Add a new method hasBody() to ComponentRessource
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Key: TAPESTRY-2542
URL: https://issues.apache.org/jira/browse/TAPESTRY-2542
Project: Tapestry
Issue Type: New Feature
Components: tapestry-core
Affects Versions: 5.0.13
Reporter: Martin Papy
Same idea as in Tapestry-2541 but in a much lighter way :
In my case, I use the Layout pattern for rendering my pages, but depending on
the situation, sometimes the body of the layout is empty. In that case I would
like to display a generic content. So I imagine something like this :
<t:if test="hasBody">
Blah blah blah
<t:parameter name="else">
<t:body />
</t:parameter>
</t:if>
But I don't know how to write the test "hasBody".
HLS said this :
"This is not currently possible, but that's mostly an API issue. The Tapestry
component has, internally, its body (as an array of TemplateToken objects) and
can determine if the body is empty or not. It's a bit more complicated to
determine if a Mixin on the component may affect rendering of the body (by
providing BeforeBody or AfterBody render phase methods). I could implement a
method on ComponentResources: boolean hasBody(). Without an API change this
will be difficult."
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