Question

176

window.event alternative in Firefox

rated 0 times [ 179] [ 3] / answers: 1 / hits: 17049 / 10 Years ago, wed, april 2, 2014, 12:00:00

I see that window.event or event does not work in Firefox, so I need alternative for this. I don't want to set ANY HTML attributes, just Javascript.
I'm within this function and I want to get mouse coordinates from here:

document.onmouseover = function(){

    var mouseX = event.clientX;

    var mouseY = event.clientY;

}

Obviously this won't work in firefox, so I want to know how to do it.

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answered 10 Years ago loric · Accepted Answer

This is the typical approach that you'll find in examples everywhere.

document.onmouseover = function(event) {

    event = event || window.event;



    var mouseX = event.clientX;

    var mouseY = event.clientY;

}

The W3C standard way of retrieving the event object is via the first function parameter. Older IE didn't support that approach, so event will be undefined. The || operator lets us fetch the window.event object in that case.