Get click on h:selectOneListbox in BackingBean

[pschuett]

Hallo,

I am migrating from Richfaces 3.3.x to 4.0 (20101226)

I have a listbox of values and I want to call a setter in the backend bean if the selection is changed.

My old working solution was:

  <h:selectOneListbox id="waitingTaskInfos" value="#{userProcessingBean.selectedWaitingTaskId}"

            style="height:15em;min-width:15em">

       <a4j:support event="onclick" render="waitingTaskInfos, otherControl">

             <a4j:actionParam value="this.value" assignTo="#{userProcessingBean.selectedWaitingTaskId}"

                                                         name="selectedWaitingTask" noEscape="true"/>

      </a4j:support>

      <f:selectItems value="#{userProcessingBean.waitingTaskItems}"  />

  </h:selectOneListbox>

Waiting-Task-Items are of the type java.util.List<javax.faces.model.SelectItem>.

The value of SelectItem contains a String-ID.

The setter is setSelectedWaitingTaskId.

I changed to:

  <h:selectOneListbox id="waitingTaskInfos" value="#{userProcessingBean.selectedWaitingTaskId}"

            style="height:15em;min-width:15em">

       <a4j:ajax event="click" render="waitingTaskInfos, otherControl">

             <a4j:param value="this.value" assignTo="#{userProcessingBean.selectedWaitingTaskId}"

                                                         name="selectedWaitingTask" noEscape="true"/>

      </a4j:support>

      <f:selectItems value="#{userProcessingBean.waitingTaskItems}"  />

  </h:selectOneListbox>

This does not work. I also did not find an example to use h:selectOneListbox with a4j somewhere.

Thanks for any hint.

Ciao

  Peter Schütt

[ilya_shaikovsky]

From the beginning I'm not sure such construction has sence...

  <h:selectOneListbox id="waitingTaskInfos" value="#{userProcessingBean.selectedWaitingTaskId}"

            style="height:15em;min-width:15em">

       <a4j:support event="onclick" render="waitingTaskInfos, otherControl"/>

  </h:selectOneListbox>

and

  <h:selectOneListbox id="waitingTaskInfos" value="#{userProcessingBean.selectedWaitingTaskId}"

            style="height:15em;min-width:15em">

       <a4j:ajax event="click" render="waitingTaskInfos, otherControl"/>

  </h:selectOneListbox>

this code already means that new values will be populated to selectedWaitingTaskId.. so see no reason to use additional setting using parameter.

If you had any problems and just workarounded them in that way - it's better to make one step backward and solve original problems instead of using additional parameters.

[pschuett]

Hallo,

thanks for your hint. It was easier than I thought.

<h:selectOneListbox id="waitingTaskInfos" value="#{userProcessingBean.selectedWaitingTaskId}"

           style="height:15em;min-width:15em">

       <a4j:ajax event="click" render="waitingTaskInfos,otherControl">

       </a4j:ajax>

      <f:selectItems value="#{userProcessingBean.waitingTaskItems}"  />

</h:selectOneListbox>

This works.

Ciao

  Peter Schütt