Loop component: Add possibility to specify a block when source iterable is empty
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Key: TAPESTRY-2213
URL: https://issues.apache.org/jira/browse/TAPESTRY-2213
Project: Tapestry
Issue Type: Improvement
Components: Core Components
Reporter: D. Marquis
Priority: Minor
I have a quick suggestion to improve the Loop component:
We should be able to specify a block to display if the loop source is
empty (size = 0)
<div t:type="loop" source="anEmptyList">
<t:parameter name="empty">There is no item matching your request</
t:parameter>
</div>
I know we can do this :
<t:if test="anEmptyList">
<div t:type="loop" source="anEmptyList">
</div>
<t:parameter name="else">There is no item matching your
request</t:parameter>
</t:if>
BUT this will have the result of calling the "getAnEmptyList()" getter
in the component code twice.
If you access the database in the getter (as the docs suggest quite a
few times), this will call the database twice for nothing.
Thanks ! :)
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