req, res) {
    var data = {
        "fruit": {
            "apple": req.params.fruitName,
            "color": req.params.fruitColor
        }
    }; 

    send.json(data);
});

If that doesn't work, try using console.log(req.params) to see what it is giving you.

Jenkins could not run git

I had similar problem, the solution for Windows looks the same (my Jenkins is installed on a Windows machine):

Global settings:

Go to Manage jenkins -> Configure System -> Git installations add there the git exe path (for example: C:\Program Files\Git\bin\git.exe), or you can use environment variable.

For Jenkins version 2.121.3, Go to Manage jenkins -> Global tool configuration -> Git installations -> Path to Git executable: C:\Program Files\Git\bin\git.exe

Jenkins job side:

Go to Source code Management -> select git, add your repository, choose connection to repository (http/ssh) and add credentials and it should work.

JQuery - Set Attribute value

$("#chk0") is refering to an element with the id chk0. You might try adding id's to the elements. Ids are unique even though the names are the same so that in jQuery you can access a single element by it's id.

How to get a list of MySQL views?

If you created any view in Mysql databases then you can simply see it as you see your all tables in your particular database.

write:

--mysql> SHOW TABLES;

you will see list of tables and views of your database.

SQLAlchemy create_all() does not create tables

You should put your model class before create_all() call, like this:

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+psycopg2://login:pass@localhost/flask_app'
db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(120), unique=True)

    def __init__(self, username, email):
        self.username = username
        self.email = email

    def __repr__(self):
        return '<User %r>' % self.username

db.create_all()
db.session.commit()

admin = User('admin', '[email protected]')
guest = User('guest', '[email protected]')
db.session.add(admin)
db.session.add(guest)
db.session.commit()
users = User.query.all()
print users

If your models are declared in a separate module, import them before calling create_all().

Say, the User model is in a file called models.py,

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+psycopg2://login:pass@localhost/flask_app'
db = SQLAlchemy(app)

# See important note below
from models import User

db.create_all()
db.session.commit()

admin = User('admin', '[email protected]')
guest = User('guest', '[email protected]')
db.session.add(admin)
db.session.add(guest)
db.session.commit()
users = User.query.all()
print users

Important note: It is important that you import your models after initializing the db object since, in your models.py _you also need to import the db object from this module.

Correct way to use get_or_create?

Following @Tobu answer and @mipadi comment, in a more pythonic way, if not interested in the created flag, I would use:

customer.source, _ = Source.objects.get_or_create(name="Website")

html5 - canvas element - Multiple layers

I was having this same problem too, I while multiple canvas elements with position:absolute does the job, if you want to save the output into an image, that's not going to work.

So I went ahead and did a simple layering "system" to code as if each layer had its own code, but it all gets rendered into the same element.

https://github.com/federicojacobi/layeredCanvas

I intend to add extra capabilities, but for now it will do.

You can do multiple functions and call them in order to "fake" layers.

Extract a substring using PowerShell

The Substring method provides us a way to extract a particular string from the original string based on a starting position and length. If only one argument is provided, it is taken to be the starting position, and the remainder of the string is outputted.

PS > "test_string".Substring(0,4)
Test
PS > "test_string".Substring(4)
_stringPS >

link text

But this is easier...

 $s = 'Hello World is in here Hello World!'
 $p = 'Hello World'
 $s -match $p

And finally, to recurse through a directory selecting only the .txt files and searching for occurrence of "Hello World":

dir -rec -filter *.txt | Select-String 'Hello World'

How to get exact browser name and version?

Got an awesome function here.

<?php
function getBrowser() { 
  $u_agent = $_SERVER['HTTP_USER_AGENT'];
  $bname = 'Unknown';
  $platform = 'Unknown';
  $version= "";

  //First get the platform?
  if (preg_match('/linux/i', $u_agent)) {
    $platform = 'linux';
  }elseif (preg_match('/macintosh|mac os x/i', $u_agent)) {
    $platform = 'mac';
  }elseif (preg_match('/windows|win32/i', $u_agent)) {
    $platform = 'windows';
  }

  // Next get the name of the useragent yes seperately and for good reason
  if(preg_match('/MSIE/i',$u_agent) && !preg_match('/Opera/i',$u_agent)){
    $bname = 'Internet Explorer';
    $ub = "MSIE";
  }elseif(preg_match('/Firefox/i',$u_agent)){
    $bname = 'Mozilla Firefox';
    $ub = "Firefox";
  }elseif(preg_match('/OPR/i',$u_agent)){
    $bname = 'Opera';
    $ub = "Opera";
  }elseif(preg_match('/Chrome/i',$u_agent) && !preg_match('/Edge/i',$u_agent)){
    $bname = 'Google Chrome';
    $ub = "Chrome";
  }elseif(preg_match('/Safari/i',$u_agent) && !preg_match('/Edge/i',$u_agent)){
    $bname = 'Apple Safari';
    $ub = "Safari";
  }elseif(preg_match('/Netscape/i',$u_agent)){
    $bname = 'Netscape';
    $ub = "Netscape";
  }elseif(preg_match('/Edge/i',$u_agent)){
    $bname = 'Edge';
    $ub = "Edge";
  }elseif(preg_match('/Trident/i',$u_agent)){
    $bname = 'Internet Explorer';
    $ub = "MSIE";
  }

  // finally get the correct version number
  $known = array('Version', $ub, 'other');
  $pattern = '#(?<browser>' . join('|', $known) .
')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';
  if (!preg_match_all($pattern, $u_agent, $matches)) {
    // we have no matching number just continue
  }
  // see how many we have
  $i = count($matches['browser']);
  if ($i != 1) {
    //we will have two since we are not using 'other' argument yet
    //see if version is before or after the name
    if (strripos($u_agent,"Version") < strripos($u_agent,$ub)){
        $version= $matches['version'][0];
    }else {
        $version= $matches['version'][1];
    }
  }else {
    $version= $matches['version'][0];
  }

  // check if we have a number
  if ($version==null || $version=="") {$version="?";}

  return array(
    'userAgent' => $u_agent,
    'name'      => $bname,
    'version'   => $version,
    'platform'  => $platform,
    'pattern'    => $pattern
  );
} 

// now try it
$ua=getBrowser();
$yourbrowser= "Your browser: " . $ua['name'] . " " . $ua['version'] . " on " .$ua['platform'] . " reports: <br >" . $ua['userAgent'];
print_r($yourbrowser);
?>

mongodb service is not starting up

Remember that when you restart the database by removing .lock files by force, the data might get corrupted. Your server shouldn't be considered "healthy" if you restarted the server that way.

To amend the situation, either run

mongod --repair

> db.repairDatabase();

in the mongo shell to bring your database back to "healthy" state.

Change Timezone in Lumen or Laravel 5

Just changing APP_TIMEZONE=Asia/Colombo in .env and run php artisan lumen-config:cache worked for me in lumen 5.7

What is the difference between --save and --save-dev?

You generally don't want to bloat production package with things that you only intend to use for Development purposes.

Use --save-dev (or -D) option to separate packages such as Unit Test frameworks (jest, jasmine, mocha, chai, etc.)

Any other packages that your app needs for Production, should be installed using --save (or -S).

npm install --save lodash       //prod dependency
npm install -S moment           // "       "
npm install -S opentracing      // "       "

npm install -D jest                 //dev only dependency
npm install --save-dev typescript   //dev only dependency

If you open the package.json file then you will see these entries listed under two different sections:

"dependencies": {
  "lodash": "4.x",
  "moment": "2.x",
  "opentracing": "^0.14.1"
},

"devDependencies": {
    "jest": "22.x",
    "typescript": "^2.8.3"
},

Doctrine 2: Update query with query builder

Let's say there is an administrator dashboard where users are listed with their id printed as a data attribute so it can be retrieved at some point via JavaScript.

An update could be executed this way …

class UserRepository extends \Doctrine\ORM\EntityRepository
{
    public function updateUserStatus($userId, $newStatus)
    {
        return $this->createQueryBuilder('u')
            ->update()
            ->set('u.isActive', '?1')
            ->setParameter(1, $qb->expr()->literal($newStatus))
            ->where('u.id = ?2')
            ->setParameter(2, $qb->expr()->literal($userId))
            ->getQuery()
            ->getSingleScalarResult()
        ;
    }

AJAX action handling:

# Post datas may be:
# handled with a specific custom formType — OR — retrieved from request object
$userId = (int)$request->request->get('userId');
$newStatus = (int)$request->request->get('newStatus');
$em = $this->getDoctrine()->getManager();
$r = $em->getRepository('NAMESPACE\User')
        ->updateUserStatus($userId, $newStatus);
if ( !empty($r) ){
    # Row updated
}

Working example using Doctrine 2.5 (on top of Symfony3).

align an image and some text on the same line without using div width?

To get the desired effect, you should place the image tag inside the same div as your text. Then set the float: left attribute on the image. Hope this helps!

How do I use raw_input in Python 3

Starting with Python 3, raw_input() was renamed to input().

From What’s New In Python 3.0, Builtins section second item.

JavaScript math, round to two decimal places

NOTE - See Edit 4 if 3 digit precision is important

var discount = (price / listprice).toFixed(2);

toFixed will round up or down for you depending on the values beyond 2 decimals.

Example: http://jsfiddle.net/calder12/tv9HY/

Documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed

Edit - As mentioned by others this converts the result to a string. To avoid this:

var discount = +((price / listprice).toFixed(2));

Edit 2- As also mentioned in the comments this function fails in some precision, in the case of 1.005 for example it will return 1.00 instead of 1.01. If accuracy to this degree is important I've found this answer: https://stackoverflow.com/a/32605063/1726511 Which seems to work well with all the tests I've tried.

There is one minor modification required though, the function in the answer linked above returns whole numbers when it rounds to one, so for example 99.004 will return 99 instead of 99.00 which isn't ideal for displaying prices.

