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joi, 28 mai 2015

[OmniFaces utilities 2.0] Add globally a parameterized flash scoped WARN faces message

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


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

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

The myAction() method perform some tasks, including generating a global WARN 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 !";
public String myAction() {
// add an WARN message as a global message in flash scope
Object[] params = new Object[]{"Mark Rightwer", 5};
Messages.addFlashGlobalWarn(USER_WARN, params);
// or
Messages.addFlashGlobalWarn(USER_WARN, "Mark Rightwer", 5);

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, or any other approach capable to display the global 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.

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