A public property, x of type Number , which you can get and set for objects of type ExampleClass. A public method, greet , which you can call on objects of type ExampleClass.
In this example, the x property and the greet method are in the public namespace. The public namespace makes methods and properties accessible from objects and classes outside the class. Packages provide the means to arrange ActionScript 3. For example, many classes related to working with files and directories on the computer are included in the flash. In this case, flash is one package that contains another package, filesystem.
And that package may contain other classes or packages. In fact, the flash. To reference the File class in ActionScript, you can write the following:. When referencing an ActionScript package from JavaScript, use the special runtime object.
Here, the File method is the constructor function corresponding to the class of the same name File. Only those properties and methods in the public namespace are available in JavaScript. For example, the File class in the flash. Both are available as properties of a JavaScript variable that instantiates a File object via the runtime.
File constructor method. Any code that instantiates an object of a certain type can access the public properties and methods in the class that defines that type. Also, any code can access the public static properties and methods of a public class.
Properties and methods designated as private are only available to code within the class. They cannot be accessed as properties or methods of an object defined by that class. Properties and methods in the private namespace are not available in JavaScript.
Properties and methods designated as protected are only available to code in the class definition and to classes that inherit that class.
Properties and methods in the protected namespace are not available in JavaScript. Properties and methods designated as internal are available to any caller within the same package. Classes, properties, and methods belong to the internal namespace by default. Additionally, custom classes can use other namespaces that are not available to JavaScript code. In both ActionScript 3.
The following ActionScript 3. It also includes the p parameter, which is optional, with a default value of An event listener is a function. When an object dispatches an event, the event listener responds to the event. The event, which is an ActionScript object, is passed to the event listener as a parameter of the function.
For example, when you call the load method of a Sound object to load an mp3 file , the Sound object attempts to load the sound. Then the Sound object dispatches any of the following events:.
Any class that can dispatch events either extends the EventDispatcher class or implements the IEventDispatcher interface. In each class listing for these classes in the ActionScript Language Reference, there is a list of events that the class can dispatch. You can register an event listener function to handle any of these events, using the addEventListener method of the object that dispatches the event.
For example, in the case of a Sound object, you can register for the progress and complete events, as shown in the following ActionScript code:. The following code illustrates this. Adobe Flash Platform. View Help PDF 5. ActionScript basics for JavaScript developers. Sound file ; sound. Data types corresponding to custom classes An ActionScript 3. The void data type The void data type is used as the return value for a function that, in fact, returns no value.
Runtime classes The runtime includes built-in classes, many of which are also included in standard JavaScript, such as the Array, Date, Math, and String classes and others. To reference the File class in ActionScript, you can write the following: flash. File Both built-in and custom classes can be arranged in packages.
File ; Here, the File method is the constructor function corresponding to the class of the same name File. There are four predefined namespaces: Namespace Description public Any code that instantiates an object of a certain type can access the public properties and methods in the class that defines that type. Then the Sound object dispatches any of the following events: Event Description complete When the data has loaded successfully. Although assigning types is optional in ActionScript, there are advantages to declaring types for objects: Typed objects allow for type checking of data not only at run-time, but also at compile time if you use strict mode.
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