Run `npm root -g` to see the location, which varies. A common path is **/usr/local/lib/node_modules**.

For more info see the npm docs on [Global vs. Local installation][1]


  [1]: https://docs.npmjs.com/files/folders#global-installation

I need to set validation that user must fill / select all details in a page. If any fields are empty wanna show `Toast message to fill.` Now I need set validation for `RadioButton` in the `RadioGroup.` I tried this code but didn&#39;t work properly. Suggest me correct way. Thankyou.

    // get selected radio button from radioGroup
	int selectedId = gender.getCheckedRadioButtonId();
	// find the radiobutton by returned id
	selectedRadioButton = (RadioButton)findViewById(selectedId);
	// do what you want with radioButtonText (save it to database in your case)
	radioButtonText = selectedRadioButton.getText().toString();
			
	if(radioButtonText.matches(&quot;&quot;))
	{
		Toast.makeText(getApplicationContext(), &quot;Please select Gender&quot;, Toast.LENGTH_SHORT).show();
		Log.d(&quot;QAOD&quot;, &quot;Gender is Null&quot;);
	}
	else
	{
		Log.d(&quot;QAOD&quot;, &quot;Gender is Selected&quot;);
    }


How to check if a radiobutton is checked in a radiogroup in Android?

Can someone please tell me the recommended (up to date) way to get POSTed form data in express.

So many tutorials/ posts etc talk about bodyParser but this is no longer bundled with Express and other blogs etc recommend using urlencoded directly, but now this is not available either.

Trying to find accurate information on these frameworks or technologies is doing my head in.

BTW what I am intrerested in is very simple and small form data



Express js form data

Where is the default global node_modules folder on Ubuntu. For example where would this get installed: `npm install -g gulp`

Where do global npm packages get installed on Ubuntu

<p>Where is the default global node_modules folder on Ubuntu. For example where would this get installed: <code>npm install -g gulp</code></p>


 
onchange event is not working. What am I supposed to do to get result on same page. I dont want to redirect to any other page to upload image. Is this issue is because of opencart? I dont know if it is correct to write like this in cpanel. I am using opencart and cpanel. Is there any other way?

 **HTML**

     &lt;input type=&#39;file&#39; id=&quot;upload&quot; onchange=&quot;readURL(this.value)&quot; /&gt;
        &lt;img id=&quot;img&quot; src=&quot;#&quot; alt=&quot;your image&quot; /&gt;

**script**

    function readURL(input) {
    var url = input.value;
    var ext = url.substring(url.lastIndexOf(&#39;.&#39;) + 1).toLowerCase();
    if (input.files &amp;&amp; input.files[0]&amp;&amp; (ext == &quot;gif&quot; || ext == &quot;png&quot; || ext == &quot;jpeg&quot; || ext == &quot;jpg&quot;)) {
        var reader = new FileReader();

        reader.onload = function (e) {
            $(&#39;#img&#39;).attr(&#39;src&#39;, e.target.result);
        }
        reader.readAsDataURL(input.files[0]);
    }
    else{
         $(&#39;#img&#39;).attr(&#39;src&#39;, &#39;/assets/no_preview.png&#39;);
      }
    }


[JSFiddle](http://jsfiddle.net/Junkie/stN8U/)

onchange file input change img src and change image color

When pushing an array&#39;s contents to another array I get 

&gt; &quot;Uncaught TypeError: Cannot read property &#39;push&#39; of undefined&quot; error
&gt; in this snippet.

	var order = new Object(), stack = [];
	for(var i=0;i&lt;a.length;i++){
		if(parseInt(a[i].daysleft) == 0){ order[0].push(a[i]); }
		if(parseInt(a[i].daysleft) &gt; 0){ order[1].push(a[i]); }
		if(parseInt(a[i].daysleft) &lt; 0){ order[2].push(a[i]); }
	}

Why do I get this error in the second **if** statement ?
Thanks a lot!

Cannot read property &#39;push&#39; of undefined when combining arrays

Why can’t I access the component methods from “outside” in ReactJS? Why is it not possible and is there any way to solve it?

Consider the code:

    var Parent = React.createClass({
    	render: function() {
    		var child = &lt;Child /&gt;;
    		return (
    			&lt;div&gt;
    				{child.someMethod()} // expect &quot;bar&quot;, got a &quot;not a function&quot; error.
    			&lt;/div&gt;
    		);
    	}
    });

    var Child = React.createClass({
    	render: function() {
    		return (
    			&lt;div&gt;
    				foo
    			&lt;/div&gt;
    		);
    	},
    	someMethod: function() {
    		return &#39;bar&#39;;
    	}
    });
    
    React.renderComponent(&lt;Parent /&gt;, document.body);

How to access component methods from “outside” in ReactJS?

