Simple Dual List Box With A Search For Bootstrap 4

Duallistbox is a simple, clean and filterable (multi-select) dual list box built with JavaScript and the latest Bootstrap 4 framework.

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How to make use of it:

1. To use this plugin, the latest Bootstrap 4 stylesheet is loaded in the document.

<!-- Required -->
<link rel="stylesheet" href="/path/to/cdn/bootstrap.min.css" />
<!-- Optional -->
<script src="/path/to/cdn/jquery.slim.min.js"></script>
<script src="/path/to/cdn/bootstrap.min.js"></script>

2. Load the JavaScript and Stylesheet plug-ins for the dual list box into the document.

<link rel="stylesheet" href="duallistbox.min.css" />
<script src="duallistbox.min.js"></script>

3. Convert a normal multiple selections to a dual list box component using the duallistbox function.

<select name="countries[]" id="test" multiple onchange="getValues()">
  <option value="Albania">Albania</option>
  <option value="Afghanistan">Afghanistan</option>
  <option value="Algeria">Algeria</option>
  <option value="Andorra">Andorra</option>
  <option value="Angola">Angola</option>
  <option value="Antigua and Barbuda">Antigua and Barbuda</option>
  <option value="Argentina">Argentina</option>
  <option value="Armenia">Armenia</option>
  <option value="Australia">Australia</option>
  <option value="Austria">Austria</option>
  <option value="Azerbaijan">Azerbaijan</option>
</select>

<script src="duallistbox.min.js"></script>

4. Get the selected options for further use.

function getValues() {
  document.getElementById('outputContainer').innerText = [...document.getElementById('test').selectedOptions].map(o => o.textContent).join(', ')
};
getValues();

Filterable Dual List Box With Move/Remove All Buttons, duallistbox Plugin/Github