September 2008
Intermediate to advanced
660 pages
20h 32m
English
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Chapter 4. ActionScript
ActionScript is the programming language that you can use along with MXML to create sophisticated Flex applications. Although MXML is an important part of a Flex application, it is mostly used for creating the user interface, and it can go only so far in creating a complete application. For data models and sophisticated client-side business logic, you’ll need to use ActionScript as well.
Flex applications require ActionScript 3.0, which represents a significant maturation from earlier versions of the language. ActionScript 3.0 is compliant with the ECMA-262 specification and leverages parts of the pending ECMAScript Edition 4 specification. ActionScript 3.0 supports a wide range of features, including formalized classes, interfaces, packages, runtime exception handling, runtime data types, reflection, regular expressions, E4X (XML), and more.
ActionScript is a standards-based, object-oriented language. Because ActionScript is an object-oriented language, it can be viewed as a collection of APIs generally in the form of classes. There are three tiers of ActionScript APIs:
- Flash Player APIs
These APIs are part of the Flash Player itself, and they run natively in that runtime environment. Flash Player APIs consist of core classes such as
String,Number,Date, andArrayas well as Flash Player-specific classes such asDisplayObject,URLLoader,NetConnection,Video, andSound.- Flex framework APIs
These are the APIs that make up the Flex framework itself. The Flex framework ...
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