A single tab which should be placed inside a tabs element. The user may click a tab to bring the associated page of the tabbox to the front.

More information is available in the XUL tutorial.

Attributes
accesskey, afterselected, beforeselected, command, crop, disabled, first-tab, image, label, last-tab, linkedpanel, oncommand, pending, pinned, selected, tabindex, unread, validate, value
Properties
accessKey, accessibleType, command, control, crop, disabled, image, label, linkedPanel, selected, tabIndex, value

Examples

(example needed)

Attributes

accesskey
Type: character
This should be set to a character that is used as a shortcut key. This should be one of the characters that appears in the label label for the element.

 

afterselected
Type: boolean
This is set to true if the tab is immediately after the currently selected tab. This is automatically set when needed and you shouldn't adjust it manually. This is primarily useful for themes so that they can adjust the appearance of the area around the selected tab.
beforeselected
Type: boolean
This is set to true if the tab is immediately before the currently selected tab. This is set automatically set when needed and you shouldn't adjust it manually. This is primarily useful for themes so that they can adjust the appearance of the area around the selected tab.
crop
Type: one of the values below
If the label of the element is too big to fit in its given space, the text will be cropped on the side specified by the crop attribute. An ellipsis will be used in place of the cropped text. If the box direction is reversed, the cropping is reversed.
start
The text will be cropped on its left side in left-to-right text locales, and the right side in right-to-left locales.
end
The text will be cropped on its right side in left-to-right text locales, and the right side in right-to-left locales.
left
The text will be cropped on its left side.
right
The text will be cropped on its right side.
center
The text will be cropped in the middle, showing both the start and end of the text normally.
none
The text will be not be cropped using an ellipsis. However, the text will simply be cut off if it is too large. The side depends on the CSS text alignment.
Depending on the platform and theme being used, some elements will have set a maximum width so they will always appear cropped. If you wish to use the value none and the displayed text is larger than this maximum width, you may be able to use the max-width CSS property (or the maxwidth attribute) to override this size. For example, for a menuitem in a menu you can add the following CSS rule when you want to use the value none:
menupopup > menuitem, menupopup > menu { max-width: none; }
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 the command 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.
 
fadein
Type: boolean
This attribute is set to true if the tab is fading in or out. This typically means that the tab is in the process of appearing or disappearing.
 
first-tab
Type: boolean
This attribute will be set to true for the first tab. This attribute should not be set manually, but is useful in a theme if the first tab should be styled differently.
image
Type: URI
The URI of the image to appear on the element. If this attribute is empty or left out, no image appears. The position of the image is determined by the dir and orient attributes.
label
Type: string
The label that will appear on the element. If this is left out, no text appears. For an editable menuitem element the value of this attribute is copied to the menulist.value property upon user selection of the menuitem.

 

last-tab
Type: boolean
This attribute will be set to true for the last tab. This attribute should not be set manually, but is useful in a theme if the last tab should be styled differently.
linkedpanel
Type: id
The id of the linked tabpanel element that will be displayed when the tab is selected. If this attribute is not used, the tab will be connected to the panel at the corresponding index in the tabpanels element that the tab is in its tabs container. However, if this attribute is used, this behavior is overridden, and the tab will always be linked to a specific panel. This might be used to avoid duplication by linking several tabs to one panel with slight differences to the content adjusted in the select event.
oncommand
Type: script code
This event handler is called when the command is activated. This occurs when a user selects a menu item or presses a keyboard shortcut attached to the command.
pending
Type: boolean
This attribute is set to true if the tab is currently in the process of being restored by the session store service. Once the tab is restored, this attribute is removed. You can determine if a tab is being restored by checking to see if hasAttribute("pending") is true. If the user has turned on the "Don't load tabs until selected" preference, the pending attribute is set on tabs until they get loaded.
pinned
Type: boolean
This attribute is set to true if the tab has been pinned (that is, if it's an app tab). The tabbrowser element's pinTab and unpinTab methods handle pinning and unpinning tabs.
selected
Type: boolean
This attribute is set to true if the tab is selected by default.
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 higher tabindex are later in the tab sequence.
unread
Type: boolean
This attribute is set to true if the tab is unread; that is, either it has not yet been selected during the current session, or has changed since the last time it was selected. This attribute is not present if the tab is not unread.
validate
Type: one of the values below
This attribute indicates whether to load the image from the cache or not. This would be useful if the images are stored remotely or you plan on swapping the image frequently. The following values are accepted, or leave out the attribute entirely for default handling:
always
The image is always checked to see whether it should be reloaded.
never
The image will be loaded from the cache if possible.

Properties

accessKey
Type: character
Gets and sets the value of the accesskey attribute.
accessibleType
Type: integer
A value indicating the type of accessibility object for the element.
command
Type: element id
Gets and sets the value of the command attribute.
control
Type: tabs element
Returns the enclosing tabs element.
crop
Type: string
Gets and sets the value of the crop attribute.
disabled
Type: boolean
Gets and sets the value of the disabled attribute.
image
Type: image URL
Gets and sets the value of the image attribute.
label
Type: string
Gets and sets the value of the label attribute.
linkedPanel
Type: id of a tabpanel element
Gets and sets the value of the linkedpanel attribute.
selected
Type: boolean
This property's value is true if this element is selected, or false if it is not. This property is read only. This property is available for menuitem and menuseparator elements in Firefox 3.
tabIndex
Type: integer
Gets and sets the value of the tabindex attribute.
value
Type: string
Gets and sets the value of the value attribute. For textbox and user editable menulist elements, the contents, as visible to the user, are read and set using the Textbox.value and Menulist.value syntax.

 

Methods

Inherited Methods
addEventListener(), appendChild(), blur, click, cloneNode(), compareDocumentPosition, dispatchEvent(), doCommand, focus, getAttribute(), getAttributeNode(), getAttributeNodeNS(), getAttributeNS(), getBoundingClientRect(), getClientRects(), getElementsByAttribute, getElementsByAttributeNS, getElementsByClassName(), getElementsByTagName(), getElementsByTagNameNS(), getFeature, getUserData, hasAttribute(), hasAttributeNS(), hasAttributes(), hasChildNodes(), insertBefore(), isDefaultNamespace(), isEqualNode, isSameNode, isSupported(), lookupNamespaceURI, lookupPrefix, normalize(), querySelector(), querySelectorAll(), removeAttribute(), removeAttributeNode(), removeAttributeNS(), removeChild(), removeEventListener(), replaceChild(), setAttribute(), setAttributeNode(), setAttributeNodeNS(), setAttributeNS(), setUserData

Notes

Note: Prior to Gecko 1.9, disabling tabs fails; even while disabled, they still accept events.

Also, "unhiding" a tab leads to unpredictable ordering of the tabs. See bug 307088 and bug 261826. Use collapsed instead of hidden.

Elements
tabbox, tabs, tabpanels, tabpanel.
Interfaces
nsIAccessibleProvider, nsIDOMXULSelectControlItemElement

Document Tags and Contributors

Last updated by: Sheppy,