I am having problem passing the javascript variable to XSL. I am not sure exactly how to accomplish it or if it can be accomplished. my JS has a function called getID which gets me id a1234 which I am using to print out the label John. Can someone show me how I can do this.

here is my XSL and XML.

<xsl:for-each select="//child[@id ='a1234']">


<br/>
<xsl:value-of select="label"/>

</xsl:for-each>






<parent id="a5678">
    <child id="a1234">
       <label key="">John</label>
    </child>
    <child id="a1235">
       <label key="">Charles</label>
    </child >
</parent>

try this:

<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
      xmlns:msxsl="urn:schemas-microsoft-com:xslt"
      xmlns:user="http://mycompany.com/mynamespace">

<msxsl:script language="JScript" implements-prefix="user">
   your code and function getID() here
</msxsl:script>

<xsl:template match="/">
   <xsl:value-of select="user:getID(.)"/>
</xsl:template>

</xsl:stylesheet>

If you're calling your XSLT transformation from Javascript and it's the calling program that computes the ID, then declare a stylesheet parameter <xsl:param name="id"/> and refer to it as select="//child[@id=$id]"; you can set the parameter from the calling Javascript code using a method in the API defined by your chosen XSLT processor, typically something like transformer.addParameter("id", "a1234").

Alternatively, if your XSLT processor supports it, you can call Javascript extension functions. In Microsoft's MSXML processor (and also in their .NET processor) you can write these within an <msxsl:script> element as shown in another answer to your post.

On the other hand, you might be thinking in terms of Javascript within the HTML page activated by the user clicking a button or similar. If so, you've got things wrong: the XSLT transformation can never respond directly to user interface events.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference

Is there any way to get this without having to use msxsl? I basically want to just try getting the id using the javascript I have for example. this is my JS in CDATA

function getID(){
var id="a1234";
return id;
}

so I already have it defined I just want to know if there is a way for me to simply add the getID inside my XSLT like this to get the label according to the id

<xsl:for-each select="//child[@id='getID()']">
<br/>
<xsl:value-of select="label"/>

</xsl:for-each>

Calling code in other languages (known as extension functions) depends entirely on the XSLT implementation you are using. Some processors support calls to Javascript, some don't; and those that do might do it in different incompatible ways.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference