How to change the list in a SelectOneMenu, if the value is changed in another?

Question

Hey,

I want to change the SelectItem[] array in the second SelectOneMenu, if the value is changed in the first one. Is that possible?

Thanks in advance!

Answer 1

Should be possible if you bind a value change listener to the first selectOneMenu.

Get the new value from the ValueChangeEvent and update the list accordingly. the JSF page should then display the updated list.

Hope that makes sense!

Answer 2

I figured this out, but I used RichFaces's AJAX functionality, not only JSF. Just added the tag to my first selectOneMenu, and it works:)

<a4j:support event="onchange" action="#{bean.onChange}" reRender="otherSelectOneMenuID"/>

Thanks for the response anyway!

Answer 3

I have tried the Richfaces a4j:support, as suggested by wheelie. The second selectOneMenu is updated correctly, but when submitting the form, a NoSuchElementException is trhown. As if JSF is not aware of the updated values in the 2nd selectOneMenu. How to fix this?

java.util.NoSuchElementException
    javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:130)
    javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:154)
    javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:61)
    javax.faces.component.SelectUtils.matchValue(SelectUtils.java:82)
    javax.faces.component.UISelectOne.validateValue(UISelectOne.java:144)
    javax.faces.component.UIInput.validate(UIInput.java:875)
    javax.faces.component.UIInput.executeValidate(UIInput.java:1072)
    javax.faces.component.UIInput.processValidators(UIInput.java:672)
    javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1058)
    javax.faces.component.UIForm.processValidators(UIForm.java:235)
    javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1058)
    org.ajax4jsf.component.AjaxViewRoot$3.invokeContextCallback(AjaxViewRoot.java:442)
    org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:235)
    org.ajax4jsf.component.AjaxViewRoot.processValidators(AjaxViewRoot.java:458)
    com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
    org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
    org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
    org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)