jQuery scroll() detect when user stops scrolling

Question

Ok with this..

$(window).scroll(function()
{
    $(\'.slides_layover\').removeClass(\'showing_layover\');
    $(\'#slides_effect\').show();
});

Answer 1

For those Who Still Need This Here Is The Solution

  $(function(){
      var t;
      document.addEventListener('scroll',function(e){
          clearTimeout(t);
          checkScroll();
      });
      
      function checkScroll(){
          t = setTimeout(function(){
             alert('Done Scrolling');
          },500); /* You can increase or reduse timer */
      }
  });

Answer 2

Rob W suggected I check out another post here on stack that was essentially a similar post to my original one. Which reading through that I found a link to a site:

http://james.padolsey.com/javascript/special-scroll-events-for-jquery/

This actually ended up helping solve my problem very nicely after a little tweaking for my own needs, but over all helped get a lot of the guff out of the way and saved me about 4 hours of figuring it out on my own.

Seeing as this post seems to have some merit, I figured I would come back and provide the code found originally on the link mentioned, just in case the author ever decided to go a different direction with the site and ended up taking down the link.

(function(){

    var special = jQuery.event.special,
        uid1 = 'D' + (+new Date()),
        uid2 = 'D' + (+new Date() + 1);

    special.scrollstart = {
        setup: function() {

            var timer,
                handler =  function(evt) {

                    var _self = this,
                        _args = arguments;

                    if (timer) {
                        clearTimeout(timer);
                    } else {
                        evt.type = 'scrollstart';
                        jQuery.event.handle.apply(_self, _args);
                    }

                    timer = setTimeout( function(){
                        timer = null;
                    }, special.scrollstop.latency);

                };

            jQuery(this).bind('scroll', handler).data(uid1, handler);

        },
        teardown: function(){
            jQuery(this).unbind( 'scroll', jQuery(this).data(uid1) );
        }
    };

    special.scrollstop = {
        latency: 300,
        setup: function() {

            var timer,
                    handler = function(evt) {

                    var _self = this,
                        _args = arguments;

                    if (timer) {
                        clearTimeout(timer);
                    }

                    timer = setTimeout( function(){

                        timer = null;
                        evt.type = 'scrollstop';
                        jQuery.event.handle.apply(_self, _args);

                    }, special.scrollstop.latency);

                };

            jQuery(this).bind('scroll', handler).data(uid2, handler);

        },
        teardown: function() {
            jQuery(this).unbind( 'scroll', jQuery(this).data(uid2) );
        }
    };

})();

Answer 3

This detects the scroll stop after 1 milisecond (or change it) using a global timer:

var scrollTimer;

$(window).on("scroll",function(){
    clearTimeout(scrollTimer);
    //Do  what you want whilst scrolling
    scrollTimer=setTimeout(function(){afterScroll()},1);
})

function afterScroll(){
    //I catched scroll stop.
}

Answer 4

I agreed with some of the comments above that listening for a timeout wasn't accurate enough as that will trigger when you stop moving the scroll bar for long enough instead of when you stop scrolling. I think a better solution is to listen for the user letting go of the mouse (mouseup) as soon as they start scrolling:

$(window).scroll(function(){
    $('#scrollMsg').html('SCROLLING!');
    var stopListener = $(window).mouseup(function(){ // listen to mouse up
        $('#scrollMsg').html('STOPPED SCROLLING!');
        stopListner(); // Stop listening to mouse up after heard for the first time 
    });
});

and an example of it working can be seen in this JSFiddle

Answer 5

Using jQuery throttle / debounce

jQuery debounce is a nice one for problems like this. jsFidlle

$(window).scroll($.debounce( 250, true, function(){
    $('#scrollMsg').html('SCROLLING!');
}));
$(window).scroll($.debounce( 250, function(){
    $('#scrollMsg').html('DONE!');
}));

The second parameter is the "at_begin" flag. Here I've shown how to execute code both at "scroll start" and "scroll finish".

Using Lodash

As suggested by Barry P, jsFiddle, underscore or lodash also have a debounce, each with slightly different apis.

$(window).scroll(_.debounce(function(){
    $('#scrollMsg').html('SCROLLING!');
}, 150, { 'leading': true, 'trailing': false }));

$(window).scroll(_.debounce(function(){
    $('#scrollMsg').html('STOPPED!');
}, 150));

Answer 6

Ok this is something that I've used before. Basically you look a hold a ref to the last scrollTop(). Once your timeout clears, you check the current scrollTop() and if they are the same, you are done scrolling.

$(window).scroll((e) ->
  clearTimeout(scrollTimer)
  $('header').addClass('hidden')

  scrollTimer = setTimeout((() ->
    if $(this).scrollTop() is currentScrollTop
      $('header').removeClass('hidden') 
  ), animationDuration)

  currentScrollTop = $(this).scrollTop()
)