menulist

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

Example

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

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: 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.

<!-- Checkbox enables/disables the button -->
<checkbox label="Enable button" 
    onclick="document.getElementById('buttRemove').disabled = this.checked"/>
<button id="buttRemove" label="Remove All" disabled="true"/>

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; The tab order of the element. The tab order is the order in which the focus is moved when the user presses the "<kbd>tab</kbd>" key. Elements with a higher tabindex are later in the tab sequence.

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.

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

description: Type: string; Set to the description of the currently selected menuitem.

disableautoselect: Type: boolean; Gets and sets the value of the disableautoselect attribute.

disabled: Type: boolean; Gets and sets the value of the disabled 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.

menuBoxObject: Type: nsIMenuBoxObject; A reference to the nsIMenuBoxObject which implements the menu.

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

menulist

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menulist

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