JSF：如何使用selectOneRadio立即更新后备bean？

Question

I have a choice of four locations, presented as a "selectOneRadio". When I select one location, the bean gets updated when I click to one of the commandLinks.

<ui:composition template="/WEB-INF/templates/BasicTemplate.xhtml">
    <ui:define name="content">
    <h:form>
    <h:commandLink action="#{wrapper.goBack}" value="GESTERN"></h:commandLink>
    ---------
    <h:commandLink action="#{wrapper.goForward}" value="MORGEN"></h:commandLink>
    <br />
    <h:selectOneRadio id="locationSelection" value="#{wrapper.actualLocation}" >
        <f:selectItems value="#{wrapper.allLocations}" var="actualLocation" ></f:selectItems>
    </h:selectOneRadio>
</h:form>    
</ui:define>
</ui:composition>

What do I have to change when I want an immediate change of the backing bean when I click on a radio button?

Any help is very appreciated.

Answer 1

To perform the submit at the time of click, you need to use Ajax.

For JSF 1.2, that means you need to use one of the many ajax frameworks for JSF (like richfaces with A4J).

For JSF 2.x, it's built-in.

<ui:composition template="/WEB-INF/templates/BasicTemplate.xhtml">
    <ui:define name="content">
    <h:form>
    <h:commandLink action="#{wrapper.goBack}" value="GESTERN"></h:commandLink>
    ---------
    <h:commandLink action="#{wrapper.goForward}" value="MORGEN"></h:commandLink>
    <br />
    <h:selectOneRadio id="locationSelection" value="#{wrapper.actualLocation}" >
        <f:selectItems value="#{wrapper.allLocations}" var="actualLocation" ></f:selectItems>
        <f:ajax event="click" />
    </h:selectOneRadio>
</h:form>    
</ui:define>
</ui:composition>

This will submit the form as soon as the radio button is clicked. You can also specify which fields to process, and which to rerender.

See: http://mkblog.exadel.com/2010/04/learning-jsf-2-ajax-in-jsf-using-fajax-tag/