Tapestry Core

org.apache.tapestry5.corelib.components.Unless

A close relative of the If component that inverts the meaning of its test. This is easier than an If component with the negate parameter set to true.

Name	Type	Flags	Default	Default Prefix	Since	Description
else	Block	NOT Allow Null		literal		An alternate Block to render if AbstractConditional#test() is false. The default, null, means render nothing in that situation.
test	boolean	Required, NOT Allow Null		prop		If true, then the body of the If component is rendered. If false, the body is omitted.