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I have a set of data called <testData> with many nodes inside.
How do I detect if the node exists or not?
I've tried
<xsl:if test="/testData">
and
<xsl:if test="../testData">
Neither one works. I'm sure this is possible but I'm not sure how. :P
For context the XML file is laid out like this
<overall>
<body/>
<state/>
<data/>(the one I want access to
</overall>
I'm currently in the <body> tag, though I'd like to access it globally. Shouldn't /overall/data work?
Edit 2: Right now I have an index into data that I need to use at anytime when apply templates to the tags inside of body. How do I tell, while in body, that data exists? Sometimes it does, sometimes it doesn't. Can't really control that. :)
870
Try count(.//testdata) > 0.
However if your context node is textdata and you want to test whether it has somenode child or not i would write:
<xsl:if test="somenode">
...
</xsl:if>
But I think that's not what you really want. I think you should read on different techniques of writing XSLT stylesheets (push/pull processing, etc.). When applying these, then such expressions are not usually necessary and stylesheets become simplier.
68
This XSLT:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:template match="text()"/> <!-- for clarity only -->
<xsl:template match="body">
<xsl:if test="following-sibling::data">
<xsl:text>Data occurs</xsl:text>
</xsl:if>
<xsl:if test="not(following-sibling::data)">
<xsl:text>No Data occurs</xsl:text>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
Applied to this sample:
<overall>
<body/>
<state/>
<data/>(the one I want access to
</overall>
Will produce this correct result:
Data occurs
When applied to this sample:
<overall>
<body/>
<state/>
</overall>
Result will be:
No Data occurs
This will work with XSL 1.0 if someone needs...
<xsl:choose>
<xsl:when test="/testdata">node exists</xsl:when>
<xsl:otherwise>node does not exists</xsl:otherwise>
</xsl:choose>
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