To include a parameter inside an XPath expression

[joanfabre]

 Hi,

Using JRXmlDatSource I've used parameters inside the XPath query string for the whole report without any problem but... Is it possible to include a report parameter inside the XPath expression that comes within the field description?

Example:

 <field name="packetName" class="java.lang.String">
   <fieldDescription><![CDATA[/doc/index/packet[@order=$P{Order}]/name]]></fieldDescription>
</field>

It seem it doesn't work and I'm not sure if I'm doing something wrong or if JRXmlDataSource doesn't accept parameters (or variables) inside such expressions.

If not, maybe I could accomplish the same results using a variable? Is it there any helper function to make an Xpath query to the XML document from the DataSource?

 

Thanks in advance,

 

Code:

<field name="packetName" class="java.lang.String">   <fieldDescription><![CDATA[/doc/index/packet[@order='$P{Order}']/name]]></fieldDescription></field>

[tonynys]

 I have exactly the same need; 

I have a field with an ID and want to use it like this

 

<field name="guarantorName" class="java.lang.String">

<fieldDescription><![CDATA[data/Parties[identifiers/Primary/@Id=$F{guarantor}]/@Name]]></fieldDescription>

</field>

 

I've seen the OrdersReport sample in jasper, where a query string is used in the same way with $P{customerID} and this works.

But inside the xpath expression above, it doesn't work.

 

Any ideas ?

 

Code:

	<field name="guarantorName" class="java.lang.String">		<fieldDescription><![CDATA[ResolvedDirectoryData/Parties[identifiers/Primary/@Id=$F{guarantor}]/@Name]]></fieldDescription>	</field>