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https://issues.apache.org/jira/browse/TAPESTRY-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12507653
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Howard M. Lewis Ship commented on TAPESTRY-1583:
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I dug around a little and I see the problem.
The block: binding prefix is evaluated "in line", so you are right, it can't
reference blocks that haven't yet been encountered during the processing of the
template.
I'll defer out the resolution of the block until it is needed and that should
take care of the problem.
> Cannot Pass Blocks to Layout Components
> ---------------------------------------
>
> Key: TAPESTRY-1583
> URL: https://issues.apache.org/jira/browse/TAPESTRY-1583
> Project: Tapestry
> Issue Type: Bug
> Affects Versions: 5.0.4
> Reporter: Jeremy F. Kassis
>
> As per
> http://tapestry.apache.org/tapestry5/tapestry-core/guide/templates.html, the
> template of a page that calls a layout component must look like this:
> <t:layout xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
> My Page Specific Content
> </t:layout>
> The layout component looks like this:
> <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
> <head>
> <title>My Tapestry Application</title>
> </head>
> <body>
> <t:body/>
> </body>
> </html>
> If I want a more sophisticated layout that renders blocks passed as
> parameters instead of just a body, i'd be tempted to try this:
> <t:layout xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";
> block1="block:block1" block2="block:block2">
> <t:block id="block1">My Page Specific Content for Block 1</t:block>
> <t:block id="block2">My Page Specific Content for Block 2</t:block>
> </t:layout>
> But tapestry can't bind block1 and block2, because they appear in the
> template after the binding point.
> This solution works, but produces an extra <html> tag in the output document:
> <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
> <t:block id="block1">My Page Specific Content for Block 1</t:block>
> <t:block id="block2">My Page Specific Content for Block 2</t:block>
> <t:layout block1="block:block1" block2="block:block2"></t:layout>
> </html>
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