I am using a variable say xpathvar in the XSLT whose value will be supplied at the time of call to XSLT. How can i achieve this?
My XSLT file looks like -
<xsl:param name="xpathvar"/>
<xsl:param name="keyxpath"/>
<xsl:template match="/">
<listofResults>
<xsl:for-each select="$xpathvar">
<keyvalues><xsl:value-of select="xalan:evaluate(substring-before($keyxpath,'||'))"/></keyvalues>
<keyvalues><xsl:value-of select="xalan:evaluate(substring-after($keyxpath,'||'))"/></keyvalues>
</xsl:for-each>
</listofResults>
</xsl:template>
</xsl:stylesheet>
If I mention the variable in the for-each, it throws error. Please guide how can I achieve this.
Thanks!
According to Global xsl:param containing xpath expression string it can't be done purely with plain old XSLT, you need to use the evaluate extension see: Xalan evaluate expression
I dont think this can be done like this you must use xpath so example would be
<template match="Node[name=$xpathvar]" />
<xsl:for-each select="*[name()=$xpathvar]">
</xsl:for-each>
I think it does not let you use the variable directly because it is not a nodeset.
If I mention the variable in the
for-each, it throws error
In XSLT 1.0 (it looks you are using Xalan), you can iterate over node sets, only. So $xpathvar should be an instance of node set data type.
In XSLT 2.0 you can iterate over sequence (including scalar values).
Also, if the string containing the "dynamic" XPath expression is simple enough (only QName test step, maybe positional predicates) this could be done (as is already answered in SO) with standar XSLT.
Related
I have faced an issue when using a variable as a condition for XPath evaluation. I have the following template which works fine:
<xsl:template name="typeReasonDic">
<xsl:variable name="dic" select="$schema//xs:simpleType[#name = 'type_reason_et']"/>
<!-- do something with the variable -->
</xsl:template>
However, when I change it to look like this:
<xsl:template name="typeReasonDic">
<xsl:param name="choose_dic" select="#name = 'type_reason_et'"/>
<xsl:variable name="dic" select="$schema//xs:simpleType[$choose_dic]"/>
<!-- do something with the variable -->
</xsl:template>
it fails to find the desired node.
What I wish to get is a template with a default value for $choose_dic which can be overriden where necessary.
What am I missing here?
UPD: there is this link I found with the description of what I'm trying to do, but it doesn't seem to work for me.
You can't do this directly in XSLT 1.0 or 2.0 without an extension function. The problem is that with
<xsl:template name="typeReasonDic">
<xsl:param name="choose_dic" select="#name = 'type_reason_et'"/>
<xsl:variable name="dic" select="$schema//xs:simpleType[$choose_dic]"/>
<!-- do something with the variable -->
</xsl:template>
the <xsl:param> will evaluate its select expression a single time in the current context and store the true/false result of this evaluation in the $choose_dic variable. The <xsl:variable> will therefore select either all xs:simpleType elements under the $schema (if $choose_dic is true) or none of them (if $choose_dic) is false. This is very different from
<xsl:variable name="dic" select="$schema//xs:simpleType[#name = 'type_reason_et']"/>
which will evaluate #name = 'type_reason_et' repeatedly, in the context of each xsl:simpleType, and select those elements for which the expression evaluated to true.
If you store the XPath expression as a string you can use an extension function such as dyn:evaluate or the XSLT 3.0 xsl:evaluate element if you're using Saxon.
By doing
<xsl:param name="choose_dic" select="#name = 'type_reason_et'"/>
the XSL engine will try to evaluate "#name = 'type_reason_et'" as an XPath expression, and will assign the RESULT to your variable.
You should use the following variable declaration instead:
<xsl:param name="choose_dic">#name = 'type_reason_et'</xsl:param>
This is the default value, but you can override it when you call your template by using xsl:with-param.
XSLT is not a macro language where you might be able to concatenate your code at run-time from strings and then evaluate them dynamically. So in general for your purpose you would need an extension function to evaluate an XPath expression stored in a string or you need to look into a new XSLT 3.0 features like http://www.saxonica.com/documentation/xsl-elements/evaluate.xml.
