[javascript] Bootstrap Collapse not Collapsing

I am trying to create a collapsable component using Bootstrap. My code is this

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">_x000D_
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>_x000D_
<div class="panel-group" id="accordion">_x000D_
  <div class="panel panel-default">_x000D_
    <div class="panel-heading">_x000D_
      <h4 class="panel-title">_x000D_
        <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne">_x000D_
      Collapsible Group Item #1_x000D_
    <div id="collapseOne" class="panel-collapse collapse in">_x000D_
      <div class="panel-body">_x000D_
        Anim pariatur cliche reprehenderit_x000D_

The "Collapsible Group Item #1" when clicked should collapse the items in class "panel-body" but it doesn't there is no effect of click. I copied this code directly from Bootstrap documentation still it does not work. Can anyone figure out what is the problem?

This question is related to javascript css twitter-bootstrap collapse

The answer is

Add jQuery and make sure only one link for jQuery cause more than one doesn't work...

Maybe your mobile view port is not set. Add following meta tag inside <head></head> to allow menu to work on mobiles.

<meta name=viewport content="width=device-width, initial-scale=1">

You need jQuery see bootstrap's basic template

I had this problem and the problem was bootstrap.js wasn't load in Yii2 framework.First check is jquery loaded in inspect and then check bootstrap.js is loaded?If you used any tooltip Popper.js is needed before bootsrap.js.

bootstrap.js is using jquery library so you need to add jquery library before bootstrap js.

so please add it jquery library like

Note : Please maintain order of js file. html page use top to bottom approach for compilation

    <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
    <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
    <script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>

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