[jira] Commented: (WICKET-2933) Form.MULTIPART_HINT is not cleared correctly with nested forms

["Alex Grant (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/WICKET-2933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12900145#action_12900145 ] 

Alex Grant commented on WICKET-2933:
------------------------------------

This error is still present in Wicket 1.4.10

> 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, WICKET-2933-with-Exception.zip, WICKET-2933-with-Exception.zip, wicket-2933.tar.gz
>
>
> 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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