Edit 3 - Seems having the toFixed on the actual return was STILL screwing up some numbers, this final edit appears to work. Geez so many reworks!

var discount = roundTo((price / listprice), 2);

function roundTo(n, digits) {
  if (digits === undefined) {
    digits = 0;
  }

  var multiplicator = Math.pow(10, digits);
  n = parseFloat((n * multiplicator).toFixed(11));
  var test =(Math.round(n) / multiplicator);
  return +(test.toFixed(digits));
}

See Fiddle example here: https://jsfiddle.net/calder12/3Lbhfy5s/

Edit 4 - You guys are killing me. Edit 3 fails on negative numbers, without digging into why it's just easier to deal with turning a negative number positive before doing the rounding, then turning it back before returning the result.

function roundTo(n, digits) {
    var negative = false;
    if (digits === undefined) {
        digits = 0;
    }
    if (n < 0) {
        negative = true;
        n = n * -1;
    }
    var multiplicator = Math.pow(10, digits);
    n = parseFloat((n * multiplicator).toFixed(11));
    n = (Math.round(n) / multiplicator).toFixed(digits);
    if (negative) {
        n = (n * -1).toFixed(digits);
    }
    return n;
}

Fiddle: https://jsfiddle.net/3Lbhfy5s/79/

Change background color of iframe issue

You can do it using javascript

Change iframe background color
Change background color of the loaded page (same domain)

Plain javascript

var iframe = document.getElementsByTagName('iframe')[0];
iframe.style.background = 'white';
iframe.contentWindow.document.body.style.backgroundColor = 'white';

jQuery

$('iframe').css('background', 'white');
$('iframe').contents().find('body').css('backgroundColor', 'white');

How to change default format at created_at and updated_at value laravel

Laravel 4.x and 5.0

To change the time in the database use: http://laravel.com/docs/4.2/eloquent#timestamps

Providing A Custom Timestamp Format

If you wish to customize the format of your timestamps, you may override the getDateFormat method in your model:

class User extends Eloquent {

    protected function getDateFormat()
    {
        return 'U';
    }

}

Laravel 5.1+

https://laravel.com/docs/5.1/eloquent

If you need to customize the format of your timestamps, set the $dateFormat property on your model. This property determines how date attributes are stored in the database, as well as their format when the model is serialized to an array or JSON:

class Flight extends Model
{
    /**
     * The storage format of the model's date columns.
     *
     * @var string
     */
    protected $dateFormat = 'U';
}

C# Numeric Only TextBox Control

this way is right with me:

private void textboxNumberic_KeyPress(object sender, KeyPressEventArgs e)
{
     const char Delete = (char)8;
     e.Handled = !Char.IsDigit(e.KeyChar) && e.KeyChar != Delete;
}

Change "on" color of a Switch

Based on a combination of a few of the answers here this is what worked for me.

<Switch
    android:trackTintMode="src_over"
    android:thumbTint="@color/white"
    android:trackTint="@color/shadow"
    android:checked="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

Clear a terminal screen for real

None of the answers I read worked in PuTTY, so I found a comment on this article:

In the settings for your connection, under "Window->Behavior" you'll find a setting "System Menu Appears on ALT alone". Then CTRL + L, ALT, l (that's a lower case L) will scroll the screen and then clear the scrollback buffer.

(relevant to the OP because I am connecting to an Ubuntu server, but also apparently relevant no matter what your server is running.)

How to use the command update-alternatives --config java

There are many other binaries that need to be linked so I think it's much better to try something like sudo update-alternatives --all and choosing the right alternatives for everything else besides java and javac.

How to select specified node within Xpath node sets by index with Selenium?

There is no i in xpath is not entirely true. You can still use the count() to find the index.

Consider the following page

_x000D_

<html>_x000D_
_x000D_
 <head>_x000D_
  <title>HTML Sample table</title>_x000D_
 </head>_x000D_
_x000D_
 <style>_x000D_
 table, td, th {_x000D_
  border: 1px solid black;_x000D_
  font-size: 15px;_x000D_
  font-family: Trebuchet MS, sans-serif;_x000D_
 }_x000D_
 table {_x000D_
  border-collapse: collapse;_x000D_
  width: 100%;_x000D_
 }_x000D_
_x000D_
 th, td {_x000D_
  text-align: left;_x000D_
  padding: 8px;_x000D_
 }_x000D_
_x000D_
 tr:nth-child(even){background-color: #f2f2f2}_x000D_
_x000D_
 th {_x000D_
  background-color: #4CAF50;_x000D_
  color: white;_x000D_
 }_x000D_
 </style>_x000D_
_x000D_
 <body>_x000D_
 <table>_x000D_
  <thead>_x000D_
   <tr>_x000D_
    <th>Heading 1</th>_x000D_
    <th>Heading 2</th>_x000D_
    <th>Heading 3</th>_x000D_
    <th>Heading 4</th>_x000D_
    <th>Heading 5</th>_x000D_
    <th>Heading 6</th>_x000D_
   </tr>_x000D_
  </thead>_x000D_
  <tbody>_x000D_
   <tr>_x000D_
    <td>Data row 1 col 1</td>_x000D_
    <td>Data row 1 col 2</td>_x000D_
    <td>Data row 1 col 3</td>_x000D_
    <td>Data row 1 col 4</td>_x000D_
    <td>Data row 1 col 5</td>_x000D_
    <td>Data row 1 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 2 col 1</td>_x000D_
    <td>Data row 2 col 2</td>_x000D_
    <td>Data row 2 col 3</td>_x000D_
    <td>Data row 2 col 4</td>_x000D_
    <td>Data row 2 col 5</td>_x000D_
    <td>Data row 2 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 3 col 1</td>_x000D_
    <td>Data row 3 col 2</td>_x000D_
    <td>Data row 3 col 3</td>_x000D_
    <td>Data row 3 col 4</td>_x000D_
    <td>Data row 3 col 5</td>_x000D_
    <td>Data row 3 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 4 col 1</td>_x000D_
    <td>Data row 4 col 2</td>_x000D_
    <td>Data row 4 col 3</td>_x000D_
    <td>Data row 4 col 4</td>_x000D_
    <td>Data row 4 col 5</td>_x000D_
    <td>Data row 4 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 5 col 1</td>_x000D_
    <td>Data row 5 col 2</td>_x000D_
    <td>Data row 5 col 3</td>_x000D_
    <td>Data row 5 col 4</td>_x000D_
    <td>Data row 5 col 5</td>_x000D_
    <td>Data row 5 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
   </tr>_x000D_
  </tbody>_x000D_
 </table>_x000D_
_x000D_
 </br>_x000D_
_x000D_
 <table>_x000D_
  <thead>_x000D_
   <tr>_x000D_
    <th>Heading 7</th>_x000D_
    <th>Heading 8</th>_x000D_
    <th>Heading 9</th>_x000D_
    <th>Heading 10</th>_x000D_
    <th>Heading 11</th>_x000D_
    <th>Heading 12</th>_x000D_
   </tr>_x000D_
  </thead>_x000D_
  <tbody>_x000D_
   <tr>_x000D_
    <td>Data row 1 col 1</td>_x000D_
    <td>Data row 1 col 2</td>_x000D_
    <td>Data row 1 col 3</td>_x000D_
    <td>Data row 1 col 4</td>_x000D_
    <td>Data row 1 col 5</td>_x000D_
    <td>Data row 1 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 2 col 1</td>_x000D_
    <td>Data row 2 col 2</td>_x000D_
    <td>Data row 2 col 3</td>_x000D_
    <td>Data row 2 col 4</td>_x000D_
    <td>Data row 2 col 5</td>_x000D_
    <td>Data row 2 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 3 col 1</td>_x000D_
    <td>Data row 3 col 2</td>_x000D_
    <td>Data row 3 col 3</td>_x000D_
    <td>Data row 3 col 4</td>_x000D_
    <td>Data row 3 col 5</td>_x000D_
    <td>Data row 3 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 4 col 1</td>_x000D_
    <td>Data row 4 col 2</td>_x000D_
    <td>Data row 4 col 3</td>_x000D_
    <td>Data row 4 col 4</td>_x000D_
    <td>Data row 4 col 5</td>_x000D_
    <td>Data row 4 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td>Data row 5 col 1</td>_x000D_
    <td>Data row 5 col 2</td>_x000D_
    <td>Data row 5 col 3</td>_x000D_
    <td>Data row 5 col 4</td>_x000D_
    <td>Data row 5 col 5</td>_x000D_
    <td>Data row 5 col 6</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
    <td><button>Modify</button></td>_x000D_
   </tr>_x000D_
  </tbody>_x000D_
 </table>_x000D_
_x000D_
 </body>_x000D_
</html>

_x000D_

The page has 2 tables and has 6 columns each with unique column names and 6 rows with variable data. The last row has the Modify button in both the tables.

Assuming that the user has to select the 4th Modify button from the first table based on the heading

Use the xpath //th[.='Heading 4']/ancestor::thead/following-sibling::tbody/tr/td[count(//tr/th[.='Heading 4']/preceding-sibling::th)+1]/button

The count() operator comes in handy in situations like these.

Logic:

Find the header for the Modify button using //th[.='Heading 4']
Find the index of the header column using count(//tr/th[.='Heading 4']/preceding-sibling::th)+1

Note: Index starts at 0

Get the rows for the corresponding header using //th[.='Heading 4']/ancestor::thead/following-sibling::tbody/tr/td[count(//tr/th[.='Heading 4']/preceding-sibling::th)+1]
Get the Modify button from the extracted node list using //th[.='Heading 4']/ancestor::thead/following-sibling::tbody/tr/td[count(//tr/th[.='Heading 4']/preceding-sibling::th)+1]/button

How can I convert String to Int?

You can write your own extension method

public static class IntegerExtensions
{
    public static int ParseInt(this string value, int defaultValue = 0)
    {
        int parsedValue;
        if (int.TryParse(value, out parsedValue))
        {
            return parsedValue;
        }

        return defaultValue;
    }

    public static int? ParseNullableInt(this string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            return null;
        }

        return value.ParseInt();
    }
}

And wherever in code just call

int myNumber = someString.ParseInt(); // Returns value or 0
int age = someString.ParseInt(18); // With default value 18
int? userId = someString.ParseNullableInt(); // Returns value or null

In this concrete case

int yourValue = TextBoxD1.Text.ParseInt();

How to set host_key_checking=false in ansible inventory file?

You set these configs either in the /etc/ansible/ansible.cfg or ~/.ansible.cfg or ansible.cfg(in your current directory) file

[ssh_connection]
ssh_args = -C -o ControlMaster=auto -o ControlPersist=60s -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no

tested with ansible 2.9.6 in ubuntu 20.04

Counting the number of elements with the values of x in a vector

There are different ways of counting a specific elements

library(plyr)
numbers =c(4,23,4,23,5,43,54,56,657,67,67,435,453,435,7,65,34,435)

print(length(which(numbers==435)))

#Sum counts number of TRUE's in a vector 
print(sum(numbers==435))
print(sum(c(TRUE, FALSE, TRUE)))

#count is present in plyr library 
#o/p of count is a DataFrame, freq is 1 of the columns of data frame
print(count(numbers[numbers==435]))
print(count(numbers[numbers==435])[['freq']])

Manifest Merger failed with multiple errors in Android Studio

I was also facing same issues, and after lot of research found the solution:

Your min sdk version should be same as of the modules you are using eg: your module min sdk version is 14 and your app min sdk version is 9 It should be same.

