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https://issues.apache.org/jira/browse/WICKET-5039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580549#comment-13580549
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Martin Grigorov commented on WICKET-5039:
-----------------------------------------

I also don't know the roots of something|code feature. I've just migrated it 
from 1.5.x and even added JS tests for it.

And yes, it seems I broke it with the introduction of the anonymous function 
which is used to minimize the number of eval's to 1 and to keep the variables 
local for each prepend/append script.
                
> ajax post call handlers might not get called because of failure on AJAX 
> processEvaluation function
> --------------------------------------------------------------------------------------------------
>
>                 Key: WICKET-5039
>                 URL: https://issues.apache.org/jira/browse/WICKET-5039
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 1.4.21, 1.5.8, 6.5.0
>         Environment: any
>            Reporter: Ernesto Reinaldo Barreiro
>            Priority: Trivial
>         Attachments: WICKET-5039.patch, wicket5039.tar.gz
>
>   Original Estimate: 0h
>  Remaining Estimate: 0h
>
> We are having problems on Wicket 1.4.x with and "AJAX function" 
> processEvaluation... and I see the code is practically the same at 6.x. So, 
> let's bring the subject to the list... 
> Our problem is that after evaluating some expressions with errors, screen 
> "freezes" because post-call handlers are not called. Problem seems to be 
> related to the code. 
>                                 // test if the javascript is in form of 
> identifier|code
>                               // if it is, we allow for letting the 
> javascript decide when the rest of processing will continue
>                               // by invoking identifier();
>                               var res = text.match(new 
> RegExp("^([a-z|A-Z_][a-z|A-Z|0-9_]*)\\|((.|\\n)*)$"));
>                               if (res !== null) {
>                                       var f = jQuery.noop;
>                                       text = "f = function(" + res[1] + ") {" 
> + res[2] + "};";
>                                       try {
>                                               // do the evaluation
>                                               eval(text);
>                                               f(notify);
>                                       } catch (exception) {
>                                               
> Wicket.Log.error("Wicket.Ajax.Call.processEvaluation: Exception evaluating 
> javascript: " + exception + ", text: " + text);
>                                       }
>                               } 
>  In case of error. Shouldn't it be
>                                       try {
>                                               // do the evaluation
>                                               eval(text);
>                                               f(notify);
>                                       } catch (exception) {
>                                               
> Wicket.Log.error("Wicket.Ajax.Call.processEvaluation: Exception evaluating 
> javascript: " + exception + ", text: " + text);
>                                                 notify();
>                                       }
> So that next steps in processing get called. The above solves or freezing 
> problem in case of error

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