[Webkit-unassigned] [Bug 10457] New: Disabling of default action in mouseup handler disables mousemove event

Thu Aug 17 04:45:26 PDT 2006

http://bugzilla.opendarwin.org/show_bug.cgi?id=10457

           Summary: Disabling of default action in mouseup handler disables
                    mousemove event
           Product: WebKit
           Version: 420+ (nightly)
          Platform: Macintosh PowerPC
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: mjuhos at kerio.com

Overview Description: 
Problem is caused by disabling of default browser action in "onmouseup"
handler. There are two ways how do that:
1) Set return value of "onmouseup" handler to "false" (see Test case)
2) Call method event.preventDefault() (see Test case modification)

Disabling of default action is affecting behavior of other events - but they
couldn't be affected (try test case in Firefox). So that after mouseup isn't
triggered "mousemove" event in this case.

Steps to Reproduce:
  1) Open test case in Safari (WebKit)
  2) Move mouse up and down over text
  3) Click on some text in testcase
  4) Move mouse up and down over text

Actual Results:
  When I moved mouse, items are not highlited.

Expected Results: 
  When I moved mouse, items will be highlited.

Build Date & Platform: 
  Build 2002-008-17 on Mac OS 10.4.7

Test case:
<html>
  <script>
    function highlight(item) {
     item.style.backgroundColor = (item.style.backgroundColor == "red") ? '' :
'red';
    }
    onmouseup = function() {
      return false;
    }
  </script>
  <body>
    <div onmouseover="highlight(this)" onmouseout="highlight(this)">Item1</div>
    <div onmouseover="highlight(this)" onmouseout="highlight(this)">Item2</div>
    <div onmouseover="highlight(this)" onmouseout="highlight(this)">Item3</div>
    <div onmouseover="highlight(this)" onmouseout="highlight(this)">Item4</div>
  </body>
</html>

Test case modification:
    onmouseup = function(event) {
      event.preventDefault();
    }

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