From http://www.w3schools.com (Copyright Refsnes Data)

HTML DOM Select Object

Select Object

The Select object represents a dropdown list in an HTML form.

For each instance of an HTML <select> tag in a form, a Select object is created.

You can access a Select object by searching through the elements[] array of the form, or by using document.getElementById().

IE: Internet Explorer, F: Firefox, O: Opera, W3C: World Wide Web Consortium (Internet Standard).

Select Object Collections

Collection Description IE  F O W3C
options[] Returns an array of all the options in a dropdown list 4 1 9 Yes

Select Object Properties

Property Description IE  F O W3C
disabled Sets or returns whether or not a dropdown list should be disabled 5 1 9 Yes
form Returns a reference to the form that contains the dropdown list 4 1 9 Yes
id Sets or returns the id of a dropdown list 4 1 9 Yes
length Returns the number of options in a dropdown list 4 1 9 Yes
multiple Sets or returns whether or not multiple items can be selected 4 1 9 Yes
name Sets or returns the name of a dropdown list 4 1 9 Yes
selectedIndex Sets or returns the index of the selected option in a dropdown list 4 1 9 Yes
size Sets or returns the number of visible rows in a dropdown list 4 1 9 Yes
tabIndex Sets or returns the tab order for a dropdown list 5 1 9 Yes
type Returns the type of form element a dropdown list is 4 1 9 Yes

Standard Properties

Property Description IE  F O W3C
className Sets or returns the class attribute of an element 5 1 9 Yes
dir Sets or returns the direction of text 5 1 9 Yes
lang Sets or returns the language code for an element 5 1 9 Yes
title Sets or returns an element's advisory title 5 1 9 Yes

Select Object Methods

Method Description IE F O W3C
add() Adds an option to a dropdown list 4 1 9 Yes
blur() Removes focus from a dropdown list 4 1 9 Yes
focus() Sets focus on a dropdown list 4 1 9 Yes
remove() Removes an option from a dropdown list 4 1 9 Yes

From http://www.w3schools.com (Copyright Refsnes Data)