Form.MULTIPART_HINT is not cleared correctly with nested forms
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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
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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