Javascript- document/window has focus? [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

How 开发者_运维技巧do I find out which Javascript element has focus?

Is it possible to check in Javascript whether the current window has focus?

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No, not really. May be you could assign handlers to the focus/blur events of the window, setting a boolean to true or false and use that to determine if it has focus or not.

Something along this line:

window.hasfocus = false;

window.onfocus = function(){
   this.hasfocus = true;
}

window.onblur = function(){
   this.hasfocus = false;
}