EN
Este conteúdo não está disponível em seu idioma, mas aqui está a versão em inglês.

option element | option object

Denotes one choice in a select element.

HTML 4.01 Specification, Section 17.6

HTML information

Closing Tagforbidden
CSS Displayblock

DOM Information

Inheritance Hierarchy

 Node
  Element
   HTMLElement
     option

Members

The option object has these types of members:

Events

The option object has these events.

EventDescription
abort

Fires when the user aborts the download.

blur

Fires when the object loses the input focus.

change

Fires when the contents of the object or selection have changed.

error

Fires when an error occurs during object loading.

input

Occurs when the text content of an element is changed through the user interface.

load

Fires immediately after the client loads the object.

onselect

Fires when the current selection changes.

readystatechange

Fires when the state of the object has changed.

reset

Fires when the user resets a form.

resize

Fires when the size of the object is about to change.

 

Methods

The option object has these methods.

MethodDescription
appendChild

Appends an element as a child to the object.

applyElement

Makes the element either a child or parent of another element.

clearAttributes

Removes all attributes and values from the object.

click

Simulates a click by causing the onclick event to fire.

cloneNode

Copies a reference to the object from the document hierarchy.

compareDocumentPosition

Compares the position of two nodes in a document.

componentFromPoint

Returns the component located at the specified coordinates via certain events.

contains

Checks whether the given element is contained within the object.

doScroll

Note   doScroll is no longer supported. Starting with IE11, use scrollLeft or scrollTop. For info, see Compatibility changes.

Simulates a click on a scroll bar component.

dragDrop

Initiates a drag event.

getAdjacentText

Returns the adjacent text string.

getAttribute

Retrieves the value of the specified attribute.

getAttributeNode

Retrieves an attribute object referenced by the attribute.name property.

getAttributeNodeNS

Gets an attribute object that matches the specified namespace and name.

getAttributeNS

Gets the value of the specified attribute within the specified namespace.

getBoundingClientRect

Retrieves an object that specifies the bounds of a collection of TextRectangle objects.

getClientRects

Retrieves a collection of rectangles that describes the layout of the contents of an object or range within the client. Each rectangle describes a single line.

getElementsByClassName

Gets a collection of objects that are based on the value of the class attribute.

getElementsByTagNameNS

Gets a collection of objects that are based on the specified element names within a specified namespace.

hasAttribute

Determines whether an attribute with the specified name exists.

hasAttributeNS

Determines whether an attribute that has the specified namespace and name exists.

hasAttributes

Determines whether one or more attributes exist for the object.

hasChildNodes

Returns a value that indicates whether the object has children.

insertAdjacentElement

Inserts an element at the specified location.

insertAdjacentHTML

Inserts the given HTML text into the element at the location.

insertAdjacentText

Inserts the given text into the element at the specified location.

insertBefore

Inserts an element into the document hierarchy as a child node of a parent object.

isDefaultNamespace

Indicates whether or not a namespace is the default namespace for a document.

isEqualNode

Determines if two nodes are equal.

isSameNode

Determines if two node references refer to the same node.

isSupported

Returns a value indicating whether or not the object supports a specific DOM standard.

lookupNamespaceURI

Gets the URI of the namespace associated with a namespace prefix, if any.

lookupPrefix

Gets the namespace prefix associated with a URI, if any.

mergeAttributes

Copies all read/write attributes to the specified element.

msMatchesSelector

Determines whether an object matches the specified selector.

normalize

Merges adjacent DOM objects to produce a normalized document object model.

removeAttribute

Removes an attribute from an object.

removeAttributeNode

Removes an attribute object from the object.

removeAttributeNS

Removes the specified attribute from the object.

removeChild

Removes a child node from the object.

removeNode

Removes the object from the document hierarchy.

replaceAdjacentText

Replaces the text adjacent to the element.

replaceChild

Replaces an existing child element with a new child element.

replaceNode

Replaces the object with another element.

setActive

Sets the object as active without setting focus to the object.

setAttribute

Sets the value of the specified attribute.

setAttributeNode

Sets an attribute object node as part of the object.

setAttributeNodeNS

Sets an attribute object as part of the object.

setAttributeNS

Sets the value of the specified attribute within the specified namespace.

swapNode

Exchanges the location of two objects in the document hierarchy.

 

Properties

The option object has these properties.

PropertyDescription

attributes

Retrieves a collection of attributes of the object.

canHaveChildren

Gets a value indicating whether the object can contain child objects.

canHaveHTML

Retrieves the value indicating whether the object can contain rich HTML markup.

childElementCount

Retrieves the number of immediate child nodes of the current element or a zero if the element does not contain any child nodes. childElementCount does not return all child nodes, only child nodes that are nodeType =1, or element nodes.

className

Sets or retrieves the class of the object.

clientHeight

Retrieves the height of the object including padding, but not including margin, border, or scroll bar.

clientLeft

Retrieves the distance between the offsetLeft property and the true left side of the client area.

clientTop

Retrieves the distance between the offsetTop property and the true top of the client area.

clientWidth

Retrieves the width of the object including padding, but not including margin, border, or scroll bar.

constructor

Returns a reference to the constructor of an object.

