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https://issues.apache.org/jira/browse/WICKET-2214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765167#action_12765167
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Gabriel LANDON commented on WICKET-2214:
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It's written in the javadoc of the ModalWindow :
*...
* If you want to use form in modal window component make sure that you put the
modal window itself
* in another form (nesting forms is legal in Wicket).
*
* @see IPageSettings#setAutomaticMultiWindowSupport(boolean)
* @author Matej Knopp
*/
Putting the ModalWindow inside a form also solve the problem of the DatePicker
not displaying properly with IE.
> Form tag in ModalWindow html code causes nested html forms when ModalWindow
> is used with panel that contain forms
> -----------------------------------------------------------------------------------------------------------------
>
> Key: WICKET-2214
> URL: https://issues.apache.org/jira/browse/WICKET-2214
> Project: Wicket
> Issue Type: Bug
> Components: wicket-extensions
> Affects Versions: 1.3.5, 1.3.6, 1.4-RC2
> Reporter: Jor
> Assignee: Matej Knopp
> Attachments: modal.js.patch
>
>
> There is an extra form tag in modal window html code (modal.js ->
> Wicket.Window.getMarkup function), it causes problems when ModalWindow is
> used with panel that contain forms.
> I haven't found any use for that form tag as it cannot be referenced from
> java code (it has no wicket id) and it only causes problems by creating
> nested form tags (outter form from modal html with no wicket id and inner
> form from panel with wicket id) that some browsers cant handle and its
> againts W3C html specification.
> I had to replace it with div tag to get my panel working.
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