javax.faces.component
Class UIForm

java.lang.Object
  javax.faces.component.UIComponent
      javax.faces.component.UIComponentBase
          javax.faces.component.UIForm

All Implemented Interfaces:

java.util.EventListener, NamingContainer, PartialStateHolder, StateHolder, UniqueIdVendor, ComponentSystemEventListener, FacesListener, SystemEventListenerHolder

Direct Known Subclasses:

HtmlForm

public class UIForm
extends UIComponentBase
implements NamingContainer, UniqueIdVendor

UIForm is a UIComponent that represents an input form to be presented to the user, and whose child components represent (among other things) the input fields to be included when the form is submitted.

By default, the rendererType property must be set to "javax.faces.Form". This value can be changed by calling the setRendererType() method.

Field Summary

static java.lang.String	COMPONENT_FAMILY The standard component family for this component.
static java.lang.String	COMPONENT_TYPE The standard component type for this component.

Fields inherited from class javax.faces.component.UIComponent

BEANINFO_KEY, bindings, COMPOSITE_COMPONENT_TYPE_KEY, COMPOSITE_FACET_NAME, CURRENT_COMPONENT, CURRENT_COMPOSITE_COMPONENT, FACETS_KEY, VIEW_LOCATION_KEY

Fields inherited from interface javax.faces.component.NamingContainer

SEPARATOR_CHAR

Constructor Summary

UIForm()
Create a new UIForm instance with default property values.

Method Summary

java.lang.String	createUniqueId(FacesContext context, java.lang.String seed) Generate an identifier for a component.
java.lang.String	getContainerClientId(FacesContext context) Override the UIComponent#getContainerClientId to allow users to disable this form from prepending its clientId to its descendent's clientIds depending on the value of this form's isPrependId() property.
java.lang.String	getFamily() Return the identifier of the component family to which this component belongs.
boolean	isPrependId() The prependId flag.
boolean	isSubmitted() Returns the current value of the submitted property.
void	processDecodes(FacesContext context) Override UIComponent#processDecodes to ensure that the form is decoded before its children.
void	processUpdates(FacesContext context) Override UIComponent#processUpdates to ensure that the children of this UIForm instance are only processed if isSubmitted() returns true.
void	processValidators(FacesContext context) Override UIComponent#processValidators to ensure that the children of this UIForm instance are only processed if isSubmitted() returns true.
void	setPrependId(boolean prependId)
void	setSubmitted(boolean submitted) If this UIForm instance (as opposed to other forms in the page) is experiencing a submit during this request processing lifecycle, this method must be called, with true as the argument, during the UIComponent#decode for this UIForm instance.
boolean	visitTree(VisitContext context, VisitCallback callback) Perform a tree visit starting at this node in the tree.

Methods inherited from class javax.faces.component.UIComponentBase

addClientBehavior, addFacesListener, broadcast, clearInitialState, decode, encodeBegin, encodeChildren, encodeEnd, findComponent, getAttributes, getChildCount, getChildren, getClientBehaviors, getClientId, getDefaultEventName, getEventNames, getFacesContext, getFacesListeners, getFacet, getFacetCount, getFacets, getFacetsAndChildren, getId, getParent, getRenderer, getRendererType, getRendersChildren, getValueBinding, invokeOnComponent, isRendered, isTransient, markInitialState, processRestoreState, processSaveState, queueEvent, removeFacesListener, restoreAttachedState, restoreState, saveAttachedState, saveState, setId, setParent, setRendered, setRendererType, setTransient, setValueBinding

Methods inherited from class javax.faces.component.UIComponent

encodeAll, getClientId, getCompositeComponentParent, getCurrentComponent, getCurrentCompositeComponent, getListenersForEventClass, getNamingContainer, getResourceBundleMap, getStateHelper, getStateHelper, getValueExpression, initialStateMarked, isCompositeComponent, isInView, isVisitable, popComponentFromEL, processEvent, pushComponentToEL, setInView, setValueExpression, subscribeToEvent, unsubscribeFromEvent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

COMPONENT_TYPE

public static final java.lang.String COMPONENT_TYPE

The standard component type for this component.

