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Definition of Whitebeam XML Tags
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rb:test
Conditionally include a section of XML BodyThe body of this tag contains any valid HTML/XML. The tag implementation looks for rb:true and rb:false
tags and conditionally executes them depending on the result of the 'expr' attribute. Attributes
| Attribute |
Required |
Description | expr | implied |
The expression to be evaluated. The result is taken as 'true' according
to the same behaviour as a JavaScript conditional expression. If this attribute is missing
then *none* of the contained blocks are sent to the output document.
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Remarks The 'rb:test' collection of tags allow the Pattern Pages to represent conditional
sections of HTML in the output stream without the need to resort to JavaScript.
Example:
<body>
<h1>Customer Information</H1>
<rb:test expr="rb.context.identifiedUser">
<rb:true>
<Table>
<TR><TD>Name</TD>
<TD><rb:eval
expr="user.name"></TD>
</TR>
<TR><TD>DOB</TD>
<TD><rb:eval
expr="user.dob"/></TD>
</TR>
</Table>
</rb:true>
<rb:false>
<H1>You need to login first!</H1>
</rb:false>
</rb:test>
...
In this example the value of 'rb.context.identifiedUser' is tested. If the
value is non-zero there is a valid user and a description of that user is sent
to the browser. If the value is zero then an error message is displayed.
Note that the 'rb:test' tag is executed when the output is being generated.
The various tags within the test may contain server side script which is only
executed if that optional tag becomes part of the output of that page.
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(loadtime : 8ms) |
