[OmniFaces utilities 2.0] Add in flash scope a parameterized global (or to the given client ID) WARNING faces message

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[OmniFaces utilities] The addFlashWarn() method adds a flash scoped WARNING faces message to the given clientId, with the given message body which is formatted with the given parameters. Use this when you need to display the message after a redirect.

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Method:

See also: Faces#getContext() | Faces#getFlash()

Usage:

The information stored in flash scope "survives" one redirect. Let's suppose that the below code is in page A.xhtml:

<h:form>

 <h:commandButton value="Click Me!" action="#{myBean.myAction()}"/>

</h:form>

The myAction() method perform some tasks, including generating a global WARNING parameterized messages and redirecting to page, B.xhtml:

import org.omnifaces.util.Messages;

...

// WARN message

private static final String USER_WARN = "The {0} user has reached the maximum number, {1}, of submissions !";

...

// for a certain component, replace null with clientId

public String myAction() {

// add a WARNING message as a global message in flash scope

Object[] params = new Object[]{"Mark Rightwer", 5};

Messages.addFlashWarn(null, USER_WARN, "Mark Rightwer", 5);

// or

Messages.addFlashWarn(null, USER_WARN, params);

return "B?faces-redirect=true";

}

Now, in page B.xhtml, you will see this message:

// WARN message

The Mark Rightwer user has reached the maximum number, 5, of submissions !

Note Don't forget to use in page where the messages are displayed the <h:messages>, for global messages, <h:message>, for component messages, or any other approach capable to display the messages.

Note By default, this example uses the OmniFaces default message resolver, but you can use your own message resolver as in Working with OmniFaces Message Resolvers.

API GH