A button that can be pressed by the user. Event handlers can be used to trap mouse, keyboard and other events. It is typically rendered as a grey outset rectangle. You can specify the label of the button using the label
attribute or by placing content inside the button.
More information is available in the XUL tutorial.
- Attributes
- accesskey, autocheck, checkState, checked, command, crop, dir, disabled, dlgtype, group, icon, image, label, open, orient, tabindex, type
- Properties
- accessKey, accessibleType, autoCheck, checkState, checked, command, crop, dir, disabled, dlgType, group, image, label, open, orient, tabIndex, type
Examples
<button label="Press Me" oncommand="alert('You pressed me!');"/>
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.
-
autocheck
- Type: boolean
- If this attribute is
true
or left out, the checked state of the button will be switched each time the button is pressed. If this attribute isfalse
, the checked state must be adjusted manually. When autocheck is true, the button type should be "checkbox" or "radio".
checkState
- Type: integer, values
0
,1
, or2
- This attribute may be used to create three state buttons, numbered 0, 1 and 2. When in state 0 or 1, pressing the button will switch to the opposite state. When in state 2, pressing the button will switch to state 0. This means that the button acts like a checkbox except that there is a third state which must be set manually by adjusting the check state. If you wish to have different behavior for how the states are adjusted, set the
autoCheck
attribute tofalse
and adjust the state with a script. Thetype
attribute must be set tocheckbox
for buttons with a check state. Constants for the possible values for this attribute are in thensIDOMXULButtonElement
interface.
-
checked
- Type: boolean
- Indicates whether the element is checked or not.
- Use
hasAttribute()
to determine whether this attribute is set instead ofgetAttribute()
. - For buttons, the
type
attribute must be set tocheckbox
orradio
for this attribute to have any effect.
-
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 valuenone
: -
menupopup > menuitem, menupopup > menu { max-width: none; }
dir
- Type: one of the values below
- The direction in which the child elements of the element are placed.
normal
- For scales, the scale's values are ordered from left to right (for horizontal scales) or from top to bottom (for vertical scales) For other elements, the elements are placed left to right or top to bottom in the order they appear in the XUL code.
reverse
- For scales, the scale's values are ordered from right to left (for horizontal scales) or from bottom to top (for vertical scales). For other elements, they are placed right to left or bottom to top. This is reverse of the order in which they appear in the XUL code.
-
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.
dlgtype
- Type: one of the values below
- The dialog type of the button, used only when the button is in a dialog box. You can use this feature to replace the standard dialog box buttons with custom buttons, yet the dialog event methods will still function. For example, if the
dlgType
is set toaccept
, the button will replace the dialog box's accept button, which is usually labeledOK
. Using this attribute on a button that is not in a dialog box has no effect. The following values can be used as the dialog type: accept
- The OK button, which will accept the changes when pressed.
cancel
- The cancel button which will cancel the operation.
help
- A help button for displaying help about the dialog.
disclosure
- A button to show more information. This might be a button or a disclosure triangle.
extra1
- An optional additional button.
extra2
- A second optional additional button.
-
group
- Type: string group name
- Buttons with type="radio" and the same value for their group attribute are put into the same group. Only one button from each group can be checked at a time. If the user selects one the buttons, the others in the group are unchecked.
icon
- Mozilla 1.8
- Type: string
- This attribute should be used to set the usage for common buttons. Some platforms display these buttons with a small icon indicating their usage. This should be used in place of the
image
attribute. Possible values include:accept
,cancel
,help
,open
,save
,find
,clear
,yes
,no
,apply
,close
,print
,add
,remove
,refresh
,go-forward
,go-back
,properties
,select-font
,select-color
,network
. If you are using a button that matches one of these common usages, use theicon
attribute to indicate this. See the appearance of the different icons on some available platforms.
-
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 themenulist
.value property upon user selection of themenuitem
.
-
open
- Type: boolean
-
For the
menu
type
buttons, theopen
attribute is set totrue
when the menu is open. Theopen
attribute is not present if the menu is closed.
orient
- Type: one of the values below
- Used to specify whether the children of the element are oriented horizontally or vertically. The default value depends on the element. You can also use the
-moz-box-orient
style property.horizontal
- Child elements of the element are placed next to each other in a row in the order that they appear in the XUL source.
vertical
- Child elements of the element are placed under each other in a column in the order that they appear in the XUL source.
-
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.
Properties
-
accessibleType
- Type: integer
- A value indicating the type of accessibility object for the element.
-
checkState
-
Type: integer, values
0
,1
, or2
-
Gets and sets the value of the
checkState
attribute.
Methods
Related
- Interfaces
nsIAccessibleProvider
,nsIDOMXULButtonElement