When should I use h:outputLink instead of h:commandLink?

Question

When should I use an instead of an ?

I understand that a commandLink generates an HT

Answer 1

The renders a fullworthy HTML element with the proper URL in the href attribute which fires a bookmarkable GET request. It cannot directly invoke a managed bean action method.

link text

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The renders a HTML element with an onclick script which submits a (hidden) POST form and can invoke a managed bean action method. It's also required to be placed inside a .

The ?faces-redirect=true parameter on the , which triggers a redirect after the POST (as per the Post-Redirect-Get pattern), only improves bookmarkability of the target page when the link is actually clicked (the URL won't be "one behind" anymore), but it doesn't change the href of the element to be a fullworthy URL. It still remains #.

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Since JSF 2.0, there's also the which can take a view ID (a navigation case outcome) instead of an URL. It will generate a HTML element as well with the proper URL in href.

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So, if it's for pure and bookmarkable page-to-page navigation like the SO username link, then use or . That's also better for SEO since bots usually doesn't cipher POST forms nor JS code. Also, UX will be improved as the pages are now bookmarkable and the URL is not "one behind" anymore.

When necessary, you can do the preprocessing job in the constructor or @PostConstruct of a @RequestScoped or @ViewScoped @ManagedBean which is attached to the destination page in question. You can make use of @ManagedProperty or to set GET parameters as bean properties.

See also:

• ViewParam vs @ManagedProperty(value = "#{param.id}")
• What can , and be used for?
• Bookmarkability via View Parameters feature
• How to navigate in JSF? How to make URL reflect current page (and not previous one)