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https://issues.apache.org/jira/browse/TAP5-1106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858664#action_12858664
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Leonard Lu commented on TAP5-1106:
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onException takes an Ajax.Request instance as its first parameter, not
Ajax.Response, therefore line 327 of tapestry.js:
Tapestry.debug(Tapestry.Messages.ajaxFailure + exception, response);
will result in the cryptic message "Ajax failure: Status for : [object Object]"
> Tapestry.ajaxFailureHandler has an incorrect signature for an Ajax.Request
> onException callback
> -----------------------------------------------------------------------------------------------
>
> Key: TAP5-1106
> URL: https://issues.apache.org/jira/browse/TAP5-1106
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.2.0, 5.1.0.5
> Reporter: Leonard Lu
> Assignee: Howard M. Lewis Ship
> Priority: Minor
> Fix For: 5.2.0
>
>
> From the Prototype Ajax documentation ( http://api.prototypejs.org/ajax/ ):
> "onException: Triggered whenever an XHR error arises. Has a custom
> signature: the first argument is the requester (i.e. an Ajax.Request
> instance), and the second is the exception object."
> All other callbacks "are invoked with two parameters: the Ajax.Response
> object and the result of evaluating the X-JSON response header, if any (can
> be null)."
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