UI-Component Sets
Project Documentation


Tag name: <f:viewParam>
UIComponent class: javax.faces.component.UIViewParameter
Tag class: org.apache.myfaces.taglib.core.ViewParamTag
Component type: javax.faces.ViewParameter
Component family: javax.faces.ViewParameter
Renderer type: javax.faces.Text

TODO: documentation on jsp and pld are not the same. It appear two params: maxlength and for, but no property getter and setter founded here. If maxlength is used, we can put something like this: JSFJspProperty(name = "maxlength", returnType = "java.lang.String")

Supported Listeners

Name Listener Event Phases Required Description


Name Type Supports EL? Description
binding javax.faces.component.UIViewParameter Only EL Identifies a backing bean property (of type UIComponent or appropriate subclass) to bind " + "to this component instance. This value must be an EL expression.
converter javax.faces.convert.Converter Yes An expression that specifies the Converter for this component.

The value can either be a static value (ID) or an EL expression. When a static id is specified, an instance of the converter type registered with that id is used. When this is an EL expression, the result of evaluating the expression must be an object that implements the Converter interface.

converterMessage String Yes Text to be displayed to the user as an error message when conversion of a submitted value to the target type fails.

id String Yes Get a string which uniquely identifies this UIComponent within the scope of the nearest ancestor NamingContainer component. The id is not necessarily unique across all components in the current view.
maxlength int Yes The max number or characters allowed for this param
required boolean Yes A boolean value that indicates whether an input value is required.

If this value is true and no input value is provided by a postback operation, then the "requiredMessage" text is registered as a FacesMessage for the request, and validation fails.

Default value: false.

requiredMessage String Yes Text to be displayed to the user as an error message when this component is marked as "required" but no input data is present during a postback (ie the user left the required field blank).
validator javax.faces.el.MethodBinding Only EL A method-binding EL expression which is invoked during the validation phase for this component.

The invoked method is expected to check the submitted value for this component, and if not acceptable then report a validation error for the component.

The method is expected to have the prototype

public void aMethod(FacesContext, UIComponent,Object)
validatorMessage String Yes Text which will be shown if validation fails.
value Object Yes Gets The initial value of this component.
valueChangeListener javax.faces.el.MethodBinding Only EL A method which is invoked during postback processing for the current view if the submitted value for this component is not equal to the value which the "value" expression for this component returns.

The phase in which this method is invoked can be controlled via the immediate attribute.