dataFormatAs

Sets or retrieves the rendering format for the data supplied to the object.

dataSrc

Sets or retrieves the source of the data for data binding.

defaultSelected

Sets or retrieves the status of an option.

dir

Sets or retrieves the reading order of the object.

disabled

Sets or retrieves a value that indicates whether the user can interact with the object.

firstChild

Gets a reference to the first child in the childNodes collection of the object.

firstElementChild

Retrieves a reference to the first child element, or null if there are no child elements.

form

Retrieves a reference to the form that the object is embedded in.

id

Sets or retrieves the string identifying the object.

index

Sets or retrieves the ordinal position of an option in a list box.

innerHTML

Sets or retrieves the HTML between the start and end tags of the object.

innerText

Sets or retrieves the text between the start and end tags of the object.

isContentEditable

Gets the value that indicates whether the user can edit the contents of the object.

isDisabled

Gets the value that indicates whether the user can interact with the object.

isMultiLine

Retrieves the value indicating whether the content of the object contains one or more lines.

isTextEdit

Retrieves whether a TextRange object can be created using the object.

label

Sets or retrieves a value that you can use to implement your own label functionality for the object.

lang

Sets or retrieves the language to use.

lastChild

Gets a reference to the last child in the childNodes collection of an object.

lastElementChild

Retrieves a reference to the last child element or null if there are no child elements.

localName

Retrieves the local name of the fully qualified XML declaration for a node.

namespaceURI

Retrieves the namespace URI of the fully qualified XML declaration for a node.

nextElementSibling

Retrieves a reference to the sibling element that immediately follows or null if the element does not have any sibling elements that follow it.

nextSibling

Retrieves a reference to the next child of the parent for the object.

nodeName

Gets the name of a particular type of node.

nodeType

Retrieves the type of the requested node.

nodeValue

Gets or sets the value of a node.

offsetHeight

Retrieves the height of the object relative to the layout or coordinate parent, as specified by the offsetParent property.

offsetLeft

Retrieves the calculated left position of the object relative to the layout or coordinate parent, as specified by the offsetParent property.

offsetParent

Retrieves a reference to the container object that defines the offsetTop and offsetLeft properties of the object.

offsetTop

Retrieves the calculated top position of the object relative to the layout or coordinate parent, as specified by the offsetParent property.

offsetWidth

Retrieves the width of the object relative to the layout or coordinate parent, as specified by the offsetParent property.

outerHTML

Sets or retrieves the object and its content in HTML.

outerText

Sets or retrieves the text of the object.

ownerDocument

Retrieves the document object associated with the node.

parentElement

Retrieves the parent object in the object hierarchy.

parentNode

Retrieves the parent object in the document hierarchy.

parentTextEdit

Retrieves the container object in the document hierarchy that can be used to create a TextRange containing the original object.

prefix

Retrieves the local name of the fully qualified XML declaration for a node.

previousElementSibling

Retrieves a reference to the immediately preceding sibling element or null if the element does not have any preceding siblings.

previousSibling

Gets a reference to the previous child of the parent for the object.

readyState

Retrieves the current state of the object.

role

Sets or retrieves the role for this element.

scrollHeight

Retrieves the scrolling height of the object.

scrollLeft

Sets or retrieves the distance between the left edge of the object and the leftmost portion of the content currently visible in the window.

scrollTop

Sets or retrieves the distance between the top of the object and the topmost portion of the content currently visible in the window.

scrollWidth

Retrieves the scrolling width of the object.

selected

Sets or retrieves whether the option in the list box is the default item.

sourceIndex

Retrieves the ordinal position of the object, in source order, as the object appears in the document's all collection.

style

Sets an inline style for the element.

tagName

Retrieves the tag name of the object.

text

Sets or retrieves the text string specified by the option tag.

textContent

Sets or retrieves the text content of an object and any child objects.

title

Sets or retrieves advisory information (a ToolTip) for the object.

uniqueID

Retrieves an autogenerated, unique identifier for the object.

uniqueNumber

Retrieves the element's unique number.

value

Sets or retrieves the value which is returned to the server when the form control is submitted.

 

Standards information

Remarks

You can create new option elements dynamically with the document.createElement method, but you cannot change properties until the new element is added to a select object. Or, you can create fully formed elements by using the Option object, as follows:


 var opt = new Option( 'Text', 'Value', fDefaultSelected ); 

You can add option elements only to a select element that is located in the same window where the option elements are created.

Except for background-color and color, style settings applied through the style object for the option element are ignored. In addition, style settings applied directly to individual options override those applied to the containing select element as a whole.

Examples

This example uses the option element to create individual items in a drop-down list box.


<select id="oCars" onchange="fnChange()" size="1">
  <option value="1">BMW</option>
  <option value="2">PORSCHE</option>
  <option selected="" value="3">MERCEDES</option>
</select> <textarea id="oData"></textarea>

This example uses the options collection to append the selected item of the list box in a text area.


<script>
  function fnChange(){
    oData.value+=oCars.options[oCars.selectedIndex].text + "\n";
  }
</script>


See also

multiple

 

 

Mostrar:
© 2014 Microsoft. Todos os direitos reservados.