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From "Julien Blatecky (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAP5-2077) ElementWrapper#onevent jQuery implementation can return a wrong ElementWrapper
Date Tue, 05 Mar 2013 15:01:20 GMT
Julien Blatecky created TAP5-2077:
-------------------------------------

             Summary: ElementWrapper#onevent jQuery implementation can return a wrong ElementWrapper
                 Key: TAP5-2077
                 URL: https://issues.apache.org/jira/browse/TAP5-2077
             Project: Tapestry 5
          Issue Type: Bug
          Components: tapestry-core
    Affects Versions: 5.4
            Reporter: Julien Blatecky
         Attachments: elementwrapper.onevent.patch

Considers we bind an event on an element (<a> for example) and this element contains
some other element (<span> for instance).
The event that will be triggered returns an ElementWrapper wrapping the span element if we
clicked on span, instead of returning a wrapped element of the <a> element.

Consequently, in the case of a a[data-update-zone] containing some span or img elements, clicking
on one of these elements raises a javascript error : "Attempt to wrap a null DOM element"
when handling the callback.

Indeed, in the wrapped callback (line 95 in the coffeescript jquery dom) the ElementWrapper
is instantiated with the "event.target" returned by jquery, which is not the element on which
we defined the event, but the deeper element on which the event occurs. jQuery.com says "The
target property can be the element that registered for the event or a descendant of it.",
whereas "this" will be "the current DOM element within the event bubbling phase." just like
"event.currentTarget".

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