InvokeActionEventListener will add support for new
postInvokeAction. Those events are published during the beforephase and afterphase of
INVOKE_APPLICATION respectively. This actually offers a better hook on invoking actions after the
<f:viewParam> values been set than the
preRenderView event. In some circumstances the
preRenderView event might be too late. For example, when you need to set a faces message in the flash scope and send a redirect. Also, it won't be invoked when the validations phase has failed for one of the
<f:viewParam> values, in contrary to the
Note that the upcoming JSF 2.2 will come with a
<f:viewAction> tag which should actually solve the concrete functional requirement for which a
<f:event type="preRenderView"> workaround is often been used in JSF 2.0 and 2.1.
This event is not only supported on
UIViewRoot, but it is also supported on
UICommand components. This thus also provides the possibility to invoke multiple action listeners on a single
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.
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.
Invoking multiple action listeners in
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.