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https://issues.apache.org/jira/browse/WICKET-2933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885337#action_12885337
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Alex Grant commented on WICKET-2933:
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Thanks for the suggestion. I just tried it, but it didn't work. The page still
renders with enctype="multipart/form-data" even though both Forms have
setMultiPart(false) as the inner form still has Form.multiPart = MULTIPART_HINT
when the outer form renders onComponentTag.
> Form.MULTIPART_HINT is not cleared correctly with nested forms
> --------------------------------------------------------------
>
> Key: WICKET-2933
> URL: https://issues.apache.org/jira/browse/WICKET-2933
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.4.9
> Reporter: Alex Grant
> Attachments: WICKET-2933-quickstart.zip
>
>
> I have a page that looks like this
> * Page
> ** Form
> *** Wizard (contains another Form)
> **** StepOne - contains a FileUploadField
> **** StepTwo - has no FileUploadField
> (The outer form is there because I have some controls outside the wizard that
> needed to submit the wizard too).
> Because I have been using Ajax ModalDialogs, it has been important to get
> Form.multipart set correctly (otherwise they don't submit back correctly). So
> I override Wizard.onActiveStepChanged and checked to see if the new wizard
> step contained a FileUploadField, and set Form.setMultiPart accordingly.
> However, this only clears Form.MULTIPART_HARD, Form.MULTIPART_HINT is left
> untouched.
> When I step from StepOne to StepTwo, the inner form still has MULTIPART_HINT
> set as it contained a FileUploadField last render. Then the outer form's
> onRender fires, which clears MULTIPART_HINT, then the outer form's
> onComponentTag fires. When it checks isMultiPart(), it evaluates to true as
> the nested Form still returns true from its MULTIPART_HINT, and therefore
> tag.put("enctype", "multipart/form-data"); is executed. After that, the inner
> form's onRender fires which clears its MULTIPART_HINT.
> When I try to submit StepTwo, the html has enctype="multipart/form-data", so
> it does a multipart submit. But wicket is not expecting a multipart submit so
> it doesn't find any of the submitted form data, and cannot determine which
> button is pressed, and loses all the form content.
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