I dont want to allow users to access my site with Microsoft Internetexplorer (ANY VERSION).

What I&#180;ve found so far was to detect if it&#180;s lower or equal version 10.

A very annoing thing: Internetexplorer &gt;v10 doesn&#180;t admit to be a InternetExplorer.

What i&#180;ve found and tried so far:

    if(navigator.appVersion.indexOf(&quot;MSIE&quot;)!=-1){
    alert(&quot;You use IE. That&#180;s no good.&quot;);
    }

or

    if ( $.browser.msie ) {
    alert( $.browser.version );
    }

and

[http://msdn.microsoft.com/en-us/library/ie/ms537509%28v=vs.85%29.aspx][1]

I would use any solution if it is in javascript, jquery or php if there is one.



  [1]: http://msdn.microsoft.com/en-us/library/ie/ms537509%28v=vs.85%29.aspx

Detect if any kind of IE (MSIE)

I&#39;m trying to have dynamic select list populate itself, from a single selection to start:

    &lt;select id=&quot;activitySelector&quot;&gt;
          &lt;option value=&quot;addNew&quot;&gt;Add New Item&lt;/option&gt;
    &lt;/select&gt;

and then JavaScript code we have: 

    addEventListener(&quot;select&quot;, addActivityItem, false); 
The problem is that various events don&#39;t fire when you have one item: not &quot;change&quot; because, the text is no different when you select that item; not &quot;select&quot; (as I have here), for a roughly similar reason, because I&#39;m not really selecting anything because there&#39;s only one item. What is the event that should be fired here? It seems silly to list a blank item in my option list to fire the event, so I hope there is another solution. Or is that the best solution?

addEventListener, &quot;change&quot; and option selection

I&#39;m trying to allow CORS in node.js but the problem is that I can&#39;t set `*` to `Access-Control-Allow-Origin` if `Access-Control-Allow-Credentials` is set.

Also the specification said I can&#39;t do an array or comma separated value for `Access-Control-Allow-Origin` and the suggested method would be to do something similar to this https://stackoverflow.com/questions/1653308/access-control-allow-origin-multiple-origin-domains

But I can&#39;t seem to do this way in node.js

    [&quot;http://example.com:9001&quot;, &quot;http://example.com:5001&quot;].map(domain =&gt; {
      res.setHeader(&quot;Access-Control-Allow-Origin&quot;, domain);
    });
    res.header(&quot;Access-Control-Allow-Credentials&quot;, true);

The problem here is that it&#39;s bein override by the last value in the array, so the header will be set to       `res.setHeader(&quot;Access-Control-Allow-Origin&quot;, &quot;http://example.com:5001&quot;);`


Error from the client browser:

&gt; XMLHttpRequest cannot load http://example.com:9090/api/sync. The
&gt; &#39;Access-Control-Allow-Origin&#39; header has a value
&gt; &#39;http://example.com:5001&#39; that is not equal to the supplied origin.
&gt; Origin &#39;http://example.com:9001&#39; is therefore not allowed access.

Enable Access-Control-Allow-Origin for multiple domains in Node.js

This is my model definition:

    var Tag = sequelize.define(&#39;Tag&#39;, {
        name: Sequelize.STRING
    });
    
    var Event = sequelize.define(&#39;Event&#39;, {
        name: Sequelize.STRING,
    });
    
    Event.hasMany(Tag, {as: &#39;tags&#39;, through: &#39;event_tags&#39;, foreignKey: &#39;eventId&#39;});
    Tag.hasMany(Event, {as: &#39;events&#39;, through: &#39;event_tags&#39;, foreignKey: &#39;tagId&#39;});

In words this is: there are events and tags. Events are tagged with many tags.

I&#39;m trying to run this query:

    Event
    .findAndCountAll({
        include: [{model: Tag, as: &#39;tags&#39;}],
        where: {&#39;tags.id&#39;: {in: [1,2,3,4]}},
        order: order,
        limit: pageSize,
        offset: pageSize * (page - 1),
    })
    .success(function(result) {
    
        ...
    });

But I&#39;m getting this error:

       \node_modules\sequelize\lib\dialects\abstract\query-generator.js:1134
              var logicResult = Utils.getWhereLogic(logic, hash[key][logic]);
                                                                    ^
       TypeError: Cannot read property &#39;in&#39; of undefined

What am I doing wrong?