What is possible in the scope of XSLT 1.0 or 2.0 is doing e.g.
<xsl:param name="p1" select="'foo'"/>
<xsl:variable name="v1" select="//bar[#att = $p1]"/>
where the param holds a value you compare to other value, for instance those in a node like an attribute or element node.
As I have mentioned in this post:
dynamic multiple filters in xsl
Basically, I want to apply multiple filters to my xml using "for loop" and these filters are dynamic which are coming from some other xml
sth like this:
foreach(list/field[#ProgramCategory=$Country][not(contain(#Program,$State1][not(contain(#Program,$State2][not(contain(#Program,$State3][not(contain(#Program,$Staten])
The problem is that I can get n no. of states which I am getting through for loop of other xml.
I cannot use document() function as suggested by Dimitre so I was thinking of achieving it by:
<xsl:variable name="allprograms">
<xsl:for-each select="/list2/field2">
<xsl:text disable-output-escaping="yes">[not(contains(#Program,'</xsl:text><xsl:value-of select="#ProgramID"></xsl:value-of><xsl:text disable-output-escaping="yes">'))]</xsl:text>
</xsl:for-each>
</xsl:variable>
gives me something like this:
[not(contains(#Program,'Virginia'))][not(contains(#Program,'Texas'))][not(contains(#Program,'Florida'))]
I want to use this above value as a filter in the for loop below and I am not sure how to achieve that
<xsl:for-each="list/field[not(contains(#Program,'Virginia'))][not(contains(#Program,'Texas'))][not(contains(#Program,'Florida'))]">
Before this I also have a for loop to filter United States
xsl:for-each="list/field $allprograms">
<xsl:value-of select="#ows_ID" />
</xsl:for-each>
I want my answer to be 1082, 1088..
I can add the xml here too if there is any confusion..
Jack,
From the previous solution you just need to add to this:
<xsl:param name="pFilteredStates">
<state>Virginia</state>
<state>Texas</state>
<state>Florida</state>
</xsl:param>
the following (changing the current variable definition that relies on the document() function):
<xsl:variable name="vFiltered" select=
"ext:node-set($pFilteredStates)/*
"/>
Where the "ext:" prefix needs to be bound to this namespace (this is the EXSLT namespace -- if your XSLT processor doesn't implement exslt:node-set() then you need to find what xxx:node-set() extension it implements, or tell us what is your XSLT processor and people will provide this information):
"http://exslt.org/common"
So, your <xsl:stylesheet> may look like the following:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ext="http://exslt.org/common" exclude-result-prefixes="ext">
I still recommend that the $pFilteredStates parameter should be passed by the initiator of the transformation -- in which case you can delete the definition of $vFiltered and replace every reference to it with $pFilteredStates` and the transformation should work OK.
<xsl:variable name="filterValue"
>#subject = 'Subject To Filter On'</xsl:variable>
<xsl:for-each select="$Rows[$filterValue]">
It seems to me that the $filterValue is being treated as a literal string rather than being evaluated. How can I make it so that the variable's value is evaluated instead?
Desired result:
<xsl:for-each select="$Rows[#subject = 'Subject To Filter On']">
I apologize if this has been answered before, I don't know much terminology about XSL so I'm having trouble searching online. Thanks.
Dynamic evaluation of XPath expressions is not supported in both XSLT 1.0 and XSLT 2.0.
Usually, there are workarounds.
In this specific case you can have (global/external) parameters:
<xsl:param name="attrName" select="'subject'"/>
<xsl:param name="attrValue" select="'Subject To Filter On'"/>
and then in your code:
<xsl:for-each select="$Rows[#*[name()=$attrName] = $attrValue]">
Can anybody who has worked with XSLT help me on this?
I am using XSL version 1.0.
