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4.10.12 The option element

Categories:
None.
Contexts in which this element can be used:
As a child of a select element.
As a child of a datalist element.
As a child of an optgroup element.
Content model:
Text.
Content attributes:
Global attributes
disabled
label
selected
value
DOM interface:
[NamedConstructor=Option(),
 NamedConstructor=Option(DOMString text),
 NamedConstructor=Option(DOMString text, DOMString value),
 NamedConstructor=Option(DOMString text, DOMString value, boolean defaultSelected),
 NamedConstructor=Option(DOMString text, DOMString value, boolean defaultSelected, boolean selected)]
interface HTMLOptionElement : HTMLElement {
           attribute boolean disabled;
  readonly attribute HTMLFormElement? form;
           attribute DOMString label;
           attribute boolean defaultSelected;
           attribute boolean selected;
           attribute DOMString value;

           attribute DOMString text;
  readonly attribute long index;
};

The option element represents an option in a select element or as part of a list of suggestions in a datalist element.

In certain circumstances described in the definition of the select element, an option element can be a select element's placeholder label option. A placeholder label option does not represent an actual option, but instead represents a label for the select control.

The disabled attribute is a boolean attribute. An option element is disabled if its disabled attribute is present or if it is a child of an optgroup element whose disabled attribute is present.

An option element that is disabled must prevent any click events that are queued on the user interaction task source from being dispatched on the element.

The label attribute provides a label for element. The label of an option element is the value of the label content attribute, if there is one, or, if there is not, the value of the element's text IDL attribute.

The value attribute provides a value for element. The value of an option element is the value of the value content attribute, if there is one, or, if there is not, the value of the element's text IDL attribute.

The selected attribute is a boolean attribute. It represents the default selectedness of the element.

The selectedness of an option element is a boolean state, initially false. Except where otherwise specified, when the element is created, its selectedness must be set to true if the element has a selected attribute. Whenever an option element's selected attribute is added, its selectedness must be set to true.

The Option() constructor with three or fewer arguments overrides the initial state of the selectedness state to always be false even if the third argument is true (implying that a selected attribute is to be set). The fourth argument can be used to explicitly set the initial selectedness state when using the constructor.

A select element whose multiple attribute is not specified must not have more than one descendant option element with its selected attribute set.

An option element's index is the number of option element that are in the same list of options but that come before it in tree order. If the option element is not in a list of options, then the option element's index is zero.

option . selected

Returns true if the element is selected, and false otherwise.

Can be set, to override the current state of the element.

option . index

Returns the index of the element in its select element's options list.

option . form

Returns the element's form element, if any, or null otherwise.

option . text

Same as textContent, except that spaces are collapsed.

option = new Option( [ text [, value [, defaultSelected [, selected ] ] ] ] )

Returns a new option element.

The text argument sets the contents of the element.

The value argument sets the value attribute.

The defaultSelected argument sets the selected attribute.

The selected argument sets whether or not the element is selected. If it is omitted, even if the defaultSelected argument is true, the element is not selected.

The disabled IDL attribute must reflect the content attribute of the same name. The defaultSelected IDL attribute must reflect the selected content attribute.

The label IDL attribute, on getting, must return the element's label. On setting, the element's label content attribute must be set to the new value.

The value IDL attribute, on getting, must return the element's value. On setting, the element's value content attribute must be set to the new value.

The selected IDL attribute, on getting, must return true if the element's selectedness is true, and false otherwise. On setting, it must set the element's selectedness to the new value.

The index IDL attribute must return the element's index.

The text IDL attribute, on getting, must return the value of the textContent IDL attribute on the element, with leading and trailing whitespace stripped, and with any sequences of two or more space characters replaced by a single U+0020 SPACE character. On setting, it must act as if the textContent IDL attribute on the element had been set to the new value.

The form IDL attribute's behavior depends on whether the option element is in a select element or not. If the option has a select element as its parent, or has an optgroup element as its parent and that optgroup element has a select element as its parent, then the form IDL attribute must return the same value as the form IDL attribute on that select element. Otherwise, it must return null.

Several constructors are provided for creating HTMLOptionElement objects (in addition to the factory methods from DOM Core such as createElement()): Option(), Option(text), Option(text, value), Option(text, value, defaultSelected), and Option(text, value, defaultSelected, selected). When invoked as constructors, these must return a new HTMLOptionElement object (a new option element). If the text argument is present, the new object must have as its only child a Text node whose data is the value of that argument. If the value argument is present, the new object must have a value attribute set with the value of the argument as its value. If the defaultSelected argument is present and true, the new object must have a selected attribute set with no value. If the selected argument is present and true, the new object must have its selectedness set to true; otherwise the fourth argument is absent or false, and the selectedness must be set to false, even if the defaultSelected argument is present and true. The element's document must be the active document of the browsing context of the Window object on which the interface object of the invoked constructor is found.