Using a variable XPath in JSTL xml statements

["Ruth, Brice" <br...@fiskars.com>]

Good evening.

I'm using the JSTL xml statements and I find myself in a situation where 
I want to dynamically determine if the "select" XPath used in an 
<x:forEach> or <x:out> or whatever, is something like:

/country[@name=$country]/section[@name=$section]/category

- OR -

/country[@name=$country]/section

I've tried a great many things, using JSTL tags from the core library to 
put one of those two strings in a page variable and then doing

<x:forEach select="$xml/$xpathPfx">

using scriptlets to assemble the xpath fragment and doing

<x:forEach select="$xml/<%=xpathPfx%>

to practically any number of other things and I always get a 
ServletException stating that the XPath processor expected one of 
'.','..','@', etc.

Is there any way for me to do this?

Thanks!

-- 
Brice D. Ruth
Sr. IT Analyst
Fiskars Brands, Inc.



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Re: Using a variable XPath in JSTL xml statements

["Ruth, Brice" <br...@fiskars.com>]

OK, thanks. That's too bad.

Marius Scurtescu wrote:

> The spec says that the 'select' attribute is not dynamic,
> accepts only a string. It probably does not interpret
> the expressions you put there.
>
> You may have to use some if tags (c:if or x:if) and write
> two versions of your x:forEach.
>
> Marius
>
> Ruth, Brice wrote:
>
>> Good evening.
>>
>> I'm using the JSTL xml statements and I find myself in a situation 
>> where I want to dynamically determine if the "select" XPath used in 
>> an <x:forEach> or <x:out> or whatever, is something like:
>>
>> /country[@name=$country]/section[@name=$section]/category
>>
>> - OR -
>>
>> /country[@name=$country]/section
>>
>> I've tried a great many things, using JSTL tags from the core library 
>> to put one of those two strings in a page variable and then doing
>>
>> <x:forEach select="$xml/$xpathPfx">
>>
>> using scriptlets to assemble the xpath fragment and doing
>>
>> <x:forEach select="$xml/<%=xpathPfx%>
>>
>> to practically any number of other things and I always get a 
>> ServletException stating that the XPath processor expected one of 
>> '.','..','@', etc.
>>
>> Is there any way for me to do this?
>>
>> Thanks!
>>
>
>
>
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> To unsubscribe, e-mail: taglibs-user-unsubscribe@jakarta.apache.org
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>

-- 
Brice D. Ruth
Sr. IT Analyst
Fiskars Brands, Inc.



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Re: Using a variable XPath in JSTL xml statements

[Marius Scurtescu <ma...@lightspeed.ca>]

The spec says that the 'select' attribute is not dynamic,
accepts only a string. It probably does not interpret
the expressions you put there.

You may have to use some if tags (c:if or x:if) and write
two versions of your x:forEach.

Marius

Ruth, Brice wrote:

> Good evening.
> 
> I'm using the JSTL xml statements and I find myself in a situation where 
> I want to dynamically determine if the "select" XPath used in an 
> <x:forEach> or <x:out> or whatever, is something like:
> 
> /country[@name=$country]/section[@name=$section]/category
> 
> - OR -
> 
> /country[@name=$country]/section
> 
> I've tried a great many things, using JSTL tags from the core library to 
> put one of those two strings in a page variable and then doing
> 
> <x:forEach select="$xml/$xpathPfx">
> 
> using scriptlets to assemble the xpath fragment and doing
> 
> <x:forEach select="$xml/<%=xpathPfx%>
> 
> to practically any number of other things and I always get a 
> ServletException stating that the XPath processor expected one of 
> '.','..','@', etc.
> 
> Is there any way for me to do this?
> 
> Thanks!
> 



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