jsf - How do I change the second dropdown based on value changes from first dropdown using a4j? -


i using 2 dropdowns in jsf. need use a4j richfaces ajax call only. based on value change in 1st dropdown, have change display 2nd dropdown.

first dropdown having values: dc, rc , ab. in 2nd dropdpwn:

if value in dropdown 1 dc, change value in selectitem dc related subjects. ( have built list of subjects dc)

similarly if value in dropddown 2 rc, change value in selectitem dc related subjects. ( have built list of subjects dc)

if not dc or rc, show dropdpwn null values.

dropdown 1:

<h:selectonemenu id="skillsetarea"                  valuechangelistener="#{mybean.changeskillset}"                  value="#{mybean.skillset}">      <f:selectitem itemlabel=" " itemvalue="" />     <f:selectitems value="#{referencebean.skillsetcodes}" />     <a4j:support event="onchange" ajaxsingle="true"/> </h:selectonemenu>

dropdown 2:

<h:selectonemenu id="subjects"                  value="#{demobean.subjectcode}"                  disabled="#{demobean.showsubject}">      <f:selectitem itemlabel=" " itemvalue="" />     <f:selectitems value="#{demobean.showsubejctfordc}" /> </h:selectonemenu>


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