How to call a javascript function in runtime in IE8

Question

I have a click event which works fine in all other browsers except IE8

I tried

document.getElementById('xxx').click  -- returns function called
document.getElementById('xxx').click() -- object not supported 
document.querySelectorAll('xxx').click  -- not supported
$("#xx").trigger("click")  -- not supported
$(".xx").trigger("click") --not supported

In html i have <div id="xxx" click="functionname('param1','param2')"></div>

Now the document.getElementById('xxx').click returns the function returned

ie functionname(param1,param2)

How can call this function at this time? like i want to execute this function

Answer 1

Add function bracket. Otherwise you will get function definition

document.getElementById('xxx').click()

or

var evt = document.createEvent("MouseEvents");
evt.initMouseEvent("click", true, true, window, 1, 0, 0, 0, 0,
    false, false, false, false, 0, null);

var cb = document.getElementById(id);
cb.dispatchEvent(evt);