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An element that can be turned on and off. Radio buttons are almost always grouped together in groups. Only one radio button within the same radiogroup may be selected at a time. The user can switch which radio button is turned on by selecting it with the mouse or keyboard. Other radio buttons in the same group are turned off. A label, specified with the label attribute may be added beside the radio button.

More information is available in the XUL tutorial.

Attributes
accesskey, command, crop, disabled, focused, group, image, label, selected, tabindex, value
Properties
accessKey, accessibleType, control, crop, disabled, image, label, radioGroup, selected, tabIndex, value

Examples

Image:XUL_ref_radio.png
<radiogroup>
  <radio id="orange" label="Red" accesskey="R"/>
  <radio id="violet" label="Green"  accesskey="G" selected="true"/>
  <radio id="yellow" label="Blue"  accesskey="B" disabled="true"/>
</radiogroup>

Attributes

accesskey
类型: character【字符】
本属性允许为控件(元素)设定一个字符作为快捷键,这个字符应该是 label 属性文本中的一个字符。该字符将会被加下划线以重点强调,平台和主体的变换并不影响这一表现行为。 当用户点击 ALT (在其他平台上具有类似功能的键) 和这个字符对应的按键时, 控件(元素)将立刻被从窗口中的某处激活或/并且获得焦点 。虽说字符不分大小写,但是当label中存在大写字符和小写字符时,快捷键的字符将首先选择与之完全匹配的那一个,如果label中存在两个或更多的与accesskey字符相同的字符,其中的第一个字符将被加下划线。
      *(有些键在监听按键事件时,分别对应event.ctrlKey和event.metaKey。)

 

Example

Image:XUL_ref_accesskey_attr.png
<vbox>	
  <label value="Enter Name" accesskey="e" control="myName"/>
  <textbox id="myName"/>
  <button label="Cancel" accesskey="n"/>
  <button label="Ok" accesskey="O"/>
</vbox>

See also

label attribute, acceltext attribute

command
Type: element id
Set to the id of a command element that is being observed by the element.

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.
  • end: The text will be cropped on its right side.
  • 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.

disabled
 
类型:boolean
表示元素是被禁用的。

如果这个元素的disabled属性被设置为true,表示元素被禁用,被禁用的属性在页面上通常会显示灰色文本,它无法响应用户的操作,它也无法得到光标。

然而,这个元素仍然能够响应鼠标事件,如果要启用这个元素,把disabled设置为false

示例:

Image:XUL_ref_attr_disabled.png
// Disabling an element
document.getElementById('buttonRemove').setAttribute("disabled", "true");

// Enabling back an element by removing the "disabled" attribute
document.getElementById('buttonRemove').removeAttribute("disabled");

Firefox 3.5 note

For keyset elements, support for this attribute was added in Firefox 3.5.

focused
Type: boolean
This attribute is true if the element is focused.
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.
image
Type: image URL
The URL 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.
label 在元素上显示。如果左侧出界,则不显示任何文字。

selected
Type: boolean
Indicates whether the element is selected or not. This value is read-only. To change the selection, set either the selectedIndex or selectedItem property of the containing element.

tabindex
Type:integer
当用户按下 "tab" 键时焦点移动到元素上的顺序。tabindex 数字越大,顺序越靠后。

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.

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.

control
Type: radiogroup element
Returns the enclosing radiogroup that the radio element is contained within, which may or may not be its direct parent.
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.

radioGroup
Type: radiogroup element
Equivalent to the control property.
selected<magic name="\"PAGENAME\"/"></magic>
Type: boolean
This property's value is true if this element is selected, or false if it is not. This property is read only.
tabIndex
Type: integer
Gets and sets the value of the tabindex attribute.

value
Type: string
Gets and sets the value of the value attribute.

Methods

Inherited from XUL element
blur, click, doCommand, focus, getElementsByAttribute

Inherited from DOM element
addEventListener(), appendChild(), dispatchEvent(), getAttribute(), getAttributeNode(), getAttributeNodeNS(), getAttributeNS(), getElementsByTagName(), getElementsByTagNameNS(), hasAttribute(), hasAttributeNS(), hasAttributes(), hasChildNodes(), insertBefore(), isSupported(), normalize(), removeAttribute(), removeAttributeNode(), removeAttributeNS(), removeChild(), removeEventListener(), replaceChild(), setAttribute(), setAttributeNode(), setAttributeNodeNS(), setAttributeNS()

Elements
radiogroup, checkbox
Interfaces
nsIAccessibleProvider, nsIDOMXULSelectControlItemElement, nsIDOMXULLabeledControlElement
 

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