Paul Stanton created TAP5-2000:
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Summary: empty element causes 'unbalanced elements' exception
Key: TAP5-2000
URL: https://issues.apache.org/jira/browse/TAP5-2000
Project: Tapestry 5
Issue Type: Bug
Components: tapestry-core
Affects Versions: 5.3.3
Reporter: Paul Stanton
consider the following TML markup:
<col t:type="if" t:test="myTest"></col>
If 'myTest' is true, I want to render an empty <col> element, if it is false
render nothing.
TRUE: [<col></col>]
FALSE: []
however the above markup causes this exception:
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Component
MyPage:mycomponent.if_4 has rendered unbalanced elements; either it has started
an element with MarkupWriter.element() and not followed up with
MarkupWriter.end(), or it has invoked MarkupWriter.end() without first invoking
MarkupWriter.element(). [at classpath:com/me/components/MyComponent.tml, line
26]
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$PostRenderCleanupPhase.render(ComponentPageElementImpl.java:441)
at
org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72)
... 81 more
To work around, include any character (space) within the element:
<col t:type="if" t:test="myTest"> </col>
which renders:
TRUE: [<col> </col>]
FALSE: []
I also imagine you could do:
<t:if test="myTest"><col></col></t:if>
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