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https://issues.apache.org/jira/browse/WICKET-6914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17399388#comment-17399388
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Sven Meier commented on WICKET-6914:
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[~mgrigorov] yes, that should work.
> Visibility change of "File Upload" via ajax causes "missing" form-data
> ----------------------------------------------------------------------
>
> Key: WICKET-6914
> URL: https://issues.apache.org/jira/browse/WICKET-6914
> Project: Wicket
> Issue Type: Bug
> Affects Versions: 9.4.0
> Environment: Tested with Tomcat 8.5 and Firefox 90.0.2
> Reporter: Sebastian Frömel
> Priority: Major
> Attachments: WICKET-6914.zip
>
>
> I am not 100% sure this could be counted towards a bug.
>
> Hello reader :)
> We have have a file upload component within a Form. Via OnChangeAjaxBehavior
> we set the visibility for this file upload to false and put the file upload
> component into the target.add();
> This of course removes the file upload form the UI, as expected. But after
> pressing the submit button (no ajax), it will complain that our required text
> fields are not filled. But they were. They are "nulled" after the request.
> Side note: TextField has no value on the UI after submit. TextArea seems to
> keep its value, but both are processed/validate "empty", during their
> required-validation.
>
> We think we found the possible issue.
> form + file upload = multipart form
> form - file upload = "normal form".
> It looks like that removing the file upload component via ajax, the form in
> the browser stays multipart, but wicket (probably) expects a "normal" form.
> Since we do not want to repaint the whole form at this point, since we do not
> send the data via ajax to the backend, we simply keep now the file upload
> visible, until it makes are workflow problem big enough to be solved another
> way.
> Do you think this is a bug, or just "us" using wicket the wrong way?
>
> Best,
> Sebastian
>
>
>
>
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