[jira] Updated: (TAP5-496) Change If and Unless to render thier template element if provided (i.e., when using t:type) as well as informal parameters

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

     [ https://issues.apache.org/jira/browse/TAP5-496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Howard M. Lewis Ship updated TAP5-496:
--------------------------------------

    Priority: Minor  (was: Major)
     Summary: Change If and Unless to render thier template element if provided (i.e., when using t:type) as well as informal parameters  (was: Dummy component which renders nothing)

> Change If and Unless to render thier template element if provided (i.e., when using t:type) as well as informal parameters
> --------------------------------------------------------------------------------------------------------------------------
>
>                 Key: TAP5-496
>                 URL: https://issues.apache.org/jira/browse/TAP5-496
>             Project: Tapestry 5
>          Issue Type: Improvement
>          Components: tapestry-core
>    Affects Versions: 5.0.18
>            Reporter: Folke Behrens
>            Assignee: Howard M. Lewis Ship
>            Priority: Minor
>
> I use a lot of dummy texts in my template to see what the page will actually look like when rendered. To filter out these fragments I created a "Dummy" component whose setupRender method always returns "false".
> I don't know if this is efficient but it would be nice to have something like this already in T5's component library.
> More efficient would be a special marker XML attribute that the template parser recognizes. Maybe something like a t:test attribute which is works like <t:if test="...">...</t:if>. If the contained expression evaluations to false or null the marked element is filtered.
> <ul>
>   <li t:test="show.item">conditional item</li>
>   <li t:test="literal:false">dummy item</li>
> </ul>

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