Hi Francois,

Thanks, but actually this still has issues.  At first I thought it was
clearly the simple thing I was missing, but then I remembered there's still
a problem - the line in renderHead copied from the original
MultiFileUploadField uses private members container, max, and upload, so the
extending class won't be able to do this.  I realize I could create my own
versions of each of these (like you suggested with YOURJS), and then
override every method that uses any of them, replacing the reference with
the new versions.  But that might propagate to usage of other fields, and at
that point it might be simpler to just copy the entire contents of the
original class's code into a new version of the class of my own, with the
only modification being the location of the .js resource.  Neither of these
two things would be hard to do, and maybe they are simply the only
solutions, but it feels like that's not great, because it loses the ability
to leverage the fact that future versions of the api class might improve in
other ways and there'd be maintenance issues keeping my version up-to-date
with the rest of the api.  Is that just what needs to be done, or is there
possibly some other way to use the existing class directly and just swap
some alternate resource file in place of the default one? 

Thanks again,

Francois Meillet wrote
> Hi Evan,
> try this
> private static final ResourceReference YOURJS = new
> JavaScriptResourceReference( YourClassWhereJavascriptReside.js.class,
> "YourModifiedJavascript.js");
> @Override
> public void renderHead(IHeaderResponse response)
> {
>       response.render(JavaScriptHeaderItem.forReference(YOURJS));
>       response.render(OnDomReadyHeaderItem.forScript("new MultiSelector('" +
> getInputName() +
>                               "', document.getElementById('" + 
> container.getMarkupId() + "'),
> " + max + ",'" +
>                               getString("org.apache.wicket.mfu.delete") +
> "').addElement(document.getElementById('" +
>                               upload.getMarkupId() + "'));"));
> }

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