Check if a timeout has been cleared?

Question

I am wondering is there a way to tell if a timeout is still set

var t=setTimeout("alertMsg()",3000); 

I thought t would be like undefined when you clear it. But it seems to have some id that does not get cleared.

Answer 1

Not directly, but you can create a wrapper object to give that functionality. A rough implementation is like so:

function Timeout(fn, interval) {     var id = setTimeout(fn, interval);     this.cleared = false;     this.clear = function () {         this.cleared = true;         clearTimeout(id);     }; } 

Then you can do something like:

var t = new Timeout(function () {     alert('this is a test'); }, 5000); console.log(t.cleared); // false t.clear(); console.log(t.cleared); // true