The RequestParameterSelector tests the value of request parameter against the test attribute of the selector's when clause.

The RequestParameterSelector allows to control the sitemap processing depending on a request parameter.

The snippet below uses a RequestParameterSelector named request-parameter. It tests the value of request parameter named command against list, create; finally it has a otherwise clause.

	<map:select type="request-parameter"> <map:parameter name="parameter-name" value="command"/> <map:when test="list"> .... </map:when> <map:when test="create"> ... </map:when> ... <map:otherwise> ... </map:otherwise> </map:select>

The snippet below declares a RequestParameterSelector defining to use the request parameter cmd.

	<map:selectors... <map:selector name="request-parameter" src="org.apache.cocoon.selection.RequestParameterSelector" logger="sitemap.selector.requestparameter"> <parameter-name>command</parameter-name> </map:selectors> ...

The configuration section of RequestParameterSelector specifies the default name of the request parameter, used for testing.

Setting up a RequestParameterSelector includes

• Defining an optional sitemap paramter named request-name, it overrides the parameter-name setting in the configuration section.
• choosing the <map:when> test expressions, and a optional <map:otherwise> clause.

The test attribute of the <map:when> clause shall match the value of the request parameter. If no test value matches, or the request parameter is not defined at all, the <map:otherwise clause is selected.

The RequestParameterSelector has no side effects on the object model, or any sitemap parameters.

28-12-02: initial creation

Copyright (C) 1999-2002 The Apache Software Foundation. All rights reserved.

A general documentation about selectors is available at Matchers and Selectors.