How to Access parameteters (request.getParameter) in JSF

How to Access parameteters in JSF -- request.getParameter()...

you cannot use #{request.getParameter("c"}. Such syntax is not acceptable.

From the Specification:
param—An immutable Map of the request parameters for this request, keyed by
parameter name. Only the first value for each parameter name is included.

So, #{param} are loaded from request Parameters by definition :-)

Just for testing purpose, put somewhere on your page to see what the #{param} contains.

You cannot use the session scope bean, because its properties cannot be initialized with the objects that have the shorter scope.


EXAMPLE 1
You can access your current request's instance in backing bean like :
String paramValue = ((HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("paramName");


OR
EXAMPLE 2
<br /><managed-bean><br /> <managed-bean-name>foo</managed-bean-name><br /> <managed-bean-class>com.company.Foo</managed-bean-class><br /> <managed-bean-scope>request</managed-bean-scope><br /> <managed-property><br /> <property-name>paramA</property-name><br /> <value>#{param.a}</value><br /> </managed-property><br /> <managed-property><br /> <property-name>paramB</property-name><br /> <value>#{param.b}</value><br /> </managed-property><br /> <managed-property><br /> <property-name>paramC</property-name><br /> <value>#{param.c}</value><br /> </managed-property><br /> <managed-property><br /> ......<br /> </managed-property><br /> </managed-bean><br />


OR
EXAMPLE 3
The easiest way to resolve this is to use a commandLink instead of a commandButton. Within your commandLink use f:param to send the subLink1 parameter:
<br /><h:commandLink action="#{linkBean.performSubmit}"><br /><f:param name="subLink1" value="true" /><br /></h:commandLink><br />
Then in faces.config use the managed property and the implicit JSF expression variable "param" to set the parameter in your managed bean. Something like:
<br /><managed-bean><br /><managed-bean-name>linkBean</managed-bean-name><br /><managed-bean-class>com.foo.LinkBean</managed-bean-class><br /><managed-bean-scope>request</managed-bean-scope><br /><managed-property><br /><property-name>subLink1</property-name><br /><value>#{param.subLink1}</value><br /></managed-property><br /></managed-bean><br />
Then add a setter method in your managed bean for subLink1.



<br />lest say if ur passing url as<br />http://localhost:8080/action/myaction.do?selectedIndex=myIndexPage<br />directly call <h:inputText value="#{param.selectedIndex}" /><br />