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https://issues.apache.org/jira/browse/WICKET-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167499#comment-13167499
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Sven Meier commented on WICKET-4287:
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Wicket renders the page parameter into the form action and these conflict with
the request parameter added by the drop-down, e.g. "sport".
For a workaround rename the page parameter or your drop-down's id.
Question to other devs:
Why does the action url include the page parameters, e.g.
"?8-1.IFormSubmitListener-form&sport=baseball", i.e. MountedMapper#buildUrl()
calls AbstracMapper#encodePageParameters().
> DropDownChoice loses selection after submit when model set via URL param
> ------------------------------------------------------------------------
>
> Key: WICKET-4287
> URL: https://issues.apache.org/jira/browse/WICKET-4287
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.5.3
> Environment: Mac OSX Lion, JDK 1.6.0_29
> Reporter: George Armhold
> Attachments: menu-dropdown-bug.tar.gz
>
>
> I'm seeing some surprising behavior with DropDownChoice. My page takes a
> param and initializes a DropDownChoice model with it. So the drop-down can be
> initialized via a param in the URL like ?sport=baseball.
> I've got a submit button on the page, and I find that when the model is set
> via the URL, clicking submit sets the drop-down choice to null, if it was
> previously initialized via the URL. However if the user sets the drop-down
> interactively, it "survives" the form submit.
> I'll attach a quickstart that demonstrates it.
> 1. go to http://localhost:8080/?sport=baseball
> 2. click submit (without changing the drop-down)
> 3. observe that drop-down gets reset to "Any"
> 4. try choosing a sport via drop-down, say "archery"
> 5. click submit
> 6. observe that drop-down correctly preserves the choice
> This is with 1.5.3; it does not reproduce with 1.4.18. The quickstart
> includes a git project with 1.5.3 in master, and an additional branch
> "1.4.18" for showing that it doesn't happen under that release.
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