public class

FileUpload

extends Widget
implements HasChangeHandlers HasName

java.lang.Object
↳	com.google.gwt.user.client.ui.UIObject
	↳	com.google.gwt.user.client.ui.Widget
		↳	com.google.gwt.user.client.ui.FileUpload

Class Overview

A widget that wraps the HTML <input type='file'> element. This widget must be used with FormPanel if it is to be submitted to a server.

Example

{@example com.google.gwt.examples.FormPanelExample}

Summary

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Inherited Constants

From class com.google.gwt.user.client.ui.UIObject

Public Constructors
	FileUpload() Constructs a new file upload widget.

Protected Constructors
	FileUpload(Element element) This constructor may be used by subclasses to explicitly use an existing element.

Public Methods
HandlerRegistration	addChangeHandler(ChangeHandler handler) Adds a `ChangeEvent` handler.
String	getFilename() Gets the filename selected by the user.
String	getName() Gets the widget's name.
boolean	isEnabled() Gets whether this widget is enabled.
void	onBrowserEvent(Event event) Fired whenever a browser event is received.
void	setEnabled(boolean enabled) Sets whether this widget is enabled.
void	setName(String name) Sets the widget's name.
static FileUpload	wrap(Element element) Creates a FileUpload widget that wraps an existing <input type='file'> element.

[Expand]

Inherited Methods

From class com.google.gwt.user.client.ui.Widget

HandlerRegistration	addAttachHandler(AttachEvent.Handler handler) Adds an `AttachEvent` handler.
final <H extends EventHandler> HandlerRegistration	addDomHandler(H handler, Type<H> type) Adds a native event handler to the widget and sinks the corresponding native event.
final <H extends EventHandler> HandlerRegistration	addHandler(H handler, Type<H> type) Adds this handler to the widget.
Widget	asWidget() Returns the `Widget` aspect of the receiver.
static Widget	asWidgetOrNull(IsWidget w) This convenience method makes a null-safe call to `asWidget()`.
HandlerManager	createHandlerManager() Creates the `HandlerManager` used by this Widget.
void	delegateEvent(Widget target, GwtEvent<?> event) Fires an event on a child widget.
void	doAttachChildren() If a widget contains one or more child widgets that are not in the logical widget hierarchy (the child is physically connected only on the DOM level), it must override this method and call `onAttach()` for each of its child widgets.
void	doDetachChildren() If a widget contains one or more child widgets that are not in the logical widget hierarchy (the child is physically connected only on the DOM level), it must override this method and call `onDetach()` for each of its child widgets.
void	fireEvent(GwtEvent<?> event) Fires the given event to the handlers listening to the event's type.
int	getHandlerCount(Type<?> type) Gets the number of handlers listening to the event type.
Object	getLayoutData() Gets the panel-defined layout data associated with this widget.
Widget	getParent() Gets this widget's parent panel.
boolean	isAttached() Determines whether this widget is currently attached to the browser's document (i.e., there is an unbroken chain of widgets between this widget and the underlying browser document).
final boolean	isOrWasAttached() Has this widget ever been attached?
void	onAttach() This method is called when a widget is attached to the browser's document.
void	onBrowserEvent(Event event) Fired whenever a browser event is received.
void	onDetach() This method is called when a widget is detached from the browser's document.
void	onLoad() This method is called immediately after a widget becomes attached to the browser's document.
void	onUnload() This method is called immediately before a widget will be detached from the browser's document.
void	removeFromParent() Removes this widget from its parent widget, if one exists.
void	setLayoutData(Object layoutData) Sets the panel-defined layout data associated with this widget.
void	sinkEvents(int eventBitsToAdd) Overridden to defer the call to super.sinkEvents until the first time this widget is attached to the dom, as a performance enhancement.

