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Old November 5th, 2007, 05:44 AM
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Default List of Distinct values using xpath and javascript

Hi,
   How to do the unique grouped values which stored as attribute in the tag using xpath....?

Here is my xml data;

<xml>
    <s:Schema id='RowsetSchema'>
      ....
    </s:Schema>
<rs:data>
    <z:row Region='Asia' City='Coimbatore' Category='AAA' Amt='90'/>
    <z:row Region='Asia' City='Coimbatore' Category='BBB' Amt='91'/>
    <z:row Region='Asia' City='Singapore' Category='AAA' Amt='92'/>
    <z:row Region='Asia' City='Chennai' Category='BBB' Amt='93'/>
</rs:data>
<xml>

Here Im using the xpath in javascript in .Net 2.0 also in VBA;
....
xmlNode = xml.selectNodes("//z:row[not(@Category=preceding-sibling::*/@Category)]/@Category");
....

Seems to be very slow when having huge data. I have tried using "distinct-values", but it's throwing error "Unknown method".

Here I want to get the output as like AAA,BBB,CCC... using xpath in javascript and also for VBA using MSXML2.

Pls help me out to solve this problem...

Thanks in advance:)


viv
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vivek
 
Old November 5th, 2007, 05:58 AM
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Well this would be very slow, because for the nth node it will have to check every attribute of the preceding n-1 nodes.

The reason distinct-values doesn't work is that its a XSLT 2.0 function, and neither Microsoft processor supports XSLT 2.0.

I can't think of a better way of doing this in one line of XPath - sorting the nodes by Category and just looking at the previous node would be quicker I suspect, but that's not as easy as it sounds, due to the preceding-ssibling axis always being original document order.

/- Sam Judson : Wrox Technical Editor -/
 
Old November 5th, 2007, 06:11 AM
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 yes, I know..., but i want the alternate solution(xpath and its functions which supports in .Net 2.0 @client side javascript also for VBA MSXML2)

Thx!

viv
 
Old November 5th, 2007, 06:24 AM
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Like Sam, I can't really offer any easy answer, given that you're stuck with XPath 1.0. The best answer might be to iterate over the sibling elements from Javascript, adding each value to a set of values maintained at the Javascript level.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
 
Old November 5th, 2007, 06:52 AM
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Thx Sam and MhKay!

   Can u help me to write an XSL to iterate instead of using javascript and I'll transform using javascript.

Pls help me!

Thank you!

viv





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