third_party/WebKit/LayoutTests/fast/events/fire-scroll-event-element.html

   1 <html>
   2 <script src="../../resources/js-test.js"></script>
   3 <body>
   4 <div id="container" style="overflow: auto; width: 500px; height: 500px">
   5   <div style="height: 5000px; width: 5000px;"></div>
   6 </div>
   7 <script>
   8 description('Checks that the scroll event fires on elements asychronously and only once.');
   9
  10 var eventCount = 0;
  11 var doneTimeout;
  12
  13 function scrollHandler(event)
  14 {
  15     eventCount++;
  16     if (eventCount == 1) {
  17         debug('Scroll event bubbles: ' + event.bubbles);
  18         var container = document.getElementById('container');
  19         var scrollX = container.scrollLeft;
  20         var scrollY = container.scrollTop;
  21         testPassed('Scroll position: (' + scrollX + ', ' + scrollY + ')');
  22         // Don't call notifyDone straight away, in case there's another scroll event coming.
  23         doneTimeout = setTimeout(finishJSTest, 100);
  24     } else {
  25         clearTimeout(doneTimeout);
  26         testFailed('Scroll handler was invoked ' + eventCount + ' times');
  27         finishJSTest();
  28     }
  29 }
  30
  31 onload = function()
  32 {
  33     var container = document.getElementById('container');
  34     container.addEventListener('scroll', scrollHandler, false);
  35     container.scrollTop = 100;
  36     if (eventCount > 0) {
  37       testFailed('Scroll event fired synchronously');
  38       finishJSTest();
  39     }
  40     container.scrollTop = 200;
  41 }
  42 var jsTestIsAsync = true;
  43 </script>
  44 </body>
  45 </html>