Programatically Expand Select menu

by Kaleb Hornsby

HTML

<select id="ts">
    <option value="1">1</option>
    <option value="2">Lorem ipsum dolor s.</option>
    <option value="3">3</option>
</select>
<input type="button" id="click" value="Click"/>

JavaScript

$(document).ready(function() {

    $('#click').click(function() {
        open($('#ts'));
    });

});

function open(elem) {
    if (document.createEvent) {
        var e = document.createEvent("MouseEvents");
        e.initMouseEvent("mousedown", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
        elem[0].dispatchEvent(e);
    } else if (element.fireEvent) {
        elem[0].fireEvent("onmousedown");
    }
}