How to open the select input using jquery

This should work:

var element = $("select")[0], worked = false;
if (document.createEvent) { // all browsers
    var e = document.createEvent("MouseEvents");
    e.initMouseEvent("mousedown", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
    worked = element.dispatchEvent(e);
} else if (element.fireEvent) { // ie
    worked = element.fireEvent("onmousedown");
}
if (!worked) { // unknown browser / error
    alert("It didn't worked in your browser.");
}

Example

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