HTML DOM Select object
Select object
The Select object represents a down-and-down list in an HTML form.
In HTML forms, every time a tag appears, a Select object is created.
You can access a Select object by traversing the form's array of elements, or you can use document.getElementById().
Select object collection
W3C： W3C standard.
| gather | describe | W3C |
|---|---|---|
| options | Returns an array containing all options in the drop-down list. | Yes |
Select object properties
| Attributes | describe | W3C |
|---|---|---|
| disabled | Set or return to whether the drop-down list should be disabled. | Yes |
| form | Returns a reference to a form that contains a drop-down list. | Yes |
| length | Returns the number of options in the drop-down list. | Yes |
| multiple | Set or return to whether multiple items are selected. | Yes |
| name | Set or return the name of the drop-down list. | Yes |
| selectedIndex | Set or return the index number of the selected item in the drop-down list. | Yes |
| size | Set or return to the number of visible lines in the drop-down list. | Yes |
| type | Returns the form type of the drop-down list. | Yes |
Select object method
| method | describe | W3C |
|---|---|---|
| add() | Add an option to the drop-down list. | Yes |
| remove() | Delete an option from the drop-down list. | Yes |
Standard properties and events
Select objects also support the standard properties and events.