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https://issues.apache.org/jira/browse/TAP5-1941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470307#comment-13470307
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Jan Mynařík commented on TAP5-1941:
-----------------------------------
The same applies to tree component.
> Alerts component should check for XHR request in "dismiss" event handler
> ------------------------------------------------------------------------
>
> Key: TAP5-1941
> URL: https://issues.apache.org/jira/browse/TAP5-1941
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.3.3
> Reporter: Felix Gonschorek
> Priority: Minor
>
> The Alerts component does not check for request.isXHR() in the "onDismiss"
> event handler.
> Crawlers (Googlebot) send non-xhr requests to the "onDismiss" event-url and
> generate errors on my server, because the returned JSONObject is not a valid
> return value from an event handler.
> org.apache.tapestry5.runtime.ComponentEventException: A component event
> handler method returned the value {}. Return type
> org.apache.tapestry5.json.JSONObject can not be handled.
> A check for request.isXHR() and a conditional return value (null for non-ajax
> requests, the json object for ajax requests) should fix this.
> thanks!
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