An issue with javascript syntax comprehension

Question

Could someone please explain to me this statement in Javascript :

var keyCode = window.event ? window.event.keyCode : e.which;

Any help greatly appreciated !

Answer 1

This is the ternary conditional operator .

Here it is used to get the window.event.keyCode value if window.event exists, e.which in other cases.

Answer 2

Some browsers don't recognise window.event . This is called ternary operator. It's a way to be sure the code works in different browsers and a short way to write:

If window.event is not undefined then keyCode = window.event.keyCode , otherwise keycode = e.which

Answer 3

var Keycode = window.event? window.event.keyCode : e.which


var Keycode;
if(window.event)
Keycode = window.event.keyCode;
else
Keycode  = e.which;

Answer 4

It means

var keyCode;
if(window.event){
  keyCode = window.event.keyCode;
} else {
  keyCode = e.which;
}

You should see Javascript grammar.