If build version of your app and modules not same. Again it should same ** In short, your app build.gradle file and manifest should have same configurations**

There's no duplicacy like same permissions added in manifest file twice, same activity mention twice.

If you have delete any activity from your project, delete it from your manifest file as well.

Sometimes its because of label, icon etc tag of manifest file:

a) Add the xmlns:tools line in the manifest tag.

b) Add tools:replace= or tools:ignore= in the application tag.

Example:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.slinfy.ikharelimiteduk"
    xmlns:tools="http://schemas.android.com/tools"
    android:versionCode="1"
    android:versionName="1.0" >

  <application
      tools:replace="icon, label"
      android:label="myApp"
      android:name="com.example.MyApplication"
      android:allowBackup="true"
      android:hardwareAccelerated="false"
      android:icon="@drawable/ic_launcher"
      android:theme="@style/Theme.AppCompat" >
  </application>

</manifest>

If two dependencies are of not same version example: you are using dependency for appcompat v7:26.0.0 and for facebook com.facebook.android:facebook-android-sdk:[4,5) facebook uses cardview of version com.android.support:cardview-v7:25.3.1 and appcompat v7:26.0.0 uses cardview of version v7:26.0.0, So there is discripancy in two libraries and thus give error

Error:Execution failed for task ':app:processDebugManifest'.

Manifest merger failed : Attribute meta-data#android.support.VERSION@value value=(26.0.0-alpha1) from [com.android.support:appcompat-v7:26.0.0-alpha1] AndroidManifest.xml:27:9-38 is also present at [com.android.support:cardview-v7:25.3.1] AndroidManifest.xml:24:9-31 value=(25.3.1). Suggestion: add 'tools:replace="android:value"' to element at AndroidManifest.xml:25:5-27:41 to override.

So by using appcompat of version 25.3.1, We can avoid this error

By considering above points in mind, you will get rid of this irritating issue. You can check my blog too https://wordpress.com/post/dhingrakimmi.wordpress.com/23

Reading Datetime value From Excel sheet

Alternatively, if your cell is already a real date, just use .Value instead of .Value2:

excelApp.Range[namedRange].Value
{21/02/2013 00:00:00}
    Date: {21/02/2013 00:00:00}
    Day: 21
    DayOfWeek: Thursday
    DayOfYear: 52
    Hour: 0
    Kind: Unspecified
    Millisecond: 0
    Minute: 0
    Month: 2
    Second: 0
    Ticks: 634970016000000000
    TimeOfDay: {00:00:00}
    Year: 2013

excelApp.Range[namedRange].Value2
41326.0

Laravel 5 show ErrorException file_put_contents failed to open stream: No such file or directory

I had similar problems because of .gitignore for the /storage folder on first machine, then cloned repository on second machine and laravel was revision to write down sessions cache

So, manually creating folder /storage/sessions might be an solution..

Python conversion from binary string to hexadecimal

Using no messy concatenations and padding :

'{:0{width}x}'.format(int(temp,2)), width=4)

Will give a hex representation with padding preserved

ApiNotActivatedMapError for simple html page using google-places-api

Have you tried following the advice on the linked help page? The help page at http://g.co/mapsJSApiErrors says:

ApiNotActivatedMapError

The Google Maps JavaScript API is not activated on your API project. You may need to enable the Google Maps JavaScript API under APIs in the Google Developers Console.

See Obtaining an API key.

So check that the key you are using has Google Maps JavaScript API enabled.

How to overcome "datetime.datetime not JSON serializable"?

Actually it is quite simple. If you need to often serialize dates, then work with them as strings. You can easily convert them back as datetime objects if needed.

If you need to work mostly as datetime objects, then convert them as strings before serializing.

import json, datetime

date = str(datetime.datetime.now())
print(json.dumps(date))
"2018-12-01 15:44:34.409085"
print(type(date))
<class 'str'>

datetime_obj = datetime.datetime.strptime(date, '%Y-%m-%d %H:%M:%S.%f')
print(datetime_obj)
2018-12-01 15:44:34.409085
print(type(datetime_obj))
<class 'datetime.datetime'>

As you can see, the output is the same in both cases. Only the type is different.

Setting a property with an EventTrigger

Stopping the Storyboard can be done in the code behind, or the xaml, depending on where the need comes from.

If the EventTrigger is moved outside of the button, then we can go ahead and target it with another EventTrigger that will tell the storyboard to stop. When the storyboard is stopped in this manner it will not revert to the previous value.

Here I've moved the Button.Click EventTrigger to a surrounding StackPanel and added a new EventTrigger on the the CheckBox.Click to stop the Button's storyboard when the CheckBox is clicked. This lets us check and uncheck the CheckBox when it is clicked on and gives us the desired unchecking behavior from the button as well.

    <StackPanel x:Name="myStackPanel">

        <CheckBox x:Name="myCheckBox"
                  Content="My CheckBox" />

        <Button Content="Click to Uncheck"
                x:Name="myUncheckButton" />

        <Button Content="Click to check the box in code."
                Click="OnClick" />

        <StackPanel.Triggers>

            <EventTrigger RoutedEvent="Button.Click"
                          SourceName="myUncheckButton">
                <EventTrigger.Actions>
                    <BeginStoryboard x:Name="myBeginStoryboard">
                        <Storyboard x:Name="myStoryboard">
                            <BooleanAnimationUsingKeyFrames Storyboard.TargetName="myCheckBox"
                                                            Storyboard.TargetProperty="IsChecked">
                                <DiscreteBooleanKeyFrame KeyTime="00:00:00"
                                                         Value="False" />
                            </BooleanAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger.Actions>
            </EventTrigger>

            <EventTrigger RoutedEvent="CheckBox.Click"
                          SourceName="myCheckBox">
                <EventTrigger.Actions>
                    <StopStoryboard BeginStoryboardName="myBeginStoryboard" />
                </EventTrigger.Actions>
            </EventTrigger>

        </StackPanel.Triggers>
    </StackPanel>

To stop the storyboard in the code behind, we will have to do something slightly different. The third button provides the method where we will stop the storyboard and set the IsChecked property back to true through code.

We can't call myStoryboard.Stop() because we did not begin the Storyboard through the code setting the isControllable parameter. Instead, we can remove the Storyboard. To do this we need the FrameworkElement that the storyboard exists on, in this case our StackPanel. Once the storyboard is removed, we can once again set the IsChecked property with it persisting to the UI.

    private void OnClick(object sender, RoutedEventArgs e)
    {
        myStoryboard.Remove(myStackPanel);
        myCheckBox.IsChecked = true;
    }

Git keeps asking me for my ssh key passphrase

This has been happening to me after restarts since upgrading from OS X El Capitan (10.11) to macOS Sierra (10.12). The ssh-add solution worked temporarily but would not persist across another restart.

The permanent solution was to edit (or create) ~/.ssh/config and enable the UseKeychain option.

Host *
    UseKeychain yes

How to make a JTable non-editable

just add

table.setEnabled(false);

it works fine for me.

Representing Directory & File Structure in Markdown Syntax

I followed an example in another repository and wrapped the directory structure within a pair of triple backticks (```):

```
project
¦   README.md
¦   file001.txt    
¦
+---folder1
¦   ¦   file011.txt
¦   ¦   file012.txt
¦   ¦
¦   +---subfolder1
¦       ¦   file111.txt
¦       ¦   file112.txt
¦       ¦   ...
¦   
+---folder2
    ¦   file021.txt
    ¦   file022.txt
```

Multiline editing in Visual Studio Code

version 1.43 (February 2020)

You can now toggle column selection mode, which changes mouse gestures and arrow keys, via:

Menu Bar > Selection > Column Selection Mode
Ctrl+Shift+P (Show All Commands) > Toggle Column Selection Mode
Bind your key for command "editor.action.toggleColumnSelection"

Note: There is a "Column Selection" panel in the status bar after activation, which you can press to disable it again.

How do you remove an invalid remote branch reference from Git?

I didn't know about git branch -rd, so the way I have solved issues like this for myself is to treat my repo as a remote repo and do a remote delete. git push . :refs/remotes/public/master. If the other ways don't work and you have some weird reference you want to get rid of, this raw way is surefire. It gives you the exact precision to remove (or create!) any kind of reference.

Suppress InsecureRequestWarning: Unverified HTTPS request is being made in Python2.6

Suppress logs using standard python library 'logging'

Place this code on the top of your existing code

import logging
urllib3_logger = logging.getLogger('urllib3')
urllib3_logger.setLevel(logging.CRITICAL)

How to add footnotes to GitHub-flavoured Markdown?

Expanding a little bit on the previous answer, you can make the footnote links clickable here as well. First define the footnote at the bottom like this

<a name="myfootnote1">1</a>: Footnote content goes here

Then reference it at some other place in the document like this

<sup>[1](#myfootnote1)</sup>

Calculate summary statistics of columns in dataframe

Now there is the pandas_profiling package, which is a more complete alternative to df.describe().

If your pandas dataframe is df, the below will return a complete analysis including some warnings about missing values, skewness, etc. It presents histograms and correlation plots as well.

import pandas_profiling
pandas_profiling.ProfileReport(df)

See the example notebook detailing the usage.

How do I execute code AFTER a form has loaded?

You could use the "Shown" event: MSDN - Form.Shown

"The Shown event is only raised the first time a form is displayed; subsequently minimizing, maximizing, restoring, hiding, showing, or invalidating and repainting will not raise this event."

Check if int is between two numbers

if (10 < x || x < 20)

This statement will evaluate true for numbers between 10 and 20. This is a rough equivalent to 10 < x < 20

How to create a jQuery function (a new jQuery method or plugin)?

You can always do this:

jQuery.fn.extend({
   myfunction: function(param){
       // code here
   },
});
OR
jQuery.extend({
   myfunction: function(param){
       // code here
   },
});
$(element).myfunction(param);

MySQL: #1075 - Incorrect table definition; autoincrement vs another key?

You can make the id the primary key, and set member_id to NOT NULL UNIQUE. (Which you've done.) Columns that are NOT NULL UNIQUE can be the target of foreign key references, just like a primary key can. (I'm pretty sure that's true of all SQL platforms.)

At the conceptual level, there's no difference between PRIMARY KEY and NOT NULL UNIQUE. At the physical level, this is a MySQL issue; other SQL platforms will let you use a sequence without making it the primary key.

