An element that can be used for drop-down choice lists. The user may select one of the elements displayed in the menulist. The currently selected choice is displayed on the menulist element. To create the drop-down, put a menupopup inside the menulist containing the choices as menuitem elements. The command event may be used to execute code when the menulist selection changes.

More information is available in the XUL tutorial.

Attributes
accesskey, crop, disableautoselect, disabled, editable, focused, image, label, oncommand, open, preference, readonly, sizetopopup, tabindex, value
Properties
accessibleType, crop, description, disableautoselect, disabled, editable, editor, image, inputField, itemCount, label, menuBoxObject, menupopup, open, selectedIndex, selectedItem, tabIndex, value
Methods
appendItem, contains, getIndexOfItem, getItemAtIndex, insertItemAt, removeAllItems, removeItemAt, select

Examples

  <menulist>
    <menupopup>
      <menuitem label="option 1" value="1"/>
      <menuitem label="option 2" value="2"/>
      <menuitem label="option 3" value="3"/>
      <menuitem label="option 4" value="4"/>
    </menupopup>
  </menulist>

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

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.

disableautoselect
Type: boolean
If this attribute is true or omitted, the selected item on the menu will update to match what the user entered in the textbox. If the text does not match any of the items in the list, the menu selection is cleared. If this attribute is false, the selection is never updated to match the text box. This attribute applies only to editable menulists.
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.

editable
Type: boolean
Indicates that the value of the menulist can be modified by typing directly into the value field. This is rendered as a textbox with a drop-down arrow beside it. The user may enter text into the textbox or select one of the choices by clicking from the drop-down.
focused
Type: boolean
This attribute is true if the element is focused.
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。

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.
open
Type: boolean
For the menu type buttons, the open attribute is set to true when the menu is open. The open attribute is not present if the menu is closed.

 

preference
Type: id
Connects the element to a corresponding preference. This attribute only has any effect when used inside a prefwindow. More information is available in the Preferences System article.
readonly
Type: boolean
If set to true, then the user cannot change the value of the element. However, the value may still be modified by a script.
sizetopopup
Type: one of the values below
Indicates how the menu width and the menupopup width are determined. If the sizetopopup attribute is left out or set to none, the menu will be its preferred width and the popup may extend outside of this width, unaffected by the maximum width of the menu itself. Otherwise, the menu will size itself to at least the size of the popup. If the menu has a maximum width, the popup will also be this width.
none
The width of the popup will not be constrained to the size of the menu.
pref
The preferred width of the menu label or button will be the size needed for the popup contents. This is the default value for menulists.
always
Both the preferred and minimum width of the menu label or button will be the same as that necessary for the menupopup.
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

accessibleType
Type: integer
A value indicating the type of accessibility object for the element.

disableautoselect
Type: boolean
Gets and sets the value of the disableautoselect attribute.
editable
Type: boolean
Returns true if the element is editable. Autocomplete fields are editable so this property always returns true for those.

 

editor
Type: nsIEditor
A reference to the nsIEditor for editable text. This property is read only.
image
Type: image URL
The image associated with the currently selected item.
inputField
Type: textbox element
A reference to the textbox element used for editable menu lists. This property is read only and applies to editable menulists only.
itemCount
Type: integer
Read only property holding the number of child items.
label
Type: string
Gets and sets the value of the label attribute.

menupopup
Type: menupopup element
A reference to the menupopup used by the menu or menulist. This property is read-only.
open
Type: boolean
Gets and sets the value of the open attribute.
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.

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 element when it is changed either via this property, the selectedIndex property, or changed by the user.

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 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

appendItem( label, value, description )
Return type: element
Creates a new menuitem element and adds it to the end of the menulist. You may optionally set a value and description. The function returns the new item.
contains( item )
Return type: boolean
Returns true if the menulist contains the specified menuitem as one of its items.
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.
removeAllItems()
Return type: no return value
Removes all of the items in the menu.
removeItemAt( index )
Return type: element
Removes the child item in the element at the specified index. The method returns the removed item.
select()
Return type: no return value
Select all the text in the menulist's textbox. This method applies to editable menulists only.

Elements
menu, menubar, menuitem, menupopup, menuseparator
Interfaces
nsIAccessibleProvider, nsIDOMXULMenuListElement

 

 

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