Binding Component Value to an Implicit Object

JSF provides list of implicit objects. These objects can be referred in value attribute of component in the JSP page.

Binding Component Value to an Implicit Object

JSF provides list of implicit objects. These objects can be referred in value attribute of component in the JSP page.

Implicit Object	Description
applicationScope	Represents a Map of application scope attribute values with attribute names as keys
cookie	Represents a Map of cookie values for the current request with cookie names as keys
facesContext	Represents the FacesContext instance for the current request
header	Represents a Map of HTTP header values for the current request with header names as keys
headerValues	Represents a `Map` of `String` arrays containing all the header values for HTTP headers in the current request with header names as keys
initParam	Represents a `Map` of the context initialization parameters
param	Represents a `Map` of the request parameters for this request with parameter names as keys
paramValues	Represents a `Map` of `String` arrays containing all the parameter values for request parameters in the current request with parameter names as keys
requestScope	Represents a `Map` of the request attributes for this request with attribute names as keys
sessionScope	Represents a `Map` of the session attributes for this request with attribute names as keys
view	Represents The root `UIComponent` in the current component tree stored in the `FacesRequest` for this request

For example:

Session Scoped parameter can be accessed as below:

<h:outputFormat value="Session Scope Value Is: {0}" rendered="#{!(sessionScope.username==null)}">
<f:param value="#{sessionScope.username}"/>
</h:outputFormat>

Request Scoped parameter can be accessed as below:

<h:outputFormat value="Request Scope Value Is: {0}" rendered="#{!(requestScope.value==null)}">
<f:param value="#{requestScope.value}"/>
</h:outputFormat>

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