But if performance is really important, you should think twice about widening your table by four bytes per row for that tiny visual convenience. In addition, if you switch to INNODB in order to enforce foreign key constraints, MySQL will use your primary key in a clustered index. Since you're not using your primary key, I imagine that could hurt performance.

How do I access command line arguments in Python?

If you call it like this: $ python myfile.py var1 var2 var3

import sys

var1 = sys.argv[1]
var2 = sys.argv[2]
var3 = sys.argv[3]

Similar to arrays you also have sys.argv[0] which is always the current working directory.

Multiple "style" attributes in a "span" tag: what's supposed to happen?

Separate your rules with a semi colon in a single declaration:

<span style="color:blue;font-style:italic">Test</span>

Conversion failed when converting date and/or time from character string while inserting datetime

set Culture to english from web.config file

  <globalization uiCulture="en-US" culture="en-US" />

for example if you set the culture to arabic the thime will be

?22?/09?/2017? 02:16:57 ?

and you get the error:Conversion failed when converting date and/or time from character string while inserting datetime

Mock HttpContext.Current in Test Init Method

If your application third party redirect internally, so it is better to mock HttpContext in below way :

HttpWorkerRequest initWorkerRequest = new SimpleWorkerRequest("","","","",new StringWriter(CultureInfo.InvariantCulture));
System.Web.HttpContext.Current = new HttpContext(initWorkerRequest);
System.Web.HttpContext.Current.Request.Browser = new HttpBrowserCapabilities();
System.Web.HttpContext.Current.Request.Browser.Capabilities = new Dictionary<string, string> { { "requiresPostRedirectionHandling", "false" } };

Oracle "Partition By" Keyword

The concept is very well explained by the accepted answer, but I find that the more example one sees, the better it sinks in. Here's an incremental example:

1) Boss says "get me number of items we have in stock grouped by brand"

You say: "no problem"

SELECT 
      BRAND
      ,COUNT(ITEM_ID) 
FROM 
      ITEMS
GROUP BY 
      BRAND;

Result:

+--------------+---------------+
|  Brand       |   Count       | 
+--------------+---------------+
| H&M          |     50        |
+--------------+---------------+
| Hugo Boss    |     100       |
+--------------+---------------+
| No brand     |     22        |
+--------------+---------------+

2) The boss says "Now get me a list of all items, with their brand AND number of items that the respective brand has"

You may try:

 SELECT 
      ITEM_NR
      ,BRAND
      ,COUNT(ITEM_ID) 
 FROM 
      ITEMS
 GROUP BY 
      BRAND;

But you get:

ORA-00979: not a GROUP BY expression

This is where the OVER (PARTITION BY BRAND) comes in:

 SELECT 
      ITEM_NR
      ,BRAND
      ,COUNT(ITEM_ID) OVER (PARTITION BY BRAND) 
 FROM 
      ITEMS;

Whic means:

COUNT(ITEM_ID) - get the number of items
OVER - Over the set of rows
(PARTITION BY BRAND) - that have the same brand

And the result is:

+--------------+---------------+----------+
|  Items       |  Brand        | Count()  |
+--------------+---------------+----------+
|  Item 1      |  Hugo Boss    |   100    | 
+--------------+---------------+----------+
|  Item 2      |  Hugo Boss    |   100    | 
+--------------+---------------+----------+
|  Item 3      |  No brand     |   22     | 
+--------------+---------------+----------+
|  Item 4      |  No brand     |   22     | 
+--------------+---------------+----------+
|  Item 5      |  H&M          |   50     | 
+--------------+---------------+----------+

etc...

No @XmlRootElement generated by JAXB

After sruggling for two days I found the solution for the problem.You can use the ObjectFactory class to workaround for the classes which doesn't have the @XmlRootElement. ObjectFactory has overloaded methods to wrap it around the JAXBElement.

Method:1 does the simple creation of the object.

Method:2 will wrap the object with @JAXBElement.

Always use Method:2 to avoid javax.xml.bind.MarshalException - with linked exception missing an @XmlRootElement annotation.

Please find the sample code below

Method:1 does the simple creation of the object

public GetCountry createGetCountry() {
        return new GetCountry();
    }

Method:2 will wrap the object with @JAXBElement.

 @XmlElementDecl(namespace = "my/name/space", name = "getCountry")
 public JAXBElement<GetCountry> createGetCountry(GetCountry value) {
        return new JAXBElement<GetCountry>(_GetCountry_QNAME, GetCountry.class, null, value);
    }

Working code sample:

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
WebServiceTemplate springWSTemplate = context.getBean(WebServiceTemplate.class);

GetCountry request = new GetCountry();
request.setGuid("test_guid");

JAXBElement<GetCountryResponse> jaxbResponse = (JAXBElement<GetCountryResponse>)springWSTemplate .marshalSendAndReceive(new ObjectFactory().createGetCountry(request));

GetCountryResponse response = jaxbResponse.getValue();

Basic Apache commands for a local Windows machine

For frequent uses of this command I found it easy to add the location of C:\xampp\apache\bin to the PATH. Use whatever directory you have this installed in.

Then you can run from any directory in command line:

httpd -k restart

The answer above that suggests httpd -k -restart is actually a typo. You can see the commands by running httpd /?

check if a std::vector contains a certain object?

If searching for an element is important, I'd recommend std::set instead of std::vector. Using this:

std::find(vec.begin(), vec.end(), x) runs in O(n) time, but std::set has its own find() member (ie. myset.find(x)) which runs in O(log n) time - that's much more efficient with large numbers of elements

std::set also guarantees all the added elements are unique, which saves you from having to do anything like if not contained then push_back()....

jquery, find next element by class

Given a first selector: SelectorA, you can find the next match of SelectorB as below:

Example with mouseover to change border-with:

$("SelectorA").on("mouseover", function() {
    var i = $(this).find("SelectorB")[0];
    $(i).css({"border" : "1px"});
    });
}

General use example to change border-with:

var i = $("SelectorA").find("SelectorB")[0];
$(i).css({"border" : "1px"});

Count how many rows have the same value

Try

SELECT NAME, count(*) as NUM FROM tbl GROUP BY NAME

SQL FIDDLE

Java current machine name and logged in user?

To get the currently logged in user path:

System.getProperty("user.home");

Change the selected value of a drop-down list with jQuery

Just a note - I've been using wildcard selectors in jQuery to grab items that are obfuscated by ASP.NET Client IDs - this might help you too:

<asp:DropDownList id="MyDropDown" runat="server" />

$("[id* = 'MyDropDown']").append("<option value='-1'>&nbsp;</option>"); //etc

Note the id* wildcard- this will find your element even if the name is "ctl00$ctl00$ContentPlaceHolder1$ContentPlaceHolder1$MyDropDown"

How to set default values in Rails?

You could use the rails_default_value gem. eg:

class Foo < ActiveRecord::Base
  # ...
  default :bar => 'some default value'
  # ...
end

https://github.com/keithrowell/rails_default_value

Lua String replace

Try:

name = "^aH^ai"
name = name:gsub("%^a", "")

Angular 2: Can't bind to 'ngModel' since it isn't a known property of 'input'

To be able to use 'ngModule', the 'FormsModule' (from @angular/forms) needs to be added to your import[] array in the AppModule (should be there by default in a CLI project).

Python print statement “Syntax Error: invalid syntax”

In Python 3, print is a function, you need to call it like print("hello world").

Textfield with only bottom border

See this JSFiddle

_x000D_

 input[type="text"]_x000D_
    {_x000D_
        border: 0;_x000D_
        border-bottom: 1px solid red;_x000D_
        outline: 0;_x000D_
    }

_x000D_

<form>_x000D_
        <input type="text" value="See! ONLY BOTTOM BORDER!" />_x000D_
    </form>

_x000D_

How can I get System variable value in Java?

To clarify, system variables are the same as environment variables. User environment variables are set per user and are different whenever a different user logs in. System wide environment variables are the same no matter what user logs on.

To access either the current value of a system wide variable or a user variable in Java, see below:

String javaHome = System.getenv("JAVA_HOME");

For more information on environment variables see this wikipedia page.

Also make sure the environment variable you are trying to read is properly set before invoking Java by doing a:

echo %MYENVVAR%

You should see the value of the environment variable. If not, you may need to reopen the shell (DOS) or log off and log back on.

Bootstrap Modal immediately disappearing

In my case, a click on a button causes a (not wanted) reload of the page.

Here is my fix:

<button class="btn btn-success" onclick="javascript: return false;" 
data-target="#modalID" data-toggle="modal">deaktivieren</button>

Standard concise way to copy a file in Java?

As toolkit mentions above, Apache Commons IO is the way to go, specifically FileUtils.copyFile(); it handles all the heavy lifting for you.

And as a postscript, note that recent versions of FileUtils (such as the 2.0.1 release) have added the use of NIO for copying files; NIO can significantly increase file-copying performance, in a large part because the NIO routines defer copying directly to the OS/filesystem rather than handle it by reading and writing bytes through the Java layer. So if you're looking for performance, it might be worth checking that you are using a recent version of FileUtils.

Getting around the Max String size in a vba function?

This works and shows more than 255 characters in the message box.

Sub TestStrLength()
    Dim s As String
    Dim i As Integer

    s = ""
    For i = 1 To 500
        s = s & "1234567890"
    Next i

    MsgBox s
End Sub

The message box truncates the string to 1023 characters, but the string itself can be very large.

I would also recommend that instead of using fixed variables names with numbers (e.g. Var1, Var2, Var3, ... Var255) that you use an array. This is much shorter declaration and easier to use - loops.

Here's an example:

Sub StrArray()
Dim var(256) As Integer
Dim i As Integer
Dim s As String

For i = 1 To 256
    var(i) = i
Next i

s = "Tims_pet_Robot"
For i = 1 To 256
    s = s & " """ & var(i) & """"
Next i

    SecondSub (s)
End Sub

Sub SecondSub(s As String)
    MsgBox "String length = " & Len(s)
End Sub

Updated this to show that a string can be longer than 255 characters and used in a subroutine/function as a parameter that way. This shows that the string length is 1443 characters. The actual limit in VBA is 2GB per string.

Perhaps there is instead a problem with the API that you are using and that has a limit to the string (such as a fixed length string). The issue is not with VBA itself.

Ok, I see the problem is specifically with the Application.OnTime method itself. It is behaving like Excel functions in that they only accept strings that are up to 255 characters in length. VBA procedures and functions though do not have this limit as I have shown. Perhaps then this limit is imposed for any built-in Excel object method.

Update:
changed ...longer than 256 characters... to ...longer than 255 characters...

