What's happening here is that the form doesn't submit a field for "beacons"
at all if nothing is selected, so the callback doesn't get called. What I
typically do in scenarios like this is add a hidden field whose callback
clears the collection. In your case, you could move the
"location.beacons.clear" inside the hidden callback for "id" and have it all
taken care of.
Derek
On Wed, Sep 16, 2009 at 8:57 AM, Aaron Valade wrote:
>
> Hello all-
> I'm having an issue when trying to update a many-to-one collection
> attached to a JPA object in Lift. I'm currently using a
> SHtml.multiSelect for choosing which objects should be assigned to the
> many-to-one collection. My bind statement looks like this:
>
> bind("location", xhtml,
>"id" -> SHtml.hidden(() => locationVar(current)),
>"name" -> SHtml.text(location.name, location.name = _),
>"beacons" -> SHtml.multiSelect(choices, default, {bsIds : List
> [String] => {
>location.beacons.clear
>bsIds.map( id =>
> location.beacons.add(Model.getReference(classOf
> [Beacon], id.toLong) ) )
>} } ),
>"save" -> SHtml.submit(?("Save"), doAdd) )
>
> This works great when I'm adding or removing beacons to my location as
> long as I don't unselect all options. When I unselect all options, my
> closure for the multiSelect doesn't get called so the beacons Set
> doesn't get cleared out.
>
> How can I capture when I unselect everything in my multiSelect?
>
> Thanks in advance!
> - Aaron
>
> >
>
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