Question

I’ve been trying to bind scroll event to an element on the page, and on scroll load more content like Twitter or Facebook do.

HTML

<div id="main-content">
    <ul class="event-list big row" id="event-list">
    ...
    </ul>
</div>

CSS

#main-content {
    width: 984px;
    overflow: visible;
    margin: 0 auto;
    color: #101010;
    width: 974px;
    padding: 10px 0 7px 0;
}
#main-content .event-list.big {
   width: 1080px;
   padding: 0 0 20px 0;
}

JS code

$('#event-list').scroll(function() {
    var curScroll = $(this)[0].scrollTop,
        maxScroll = $(this)[0].scrollHeight - $(this).height();

    console.log(curScroll, ' :: ', maxScroll);

    if ((curScroll >= maxScroll - 200) && !loading) {
        loading = true;

        $(this)[0].scrollTop = curScroll;

        $('.loading').fadeIn('fast');

        if (page <= $('.page').length) {
            loadMore();
        }
    }
});

The scroll event is not triggered when I scroll its even doesn’t print out curScroll and maxScroll.

What may cause the problem at all, maybe CSS styles are wrong or my js code wrong?

Answer 1

Here’s a working example of what I believe you want with the scrolling event triggering. Use the div as a scrollable region by setting ‘overflow: scroll’. Note: you will only get the scroll event if the list is long enough on the initial load. (See the height property on main-content. I’ll leave the ajax loading up to you. 🙂

CSS

 #main-content {
    width: 984px;
    overflow: scroll;
    margin: 0 auto;
    color: #101010;
    width: 974px;
    height: 100px;
    padding: 10px 0 7px 0;
}
#main-content .event-list.big {
   width: 1080px;
   padding: 0 0 20px 0;
}

Script

$(document).ready(function() {
            $('#main-content').scroll(function() {
              var curScroll = $(this)[0].scrollTop,
                  maxScroll = $(this)[0].scrollHeight - $(this).height();

              console.log(curScroll, ' :: ', maxScroll);

              if ((curScroll >= maxScroll - 200) && !loading) {
                  loading = true;

                  $(this)[0].scrollTop = curScroll;

                  $('.loading').fadeIn('fast');

                  if (page <= $('.page').length) {
                      loadMore();
                  }
              }
            });
        });

HTML

<div id="main-content">
    <ul class="eventlist big row" id="event-list">
      <li>1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
      <li>6</li>
      <li>7</li>
      <li>8</li>
      <li>9</li>
      <li>0</li>
      <li>1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
    </ul>
</div>