By Sam Deering

How to Clear setInterval() without Knowing the ID

By Sam Deering

Declaring a setInterval() without keeping a reference to it (which is returned from the function call setInterval(), it returns an id number for the registered event).

Like so:

var interval = setInterval(function() {
}, 1000);

It you can see it assigns a random number as the id for the event. Then when we clear the interval it uses that id.


Simply by calling:


A Diirty Solution
Now this is not good coding practice (for a number of reasons) but if you really need to clear that interval we can simply do a loop to find the id of the event to stop all setInterval() events that are running. I’ve done a quick jsfiddle to show you.

for(i=0; i<100; i++)

I’m pretty sure this will also work for setTimeout() and clearTimeout();

  • ilan

    I solve it by creating a fake interval whose id number is apparently the highest one. This method is very important with working on userscripts.

    var fake=setInterval(“”);

    for(var i = 0 ; i < fake ; i++) {

  • Mike

    You cant use a local var to clear the timers ??? Can U ?? Dosent work on my end…

Get the latest in JavaScript, once a week, for free.