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marți, 26 mai 2015

[OmniFaces utilities 2.0] Add in flash scope the given parameterized message body as faces message globally or to the given client ID (specify severity also)


[OmniFaces utilities] The addFlash() method adds a flash scoped faces message of the given severity 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.

Method:
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 global INFO/WARN/ERROR and FATAL parameterized messages and redirecting to page, B.xhtml:

import org.omnifaces.util.Messages;
...
// INFO message
private static final String FILES_UPLOADED = "The {0} file and associated extensions ({1}, {2} and {3}) were successfully uploaded !";
// WARN message
private static final String USER_WARN = "The {0} user has reached the maximum number, {1}, of submissions !";
// ERROR message
private static final String FILES_UPLOADED_ERROR = "The {0} file cannot be uploaded ! File size should be smaller than {1} bytes.";
// FATAL message
private static final String USER_FATAL = "The database at {0} does not respond on port {1} !";
...
// for a certain component, replace null with clientId
public String myAction() {
 // add a INFO message as a global message in flash scope
 Object[] params = new Object[]{"SHP", "SHX", "DBF", "SBN"};
 Messages.addFlash(FacesMessage.SEVERITY_INFO, null, FILES_UPLOADED, params);
 // or
 Messages.addFlash(FacesMessage.SEVERITY_INFO, null, FILES_UPLOADED, "SHP", "SHX", "DBF", "SBN");
 // add a WARN message as a global message in flash scope
 Messages.addFlash(FacesMessage.SEVERITY_WARN, null, USER_WARN, "Mark Rightwer", 5);
 // add a ERROR message as a global message in flash scope
 Messages.addFlash(FacesMessage.SEVERITY_ERROR, null, FILES_UPLOADED_ERROR, "order.txt", 1024);
 // add a FATAL message as a global message in flash scope
 Messages.addFlash(FacesMessage.SEVERITY_FATAL, null, USER_FATAL, "89.38.122.5", "5432");

return "B?faces-redirect=true";
}

Now, in page B.xhtml, you will see these messages:

// INFO message
The SHP file and associated extensions (SHX, DBF and SBN) were successfully uploaded !
// WARN message
The Mark Rightwer user has reached the maximum number, 5, of submissions !
// ERROR message
The order.txt file cannot be uploaded ! File size should be smaller than 1,024 bytes.
// FATAL message
The database at 89.38.122.5 does not respond on port 5432 !

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.

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