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https://issues.apache.org/jira/browse/WICKET-6517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16337057#comment-16337057
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ASF GitHub Bot commented on WICKET-6517:
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Github user martin-g commented on the issue:
https://github.com/apache/wicket/pull/256
Wicket Ajax has preconditions (`pre`) for canceling.
> use Ajax for multipart instead of iframe
> ----------------------------------------
>
> Key: WICKET-6517
> URL: https://issues.apache.org/jira/browse/WICKET-6517
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 8.0.0-M8
> Reporter: Sven Meier
> Assignee: Sven Meier
> Priority: Minor
>
> As Andrew Kondratev has pointed out on
> https://github.com/apache/wicket/pull/255, we can use FormData to send
> multipart data via Ajax. This makes the current iframe workaround obsolete.
> Advantages:
> - real Ajax !!1!!!
> - we can drop a lot of code in wicket-ajax-jquery.js
> - users can use Wicket.Ajax to send files as extra parameters, as requested
> in pull request #255
> FormData is supported in Edge and IE 10. I'm not sure whether we still
> support older browsers, but as fallback users can
> - continue using Wicket 7 (supported for the next years)
> - switch to non-Ajax uploads
> - use a polyfill for FormData (several available on github)
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