[jira] Assigned: (TAP5-205) Loop component: Add possibility to specify a block when source iterable is empty

["Howard M. Lewis Ship (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAP5-205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Howard M. Lewis Ship reassigned TAP5-205:
-----------------------------------------

    Assignee: Howard M. Lewis Ship

> Loop component: Add possibility to specify a block when source iterable is empty
> --------------------------------------------------------------------------------
>
>                 Key: TAP5-205
>                 URL: https://issues.apache.org/jira/browse/TAP5-205
>             Project: Tapestry 5
>          Issue Type: Improvement
>    Affects Versions: 5.0.15
>            Reporter: D. Marquis
>            Assignee: Howard M. Lewis Ship
>            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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