How to know which component triggerd an p:ajax request

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?

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>.

---

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

Answer 2

It is almost same in primefaces:

 <p:ajax event="change" listener="#{businessPartner.primaryAddress.retrievePostalCodeCity}"  />


import javax.faces.event.AjaxBehaviorEvent;
.....
public void retrievePostalCodeCity(AjaxBehaviorEvent event) {
...
}

If you want to access via button component action/actionListener tag you can use ActionEvent and for any case make sure you set ajax="true":

<p:commandLink actionListener="#{businessPartner.primaryAddress.retrievePostalCodeCity}" ajax="true" />

import javax.faces.event.ActionEvent;

....

public void retrievePostalCodeCity(ActionEvent event) {
    ...
    }