jQuery Simple Example

HTML

<script src="//www.addressfinder.co.nz/assets/v2/widget.js"></script>
<select class="myClass" data-val="true" id="sampleSelect" name="sampleSelect">
  <option value="">Select an option</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3" selected="selected">3</option>
</select>

JavaScript

$(function() {
	$('#sampleSelect').change(function () {
    var test = $('#sampleSelect').val();
    alert(test)
	});
});