<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.js"></script>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
  <script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/js/bootstrap-multiselect.js"></script>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/css/bootstrap-multiselect.css">


<div class="">
	<strong>Select Language:</strong>
    <select id="multiple-checkboxes" multiple="multiple">
        <option value="php">PHP</option>
        <option value="javascript">JavaScript</option>
        <option value="java">Java</option>
        <option value="sql">SQL</option>
        <option value="jquery">Jquery</option>
        <option value=".net">.Net</option>
    </select>
</div>
    $(document).ready(function() {
        $('#multiple-checkboxes').multiselect({
          includeSelectAllOption: true,
        });
    });

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.