ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
About the HTML environment
unload events (for body and frameset objects)
Adobe AIR 1.0 and later
In the top-level frameset or body tag of a window (including the main window of the application), do not use the
unload event to respond to the window (or application) being closed. Instead, use exiting event of the
NativeApplication object (to detect when an application is closing). Or use the closing event of the NativeWindow
object (to detect when a window is closing). For example, the following JavaScript code displays a message
("Goodbye.") when the user closes the application:
var app = air.NativeApplication.nativeApplication;
app.addEventListener(air.Event.EXITING, closeHandler);
function closeHandler(event)
{
alert("Goodbye.");
}
However, scripts can successfully respond to the unload event caused by navigation of a frame, iframe, or top-level
window content.
Note: These limitations may be removed in a future version of Adobe AIR.
JavaScript Window object
Adobe AIR 1.0 and later
The Window object remains the global object in the JavaScript execution context. In the application sandbox, AIR
adds new properties to the JavaScript Window object to provide access to the built-in classes of AIR, as well as
important host objects. In addition, some methods and properties behave differently depending on whether they are
within the application sandbox or not.
Window.runtime property The runtime property allows you to instantiate and use the built-in runtime classes from
within the application sandbox. These classes include the AIR and Flash Player APIs (but not, for example, the Flex
framework). For example, the following statement creates an AIR file object:
var preferencesFile = new window.runtime.flash.filesystem.File();
The AIRAliases.js file, provided in the AIR SDK, contains alias definitions that allow you to shorten such references.
For example, when AIRAliases.js is imported into a page, a File object can be created with the following statement:
var preferencesFile = new air.File();
The window.runtime property is only defined for content within the application sandbox and only for the parent
document of a page with frames or iframes.
See “Using the AIRAliases.js file” on page 985.
Window.nativeWindow property The nativeWindow property provides a reference to the underlying native window
object. With this property, you can script window functions and properties such as screen position, size, and visibility,
and handle window events such as closing, resizing, and moving. For example, the following statement closes the
window:
window.nativeWindow.close();
Note: The window control features provided by the NativeWindow object overlap the features provided by the JavaScript
Window object. In such cases, you can use whichever method you find most convenient.
The window.nativeWindow property is only defined for content within the application sandbox and only for the
parent document of a page with frames or iframes.
Last updated 6/6/2012
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