I have declared a parameter in XSL file like:
<xsl:param name="HDISageHelpPath"/>
Now I am assigning the value to this parameter from an asp page . The value which I assign is "document('../ChannelData/Sage/help/ic/xml/HDI.xml')/HelpFiles/Help". Now I want to assign this parameter to the <xsl for each> like
<xsl:for-each select="msxsl:node-set($HDISageHelpPath)" > (This does not work)
But it does not work. I checked the parameter value by debugging it as below
<debug tree="$HDISageHelpPath">
<xsl:copy-of select="$HDISageHelpPath"/>
</debug>
I'm able to print the value and it seems correct. In fact when I assign the static path ("document('../ChannelData/Sage/help/ic/xml/HDI.xml')/HelpFiles/Help") by hard-coding it, it works
<xsl:for-each select="document('../ChannelData/Sage/help/ic/xml/HDI.xml')/HelpFiles/Help"> (This works)
Can anyone please let me know why assigning the parameter to xsl:for-each does not work?
Note: I have referred the site "http://www.dpawson.co.uk/xsl/sect2/N1553.html"
You can't easily evaluate dynamic strings as XPath expressions in XSLT 1.0. They must be hard-coded, normally.
There's EXSLT's dyn:evaluate(), but I doubt you can use that with the MXSML processor.
As an alternative approach, you could either try passing the file path only:
<xsl:param name="HDISageHelpFilePath"/>
<!-- ... -->
<xsl:for-each select="document($HDISageHelpFilePath)/HelpFiles/Help">
</xsl:for-each>
or making placeholder, replacing it with search-and-replace before you load the actual XSL code into the processor (as a string). This is a bit messy and error-prone, but it could give you the possibility to use an actual dynamic XPath expression.
<xsl:for-each select="%HELP_FILE_XPATH%">
</xsl:for-each>
Load the file as text, replace %HELP_FILE_XPATH% with your actual XPath, feed it to the processor. If it loads, you are fine, if it doesn't, your input XPath was malformed.
I've read with interest the techniques available on the web to extract a unique list of items from a XML file containing duplicates using XSL.
These range into 2 categories:
1) The Muenchian method (example: http://www.jenitennison.com/xslt/grouping/)
2) Or the previous-sibling look-up
These both rely on an XPath expression to select the data to group by.
However, in the XML file that I'm trying to work out, the data is not present "natively" in the XML file. I am using a xsl:template to compute some aggregated data from my elements. And I would like to group based on the aggregated data.
For example I have:
<filmsreview>
<record><data name='movie'>Star Wars</data><data name='ratings'>John:Good, Mary:Good</data></record>
<record><data name='movie'>Indiana Jones</data><data name='ratings'>John:Good, Mary:Bad, Helen:Average</data></record>
<record><data name='movie'>Titanic</data><data name='ratings'>John:Bad, Helen:Good</data></record>
</filmsreview>
I know that the structuration of data is not perfect and that by creating sub-elements I could do something easier, but I cannot change the data source easily, so let's take this as a challenge.
And I would like to build a recap where I have John's distinct ratings:
John's ratings:
Good
Bad
I have a xsl:template that can take a record element and return John's rating for this record:
Example:
<xsl:template name="get_rating">
<xsl:param name="reviewer" />
<!-- I use some string manipulation, and xsl:value-of to return the review for John-->
</xsl:template>
I can just call it under a xsl:for-each to get the exhaustive list of John's review. But I cannot combine this call with any of the methods to get unique values.
Do I have to use an intermediary XSL to convert my XML file to a more structured way? Or can I do in a single step?
Many thanks
Gerard
Hmm... This should be possible using xslt variables and the nodeset method, perhaps something like this:
<xsl:variable name="_johnsRatings">
<xsl:apply-templates select="/" mode="johnsRatings" />
</xsl:variable>
<xsl:variable name="johnsRatings" select="msxsl:node-set($_johnsRatings)" />
<xsl:template match="/" mode="johnsRatings">
<Ratings>
<xsl:for-each select="/filmsReview/record/data[#name='ratings']">
<Rating><xsl:call-template name="get_rating" /></Rating>
</xsl:for-each>
</Ratings>
</xsl:template>
At this point, it should be possible to query the $johnsRatings variable using standard XPath queries, and you can use either of the two methods you mentioned above to retrieve unique values from it...
Hope that helps
EDIT:
I don't know what XSLT engine you are using, I assumed you have access to the msxsl:node-set() function. However, most XSLT processors have similar methods, so you might have to search around for an equivalent method in your processor