[richfaces-issues] [JBoss JIRA] (RF-12268) 4.1.0.final javascript error : element is null, ajax queue operation

[Ján Jamrich (JIRA)]

    [ https://issues.jboss.org/browse/RF-12268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697515#comment-12697515 ] 

Ján Jamrich commented on RF-12268:
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I've updated page with issue simulation.
Firstly I understood it wrong - I missed fact that second command button is conditionally rendered (I thought it had disappeared accidentally).

So now it example contains 2 buttons, first with action handler with 3s delay, and with updating variable value which is used as condition to render second command button.

(Note: you should get this application (Metamer) from git at github.com:richfaces/qa.git (module Metamer/application) to play around this example. I referred to this example running on my laptop in my comment above.
                
> 4.1.0.final javascript error : element is null, ajax queue operation
> --------------------------------------------------------------------
>
>                 Key: RF-12268
>                 URL: https://issues.jboss.org/browse/RF-12268
>             Project: RichFaces
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: component
>    Affects Versions: 4.1.0.Final
>            Reporter: zhifu Jin
>              Labels: richfaces, waiting_on_user
>   Original Estimate: 1 day
>  Remaining Estimate: 1 day
>
> the issue is when have two requests like below will cause js error:"element is null" and browser crash.   
>                1. first request sending, and don't have response arrived.
>                2. the second request start, will add this request into queue.
>                3. first response arrived , the second request will be dequeue and send request, it will find source element first,  and our page had changed, the element is null.

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