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Thread: e.srcElement and e.target return the wrong element

  1. #1
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    e.srcElement and e.target return the wrong element

    In this case the e.srcElement/e.target should return 'home' or 'about', but instead one of the two layers inside 'home' or 'about' will be returned. And these dont even have a onmouseover attribute!

    The following page is specially made to make it easy to fix the bug if you know how :-)
    http://floris.ruwhof.net/bug-test.htm

  2. #2
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    At a first glance I see a critical error: you have several elements with the same id, which is HTML/CSS/JavaScript illegal. A certain id must be unique on document/session.

  3. #3
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    The only duplicate i can find is: id="menu-item-text" and i've just did that one for debugging purpose only.

    but thnx for taking the time

  4. #4
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    It is not a bug. It looks only that you have not understood the difference between detecting/capturing an event and attaching an event.
    Code:
    function(e){
    var eventType = e.type;
    ...
    }
    This anonymous will not act as an inner function, it will simply capture the generic event on the whole element , so that the target will be in fact the element itself or any of it's child nodes, it depends on which of them supports the event at a certain moment. To understand better, take a look at a simple example, using the onclick event:
    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
    <html>
    <head>
    <title>Untitled Document</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta http-equiv="Content-Style-Type" content="text/css">
    <meta http-equiv="Content-Script-Type" content="text/javascript">
    <style type="text/css">
    #container{
    width:400px;
    hei:400px;
    background:#ccc;
    }
    #firstID, #secondID{
    border:1px solid #ff0000;
    }
    </style>
    <script type="text/javascript">
    function check(e){
    var target = (e && e.target) || (event && event.srcElement);
    alert(target.id)
    }
    </script>
    </head>
    <body>
    <div id="container" onclick="check(event)">
    <div id="firstID">click here the first div</div>
    <div id="secondID">click here the second div</div>
    <br>
    click here the container
    </div>
    </body>
    </html>
    That not means I have attached an onclick event to all the child nodes of the container node. I have simply captured the event onclick itself, and whenever that event is fired inside the container div, it will show me which is the target upon I have performed the click. The target might be the container itself or any of the child nodes divs, depending on where I do the click.
    Last edited by Kor; 08-16-2010 at 06:01 AM.

  5. #5
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    Okay thanks, that really explains a lot. Is there any other way to still get what I want? And that is capturing the executed code inside of onmouseover/onmouseout.

    I really really really hope this is still possible.

  6. #6
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    Quote Originally Posted by Ruwetuin View Post
    Is there any other way to still get what I want?
    There might be, but only if you explain us more clear what in fact you want. I confess I did not understand too much of the scope of your code. Which is your real and final aim?

  7. #7
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    My real aim is to record all executed javascript code on a page, to replay it on a later time. Pretty crazy I know.

    It actually worked quitte well with a few pages, until I (you) just found out that it's an unreliable method getting the executed code with srcElement/target of an event.

  8. #8
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    Quote Originally Posted by Ruwetuin View Post
    My real aim is to record all executed javascript code on a page, to replay it on a later time. Pretty crazy I know.
    Do you mean you want to record: which functions were triggered, from where, using which event, and which parameters were passed, if any?

  9. #9
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    yes

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