Re: xsl filter problem

Yuval wrote:
> My xml looks like this :
> 
> <customers>
> 	<customer>
> 		<city>a</city>
> 		<name>Jhon<name>
> 	</customer>
> 	<customer>
> 		<city>b</city>
> 		<name>Don<name>
> 	</customer>
> 	<customer>
> 		<city>c</city>
> 		<name>Ron<name>
> 	</customer>
> </customers>
> 
> The data is to presented in a table and I want to filter it according to
> the "city" - meaning I have 4 options :
> 1.a
> 2.b
> 3.c
> 4.all the cities = no filter
> 
> Im using a html select box to let the user choose which city to filter
> and the first option is "all cities".for this parameter I give the value
> *.
> 
> The xsl looks like this :
> 
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> version="1.0">
> 	<xsl:output method="xml" encoding="windows-1255" />
> 	
> 	<xsl:param name="city"  />
> 		
> 	<xsl:template match="/">
> 		<customers>		
> 			<xsl:for-each
> select="customers/customer[city=$city]">
> 				<customer>
> 					<xsl:for-each select="*">
> 						<xsl:element
> name='{name()}'>
> 							<xsl:value-of
> select="." />
> 						</xsl:element>
> 					</xsl:for-each>
> 				</customer>
> 			</xsl:for-each>
> 		
> 		</customers>
> 	</xsl:template>
> </xsl:stylesheet>
> 
> When choosing "all cities" - the result is an empty table instead of the
> list of all cities with the customers names.
> I tried to giva the param "city" a diect value of "*" or " '*' " and it
> still didn't work.
> How can I pass a value to this param which will act like : <xsl:for-each
> select="customers/customer[city=*]"> ??

Don't forget to quote the *.

It looks to me like your conditions are as follows:

If $city = '*', you want all customer elements.
If $city != '*', you want all customer elements for which child::city = $city.

Rephrase this into a test for each customer element:

You want all customer elements for which:
  $city = '*' is true
  or
  child::city = $city

The answer, unless I've overlooked something, is:

customers/customer[$city='*' or city=$city]

Another option is to let $city be an empty string to indicate "all cities".
Then you'd use:

customers/customer[not($city) or city=$city]

Also note that instead of <xsl:element name="{name()}">...</xsl:element>
you can use <xsl:copy>...</xsl:copy>.

Mike

-- 
  Mike J. Brown   |  http://skew.org/~mike/resume/
  Denver, CO, USA |  http://skew.org/xml/


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