User Guide

Object 993
setter:Function - The function that is invoked to set the value of the property; this
parameter is a Function object. If you pass the value
null for this parameter, the property is
read-only.
Returns
Boolean - A Boolean value: true if the property is successfully created; false otherwise.
Example
In the following example, an object has two internal methods,
setQuantity() and
getQuantity(). A property, bookcount, can be used to invoke these methods when it is
either set or retrieved. A third internal method,
getTitle(), returns a read-only value that is
associated with the property
bookname. When a script retrieves the value of
myBook.bookcount, the ActionScript interpreter automatically invokes
myBook.getQuantity(). When a script modifies the value of myBook.bookcount, the
interpreter invokes
myObject.setQuantity(). The bookname property does not specify a
set function, so attempts to modify bookname are ignored.
function Book() {
this.setQuantity = function(numBooks:Number):Void {
this.books = numBooks;
};
this.getQuantity = function():Number {
return this.books;
};
this.getTitle = function():String {
return "Catcher in the Rye";
};
this.addProperty("bookcount", this.getQuantity, this.setQuantity);
this.addProperty("bookname", this.getTitle, null);
}
var myBook = new Book();
myBook.bookcount = 5;
trace("You ordered "+myBook.bookcount+" copies of "+myBook.bookname);
// output: You ordered 5 copies of Catcher in the Rye