I&#39;ve used before the &quot;in&quot; expression, for example here:

     Tag
     .find({
          where: {id: {in: [1,2,3,4]}}
     }).success(...)

And it worked just fine.&lt;br&gt;

I&#39;ve never used the in expression with a sub-array though, as in this case. So I don&#39;t know if thats the correct way to do it.

Sequelize error when using &quot;where&quot; and &quot;in&quot; on a subarray

I am looking for a command that will list the names of global modules that I have `npm link`&#39;d to local copies, also listing the local path.

In fact, a list of **all** globally installed modules would be even better, with the `npm link`&#39;d ones **flagged** somehow.


How to list all the Node.js modules I have linked with npm

I have a file that is generated by `npm install` command (using `preinstall` task). I don&#39;t want to add it in the git repository, nor in the NPM project.

Supposing the file name is `foo.json`, I added it in `.gitignore` file as `foo.json`.

Is this enough to avoid uploading it on NPM registry?

I know I can add `.npmignore` file that will surely ignore the file, but I won&#39;t add it if `.gitignore` already does this.

Does NPM ignore files listed in .gitignore?

On my windows pc I have nodejs installed. I would like to determine whether it is 64 bit or 32 bit. How can one determine that? I executed 

    node --help

but that does not seem to have any option to give me the desired information.


how to determine whether I have 64bit or 32 bit node executable installed?

I have an Ubuntu 14.04 system, on which I want to install OpenCV and use it with Python 2.x.

I installed OpenCV using the instructions here:
[https://help.ubuntu.com/community/OpenCV][1]

The install seemed to run properly, no errors, the script ended with output 

    OpenCV 2.4.9 ready to be used

When I try to run the sample Python script, I get the following:

    $ python opencv.py
    Traceback (most recent call last):
      File &quot;opencv.py&quot;, line 1, in &lt;module&gt;
        from cv2.cv import *
    ImportError: No module named cv2.cv

I suspect I know why, I just don&#39;t know how to fix it. OpenCV installed to the current directory I was in when I ran the install script, it&#39;s a subdirectory of my home folder. 

Others who get this import error after install seem to be having a path issue, and have luck adding this to their code:

    import sys
    sys.path.append(&#39;/usr/local/lib/python2.7/site-packages&#39;)

or updating their PYTHONPATH with that same directory. I tried adding that code, it doesn&#39;t make a difference. I don&#39;t see any files in the &quot;site-packages&quot; directory. Should I have done the install in that directory? I imagine the installation instructions would have spelled that out. I suspect that my problem has to do with Python not finding the OpenCV install, but I&#39;m not sure how to proceed.

Please help me get a usable install of OpenCV as simply as possible.

  [1]: https://help.ubuntu.com/community/OpenCV


Installing OpenCV for Python on Ubuntu, getting ImportError: No module named cv2.cv

I&#39;m on Ubuntu 14.04 and I&#39;ve been trying all possible methods to install Laravel to no avail. Error messages everything I try. I&#39;m now trying the first method in the quickstart documentation, that is, via Laravel Installer, but it says to &quot;Make sure to place the `~/.composer/vendor/bin` directory in your `PATH` so the Laravel executable is found when you run the Laravel command in your terminal.&quot; so my question is, how do I do that? This may be a simple question but I&#39;m really frustrated and would appreciate any help.

How to place the ~/.composer/vendor/bin directory in your PATH?

I&#39;m using an amazon Ubuntu EC2 instance which is only has a command line interface. I want to setup UI for that server to access using remote desktop tools. Is there any way to apply GUI to the EC2 instance?

How To Set Up GUI On Amazon EC2 Ubuntu server

I am using the default config while adding the specific directory with nginx installed on my ubuntu 12.04 machine. 

    server {
            #listen   80; ## listen for ipv4; this line is default and implied
            #listen   [::]:80 default ipv6only=on; ## listen for ipv6
    
            index index.html index.htm;
    
            # Make site accessible from http://localhost/
            server_name localhost;
    
            location / {
                    # First attempt to serve request as file, then
                    # as directory, then fall back to index.html
                    root /username/test/static;
                    try_files $uri $uri/ /index.html;
                    # Uncomment to enable naxsi on this location
                    # include /etc/nginx/naxsi.rules
            }
    ...
    
