Question

I have multiple input field with a p:ajax with a listener. They all connect to the same listener. How can I know what component triggerd the listener?

<h:inputText id="postalCode" size="20" value="# businessPartner.primaryAddress.postalCode}" 
<p:ajax event="change" listener="#{businessPartner.primaryAddress.retrievePostalCodeCity}"  >
</p:ajax>  
</h:inputText>

<h:inputText id="city" size="60" value="# businessPartner.primaryAddress.city}" 
<p:ajax event="change" listener="#{businessPartner.primaryAddress.retrievePostalCodeCity}"  >
</p:ajax>  
</h:inputText>



public void retrievePostalCodeCity() throws MWSException {
    int country = address.getCountryId();
    String postalCode = address.getPostalCode();
    String city = address.getCity();
}

I have this problem because I used to use a4j ajax, but I’m moving the project to fully primefaces and no longer richfaces. The listener to a4j has an AjaxBehaviorEvent event and there I could do event.getComponent().getId()

How can I do the same with prime ajax?

Answer 1

The AjaxBehaviorEvent is not specific to RichFaces. It’s specific to JSF2 itself. So you can just keep using it in PrimeFaces.

public void retrievePostalCodeCity(AjaxBehaviorEvent event) {
    UIComponent component = event.getComponent();
    // ...
}

As an alternative, or for the case that it’s really not possible elsewhere, you could always use the new JSF2 UIComponent#getCurrentComponent() method.

public void retrievePostalCodeCity() {
    UIComponent component = UIComponent.getCurrentComponent(FacesContext.getCurrentInstance());
    // ...
}

By the way, the very same construct should work just fine with JSF2’s own <f:ajax>. I do not see any reason to use <p:ajax> here. It would however be the only way if you were actually using a PrimeFaces component such as <p:inputText>.

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Unrelated to the concrete problem, the event="change" is the default already. You can just omit it.