On Friday 09 November 2007 11:22:20 Toscano wrote:
> Hello,
>
> I found some questions related to this topic, but I couldn't make it to
> work.
> I have two dropdowns, countries and regions. The easy thing is that I load
> the regions when the country has been selected, and I use
> AjaxFormComponentUpdatingBehavior for this and works.
> The thing is that we don't have Regions for all the countries, so in that
> cases I want to disable the dropdown.
>
> This is the code I have:
>
>
> // countryWork is the first dropdown
> countryWork.add(new AjaxFormComponentUpdatingBehavior("onchange")
> {
> protected void onUpdate(AjaxRequestTarget target)
> { target.addComponent(regionWork); }
> });
>
> // and regionWork is the region
>
> IModel regionModelChoices = new AbstractReadOnlyModel()
> {
> public Object getObject(Component component)
> {
> if (professionalInfo.getCountryWork()!=null)
> regions =
> getRegionDaoInterface().getRegions(professionalInfo.getCountryWork().getCou
>ntryID()); if (regions.size()==0)
> regionWork.setEnabled(false);
> else
> regionWork.setEnabled(true);
> return regions;
> }
> };
>
> regionWork = new DropDownChoice("regionWork", new Model(),
> regionModelChoices,
> new ChoiceRenderer("regionName", "regionID"));
> regionWork.setOutputMarkupId(true);
>
> The dropdown changes, but with one refresh delay. For example, I have
> regions for Canada but not for Spain. If I change to Canada, nothing
> happens, but the next change in the country will enable the dropdown.
>
> Any ideas?
>
> Thank you very much for your time,
> Oskar
Probably that is because this component is already rendered.
In general you shouldn't change components state inside a model because this
code is called at render stage. In your case you can call
regionWork.setEnabled() inside onUpdate(AjaxRequestTarget target).
Dima
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