Postgresql: Scripting psql execution with password

This might be an old question, but there's an alternate method you can use that no one has mentioned. It's possible to specify the password directly in the connection URI. The documentation can be found here, alternatively here.

You can provide your username and password directly in the connection URI provided to psql:

# postgresql://[user[:password]@][netloc][:port][/dbname][?param1=value1&...]
psql postgresql://username:password@localhost:5432/mydb

The way to check a HDFS directory's size?

hadoop fs -du -s -h /path/to/dir displays a directory's size in readable form.

$(window).width() not the same as media query

Javascript provides more than one method to check the viewport width. As you noticed, innerWidth doesn't include the toolbar width, and toolbar widths will differ across systems. There is also the outerWidth option, which will include the toolbar width. The Mozilla Javascript API states:

Window.outerWidth gets the width of the outside of the browser window. It represents the width of the whole browser window including sidebar (if expanded), window chrome and window resizing borders/handles.

The state of javascript is such that one cannot rely on a specific meaning for outerWidth in every browser on every platform.

outerWidth is not well supported on older mobile browsers, though it enjoys support across major desktop browsers and most newer smart phone browsers.

As ausi pointed out, matchMedia would be a great choice as CSS is better standardised (matchMedia uses JS to read the viewport values detected by CSS). But even with accepted standards, retarded browsers still exist that ignore them (IE < 10 in this case, which makes matchMedia not very useful at least until XP dies).

In summary, if you are only developing for desktop browsers and newer mobile browsers, outerWidth should give you what you are looking for, with some caveats.

How do I post form data with fetch api?

To add on the good answers above you can also avoid setting explicitly the action in HTML and use an event handler in javascript, using "this" as the form to create the "FormData" object

Html form :

<form id="mainForm" class="" novalidate>
<!--Whatever here...-->
</form>

In your JS :

$("#mainForm").submit(function( event ) {
  event.preventDefault();
  const formData = new URLSearchParams(new FormData(this));
  fetch("http://localhost:8080/your/server",
    {   method: 'POST',
        mode : 'same-origin',
        credentials: 'same-origin' ,
        body : formData
    })
    .then(function(response) {
      return response.text()
    }).then(function(text) {
        //text is the server's response
    });
});

Ignoring new fields on JSON objects using Jackson

@JsonIgnoreProperties(ignoreUnknown = true) worked well for me. I have a java application which runs on tomcat with jdk 1.7.

How do I use a char as the case in a switch-case?

Here's an example:

public class Main {

    public static void main(String[] args) {

        double val1 = 100;
        double val2 = 10;
        char operation = 'd';
        double result = 0;

        switch (operation) {

            case 'a':
                result = val1 + val2; break;

            case 's':
                result = val1 - val2; break;
            case 'd':
                if (val2 != 0)
                    result = val1 / val2; break;
            case 'm':
                result = val1 * val2; break;

            default: System.out.println("Not a defined operation");


        }

        System.out.println(result);
    }
}

One line if in VB .NET

If (condition, condition_is_true, condition_is_false)

It will look like this in longer version:

If (condition_is_true) Then 

Else (condition_is_false)

End If

if condition in sql server update query

this worked great:

UPDATE
    table_Name
SET 
  column_A = CASE WHEN @flag = '1' THEN column_A + @new_value ELSE column_A END,
  column_B = CASE WHEN @flag = '0' THEN column_B + @new_value ELSE column_B END
WHERE
    ID = @ID

If my interface must return Task what is the best way to have a no-operation implementation?

To add to Reed Copsey's answer about using Task.FromResult, you can improve performance even more if you cache the already completed task since all instances of completed tasks are the same:

public static class TaskExtensions
{
    public static readonly Task CompletedTask = Task.FromResult(false);
}

With TaskExtensions.CompletedTask you can use the same instance throughout the entire app domain.

The latest version of the .Net Framework (v4.6) adds just that with the Task.CompletedTask static property

Task completedTask = Task.CompletedTask;

Add & delete view from Layout

This is the best way

LinearLayout lp = new LinearLayout(this);
lp.addView(new Button(this));
lp.addView(new ImageButton(this));
// Now remove them 
lp.removeViewAt(0); // and so on

If you have xml layout then no need to add dynamically.just call

lp.removeViewAt(0);

Eclipse reported "Failed to load JNI shared library"

Yep, in Windows 7 64 bit you have C:\Program Files and C:\Program Files (x86). You can find Java folders in both of them, but you must add C:\Program Files\Java\jre7\bin to environment variable PATH.

changing minDate option in JQuery DatePicker not working

Say we have two date select fields, field1, and field2. field2 date depends on field1

$('#field2').datepicker();
$('#field1').datepicker({
  onSelect: function(dateText, inst) {
    $('#field2').val("");
    $('#field2').datepicker("option", "minDate", new Date(dateText));
  }
});

How to change the Eclipse default workspace?

Open a command prompt. Change to the eclipse home directory and type "eclipse -clean" e.g. C:/eclipse>eclipse -clean

This will ask for the workspace selection. It will also force to set it as the default workspace.

Then, go to eclipsehome-->configuration-->settings folder.

open org.eclipse.ui.de.prefs in a notepad.

set this property to true from false.

SHOW_WORKSPACE_SELECTION_DIALOG=true

You will be asked for a workspace selection everytime.

Angular.js ng-repeat filter by property having one of multiple values (OR of values)

Here is a way to do it while passing in an extra argument:

https://stackoverflow.com/a/17813797/4533488 (thanks to Denis Pshenov)

<div ng-repeat="group in groups">
    <li ng-repeat="friend in friends | filter:weDontLike(group.enemy.name)">
        <span>{{friend.name}}</span>
    <li>
</div>

With the backend:

$scope.weDontLike = function(name) {
    return function(friend) {
        return friend.name != name;
    }
}

And yet another way with an in-template filter only:

https://stackoverflow.com/a/12528093/4533488 (thanks to mikel)

<div ng:app>
  <div ng-controller="HelloCntl">
    <ul>
       <li ng-repeat="friend in friends | filter:{name:'!Adam'}">
            <span>{{friend.name}}</span>
            <span>{{friend.phone}}</span>
        </li>
    </ul>
</div>

Create Elasticsearch curl query for not null and not empty("")

You can use a bool combination query with must/must_not which gives great performance and returns all records where the field is not null and not empty.

bool must_not is like "NOT AND" which means field!="", bool must exist means its !=null.

so effectively enabling: where field1!=null and field1!=""

GET  IndexName/IndexType/_search
{
    "query": {
        "bool": {
            "must": [{
                "bool": {
                    "must_not": [{
                        "term": { "YourFieldName": ""}
                    }]
                }
            }, {
                "bool": {
                    "must": [{
                      "exists" : { "field" : "YourFieldName" }
                    }]
                }
            }]
        }   
    }
}

ElasticSearch Version:

  "version": {
    "number": "5.6.10",
    "lucene_version": "6.6.1"
  }

Installing SciPy and NumPy using pip

you need the libblas and liblapack dev packages if you are using Ubuntu.

aptitude install libblas-dev liblapack-dev
pip install scipy

How do I count the number of occurrences of a char in a String?

You can use the split() function in just one line code

int noOccurence=string.split("#",-1).length-1;

How to properly add include directories with CMake

Add include_directories("/your/path/here").

This will be similar to calling gcc with -I/your/path/here/ option.

Make sure you put double quotes around the path. Other people didn't mention that and it made me stuck for 2 days. So this answer is for people who are very new to CMake and very confused.

ImportError: No module named pythoncom

If you're on windows you probably want the pywin32 library, which includes pythoncom and a whole lot of other stuff that is pretty standard.

MySQL query finding values in a comma separated string

You should actually fix your database schema so that you have three tables:

shirt: shirt_id, shirt_name
color: color_id, color_name
shirtcolor: shirt_id, color_id

Then if you want to find all of the shirts that are red, you'd do a query like:

SELECT *
FROM shirt, color
WHERE color.color_name = 'red'
  AND shirt.shirt_id = shirtcolor.shirt_id
  AND color.color_id = shirtcolor.color_id

Version of Apache installed on a Debian machine

You can use apachectl -V or apachectl -v. Both of them will return the Apache version information!

_x000D_

    xgqfrms:~/workspace $ apachectl -v_x000D_
_x000D_
    Server version: Apache/2.4.7 (Ubuntu)_x000D_
    Server built:   Jul 15 2016 15:34:04_x000D_
_x000D_
_x000D_
    xgqfrms:~/workspace $ apachectl -V_x000D_
_x000D_
    Server version: Apache/2.4.7 (Ubuntu)_x000D_
    Server built:   Jul 15 2016 15:34:04_x000D_
    Server's Module Magic Number: 20120211:27_x000D_
    Server loaded:  APR 1.5.1-dev, APR-UTIL 1.5.3_x000D_
    Compiled using: APR 1.5.1-dev, APR-UTIL 1.5.3_x000D_
    Architecture:   64-bit_x000D_
    Server MPM:     prefork_x000D_
      threaded:     no_x000D_
        forked:     yes (variable process count)_x000D_
    Server compiled with...._x000D_
     -D APR_HAS_SENDFILE_x000D_
     -D APR_HAS_MMAP_x000D_
     -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)_x000D_
     -D APR_USE_SYSVSEM_SERIALIZE_x000D_
     -D APR_USE_PTHREAD_SERIALIZE_x000D_
     -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT_x000D_
     -D APR_HAS_OTHER_CHILD_x000D_
     -D AP_HAVE_RELIABLE_PIPED_LOGS_x000D_
     -D DYNAMIC_MODULE_LIMIT=256_x000D_
     -D HTTPD_ROOT="/etc/apache2"_x000D_
     -D SUEXEC_BIN="/usr/lib/apache2/suexec"_x000D_
     -D DEFAULT_PIDLOG="/var/run/apache2.pid"_x000D_
     -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"_x000D_
     -D DEFAULT_ERRORLOG="logs/error_log"_x000D_
     -D AP_TYPES_CONFIG_FILE="mime.types"_x000D_
     -D SERVER_CONFIG_FILE="apache2.conf"

_x000D_

You may be more like using apache2 -V or apache2 -v. It seems easier to remember!

