Open Select using Javascript/jQuery?

I know this is pretty old and answered, but this worked for me in Safari and iOS UIWebView - I have it hidden, but want it to show and open when a different button is clicked.

$('#select-id').show().focus().click();

Instead of using click, you could use the mousedown handler to capture the mousedown event. mousedown fires before click, so you could call stopPropogation to break the event queue.

Try this:

var myDropDown=$("#myDropDown");
var length = $('#myDropDown> option').length;
//open dropdown
myDropDown.attr('size',length);

and this to close:

//close dropdown
myDropDown.attr('size',0);

Try this:

dropDown = function (elementId) {
    var dropdown = document.getElementById(elementId);
    try {
        showDropdown(dropdown);
    } catch(e) {

    }
    return false;
};

showDropdown = function (element) {
    var event;
    event = document.createEvent('MouseEvents');
    event.initMouseEvent('mousedown', true, true, window);
    element.dispatchEvent(event);
};

Then call the function:

dropDown('elementId');