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https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645114#action_12645114
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Howard M. Lewis Ship commented on TAP5-1:
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Further, your code can inject the Request object and check its .isXHR() method
to determine what to return: probably this (the current page object) for a
non-Ajax request.
> AJAX ActionLink exception if clicked as page loads
> --------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the
> second link specifies a zone.
> If you click on the two links in quick succession then an exception is
> thrown. Alternatively, just Reload the page and click on the second link
> before the page has finished reloading and you'll get the same exception.
> Here's the page, with source:
> http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value [EMAIL PROTECTED] Return
> type org.apache.tapestry5.internal.structure.BlockImpl can not be handled.
> Configured return types are java.lang.Class, java.lang.String, java.net.URL,
> org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse,
> org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is
> loaded. It's also been suggested to "check Request#isXhr in your event
> handler to see if it's an AJAX request - if it's not you can't return a
> Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink
> out-of-the-box, it would be nice if the framework handled it so we don't have
> to code around it.
> Geoff
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