_x000D_

    xgqfrms:~/workspace $ apache2 -v_x000D_
_x000D_
    Server version: Apache/2.4.7 (Ubuntu)_x000D_
    Server built:   Jul 15 2016 15:34:04_x000D_
_x000D_
_x000D_
    xgqfrms:~/workspace $ apache2 -V_x000D_
_x000D_
    Server version: Apache/2.4.7 (Ubuntu)_x000D_
    Server built:   Jul 15 2016 15:34:04_x000D_
    Server's Module Magic Number: 20120211:27_x000D_
    Server loaded:  APR 1.5.1-dev, APR-UTIL 1.5.3_x000D_
    Compiled using: APR 1.5.1-dev, APR-UTIL 1.5.3_x000D_
    Architecture:   64-bit_x000D_
    Server MPM:     prefork_x000D_
      threaded:     no_x000D_
        forked:     yes (variable process count)_x000D_
    Server compiled with...._x000D_
     -D APR_HAS_SENDFILE_x000D_
     -D APR_HAS_MMAP_x000D_
     -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)_x000D_
     -D APR_USE_SYSVSEM_SERIALIZE_x000D_
     -D APR_USE_PTHREAD_SERIALIZE_x000D_
     -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT_x000D_
     -D APR_HAS_OTHER_CHILD_x000D_
     -D AP_HAVE_RELIABLE_PIPED_LOGS_x000D_
     -D DYNAMIC_MODULE_LIMIT=256_x000D_
     -D HTTPD_ROOT="/etc/apache2"_x000D_
     -D SUEXEC_BIN="/usr/lib/apache2/suexec"_x000D_
     -D DEFAULT_PIDLOG="/var/run/apache2.pid"_x000D_
     -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"_x000D_
     -D DEFAULT_ERRORLOG="logs/error_log"_x000D_
     -D AP_TYPES_CONFIG_FILE="mime.types"_x000D_
     -D SERVER_CONFIG_FILE="apache2.conf"

_x000D_

How to write files to assets folder or raw folder in android?

It cannot be done. It is impossible.

Unable to install Android Studio in Ubuntu

Checkout this page

If you are running a 64-bit distribution on your development machine, you need to install additional packages first. For Ubuntu 13.10 (Saucy Salamander) and above, install the libncurses5:i386, libstdc++6:i386, and zlib1g:i386 packages using apt-get:

sudo dpkg --add-architecture i386
sudo apt-get update
sudo apt-get install libncurses5:i386 libstdc++6:i386 zlib1g:i386

How to serialize object to CSV file?

Worth mentioning that the handlebar library https://github.com/jknack/handlebars.java can trivialize many transformation tasks include toCSV.

Android WSDL/SOAP service client

i founded this tool to auto generate wsdl to android code,

http://www.wsdl2code.com/Example.aspx

public void callWebService(){
    SampleService srv1 = new SampleService();
    Request req = new Request();
    req.companyId = "1";
    req.userName = "userName";
    req.password = "pas";
    Response response =  srv1.ServiceSample(req);
}

Calculating time difference between 2 dates in minutes

ROUND(time_to_sec((TIMEDIFF(NOW(), "2015-06-10 20:15:00"))) / 60);

Converting a sentence string to a string array of words in Java

I already did post this answer somewhere, i will do it here again. This version doesn't use any major inbuilt method. You got the char array, convert it into a String. Hope it helps!

import java.util.Scanner;

public class SentenceToWord 
{
    public static int getNumberOfWords(String sentence)
    {
        int counter=0;
        for(int i=0;i<sentence.length();i++)
        {
            if(sentence.charAt(i)==' ')
            counter++;
        }
        return counter+1;
    }

    public static char[] getSubString(String sentence,int start,int end) //method to give substring, replacement of String.substring() 
    {
        int counter=0;
        char charArrayToReturn[]=new char[end-start];
        for(int i=start;i<end;i++)
        {
            charArrayToReturn[counter++]=sentence.charAt(i);
        }
        return charArrayToReturn;
    }

    public static char[][] getWordsFromString(String sentence)
    {
        int wordsCounter=0;
        int spaceIndex=0;
        int length=sentence.length();
        char wordsArray[][]=new char[getNumberOfWords(sentence)][]; 
        for(int i=0;i<length;i++)
        {
            if(sentence.charAt(i)==' ' || i+1==length)
            {
            wordsArray[wordsCounter++]=getSubString(sentence, spaceIndex,i+1); //get each word as substring
            spaceIndex=i+1; //increment space index
            }
        }
        return  wordsArray; //return the 2 dimensional char array
    }


    public static void main(String[] args) 
    {
    System.out.println("Please enter the String");
    Scanner input=new Scanner(System.in);
    String userInput=input.nextLine().trim();
    int numOfWords=getNumberOfWords(userInput);
    char words[][]=new char[numOfWords+1][];
    words=getWordsFromString(userInput);
    System.out.println("Total number of words found in the String is "+(numOfWords));
    for(int i=0;i<numOfWords;i++)
    {
        System.out.println(" ");
        for(int j=0;j<words[i].length;j++)
        {
        System.out.print(words[i][j]);//print out each char one by one
        }
    }
    }

}

Differences between Ant and Maven

Just to list some more differences:

Ant doesn't have formal conventions. You have to tell Ant exactly where to find the source, where to put the outputs, etc.
Ant is procedural. You have to tell Ant exactly what to do; tell it to compile, copy, then compress, etc.
Ant doesn't have a lifecycle.
Maven uses conventions. It knows where your source code is automatically, as long as you follow these conventions. You don't need to tell Maven where it is.
Maven is declarative; All you have to do is create a pom.xml file and put your source in the default directory. Maven will take care of the rest.
Maven has a lifecycle. You simply call mvn install and a series of sequence steps are executed.
Maven has intelligence about common project tasks. To run tests, simple execute mvn test, as long as the files are in the default location. In Ant, you would first have to JUnit JAR file is, then create a classpath that includes the JUnit JAR, then tell Ant where it should look for test source code, write a goal that compiles the test source and then finally execute the unit tests with JUnit.

Update:

This came from Maven: The Definitive Guide. Sorry, I totally forgot to cite it.

Determine command line working directory when running node bin script

path.resolve('.') is also a reliable and clean option, because we almost always require('path'). It will give you absolute path of the directory from where it is called.

PHP form - on submit stay on same page

You have to use code similar to this:

echo "<div id='divwithform'>";

if(isset($_POST['submit']))  // if form was submitted (if you came here with form data)
{
    echo "Success";
}
else                // if form was not submitted (if you came here without form data)
{
    echo "<form> ... </form>";
} 

echo "</div>";

Code with if like this is typical for many pages, however this is very simplified.

Normally, you have to validate some data in first "if" (check if form fields were not empty etc).

Please visit www.thenewboston.org or phpacademy.org. There are very good PHP video tutorials, including forms.

How to search for occurrences of more than one space between words in a line

This regex selects all spaces, you can use this and replace it with a single space

\s+

example in python

result = re.sub('\s+',' ', data))

Using 'starts with' selector on individual class names

If an element has multiples classes "[class^='apple-']" dosen't work, e.g.

<div class="fruits apple-monkey"></div>

Iterate all files in a directory using a 'for' loop

Here's my go with comments in the code.

I'm just brushing up by biatch skills so forgive any blatant errors.

I tried to write an all in one solution as best I can with a little modification where the user requires it.

Some important notes: Just change the variable recursive to FALSE if you only want the root directories files and folders processed. Otherwise, it goes through all folders and files.

C&C most welcome...

@echo off
title %~nx0
chcp 65001 >NUL
set "dir=c:\users\%username%\desktop"
::
:: Recursive Loop routine - First Written by Ste on - 2020.01.24 - Rev 1
::
setlocal EnableDelayedExpansion
rem THIS IS A RECURSIVE SOLUTION [ALBEIT IF YOU CHANGE THE RECURSIVE TO FALSE, NO]
rem By removing the /s switch from the first loop if you want to loop through
rem the base folder only.
set recursive=TRUE
if %recursive% equ TRUE ( set recursive=/s ) else ( set recursive= )
endlocal & set recursive=%recursive%
cd /d %dir%
echo Directory %cd%
for %%F in ("*") do (echo    ? %%F)                                 %= Loop through the current directory. =%
for /f "delims==" %%D in ('dir "%dir%" /ad /b %recursive%') do (    %= Loop through the sub-directories only if the recursive variable is TRUE. =%
  echo Directory %%D
  echo %recursive% | find "/s" >NUL 2>NUL && (
    pushd %%D
    cd /d %%D
    for /f "delims==" %%F in ('dir "*" /b') do (                      %= Then loop through each pushd' folder and work on the files and folders =%
      echo %%~aF | find /v "d" >NUL 2>NUL && (                        %= This will weed out the directories by checking their attributes for the lack of 'd' with the /v switch therefore you can now work on the files only. =%
      rem You can do stuff to your files here.
      rem Below are some examples of the info you can get by expanding the %%F variable.
      rem Uncomment one at a time to see the results.
      echo    ? %%~F           &rem expands %%F removing any surrounding quotes (")
      rem echo    ? %%~dF          &rem expands %%F to a drive letter only
      rem echo    ? %%~fF          &rem expands %%F to a fully qualified path name
      rem echo    ? %%~pF          &rem expands %%A to a path only
      rem echo    ? %%~nF          &rem expands %%F to a file name only
      rem echo    ? %%~xF          &rem expands %%F to a file extension only
      rem echo    ? %%~sF          &rem expanded path contains short names only
      rem echo    ? %%~aF          &rem expands %%F to file attributes of file
      rem echo    ? %%~tF          &rem expands %%F to date/time of file
      rem echo    ? %%~zF          &rem expands %%F to size of file
      rem echo    ? %%~dpF         &rem expands %%F to a drive letter and path only
      rem echo    ? %%~nxF         &rem expands %%F to a file name and extension only
      rem echo    ? %%~fsF         &rem expands %%F to a full path name with short names only
      rem echo    ? %%~dp$dir:F    &rem searches the directories listed in the 'dir' environment variable and expands %%F to the fully qualified name of the first one found. If the environment variable name is not defined or the file is not found by the search, then this modifier expands to the empty string
      rem echo    ? %%~ftzaF       &rem expands %%F to a DIR like output line
      )
      )
    popd
    )
  )
echo/ & pause & cls

How to set zoom level in google map

Your code below is zooming the map to fit the specified bounds:

addMarker(27.703402,85.311668,'New Road');
center = bounds.getCenter();
map.fitBounds(bounds);

If you only have 1 marker and add it to the bounds, that results in the closest zoom possible:

function addMarker(lat, lng, info) {
  var pt = new google.maps.LatLng(lat, lng);
  bounds.extend(pt);
}

If you keep track of the number of markers you have "added" to the map (or extended the bounds with), you can only call fitBounds if that number is greater than one. I usually push the markers into an array (for later use) and test the length of that array.

