SO Question

http://stackoverflow.com/questions/7373058

by Kaleb Hornsby

HTML

<select id="sel">
    <option value="1">Cat</option>
    <option value="2">Dog</option>
    <option value="3">Fish</option>
</select>

JavaScript

var val = 3;    
document.querySelector('#sel [value="' + val + '"]').selected = true;