Conditionally displaying JSF components

Yes, use the rendered attribute.

 rendered="#{some boolean condition}">

where some boolean condition can be anything like:

 rendered="#{bean.booleanValue}" />
 rendered="#{bean.intValue gt 10}" />
 rendered="#{bean.objectValue eq null}" />
 rendered="#{bean.stringValue ne 'someValue'}" />
 rendered="#{not empty bean.collectionValue}" />
 rendered="#{not bean.booleanValue and bean.intValue ne 0}" />
 rendered="#{bean.enumValue eq 'ONE' or bean.enumValue eq 'TWO'}" />

Let's assume that the link is passing a parameter like

 href="page.xhtml?form=1">link

then you can show the form as follows

 rendered="#{param.form eq '1'}">

(the #{param} is an implicit EL object referring to a Map representing the request parameters)

See also:

• Java EE 6 tutorial - Expression Language

http://stackoverflow.com/questions/4870462/conditionally-displaying-jsf-components