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The InvokeActionEventListener will add support for new <f:event> types preInvokeAction and postInvokeAction. Those events are published during the beforephase and afterphase of INVOKE_APPLICATION respectively.
This event is supported on any UIComponent, including UIViewRoot, UIForm, UIInput and UICommand components. This thus also provides the possibility to invoke multiple action listeners on a single UIInput and UICommand component on an easy manner.
As this phase listener has totally no impact on a webapp's default behavior, this phase listener is already registered by OmniFaces own faces-config.xml and thus gets auto-initialized when the OmniFaces JAR is bundled in a webapp, so endusers do not need to register this phase listener explicitly themselves.
Replacement for preRenderView event
Clicking this link with a "test" request parameter
should force a redirect with a faces message in the flash scope which should appear below. This wouldn't
have worked when preRenderView event is been used.
Message:
Invoking multiple action listeners in UIInput and UICommand components
Typing in the input field and clicking the submit button of the below demo form should invoke several action listeners which should each set a global faces message.
<f:metadata>
<f:viewParam name="param" value="#{invokeActionBean.param}" />
<f:event type="postInvokeAction" listener="#{invokeActionBean.initParam}" />
</f:metadata>
<h3>Replacement for <code>preRenderView</code> event</h3>
<p>
Clicking <h:link value="this link" outcome="#{view.viewId}?param=test" /> with a "test" request parameter
should force a redirect with a faces message in the flash scope which should appear below. This wouldn't
have worked when <code>preRenderView</code> event is been used.
</p>
<p>
Message: <h:message for="param" />
</p>
<hr />
<h3>Invoking multiple action listeners in <code>UIInput</code> and <code>UICommand</code> components</h3>
<p>
Typing in the input field and clicking the submit button of the below demo form should invoke several
action listeners which should each set a global faces message.
</p>
<h:form>
<h:inputText value="#{invokeActionBean.input}">
<f:ajax event="keyup" execute="@this" listener="#{invokeActionBean.inputListener()}" render=":messages" />
<f:event type="preInvokeAction" listener="#{invokeActionBean.preInvokeAction}" />
<f:event type="postInvokeAction" listener="#{invokeActionBean.postInvokeAction}" />
</h:inputText>
<h:commandButton value="submit" action="#{invokeActionBean.submit}">
<f:ajax execute="@form" render=":messages" />
<f:event type="preInvokeAction" listener="#{invokeActionBean.preInvokeAction}" />
<f:event type="postInvokeAction" listener="#{invokeActionBean.postInvokeAction}" />
</h:commandButton>
</h:form>
<h:messages id="messages" globalOnly="true" />package org.omnifaces.showcase.eventlisteners;
import static org.omnifaces.util.Utils.isEmpty;
import java.io.IOException;
import java.io.Serializable;
import jakarta.faces.event.ComponentSystemEvent;
import jakarta.inject.Named;
import org.omnifaces.cdi.ViewScoped;
import org.omnifaces.util.Faces;
import org.omnifaces.util.Messages;
@Named
@ViewScoped
public class InvokeActionBean implements Serializable {
private static final long serialVersionUID = 1L;
private String param;
private String input;
public void initParam() throws IOException {
if (!isEmpty(param)) {
System.out.println("InvokeActionBean.initParam() " + Faces.getCurrentPhaseId());
Messages.addFlashInfo("param", "Param \"{0}\" is successfully set and you have been redirected!", param);
Faces.refresh();
}
}
public void inputListener() {
Messages.addGlobalInfo("Input entered so far: {0}", input);
}
public void submit() {
Messages.addGlobalInfo("Form submitted with input: {0}", input);
}
public void preInvokeAction(ComponentSystemEvent event) {
Messages.addGlobalInfo("preInvokeAction event executed on component: {0}", event.getComponent());
}
public void postInvokeAction(ComponentSystemEvent event) {
Messages.addGlobalInfo("postInvokeAction event executed on component: {0}", event.getComponent());
}
public String getParam() {
return param;
}
public void setParam(String param) {
this.param = param;
}
public String getInput() {
return input;
}
public void setInput(String input) {
this.input = input;
}
}