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## com.google.gwt.user.client.ui
Class Accessibility

    java.lang.Object
      com.google.gwt.user.client.ui.Accessibility

    public final class Accessibility

extends java.lang.Object

Allows ARIA attributes to be added to widgets so that they can be identified by assistive technologies. Firefox 3, Firefox 2 (via FireVox), and Opera 9.5 are the only released browsers that currently support this feature, but in the near future it will be available in Safari and Internet Explorer 8. Individual screen reader applications may also support ARIA, to varying extents.

A 'role' describes the role a widget plays in a page: i.e. a checkbox widget is assigned a "checkbox" role.

A 'state' describes the current state of the widget. For example, a checkbox widget has the state "checked", which is given a value of "true" or "false" depending on whether it is currently checked or unchecked.

See the MDC page on Accessible DHTML for more information.

Note that although this API is public, the ARIA specification is still somewhat in flux. As a result, this API is subject to change as the specification stabilizes; we will do our best to keep the community updated on changes.

Field Summary
`static java.lang.String` | `ROLE_BUTTON`
`static java.lang.String` | `ROLE_MENUBAR`
`static java.lang.String` | `ROLE_MENUITEM`
`static java.lang.String` | `ROLE_TAB`
`static java.lang.String` | `ROLE_TABLIST`
`static java.lang.String` | `ROLE_TABPANEL`
`static java.lang.String` | `ROLE_TREE`
`static java.lang.String` | `ROLE_TREEITEM`
`static java.lang.String` | `STATE_ACTIVEDESCENDANT`
`static java.lang.String` | `STATE_EXPANDED`
`static java.lang.String` | `STATE_HASPOPUP`
`static java.lang.String` | `STATE_LEVEL`
`static java.lang.String` | `STATE_POSINSET`
`static java.lang.String` | `STATE_PRESSED`
`static java.lang.String` | `STATE_SELECTED`
`static java.lang.String` | `STATE_SETSIZE`

Method Summary
`static java.lang.String` | `getRole(Element elem)` Requests the string value of the role with the specified namespace.
`static java.lang.String` | `getState(Element elem, java.lang.String stateName)` Requests the string value of the state with the specified namespace.
`static void` | `removeState(Element elem, java.lang.String stateName)` Removes the state from the given element.
`static void` | `setRole(Element elem, java.lang.String roleName)` Assigns the specified element the specified role and value for that role.
`static void` | `setState(Element elem, java.lang.String stateName, java.lang.String stateValue)` Assigns the specified element the specified state and value for that state.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### ROLE_TREE

    public static final java.lang.String ROLE_TREE

See Also:
  Constant Field Values

### ROLE_TREEITEM

    public static final java.lang.String ROLE_TREEITEM

See Also:
  Constant Field Values

### ROLE_BUTTON

    public static final java.lang.String ROLE_BUTTON

See Also:
  Constant Field Values

### ROLE_TABLIST

    public static final java.lang.String ROLE_TABLIST

See Also:
  Constant Field Values

### ROLE_TAB

    public static final java.lang.String ROLE_TAB

See Also:
  Constant Field Values

### ROLE_TABPANEL

    public static final java.lang.String ROLE_TABPANEL

See Also:
  Constant Field Values

### ROLE_MENUBAR

    public static final java.lang.String ROLE_MENUBAR

See Also:
  Constant Field Values

### ROLE_MENUITEM

    public static final java.lang.String ROLE_MENUITEM

See Also:
  Constant Field Values

### STATE_ACTIVEDESCENDANT

    public static final java.lang.String STATE_ACTIVEDESCENDANT

See Also:
  Constant Field Values

### STATE_POSINSET

    public static final java.lang.String STATE_POSINSET

See Also:
  Constant Field Values

### STATE_SETSIZE

    public static final java.lang.String STATE_SETSIZE

See Also:
  Constant Field Values

### STATE_SELECTED

    public static final java.lang.String STATE_SELECTED

See Also:
  Constant Field Values

### STATE_EXPANDED

    public static final java.lang.String STATE_EXPANDED

See Also:
  Constant Field Values

### STATE_LEVEL

    public static final java.lang.String STATE_LEVEL

See Also:
  Constant Field Values

### STATE_HASPOPUP

    public static final java.lang.String STATE_HASPOPUP

See Also:
  Constant Field Values

### STATE_PRESSED

    public static final java.lang.String STATE_PRESSED

See Also:
  Constant Field Values

Method Detail

### getRole

    public static java.lang.String getRole(Element elem)

  Requests the string value of the role with the specified namespace.

  Parameters:
    `elem` - the element which has the specified role
  Returns:
    the value of the role, or an empty string if none exists

### getState

    public static java.lang.String getState(Element elem,
                                            java.lang.String stateName)

  Requests the string value of the state with the specified namespace.

  Parameters:
    `elem` - the element which has the specified state
    `stateName` - the name of the state
  Returns:
    the value of the state, or an empty string if none exists

### removeState

    public static void removeState(Element elem,
                                   java.lang.String stateName)

  Removes the state from the given element.

  Parameters:
    `elem` - the element which has the specified state
    `stateName` - the name of the state to remove

### setRole

    public static void setRole(Element elem,
                               java.lang.String roleName)

  Assigns the specified element the specified role and value for that role.

  Parameters:
    `elem` - the element to be given the specified role
    `roleName` - the name of the role

### setState

    public static void setState(Element elem,
                                java.lang.String stateName,
                                java.lang.String stateValue)

  Assigns the specified element the specified state and value for that state.

  Parameters:
    `elem` - the element to be given the specified state
    `stateName` - the name of the state
    `stateValue` - the value of the state

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