Question

176

How do I stop a window.setInterval in javascript?

rated 0 times [ 179] [ 3] / answers: 1 / hits: 65397 / 13 Years ago, fri, september 2, 2011, 12:00:00

I have a javascript function that is called every 2000ms. I want to stop this so I can have the user do other things on the page without it being called again. Is this possible? Here is the function that gets called every 2000ms:

window.setInterval(function getScreen (sid) {

        if (window.XMLHttpRequest)

        {// code for IE7+, Firefox, Chrome, Opera, Safari

          xmlhttp=new XMLHttpRequest();

        }

        else

        {// code for IE6, IE5

          xmlhttp=new ActiveXObject(Microsoft.XMLHTTP);

        }

        xmlhttp.onreadystatechange=function()

        {

        if (xmlhttp.readyState==4 && xmlhttp.status==200)

          {

            document.getElementById(refresh).innerHTML=xmlhttp.responseText;

          }

        }

        xmlhttp.open(POST,getScreen.php?sid=+<?php echo $sid; ?>,true);

        xmlhttp.send();

    },2000);

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judydestiniem

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3 Years ago

answered 13 Years ago jonrened · Accepted Answer

There's no built-in pause function, but you can stop it, and then start a new interval with the same function.

First, you need to capture the id returned by the call to setInterval:

let intervalId = window.setInterval(...);

Then when you want to stop it, call

 window.clearInterval(intervalId);

In your case I'd suggest defining setScreen by itself, and not inside of the call to setInterval. This way you can just use intervalId = window.setInterval(setScreen, 2000) when you want to resume it.