jQuery Simple Example

HTML

<script src="//www.addressfinder.co.nz/assets/v2/widget.js"></script>

CSS

body {
    padding: 5px;
}

label {
    font-weight: bold;
}

input[type=text] {
    width: 20em
}

p {
    margin: 1em 0 0;
}

JavaScript

var $html = $('<div><select class="target"><option value="1">1</option><option value="2">2</option><option value="3">3</option></select></div>');
$html.find('.target').val('2');
$('body').html($html);