Change values in dropdown dynamically

[meraj zia]

Hi,
I've two dropdowns on my jsf page.
I want to change the values of second one based on the value selected in the first. So once the user selects some values in dropdown 1 the values in dropdown 2 should be refetched.
How to do this?

[Anil Gorthy]

You should be able to achieve this w/ PartialTriggers (FYI, I use Apache Trinidad). Here is a snippet of my JSF code:

First ListBox:

   
<tr:selectOneListbox id="processlistbox"
                             autoSubmit="true"
                             value="#{lotBean.processid}"
                             valueChangeListener="#{lotBean.processListChange}">
        <f:selectItems value="#{lotBean.process}"/>
</tr:selectOneListbox>
 

Second ListBox:

  
<tr:selectOneListbox id="equipmentlistbox"
                             autoSubmit="true"
                             value="#{lotBean.equipmentid}"
                             partialTriggers="processlistbox "
                             valueChangeListener="#{lotBean.equipmentListChange}">
         <f:selectItems value="#{lotBean.equipment}"/>
</tr:selectOneListbox>

Notice the second listbox: I have the partialTriggers attribute set to the id of the first listbox and in the backing bean whenever the user selects a value in the first listbox, this valuechange is captured and sent to populate the second box.

Hope this helps.