javascript - How do I know when I've stopped scrolling?

Question

How do I know when I've stopped scrolling using Javascript?

Answer 1

You can add an event handler for the scroll event and start a timeout. Something like:

var timer = null;
window.addEventListener('scroll', function() {
    if(timer !== null) {
        clearTimeout(timer);        
    }
    timer = setTimeout(function() {
          // do something
    }, 150);
}, false);

This will start a timeout and wait 150ms. If a new scroll event occurred in the meantime, the timer is aborted and a new one is created. If not, the function will be executed. You probably have to adjust the timing.

Also note that IE uses a different way to attach event listeners, this should give a good introduction: quirksmode - Advanced event registration models