Event listener not properly detached for multipart AJAX requests
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Key: WICKET-4122
URL: https://issues.apache.org/jira/browse/WICKET-4122
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.5.0
Environment: HtmlUnit
Reporter: Andreas Kappler
Priority: Minor
We are using HtmlUnit for functional testing of a wicket application. We have
several issues with it but one of the more critical problems arises whenever a
multipart form is submitted via AJAX. Internally wicket apparently uses an
iframe to submit the request and listens for the "load" event of this iframe to
detect the success of the request.
The problem is that HtmlUnit fires the "load" event twice. I am not sure if
this is a HtmlUnit problem (I do suspect that it is), but when looking at the
wicket code I am wondering about these lines of javascript code:
Here in wicket-ajax.js:1215 the event is attached
{code:javascript}
Wicket.Event.add(iframe, "load", this.handleMultipartComplete.bind(this));
{code}
And later in wicket-ajax.js:1246 it is detached
{code:javascript}
// remove the event
if (iframe.detachEvent)
iframe.detachEvent("onload", this.handleMultipartComplete);
else
iframe.removeEventListener("load", this.handleMultipartComplete, false);
{code}
But because the bind function returns a new object this should never work,
right? I have attached a patch that fixes the problem in my environment, please
take a look at it if this makes sense.
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