--- title: radio slug: Mozilla/Tech/XUL/radio tags: - XUL Elements - XUL Reference translation_of: Archive/Mozilla/XUL/radio ---

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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

<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

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

示例：

// 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

Examples

Attributes

Example

See also

类型:boolean

表示元素是被禁用的。

示例：

Properties

Methods

Examples

Attributes

Example

See also

类型:boolean

表示元素是被禁用的。

示例：

Properties

Methods

Related