selectOneMenu & Richfaces help please?

[allenr98]

Hi all -

I'm brand spanking new to JSF and RichFaces. I have a task I need to accomplish and I'm certain RichFaces will do it for me, but I'm not sure how or even where to look.

Here's what I need to do: I have a page that has two select lists, right now implemented as <h:selectOneMenu> items. Each currently works independently. What I need to happen is when the user selects a value in the first pull-down, the options in the second pull-down should change based on the selection.

Can anyone direct me where to look? I'm a pretty good software plagarist, so a link to an example would help.

Thanks!
-- Rob

[sergeysmirnov]

Just do what you want. I.e. add a4j:support with event="onchange" to the first selectOneMenu and point to to the second selectOneMenu's id with reRender attribute.
If you have a validation rules on the other fields at the same form, add ajaxSingle="true" attribute to the a4j:support to prevent those unnecessary validations fired.
In case you still have a problem or/and misunderstanding, post the code snippet of the current page code you have problem with.

[allenr98]

Thanks, Sergey -- that should head me in the right direction. I'll post back either if I have trouble, or I'll post my solution.

-- Rob

[allenr98]

That worked great!

The tag I added to my selectOneMenu item was:

<a4j:support event="onchange" reRender="toGeneralist" ajaxSingle="true"/>

...where the selectOneMenu I wanted to affect had an id="toGeneralist".

One little thing I had to work out on my own was that within the bean method that generates the list for my "toGeneralist" pull-down menu, in order to modify the query with the selected item from the first menu I had to inject the seam component that was the target of the selected value.

In other words, my selectOneMenu was:

<h:selectOneMenu id="projectDistrict" value="#{esrsList.esrs.projectDistrict}" required="false">

So in the bean method I needed a declaration:

@In EsrsList esrsList;

I could then reference the component as a parameter to my query as follows:

query.setParameter("district", "#{esrsList.esrs.projectDistrict}");

That's all standard Seam stuff, though. The RichFaces thing worked perfectly.

Thanks very much (and I hope this thread helps some other n3wbi3 down the road)!

-- Rob