    ...
    }

I just want a simple static nginx server to serve files out of that directory. However, checking the `error.log` I see

    2014/09/10 16:55:16 [crit] 10808#0: *2 stat() &quot;/username/test/static/index.html&quot; failed (13: Permission denied), client:, server: localhost, request: &quot;GET /favicon.ico HTTP/1.1&quot;, host: &quot;domain&quot;
    2014/09/10 16:55:16 [error] 10808#0: *2 rewrite or internal redirection cycle while internally redirecting to &quot;/index.html

I&#39;ve already done `chown -R www-data:www-data` on `/username/test/static`, I&#39;ve set them to `chmod 755`. I don&#39;t know what else needs to be set.

Nginx: stat() failed (13: permission denied)

Have been using Docker successfully for a few weeks but today when I was following a set of instructions which suggested adding the following two lines to the docker configuration file at `/etc/init/docker.conf`:

    limit memlock unlimited unlimited
    limit nofile 262144

It then suggested restarting Docker with `sudo /etc/init.d/docker restart`. When I did this under Ubuntu 14.04 it reported back that:

&gt; * Docker is managed via upstart, try using service docker restart

I tried `sudo service docker restart` to which it reported:

&gt; stop: Unknown job: docker
&gt;
&gt; start: Unknown job: docker

Now I&#39;m stuck with the docker daemon not running! I tried rebooting but it&#39;s still not running and when run something as simple as `sudo docker version` I get:

    Client version: 1.2.0
    Client API version: 1.14
    Go version (client): go1.3.1
    Git commit (client): fa7b24f
    OS/Arch (client): linux/amd64
    2014/10/01 09:57:45 Get http:///var/run/docker.sock/v1.14/version: dial unix /var/run/docker.sock: no such file or directory

To troubleshoot I tried starting the docker daemon on the commandline with:

    sudo docker -d

And in another terminal window I am now able to run Docker normally. That&#39;s great but HOW do I get it to startup normally again? Also I notice that I have TWO docker config files:

    /etc/init/docker.conf
    /etc/init/docker.io.conf

They look like DUPs. Are they redundant? Which one should I be looking at? Do I need both?

I also noticed that this duplicity shows up when I run `sudo service --status-all |grep docker` I get both `docker` and `docker.io` as listed services. Grown.


Starting Docker as Daemon on Ubuntu

I was attempting to upgrade `phonegap` via `npm` when I started running into trouble. Long story short, there are two `node_modules` directories on my computer.

    /usr/local/lib/node_modules
    /usr/local/share/npm/lib/node_modules

When I run `npm upgrade -g phonegap`, it appears that `npm` updates the copy of the package that resides in `/usr/local/lib/node_modules`. However, if I `which phonegap` I find that the symlink points to the older installation at `/usr/local/share/npm/lib/node_modules`.

Also, when I attempt to install a stand alone package such as `express`, the files are installed in the `/usr/local/lib/node_modules` directory, &lt;strike&gt;but no symlink to the executable is created in anywhere in my `$PATH`.&lt;/strike&gt;

Two questions:

 - Which is the proper directory for node modules on Mac OS X?
 - &lt;strike&gt;How can I configure `npm` to link executables in my `$PATH` when it installs software?&lt;/strike&gt;

Bonus points: Does the method of installing `node` affect the configuration? There are a [lot of options][1].

&lt;hr&gt;

**EDIT**: I figured out that symlinks were being created in my `/usr/local/bin`, but my `.bash_profile` was setup with `/usr/local/share/npm/bin` ahead of `/usr/local/bin` in my `$PATH`. I vaguely remember adding that path to my profile at some point, but I&#39;m not sure why.

So the question now becomes: how did I end up with two different `node_modules` directories on my computer and why would I want to have my `node_modules` in the `share/npm/lib` subdirectory instead of right in `/usr/local/lib`? 

  [1]: https://gist.github.com/isaacs/579814

Where should my npm modules be installed on Mac OS X?

