Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


How to read a query string with XSL

Posted on 2004-08-09
Medium Priority
Last Modified: 2012-05-07
I need to get a value from a query string and use it in an xsl:if statment.  How is this done.  I am running my app on Apache.
Question by:bzak
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
LVL 26

Expert Comment

ID: 11753831
I'm not sure this is possible directly in the XSLT with XSLT processors that would run on Apache, but here's one way to do it using MSXML:

The "right" way to do it is to pass the query string in server-side as a parameter to the transform.  But this would require some sort of server-side scripting/programming language, which you haven't mentioned.   Here's how I've done it client-side, using IE6:

function getParam(strParam)
      strQueryString = decode(;
      iTerm = strQueryString.indexOf(strParam + "=")
      if (iTerm != -1)
            strSubQuery = strQueryString.substring(iTerm + strParam.length + 1)
            iTermEnd = strSubQuery.indexOf("&")
            if (iTermEnd == -1)
                  iTermEnd = strSubQuery.length
            strSubQuery = strSubQuery.substring(0, iTermEnd)
            strSubQuery = null
      return strSubQuery
// URL Decodes the string
function decode(str) {
     return unescape(str.replace(/\+/g, " "));

Then when calling the transform, you add the parameter to the XSLT like:

xslProc.addParameter("pMyParam", getParam('foo'));

Mike Sharp

Author Comment

ID: 11754000
How do I use:

xslProc.addParameter("pMyParam", getParam('foo'));

in an xsl:if statement?
LVL 26

Expert Comment

ID: 11754222

xslProc.addParameter("pMyParam", getParam('foo'));

sets a parameter in the XSLT like:

<xsl:param name="pMyParam"/>

so that during transformation, the parameter functions as if it was created like:

<xsl:param name="pMyParam">bar</xsl:param>

Which is used like (for example, assuming the querystring was foo=bar):

<xsl:if test="$pMyParam = 'bar'">foo equals bar</xsl:if>

For a complete example of setting parameters during transformation, look at my dynamic filter and sort example:

This sets nodelists as parameters, as well, which has interesting implications.

Mike Sharp
More Than Just A Video Library

Train for your certification. Learn the latest DevOps tools. Grow your skillset to do better work.

At Linux Academy, we release new training modules every week so you'll always be up to date on the latest tech.

LVL 26

Expert Comment

ID: 11754253
In any case, you'll need to use whatever flavor of a template processor you have available to Xalan or whatever.  Just make sure it has the ability to set parameters externally.

Mike Sharp

Author Comment

ID: 11754444
Ok, now for the tricky part....

I am importing two templates into a master....

<?xml version="1.0" encoding="ISO-8859-1"?>

<xsl:stylesheet version="1.0"
<xsl:import href="fpForm_ST.xsl"/>
<xsl:import href="fpTemplate.xsl"/>

The query string variable needs to be read by fpTemplate.xsl.  This does not work.  It only works if I remove the import statement for fpForm.xsl.

Author Comment

ID: 11754943
Actually I was able to get it to work with your example:

<xsl:stylesheet version="1.0" xmlns:xsl=""
  <xsl:output method="html" indent="yes" encoding="iso-8859-1"/>
   <xsl:variable name="xmlpath" select="url:findURL(.)" />
  <xsl:variable name="search">
    <xsl:if test="contains($xmlpath,'?')">
      <xsl:value-of select="substring-after($xmlpath,'?')" />
  <msxsl:script language="JScript" implements-prefix="url">
    function findURL(nodelist)
      return nodelist.nextNode().url;

      <link href="style.css" rel="stylesheet" type="text/css" />
        <xsl:for-each select="planName">
          <xsl:text>The search string is: </xsl:text>
          <xsl:value-of select="$search" />

Bu I am not sure how to cut up the string....
I am getting:

The search string is: test1=Test&test2=test

I want to use the value of test1 in the if statement
LVL 26

Accepted Solution

rdcpro earned 1400 total points
ID: 11755585
This should work:

<xsl:value-of select="substring-before(substring-after($search, 'test1'), '&amp;')"/>

Mike Sharp

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The Problem How to write an Xquery that works like a SQL outer join, providing placeholders for absent data on the outer side?  I give a bit more background at the end. The situation expressed as relational data Let’s work through this.  I’ve …
The Client Need Led Us to RSS I recently had an investment company ask me how they might notify their constituents about their newsworthy publications.  Probably you would think "Facebook" or "Twitter" but this is an interesting client.  Their cons…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : All lightning effects with instructions : http://www.mediaf…
We’ve all felt that sense of false security before—locking down external access to a database or component and feeling like we’ve done all we need to do to secure company data. But that feeling is fleeting. Attacks these days can happen in many w…

671 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question