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https://issues.apache.org/jira/browse/TAP5-957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969893#action_12969893
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Raul Montes commented on TAP5-957:
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Exactly that's the main problem with setting windowUnloaded=true on 
beforeunload event. It is triggered with download links... what I did as a 
workaround is to put a target="_blank" on links to download files. That way the 
beforeUnload event is not triggered. But I still think the correct event to 
listen is unload event, not beforeunload event. Someone on the Tapestry team 
can explain why use beforeunload instead? Is there a problem replacing it with 
unload event?

> Unexcept "beforeunload" event generated by ie
> ---------------------------------------------
>
>                 Key: TAP5-957
>                 URL: https://issues.apache.org/jira/browse/TAP5-957
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-core
>    Affects Versions: 5.1.0.5
>            Reporter: mindhawk
>            Priority: Minor
>
> IE will generate a "beforeunload " event when a link such as "<a 
> href='javascript:show()'>show</a>"  is clicked. So Tapestry.windowUnloaded is 
> set to true. That means all ajax request have no chance to refresh the page 
> after this event.
> Now, I have to set Tapestry.windowUnloaded=false, every time I want to send a 
> ajax request. I don't think thisis a good practice. 
> I think there will be some more smart approach to replace 
> Tapestry.windowUnloaded, or just remove it. because, the request is sent to 
> the server no matter the value is true or false. This value is only discard 
> the responses from the server.

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