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https://issues.apache.org/jira/browse/TAP5-682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750067#comment-13750067
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Jochen Kemnade commented on TAP5-682:
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This is fixed for Tapestry 5.4; the event is {{t5/core/events.zone.willUpdate}}.
> Introduce zone before update event
> ----------------------------------
>
> Key: TAP5-682
> URL: https://issues.apache.org/jira/browse/TAP5-682
> Project: Tapestry 5
> Issue Type: New Feature
> Components: tapestry-core
> Affects Versions: 5.1.0.4
> Reporter: Nikita Koksharov
>
> At this moment we have a ZONE_UPDATED_EVENT, but it would be very useful to
> have a ZONE_BEFORE_UPDATE_EVENT. This event should be fired before ajax
> request sended and must contain some information about request: url,
> elementId... etc.
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