为什么commandButton的action属性不能与ajax render一起使用

Question

This commandButton is working:

<h:commandButton id="button_updateIt" value="#{i18n.button_update_it}"
    action="#{masterBean.update()}">         
</h:commandButton>

This ajax call is working:

<h:commandButton id="button_updateIt" value="#{i18n.button_update_it}">
    <f:ajax event="click" render=":form_2:updateMe" />            
</h:commandButton>

Why is the action attribute combined with ajax not working?

<h:commandButton id="button_updateIt"
    value="#{i18n.button_update_it}"
    action="#{masterBean.update()}">

    <f:ajax event="click" render=":form_2:updateMe" />

</h:commandButton>

I use jsf version 2.1.1 and java 1.7.0 and GlassFish Server 3.1.2 (build 23)

Answer 1

Why you're using the click event? Your form is rerendered before the action method is invoked if you're using that event.

You need to either change the event type or you need to use an listener in the f:ajax click event instead of the action in the commandButton.

<h:commandButton id="button_updateIt"
    value="#{i18n.button_update_it}"
    action="#{masterBean.update()}">

    <f:ajax render=":form_2:updateMe" />

</h:commandButton>

or

<h:commandButton id="button_updateIt"
    value="#{i18n.button_update_it}">

    <f:ajax event="click" listener="#{masterBean.update()}" 
      render=":form_2:updateMe" />

</h:commandButton>