ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Programming HTML and JavaScript in AIR
Once the runtimeApplicationDomain property is set, the JavaScript context shares class definitions with the
assigned domain. To create an instance of a custom class in JavaScript, reference the class definition through the
window.runtime property and use the new operator:
var customClassObject = new window.runtime.CustomClass();
The HTML content must be from a compatible security domain. If the HTML content is from a different security
domain than that of the application domain you assign, the page uses a default application domain instead. For
example, if you load a remote page from the Internet, you could not assign ApplicationDomain.currentDomain as the
application domain of the page.
Removing event listeners
Adobe AIR 1.0 and later
When you add JavaScript event listeners to objects outside the current page, including runtime objects, objects in
loaded SWF content, and even JavaScript objects running in other pages, you should always remove those event
listeners when the page unloads. Otherwise, the event listener dispatches the event to a handler function that no longer
exists. If this happens, you will see the following error message: “The application attempted to reference a JavaScript
object in an HTML page that is no longer loaded." Removing unneeded event listeners also lets AIR reclaim the
associated memory. For more information, see “Removing event listeners in HTML pages that navigate” on page 1022.
Accessing HTML DOM and JavaScript objects from
ActionScript
Adobe AIR 1.0 and later
Once the HTMLLoader object dispatches the complete event, you can access all the objects in the HTML DOM
(document object model) for the page. Accessible objects include display elements (such as div and p objects in the
page) as well as JavaScript variables and functions. The complete event corresponds to the JavaScript page load event.
Before complete is dispatched, DOM elements, variables, and functions may not have been parsed or created. If
possible, wait for the complete event before accessing the HTML DOM.
For example, consider the following HTML page:
foo = 333;
function test() {
return "OK.";
}
Hi.
This simple HTML page defines a JavaScript variable named foo and a JavaScript function named test(). Both of these
are properties of the global window object of the page. Also, the window.document object includes a named P element
(with the ID p1), which you can access using the getElementById() method. Once the page is loaded (when the
HTMLLoader object dispatches the complete event), you can access each of these objects from ActionScript, as shown
in the following ActionScript code:
Last updated 6/6/2012
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