SCRIPTING SELECT BOXES

Select boxes are created using the <select> and <option> elements. To allow for easier interaction with the control, the HTMLSelectElement type provides the following properties and methods in addition to those that are available on all form fields:

• add(newOption, relOption)—Adds a new <option> element to the control before the related option.
• multiple—A Boolean value indicating if multiple selections are allowed; equivalent to the HTML multiple attribute.
• options—An HTMLCollection of <option> elements in the control.
• remove(index)—Removes the option in the given position.
• selectedIndex—The zero-based index of the selected option or –1 if no options are selected. For select boxes that allow multiple selections, this is always the first option in the selection.
• size—The number of rows visible in the select box; equivalent to the HTML size attribute.

The type property for a select box is either...