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From "Filip Maj (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-514) Do we need to monkey patch addEventListener()?
Date Wed, 02 May 2012 20:56:56 GMT

    [ https://issues.apache.org/jira/browse/CB-514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266896#comment-13266896
] 

Filip Maj commented on CB-514:
------------------------------

I've looked into this a little bit more, and been working on a [branch in my repo|https://github.com/filmaj/incubator-cordova-js/tree/axemonkeypatch].

I stumbled upon an issue, though. For example, in the battery API, we need to know when the
first handler to a {{window}} or {{document}} event gets added, and when the last handler
gets removed, so that we can tell the native code to start and stop listening for battery
events. I can't see a way to do that unless we monkeypatch {{addEventListener}} et al.

Any ideas, Pat?
                
> Do we need to monkey patch addEventListener()?
> ----------------------------------------------
>
>                 Key: CB-514
>                 URL: https://issues.apache.org/jira/browse/CB-514
>             Project: Apache Callback
>          Issue Type: Bug
>          Components: CordovaJS
>            Reporter: Patrick Mueller
>            Assignee: Filip Maj
>
> discussion here: http://markmail.org/message/mghdkbumdyjhmaye
> I noticed in cordova.js we override the following messages on window/document:
> {noformat}
> document.addEventListener = function(evt, handler, capture) {...}
> window.addEventListener = function(evt, handler, capture) {...}
> document.removeEventListener = function(evt, handler, capture) {...}
> window.removeEventListener = function(evt, handler, capture) {...}
> {noformat}
> aka as "monkey patching".  
> Apparently, we aren't sure why we're doing this.  My guess is that we've done this in
the past when dispatching user-land events wasn't possible, and so trapping listeners was
the only way to get the listeners so you could send them events.
> It would be nice to remove this monkey patching, if we can, by using:
> {noformat}
> event = document.createEvent('Events')
> event.initEvent(blah)
> window.dispatchEvent(event)
> // or document.dispatchEvent(event)
> {noformat}
> We'll need to figure out if this works on all our platforms.  Even if it doesn't work
on all of them, I think we should only use monkey patching on platforms that we have to.

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