The code triggers js events of click and change sample application

Chrome, Firfox does not support fireEvent's methods
Instead, use the method dispatchEvent to give a compatible Code directly.

Click event

 
function simulateClick(el) { 
var evt; 
if (document.createEvent) { // DOM Level 2 standard 
evt = document.createEvent("MouseEvents"); 
evt.initMouseEvent("click", true, true, window, 
0, 0, 0, 0, 0, false, false, false, false, 0, null); 
el.dispatchEvent(evt); 
} else if (el.fireEvent) { // IE 
el.fireEvent('onclick'); 
} 
} 

Drag event

 
function simulateDrag(el) { 
var evt; 
if (document.createEvent) { // DOM Level 2 standard 
evt = document.createEvent("MouseEvent"); 
evt.initMouseEvent("dragstart", true, true, window, 
0, 0, 0, 0, 0, false, false, false, false, 0, null); 
el.dispatchEvent(evt); 
} else if (el.fireEvent) { // IE 
el.fireEvent('ondragstart'); 
} 
}