Open or expand dropdown with javascript

 

tiny code to open a dropdown by code

            window.openDropdown = function (str) {
                var dropdown = document.getElementById('myDropDown');
                var event;
                event = document.createEvent('MouseEvents');
                event.initMouseEvent('mousedown', true, true, window);
                dropdown.dispatchEvent(event);
            }

and then use this to fire the event

openDropdown(0);