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Checking if a tag exists [message #6540]

Fri, 23 March 2007 12:24

Eclipse User

Originally posted by: evaandoli.dodo.com.au

Is it possible to check whether a tag exists in the file ?
something like
<c:when exists $node/@name>

.. . . blah blah

</when>

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Re: Checking if a tag exists [message #6581 is a reply to message #6540]

Sun, 25 March 2007 01:45

Eclipse User

Originally posted by: evaandoli.dodo.com.au

Ok after a few days !!!
I came up with this:-
<c:setVariable select="cardinality($action/@rightOperand , 0)"
var="hasRightOperand"/>

<c:when test="$hasRightOperand">

.. . .. insert exist code to perform . . ..

</c:when>

<c:otherwise>

....... insert otherwise code to peroform. . ..

</c:otherwise>

</c:choose>

"Stu" <evaandoli@dodo.com.au> wrote in message
news:eu0v03$afr$1@utils.eclipse.org...
> Is it possible to check whether a tag exists in the file ?
> something like
> <c:when exists $node/@name>
>
> . . . blah blah
>
> </when>
>
>

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Re: Checking if a tag exists [message #6637 is a reply to message #6540]

Mon, 26 March 2007 08:23

Paul Elder
Messages: 844
Registered: July 2009

Senior Member

Stu:

It's easier than you think. XPath has rules for turning any value into a
boolean (here's a link to the XPath 'boolean' function:
http://www.w3.org/TR/xpath#function-boolean).

What you need:

<c:when test="$node/@name">

According to XPath, the expression '$node/@name' returns a NodeSet (in this
case, a set of Attribute nodes). If the attribute is not set, the NodeSet is
empty. XPath converts a NodeSet to boolean based on the cardinality of the
NodeSet. Anything larger than zero implies true, zero implies false.

Paul

"Stu" <evaandoli@dodo.com.au> wrote in message
news:eu0v03$afr$1@utils.eclipse.org...
> Is it possible to check whether a tag exists in the file ?
> something like
> <c:when exists $node/@name>
>
> . . . blah blah
>
> </when>
>
>

Report message to a moderator

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