$(function () {
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");
}
}
$(".custom-select").click(function () {
open($(this).find('select'));
});
});
Your select tag hasn't ended either </select>.
Fiddle
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