From class com.google.gwt.user.client.ui.UIObject

void	addStyleDependentName(String styleSuffix) Adds a dependent style name by specifying the style name's suffix.
void	addStyleName(String style) Adds a secondary or dependent style name to this object.
static void	ensureDebugId(Element elem, String baseID, String id) Set the debug id of a specific element.
final void	ensureDebugId(String id) Ensure that the main `Element` for this `UIObject` has an ID property set, which allows it to integrate with third-party libraries and test tools.
static void	ensureDebugId(Element elem, String id) Ensure that elem has an ID property set, which allows it to integrate with third-party libraries and test tools.
int	getAbsoluteLeft() Gets the object's absolute left position in pixels, as measured from the browser window's client area.
int	getAbsoluteTop() Gets the object's absolute top position in pixels, as measured from the browser window's client area.
Element	getElement() Gets a handle to the object's underlying DOM element.
int	getOffsetHeight() Gets the object's offset height in pixels.
int	getOffsetWidth() Gets the object's offset width in pixels.
Element	getStyleElement() Template method that returns the element to which style names will be applied.
String	getStyleName() Gets all of the object's style names, as a space-separated list.
static String	getStyleName(Element elem) Gets all of the element's style names, as a space-separated list.
String	getStylePrimaryName() Gets the primary style name associated with the object.
static String	getStylePrimaryName(Element elem) Gets the element's primary style name.
String	getTitle() Gets the title associated with this object.
boolean	isVisible() Determines whether or not this object is visible.
static boolean	isVisible(Element elem)
void	onEnsureDebugId(String baseID) Called when the user sets the id using the `ensureDebugId(String)` method.
void	removeStyleDependentName(String styleSuffix) Removes a dependent style name by specifying the style name's suffix.
void	removeStyleName(String style) Removes a style name.
final void	setElement(Element elem) Sets this object's browser element.
void	setElement(Element elem) Sets this object's browser element.
void	setHeight(String height) Sets the object's height.
void	setPixelSize(int width, int height) Sets the object's size, in pixels, not including decorations such as border, margin, and padding.
void	setSize(String width, String height) Sets the object's size.
void	setStyleDependentName(String styleSuffix, boolean add) Adds or removes a dependent style name by specifying the style name's suffix.
static void	setStyleName(Element elem, String styleName) Clears all of the element's style names and sets it to the given style.
static void	setStyleName(Element elem, String style, boolean add) This convenience method adds or removes a style name for a given element.
void	setStyleName(String style) Clears all of the object's style names and sets it to the given style.
void	setStyleName(String style, boolean add) Adds or removes a style name.
void	setStylePrimaryName(String style) Sets the object's primary style name and updates all dependent style names.
static void	setStylePrimaryName(Element elem, String style) Sets the element's primary style name and updates all dependent style names.
void	setTitle(String title) Sets the title associated with this object.
void	setVisible(boolean visible) Sets whether this object is visible.
static void	setVisible(Element elem, boolean visible)
void	setWidth(String width) Sets the object's width.
void	sinkEvents(int eventBitsToAdd) Adds a set of events to be sunk by this object.
String	toString() This method is overridden so that any object can be viewed in the debugger as an HTML snippet.
void	unsinkEvents(int eventBitsToRemove) Removes a set of events from this object's event list.

From class java.lang.Object

From interface com.google.gwt.event.dom.client.HasChangeHandlers

From interface com.google.gwt.event.logical.shared.HasAttachHandlers

From interface com.google.gwt.event.shared.HasHandlers

From interface com.google.gwt.user.client.EventListener

From interface com.google.gwt.user.client.ui.HasName

From interface com.google.gwt.user.client.ui.IsWidget

Public Constructors

public FileUpload ()

Constructs a new file upload widget.

Protected Constructors

protected FileUpload (Element element)

This constructor may be used by subclasses to explicitly use an existing element. This element must be an <input> element whose type is 'file'.

Parameters

element	the element to be used

Public Methods

public HandlerRegistration addChangeHandler (ChangeHandler handler)

Adds a ChangeEvent handler.

Parameters

handler	the change handler

Returns

HandlerRegistration used to remove this handler

public String getFilename ()

Gets the filename selected by the user. This property has no mutator, as browser security restrictions preclude setting it.

Returns

the widget's filename

public String getName ()

Gets the widget's name.

Returns

the widget's name

public boolean isEnabled ()

Gets whether this widget is enabled.

Returns

true if the widget is enabled

public void onBrowserEvent (Event event)

Fired whenever a browser event is received.

Parameters

event	the event received

public void setEnabled (boolean enabled)

Sets whether this widget is enabled.

Parameters

enabled	`true` to enable the widget, `false` to disable it

public void setName (String name)

Sets the widget's name.

Parameters

name	the widget's new name

public static FileUpload wrap (Element element)

Creates a FileUpload widget that wraps an existing <input type='file'> element. This element must already be attached to the document. If the element is removed from the document, you must call detachNow(Widget).

Parameters

element	the element to be wrapped

Interfaces

Classes

Annotations

Enums

Exceptions

FileUpload

Class Overview

Example

Summary

Public Constructors

public FileUpload ()

Protected Constructors

protected FileUpload (Element element)

Parameters

Public Methods

public HandlerRegistration addChangeHandler (ChangeHandler handler)

Parameters

Returns

public String getFilename ()

Returns

public String getName ()

Returns

public boolean isEnabled ()

Returns

public void onBrowserEvent (Event event)

Parameters

public void setEnabled (boolean enabled)

Parameters

public void setName (String name)

Parameters

public static FileUpload wrap (Element element)

Parameters