I installed gulp(globally) and it looks like it worked because it ran this code:

    ├── tildify@0.2.0
    ├── interpret@0.3.5
    ├── pretty-hrtime@0.2.1
    ├── deprecated@0.0.1
    ├── archy@0.0.2
    ├── minimist@0.2.0
    ├── semver@2.3.2
    ├── orchestrator@0.3.7 (stream-consume@0.1.0, sequencify@0.0.7, end-of-stream@0.1.5)
    ├── chalk@0.5.1 (escape-string-regexp@1.0.1, ansi-styles@1.1.0, supports-color@0.2.0, strip-ansi@0.3.0, has-ansi@0.1.0)
    ├── gulp-util@2.2.20 (lodash._reinterpolate@2.4.1, dateformat@1.0.8-1.2.3, vinyl@0.2.3, through2@0.5.1, multipipe@0.1.1, lodash.template@2.4.1)
    ├── liftoff@0.12.0 (extend@1.2.1, minimist@0.1.0, resolve@0.7.4, findup-sync@0.1.3)
    └── vinyl-fs@0.3.5 (graceful-fs@3.0.2, lodash@2.4.1, mkdirp@0.5.0, strip-bom@0.3.1, vinyl@0.2.3, through2@0.5.1, glob-watcher@0.0.6, glob-stream@3.1.14)

But when I type `gulp` it says `-bash: gulp: command not found`

Any idea what&#39;s going on?


Gulp command not found after install

How to set some environment variables from within `package.json` to be used with `npm start` like commands?


Here&#39;s what I currently have in my `package.json`:

&lt;!-- language: lang-json --&gt;

    {
      ...
      &quot;scripts&quot;: {
        &quot;help&quot;: &quot;tagove help&quot;,
        &quot;start&quot;: &quot;tagove start&quot;
      }
      ...
    }

I want to set environment variables (like `NODE_ENV`) in the start script while still being able to start the app with just one command, `npm start`.

How to set environment variables from within package.json?

I install the CLion on a Ubuntu 14.04. I build my first project with help CMakeLists.txt:

Source file:

    #include &lt;iostream&gt;
    using namespace std;
    
    int main() {
      cout &lt;&lt; &quot;Hello, World!&quot; &lt;&lt; endl;
      return 0;
    }

CMakeLists.txt:

    cmake_minimum_required(VERSION 2.8.4)
    project(sh)
    
    set(SOURCE_FILES main.cpp)
    add_executable(sh ${SOURCE_FILES})

My source file is located in a **/home/user/Desktop/sh**. But after build, I don&#39;t see any executable file in this folder. Where is it? 

Where does CLion store executable files?

I was just adding tmux plugins to my .tmux.conf file to find out that one of the plugins (tmux-copycat I think) requires tmux 1.9.  When I start tmux I get the message `Error: Tmux version unsupported.  Please install tmux version 1.9 or greater!&quot;.  

So, what is the best way to upgrade tmux 1.8 to 1.9 on Ubuntu 14.04?  

Ugrade tmux from 1.8 to 1.9 on Ubuntu 14.04

I dont know how to install the latest Ruby on Ubuntu. 

First I installed the default Ruby 1.9.3, using

    sudo apt-get install ruby

Then I tried to install the 2.0 version using

    sudo apt-get install ruby2.0

My version of Ruby is still &quot;ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux])&quot;

What should I do? 

How to install Ruby 2.1.4 on Ubuntu 14.04

I installed Ubuntu 14.04 image on docker. After that, when I try to install packages inside the ubuntu image, I&#39;m getting unable to locate package error: 

    apt-get install curl

    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    E: Unable to locate package curl

How to fix this error?

Cannot install packages inside docker Ubuntu image

Given the option between using GPG and OpenSSL for local encryption before pushing archives to an off-site backup location, what are the benefits and drawbacks of each solution?

Background:
I currently manage a server infrastructure based on Ubuntu 14.04.1 with all current patches applied as they become available.

All of these systems are headless, automatically built using vetted preseeds and automation tools, and run in virtual machines via KVM on uniform Intel-based hardware.

We have a preference for Ruby, but a stronger preference for &quot;doing things correctly&quot;. Because of both, we&#39;ve chosen the &quot;backup&quot; gem as the means to create encrypted archives of data we want preserved, since it will create the same encrypted archives for a developer using Vagrant that it would in production, regardless of the mechanism by which it&#39;s transmitted. 

All software and configuration is managed via Puppet, so neither decision will have any impact on &quot;user experience&quot; or convenience. Either option will create relevant scripts to manage, verify, or restore from any backups created. 

Given that, does either encryption option offer any advantage against the other when used for this purpose?

Content Type	Original Author	Original Content on Stackoverflow
Question	rob	View Question on Stackoverflow
Solution 1 - Javascript	rob	View Answer on Stackoverflow

Where do global npm packages get installed on Ubuntu

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Express js form data

How to check if a radiobutton is checked in a radiogroup in Android?

Attributions