select2 is not working

Question

My select2 is not working. It just shows up with multiple selectbox

<form action="">
<select class="js-example-basic-multiple" multiple="multiple">

<option value="AK">Alaska</option>
<option value="HI">Hawaii</option>

<option value="CA">California</option>
<option value="NV">Nevada</option>
<option value="OR">Oregon</option>
<option value="WA">Washington</option>

<option value="AZ">Arizona</option>
<option value="CO">Colorado</option>
<option value="ID">Idaho</option>
<option value="MT">Montana</option>
<option value="NE">Nebraska</option>
<option value="NM">New Mexico</option>
<option value="ND">North Dakota</option>
<option value="UT">Utah</option>
<option value="WY">Wyoming</option>

  </select>
</form>
<script type="text/javascript">
                $(".js-example-basic-multiple").select2();
</script>

Error in console: Uncaught TypeError: $(...).select2 is not a function at HTMLDocument.

JS FIDDLE:

https://jsfiddle.net/y6ogss94/

You have an error in the console: `TypeError: $(...).select2 is not a function` it seems select2 is not well imported. — AnthonyB, Dec 22 '16 at 06:54
@AnthonyB Uncaught TypeError: $(...).select2 is not a function at HTMLDocument. — A.R, Dec 22 '16 at 06:56
Check if sequence is correct (*jQuery and then Select2*) and jQuery is not loaded multiple times(*after Select2*) — Rajesh, Dec 22 '16 at 06:59

Mohit Bhardwaj · Accepted Answer · 2016-12-22T07:19:02.800

This runs fine if you have imported correctly - jQuery library, select2 js and select2 css.

Here I have imported jquery 2.0.0 and select2 css and js from their cdn and it works fine:

 $(".js-example-basic-multiple").select2();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>


<form action="">
<select class="js-example-basic-multiple" multiple="multiple">

<option value="AK">Alaska</option>
<option value="HI">Hawaii</option>

<option value="CA">California</option>
<option value="NV">Nevada</option>
<option value="OR">Oregon</option>
<option value="WA">Washington</option>

<option value="AZ">Arizona</option>
<option value="CO">Colorado</option>
<option value="ID">Idaho</option>
<option value="MT">Montana</option>
<option value="NE">Nebraska</option>
<option value="NM">New Mexico</option>
<option value="ND">North Dakota</option>
<option value="UT">Utah</option>
<option value="WY">Wyoming</option>

  </select>
</form>

Note: You need to execute your select2 initialisation code only after you have included both the js libraries and DOM has loaded, which is a general practice for most jQuery plugins, not only this. So, while using this code you should write this script after including jquery and select2 scripts:

<script>
$(document).ready(function(){
  $(".js-example-basic-multiple").select2();
});//document ready
</script>

You may want to use initialize select2 once DOM is loaded. So you can initialize it inside a _DOMContentLoaded_ event. The important is select2 be used after importing jquery and select2 scripts. — AnthonyB, Dec 22 '16 at 07:04
yeah, you're right @AnthonyB. Thanks. But I think the code snippet automatically puts all the script code inside something like "$(document).ready()" so it runs only after DOM has been loaded. I'm not sure though. — Mohit Bhardwaj, Dec 22 '16 at 07:06
The snippet does I think, but as people will copy/paste this code to fix their Select2 problem, it could be useful to use Select2 after importing scripts and perhaps in a `$(document).ready()` — AnthonyB, Dec 22 '16 at 07:15
yeah thanks @AnthonyB. Just added a note for this in the answer. — Mohit Bhardwaj, Dec 22 '16 at 07:19

select2 is not working

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