If you will only ever have one marker, don't use fitBounds. Call setCenter, setZoom with the marker position and your desired zoom level.

function addMarker(lat, lng, info) {
  var pt = new google.maps.LatLng(lat, lng);
  map.setCenter(pt);
  map.setZoom(your desired zoom);
}

_x000D_

html,
body,
#map {
  height: 100%;
  width: 100%;
  padding: 0;
  margin: 0;
}

_x000D_

<html>

<head>
  <script src="http://maps.google.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk" type="text/javascript"></script>
  <script type="text/javascript">
    var icon = new google.maps.MarkerImage("http://maps.google.com/mapfiles/ms/micons/blue.png", new google.maps.Size(32, 32), new google.maps.Point(0, 0), new google.maps.Point(16, 32));
    var center = null;
    var map = null;
    var currentPopup;
    var bounds = new google.maps.LatLngBounds();

    function addMarker(lat, lng, info) {
      var pt = new google.maps.LatLng(lat, lng);
      map.setCenter(pt);
      map.setZoom(5);
      var marker = new google.maps.Marker({
        position: pt,
        icon: icon,
        map: map
      });
      var popup = new google.maps.InfoWindow({
        content: info,
        maxWidth: 300
      });
      google.maps.event.addListener(marker, "click", function() {
        if (currentPopup != null) {
          currentPopup.close();
          currentPopup = null;
        }
        popup.open(map, marker);
        currentPopup = popup;
      });
      google.maps.event.addListener(popup, "closeclick", function() {
        map.panTo(center);
        currentPopup = null;
      });
    }

    function initMap() {
      map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(0, 0),
        zoom: 1,
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        mapTypeControl: false,
        mapTypeControlOptions: {
          style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR
        },
        navigationControl: true,
        navigationControlOptions: {
          style: google.maps.NavigationControlStyle.SMALL
        }
      });
      addMarker(27.703402, 85.311668, 'New Road');
      // center = bounds.getCenter();
      // map.fitBounds(bounds);

    }
  </script>
</head>

<body onload="initMap()" style="margin:0px; border:0px; padding:0px;">
  <div id="map"></div>
</body>

</html>

_x000D_

Why must wait() always be in synchronized block

directly from this java oracle tutorial:

When a thread invokes d.wait, it must own the intrinsic lock for d — otherwise an error is thrown. Invoking wait inside a synchronized method is a simple way to acquire the intrinsic lock.

Android charting libraries

AchartEngine

You can create a plethora of different chart types relatively quickly with loads of customizable options.

file path Windows format to java format

String path = "C:\\Documents and Settings\\Manoj\\Desktop";
path = path.replace("\\", "/");
// or
path = path.replaceAll("\\\\", "/");

Find more details in the Docs

How to compress image size?

Use Compressor (Image compression library). Visit zetbaitsu/Compressor for code and documentation.

add dependency in gradle (app level)

dependencies {
    implementation 'id.zelory:compressor:3.0.0'
}

To Compress Image use one of these approaches:

Compress Image File:

      val compressedImageFile = Compressor.compress(context, actualImageFile)

Compress Image File to Bitmap:

      val compressedImageFile = Compressor.compress(context, actualImageFile)
      val bitmap = BitmapFactory.decodeFile(compressedImageFile.path)

CSS technique for a horizontal line with words in the middle

Solution for IE8 and newer...

Issues worth noting:

Using background-color to mask a border might not be the best solution. If you have a complex (or unknown) background color (or image), masking will ultimately fail. Also, if you resize the text, you'll notice that white background color (or whatever you set) will start covering up the text on the line above (or below).

You also don't want to "guesstimate" how wide the the sections are either, because it makes the styles very inflexible and almost impossible to implement on a responsive site where the width of the content is changing.

Solution:

(View JSFiddle)

Instead of "masking" a border with a background-color, use your display property.

HTML

<div class="group">
    <div class="item line"></div>
    <div class="item text">This is a test</div>
    <div class="item line"></div>
</div>

CSS

.group { display: table; width: 100%; }
.item { display: table-cell; }
.text { white-space: nowrap; width: 1%; padding: 0 10px; }
.line { border-bottom: 1px solid #000; position: relative; top: -.5em; }

Resize your text by placing your font-size property on the .group element.

Limitations:

No multi-line text. Single lines only.
HTML markup isn't as elegant
top property on .line element needs to be half of line-height. So, if you have a line-height of 1.5em, then the top should be -.75em. This is a limitation because it's not automated, and if you are applying these styles on elements with different line-heights, then you might need to reapply your line-height style.

For me, these limitations outweigh the "issues" I noted at the beginning of my answer for most implementations.

Store a closure as a variable in Swift

In Swift 4 and 5. I created a closure variable containing two parameter dictionary and bool.

 var completionHandler:([String:Any], Bool)->Void = { dict, success  in
    if success {
      print(dict)
    }
  }

Calling the closure variable

self.completionHandler(["name":"Gurjinder singh"],true)

What JSON library to use in Scala?

I use PLAY JSON library you can find the mavn repo for only the JSON library not the whole framework here

    val json = "com.typesafe.play" %% "play-json" % version
    val typesafe = "typesafe.com" at "http://repo.typesafe.com/typesafe/releases/"

A very good tutorials about how to use them, are available here:

http://mandubian.com/2012/09/08/unveiling-play-2-dot-1-json-api-part1-jspath-reads-combinators/

http://mandubian.com/2012/10/01/unveiling-play-2-dot-1-json-api-part2-writes-format-combinators/

http://mandubian.com/2012/10/29/unveiling-play-2-dot-1-json-api-part3-json-transformers/

"Fatal error: Unable to find local grunt." when running "grunt" command

I had the same issue today on windows 32 bit,with node 0.10.25, and grunt 0.4.5.

I followed dongho's answer, with just few extra steps. here are the steps I used to solve the error:

1) create your package.json

$ npm init

2) install grunt for this project, this will be installed under node_modules/. --save-dev will add this module to devDependency in your package.json

$ npm install grunt --save-dev

3) then create gruntfile.js , with a sample code like this:

module.exports = function(grunt) {

  grunt.initConfig({
    jshint: {
      files: ['Gruntfile.js', 'src/**/*.js', 'test/**/*.js'],
      options: {
        globals: {
          jQuery: true
        }
      }
    },
    watch: {
      files: ['<%= jshint.files %>'],
      tasks: ['jshint']
    }
  });

  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-watch');

  grunt.registerTask('default', ['jshint']);

};

here, src/**/*.js and test/**/*.js should be the paths to actual JS files you are using in your project

4) run npm install grunt-contrib-jshint --save-dev

5) run npm install grunt-contrib-watch --save-dev

6) run $ grunt

Note: when you require common package like concat, uglify etc, you need to add those modules via npm install, just the way we installed jshint and watch in step 4 & 5

Spring - applicationContext.xml cannot be opened because it does not exist

If you use maven, create a directory called resources in the main directory, and then copy your applicationContext.xml into it.

From your java code call:

ApplicationContext appCtx = new ClassPathXmlApplicationContext("applicationContext.xml");

Resize an Array while keeping current elements in Java?

You can try below solution inside some class:

int[] a = {10, 20, 30, 40, 50, 61};

// private visibility - or change it as needed
private void resizeArray(int newLength) {
    a = Arrays.copyOf(a, a.length + newLength);
    System.out.println("New length: " + a.length);
}

Certificate is trusted by PC but not by Android

You have to create a crt bundle then it will be fine. You will be receiving three crt files. Use them all! If you only used the domain.crt then there will be warning on android but not on PC.

I am on nginx. I opened domain_name.crt and then opened positivesslca2.crt, select all and copy to the end of domain_name.crt. Then open AddTrustExternalCARoot.crt, copy to the end of domain_name.crt again. Then install the domain_name.crt

works good.

How do I name the "row names" column in r

The tibble package now has a dedicated function that converts row names to an explicit variable.

library(tibble)
rownames_to_column(mtcars, var="das_Auto") %>% head

Gives:

           das_Auto  mpg cyl disp  hp drat    wt  qsec vs am gear carb
1         Mazda RX4 21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
2     Mazda RX4 Wag 21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
3        Datsun 710 22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
4    Hornet 4 Drive 21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
5 Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
6           Valiant 18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

Maven won't run my Project : Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exec

I solved this issue with right click on project -> Set as Main Project.

Invalid length parameter passed to the LEFT or SUBSTRING function

That would only happen if PostCode is missing a space. You could add conditionality such that all of PostCode is retrieved should a space not be found as follows

select SUBSTRING(PostCode, 1 ,
case when  CHARINDEX(' ', PostCode ) = 0 then LEN(PostCode) 
else CHARINDEX(' ', PostCode) -1 end)

Why an inline "background-image" style doesn't work in Chrome 10 and Internet Explorer 8?

As c-smile mentioned: Just need to remove the apostrophes in the url():

<div style="background-image: url(http://i54.tinypic.com/4zuxif.jpg)"></div>

Demo here

Excel compare two columns and highlight duplicates

A simple formula to use is

=COUNTIF($B:$B,A1)

Formula specified is for cell A1. Simply copy and paste special - format to the whole of column A

REST - HTTP Post Multipart with JSON

If I understand you correctly, you want to compose a multipart request manually from an HTTP/REST console. The multipart format is simple; a brief introduction can be found in the HTML 4.01 spec. You need to come up with a boundary, which is a string not found in the content, let’s say HereGoes. You set request header Content-Type: multipart/form-data; boundary=HereGoes. Then this should be a valid request body:

--HereGoes
Content-Disposition: form-data; name="myJsonString"
Content-Type: application/json

{"foo": "bar"}
--HereGoes
Content-Disposition: form-data; name="photo"
Content-Type: image/jpeg
Content-Transfer-Encoding: base64

<...JPEG content in base64...>
--HereGoes--

How to change the URI (URL) for a remote Git repository?

To change the remote upstream: git remote set-url origin <url>

To add more upstreams: git remote add newplace <url>

So you can choose where to work git push origin <branch> or git push newplace <branch>

AJAX jQuery refresh div every 5 seconds

Try to not use setInterval.
You can resend request to server after successful response with timeout.
jQuery:

sendRequest(); //call function

function sendRequest(){
    $.ajax({
        url: "test.php",
        success: 
        function(result){
            $('#links').text(result); //insert text of test.php into your div
            setTimeout(function(){
                sendRequest(); //this will send request again and again;
            }, 5000);
        }
    });
}

Get access to parent control from user control - C#

According to Ruskins answer and the comments here I came up with the following (recursive) solution:

public static T GetParentOfType<T>(this Control control) where T : class
{
    if (control?.Parent == null)
        return null;

    if (control.Parent is T parent)
        return parent;

    return GetParentOfType<T>(control.Parent);
}

Add column in dataframe from list

A solution improving on the great one from @sparrow.

