A group of radio buttons. Only one radio button inside the group can be selected at a time. The radio
buttons may either direct children of the radiogroup
or descendants. Place the radiogroup
inside a groupbox
if you would like a border or caption
for the group. The radiogroup
defaults to vertical orientation.
More information is available in the XUL tutorial.
- Attributes
- disabled, focused, preference, tabindex, value
- Properties
- accessibleType, disabled, focusedItem, itemCount, selectedIndex, selectedItem, tabIndex, value
- Methods
- appendItem, checkAdjacentElement, getIndexOfItem, getItemAtIndex, insertItemAt, removeItemAt
Examples
<radiogroup> <radio id="orange" label="Red"/> <radio id="violet" label="Green" selected="true"/> <radio id="yellow" label="Blue"/> </radiogroup>
Attributes
-
disabled
- Type: boolean
-
Indicates whether the element is disabled or not. If this element is set to
true
the element is disabled. Disabled elements are usually drawn with grayed-out text. If the element is disabled, it does not respond to user actions, it cannot be focused, and thecommand
event will not fire. -
Visible controls have a
disabled
property which, except for menus and menuitems, is normally preferred to use of the attribute, as it may need to update additional state.
-
focused
- Type: boolean
- This attribute is
true
if the element is focused.
preference
- Type: id
- Connects the element to a corresponding
preference
. This attribute only has any effect when used inside aprefwindow
. More information is available in the Preferences System article.
-
tabindex
- Type: integer
- The tab order of the element. The tab order is the order in which the focus is moved when the user presses the "
tab
" key. Elements with a highertabindex
are later in the tab sequence.
-
value
- Type: string
-
The string attribute allows you to associate a data value with an element. It is not used for any specific purpose, but you can access it with a script for your own use. Be aware, however, that some elements, such as textbox will display the value visually, so in order to merely associate data with an element, you could 1) Use another attribute like "value2" or "data-myAtt" (as in the HTML5 draft), as XUL does not require validation (less future-proof); 2) Use setAttributeNS() to put custom attributes in a non-XUL namespace (serializable and future-proof); 3) Use setUserData() (future-proof and clean, but not easily serializable). For user editable
menulist
elements, the contents, as visible to the user, are read and set using the Menulist.value syntax. For those elements, setAttribute("value", myValue) and getAttribute("value") do not access or affect the contents displayed to the user.
Properties
-
accessibleType
- Type: integer
- A value indicating the type of accessibility object for the element.
-
focusedItem
- Type:
radio
element - Holds the currently focused item in the
radiogroup
, which may or may not be the same as the selected item. You can change the focused item by setting this property.
itemCount
- Type: integer
- Read only property holding the number of child items.
-
selectedIndex
- Type: integer
-
Returns the index of the currently selected item. You may select an item by assigning its index to this property. By assigning
-1
to this property, all items will be deselected. Returns -1 if no items are selected
-
selectedItem
- Type: element
-
Holds the currently selected item. If no item is currently selected, this value will be
null
. You can select an item by setting this value. A select event will be sent to the controlling container (i.e. the listbox, richlistbox, radiogroup, etc., not the list item that was selected) when it is changed either via this property, theselectedIndex
property, or changed by the user.
-
value
- Type: string
-
Gets and sets the value of the
value
attribute. Fortextbox
and user editablemenulist
elements, the contents, as visible to the user, are read and set using theTextbox.value
and Menulist.value syntax.
Methods
-
appendItem( label, value )
- Return type: element
- Creates a new item and adds it to the end of the existing list of items. You may optionally set a value. The function returns the newly created element.
-
checkAdjacentElement( dir )
- Return type: no return value
- Deselects the currently selected
radio
button in the group and selects the one adjacent to it. If the argument <var>dir</var> istrue
, the next radio button is selected. If it isfalse
, the previous radio button is selected.
-
getIndexOfItem( item )
- Return type: integer
- Returns the zero-based position of the specified item. Items are numbered starting at the first item displayed in the list.
-
getItemAtIndex( index )
- Return type: element
- Returns the element that is at the specified index.
-
insertItemAt( index, label, value )
- Return type: element
- This method creates a new item and inserts it at the specified position. You may optionally set a value. The new item element is returned.
-
removeItemAt( index )
- Return type: element
- Removes the child item in the element at the specified index. The method returns the removed item.
Related
- Interfaces
nsIAccessibleProvider
,nsIDOMXULSelectControlElement