Valuechangelistener

Question

hi
plz help me with this.
in my page i have a <h:selectOneMenu>. and i have populated it with an arraylist from the backing bean. i have bounded a valuechangelistener to this so that i could get the changed value when the new value is selected/but here im getting a null pointer exception.
plz help me with this.
<h:selectOneMenu
value="#{regBean.selectedState}" valueChangeListener="#{regBean.comboEvent}"     
binding="#{regBean.cmbState}"     onchange="this.form.submit();"
style=" position:absolute;left:400px;top:300px;width:135px;">
     <f:selectItems value="#{regBean.stateList}" />
</h:selectOneMenu>
public void comboEvent(ValueChangeEvent ve){
          try {
               String val=ve.getOldValue().toString();
               System.out.println(ve.getNewValue().toString());
          } catch (Exception e) {
               e.printStackTrace();
when i try to print the old value its coming.but when i try to print the newvalue im getting the error.
rgds

Answer 1

Hi,
Why don't you try to put the autosubmit property of the component to true instead of using the "onchange" to submit the changes ? Wouldn't that be better ? Along with the valuePassThru to true as well. So as to assure to pass the exactly value instead of the index of the selectItems.
Hope this helps.
Best Regards