Let df, be your dataset, and mylist the list with the values you want to add to the dataframe.

Let's suppose you want to call your new column simply, new_column

First make the list into a Series:

column_values = pd.Series(mylist)

Then use the insert function to add the column. This function has the advantage to let you choose in which position you want to place the column. In the following example we will position the new column in the first position from left (by setting loc=0)

df.insert(loc=0, column='new_column', value=column_values)

How to convert date format to milliseconds?

You could use

Calendar cal = Calendar.getInstance();
cal.setTime(beginupd);
long millis = cal.getTimeInMillis();

Multiline strings in VB.NET

Multi-line string literals in vb.net using the XElement class.

Imports System.Xml.Linq

Public Sub Test()

dim sOderBy as string = ""

dim xe as XElement = <SQL>
                SELECT * FROM <%= sTableName %>
                 <ORDER_BY> ORDER BY <%= sOrderBy %></ORDER_BY>
                 </SQL>

'** conditionally remove a section 
if sOrderBy.Length = 0 then xe.<ORDER BY>.Remove

'** convert XElement value to a string 
dim sSQL as String = xe.Value

End Sub

How can I get current location from user in iOS

In iOS 6, the

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

is deprecated.

Use following code instead

- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray *)locations {
    CLLocation *location = [locations lastObject];
    NSLog(@"lat%f - lon%f", location.coordinate.latitude, location.coordinate.longitude);
}

For iOS 6~8, the above method is still necessary, but you have to handle authorization.

_locationManager = [CLLocationManager new];
_locationManager.delegate = self;
_locationManager.distanceFilter = kCLDistanceFilterNone;
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0 &&
    [CLLocationManager authorizationStatus] != kCLAuthorizationStatusAuthorizedWhenInUse
    //[CLLocationManager authorizationStatus] != kCLAuthorizationStatusAuthorizedAlways
   ) {
     // Will open an confirm dialog to get user's approval 
    [_locationManager requestWhenInUseAuthorization]; 
    //[_locationManager requestAlwaysAuthorization];
} else {
    [_locationManager startUpdatingLocation]; //Will update location immediately 
}

This is the delegate method which handle user's authorization

#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager*)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
    switch (status) {
    case kCLAuthorizationStatusNotDetermined: {
        NSLog(@"User still thinking..");
    } break;
    case kCLAuthorizationStatusDenied: {
        NSLog(@"User hates you");
    } break;
    case kCLAuthorizationStatusAuthorizedWhenInUse:
    case kCLAuthorizationStatusAuthorizedAlways: {
        [_locationManager startUpdatingLocation]; //Will update location immediately
    } break;
    default:
        break;
    }
}

Error: unable to verify the first certificate in nodejs

I was using nodemailer npm module. The below code solved the issue

     tls: {
     // do not fail on invalid certs
     rejectUnauthorized: false
     }

Linq to Sql: Multiple left outer joins

I think you should be able to follow the method used in this post. It looks really ugly, but I would think you could do it twice and get the result you want.

I wonder if this is actually a case where you'd be better off using DataContext.ExecuteCommand(...) instead of converting to linq.

How to switch text case in visual studio code

I've written a Visual Studio Code extension for changing case (not only upper case, many other options): https://github.com/wmaurer/vscode-change-case

To map the upper case command to a keybinding (e.g. Ctrl+T U), click File -> Preferences -> Keyboard shortcuts, and insert the following into the json config:

{
  "key": "ctrl+t u",
  "command": "extension.changeCase.upper",
  "when": "editorTextFocus"
}

EDIT:

With the November 2016 (release notes) update of VSCode, there is built-in support for converting to upper case and lower case via the commands editor.action.transformToUppercase and editor.action.transformToLowercase. These don't have default keybindings.

The change-case extension is still useful for other text transformations, e.g. camelCase, PascalCase, snake-case, etc.

Where can I find the Java SDK in Linux after installing it?

Use find to located it. It should be under /usr somewhere:

find /usr -name java

When running the command, if there are too many "Permission denied" message obfuscating the actual found results then, simply redirect stderr to /dev/null

find /usr -name java 2> /dev/null

R legend placement in a plot

You have to add the size of the legend box to the ylim range

#Plot an empty graph and legend to get the size of the legend
x <-1:10
y <-11:20
plot(x,y,type="n", xaxt="n", yaxt="n")
my.legend.size <-legend("topright",c("Series1","Series2","Series3"),plot = FALSE)

#custom ylim. Add the height of legend to upper bound of the range
my.range <- range(y)
my.range[2] <- 1.04*(my.range[2]+my.legend.size$rect$h)

#draw the plot with custom ylim
plot(x,y,ylim=my.range, type="l")
my.legend.size <-legend("topright",c("Series1","Series2","Series3"))

enter image description here

HTTP Status 405 - Request method 'POST' not supported (Spring MVC)

Check if you are returning a @ResponseBody or a @ResponseStatus

I had a similar problem. My Controller looked like that:

@RequestMapping(value="/user", method = RequestMethod.POST)
public String updateUser(@RequestBody User user){
    return userService.updateUser(user).getId();
}

When calling with a POST request I always got the following error:

HTTP Status 405 - Request method 'POST' not supported

After a while I figured out that the method was actually called, but because there is no @ResponseBody and no @ResponseStatus Spring MVC raises the error.

To fix this simply add a @ResponseBody

@RequestMapping(value="/user", method = RequestMethod.POST)
public @ResponseBody String updateUser(@RequestBody User user){
    return userService.updateUser(user).getId();
}

or a @ResponseStatus to your method.

@RequestMapping(value="/user", method = RequestMethod.POST)
@ResponseStatus(value=HttpStatus.OK)
public String updateUser(@RequestBody User user){
    return userService.updateUser(user).getId();
}

No 'Access-Control-Allow-Origin' header is present on the requested resource - Resteasy

Your resource methods won't get hit, so their headers will never get set. The reason is that there is what's called a preflight request before the actual request, which is an OPTIONS request. So the error comes from the fact that the preflight request doesn't produce the necessary headers.

For RESTeasy, you should use CorsFilter. You can see here for some example how to configure it. This filter will handle the preflight request. So you can remove all those headers you have in your resource methods.

See Also:

HTTP access control (CORS)

Django Cookies, how can I set them?

Anyone interested in doing this should read the documentation of the Django Sessions framework. It stores a session ID in the user's cookies, but maps all the cookies-like data to your database. This is an improvement on the typical cookies-based workflow for HTTP requests.

Here is an example with a Django view ...

def homepage(request):

    request.session.setdefault('how_many_visits', 0)
    request.session['how_many_visits'] += 1

    print(request.session['how_many_visits'])

    return render(request, 'home.html', {})

If you keep visiting the page over and over, you'll see the value start incrementing up from 1 until you clear your cookies, visit on a new browser, go incognito, or do anything else that sidesteps Django's Session ID cookie.

Underscore prefix for property and method names in JavaScript

JSDoc 3 allows you to annotate your functions with the @access private (previously the @private tag) which is also useful for broadcasting your intent to other developers - http://usejsdoc.org/tags-access.html

Add one day to date in javascript

var datatoday = new Date();
var datatodays = datatoday.setDate(new Date(datatoday).getDate() + 1);
todate = new Date(datatodays);
console.log(todate);

This will help you...

Dynamic loading of images in WPF

It is because the Creation was delayed. If you want the picture to be loaded immediately, you can simply add this code into the init phase.

src.CacheOption = BitmapCacheOption.OnLoad;

like this:

src.BeginInit();
src.UriSource = new Uri("picture.jpg", UriKind.Relative);
src.CacheOption = BitmapCacheOption.OnLoad;
src.EndInit();

Reading data from XML

Try GetElementsByTagName method of XMLDocument class to read specific data or LoadXml method to read all data to xml document.

Pass form data to another page with php

The best way to accomplish that is to use POST which is a method of Hypertext Transfer Protocol https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods

index.php

<html>
<body>

<form action="site2.php" method="post">
Name: <input type="text" name="name">
Email: <input type="text" name="email">
<input type="submit">
</form>

</body>
</html>

site2.php

 <html>
 <body>

 Hello <?php echo $_POST["name"]; ?>!<br>
 Your mail is <?php echo $_POST["mail"]; ?>.

 </body>
 </html>

output

Hello "name" !

Your email is "[email protected]" .

Android Studio does not show layout preview

Find Styles.xml in Values.(res/Values/Styles.xml) Change this

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

to this:

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

Then clean and build project. Both of those you can do from build menu.

It worked for me.

How does Django's Meta class work?

Extending on Tadeck's Django answer above, the use of 'class Meta:' in Django is just normal Python too.

The internal class is a convenient namespace for shared data among the class instances (hence the name Meta for 'metadata' but you can call it anything you like). While in Django it's generally read-only configuration stuff, there is nothing to stop you changing it:

In [1]: class Foo(object):
   ...:     class Meta:
   ...:         metaVal = 1
   ...:         
In [2]: f1 = Foo()
In [3]: f2 = Foo()
In [4]: f1.Meta.metaVal
Out[4]: 1
In [5]: f2.Meta.metaVal = 2
In [6]: f1.Meta.metaVal
Out[6]: 2
In [7]: Foo.Meta.metaVal
Out[7]: 2

You can explore it in Django directly too e.g:

In [1]: from django.contrib.auth.models import User
In [2]: User.Meta
Out[2]: django.contrib.auth.models.Meta
In [3]: User.Meta.__dict__
Out[3]: 
{'__doc__': None,
 '__module__': 'django.contrib.auth.models',
 'abstract': False,
 'verbose_name': <django.utils.functional.__proxy__ at 0x26a6610>,
 'verbose_name_plural': <django.utils.functional.__proxy__ at 0x26a6650>}

However, in Django you are more likely to want to explore the _meta attribute which is an Options object created by the model metaclass when a model is created. That is where you'll find all of the Django class 'meta' information. In Django, Meta is just used to pass information into the process of creating the _meta Options object.

Running multiple AsyncTasks at the same time -- not possible?

Making @sulai suggestion more generic :

@TargetApi(Build.VERSION_CODES.HONEYCOMB) // API 11
public static <T> void executeAsyncTask(AsyncTask<T, ?, ?> asyncTask, T... params) {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
        asyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params);
    else
        asyncTask.execute(params);
}

Programs & Examples On #Message queue

ActiveMQ or RabbitMQ or ZeroMQ or

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1. Download JDK 7

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