See Also:

Constant Field Values

COMPONENT_FAMILY

public static final java.lang.String COMPONENT_FAMILY

The standard component family for this component.

See Also:

Constant Field Values

Constructor Detail

UIForm

public UIForm()

Create a new UIForm instance with default property values.

Method Detail

getFamily

public java.lang.String getFamily()

Description copied from class: UIComponent

Return the identifier of the component family to which this component belongs. This identifier, in conjunction with the value of the rendererType property, may be used to select the appropriate Renderer for this component instance.

Specified by:

getFamily in class UIComponent

isSubmitted

public boolean isSubmitted()

Returns the current value of the submitted property. The default value is false. See setSubmitted(boolean) for details.

setSubmitted

public void setSubmitted(boolean submitted)

If this UIForm instance (as opposed to other forms in the page) is experiencing a submit during this request processing lifecycle, this method must be called, with true as the argument, during the UIComponent#decode for this UIForm instance. If this UIForm instance is not experiencing a submit, this method must be called, with false as the argument, during the UIComponent#decode for this UIForm instance.

The value of a UIForm's submitted property must not be saved as part of its state.

isPrependId

public boolean isPrependId()

The prependId flag.

setPrependId

public void setPrependId(boolean prependId)

processDecodes

public void processDecodes(FacesContext context)

Override UIComponent#processDecodes to ensure that the form is decoded before its children. This is necessary to allow the submitted property to be correctly set.

Overrides:

processDecodes in class UIComponentBase

Parameters:

context - FacesContext for the request we are processing

Throws:

java.lang.NullPointerException - if context is null

processValidators

public void processValidators(FacesContext context)

Override UIComponent#processValidators to ensure that the children of this UIForm instance are only processed if isSubmitted() returns true.

Overrides:

processValidators in class UIComponentBase

Parameters:

context - FacesContext for the request we are processing

Throws:

java.lang.NullPointerException - if context is null

processUpdates

public void processUpdates(FacesContext context)

Override UIComponent#processUpdates to ensure that the children of this UIForm instance are only processed if isSubmitted() returns true.

Overrides:

processUpdates in class UIComponentBase

Parameters:

context - FacesContext for the request we are processing

Throws:

java.lang.NullPointerException - if context is null

createUniqueId

public java.lang.String createUniqueId(FacesContext context,
                                       java.lang.String seed)

Description copied from interface: UniqueIdVendor

Generate an identifier for a component. The identifier will be prefixed with UNIQUE_ID_PREFIX, and will be unique within this component-container. Optionally, a unique seed value can be supplied by component creators which should be included in the generated unique id.

Specified by:

createUniqueId in interface UniqueIdVendor

Parameters:

context - FacesContext

seed - an optional seed value - e.g. based on the position of the component in the VDL-template

Returns:

a unique-id in this component-container

getContainerClientId

public java.lang.String getContainerClientId(FacesContext context)

Override the UIComponent#getContainerClientId to allow users to disable this form from prepending its clientId to its descendent's clientIds depending on the value of this form's isPrependId() property.

Overrides:

getContainerClientId in class UIComponent

visitTree

public boolean visitTree(VisitContext context,
                         VisitCallback callback)

Description copied from class: UIComponent

Perform a tree visit starting at this node in the tree.

UIComponent.visitTree() implementations do not invoke the VisitCallback directly, but instead call VisitContext#invokeVisitCallback to invoke the callback. This allows VisitContext implementations to provide optimized tree traversals, for example by only calling the VisitCallback for a subset of components.

UIComponent.visitTree() implementations must call UIComponent.pushComponentToEL() before performing the visit and UIComponent.popComponentFromEL() after the visit.

Overrides:

visitTree in class UIComponent

Parameters:

context - the VisitContext for this visit

callback - the VisitCallback instance whose visit method will be called for each node visited.

Returns:

component implementations may return true to indicate that the tree visit is complete (eg. all components that need to be visited have been visited). This results in the tree visit being short-circuited such that no more components are visited.

See Also:

UIComponent#visitTree