ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Programming HTML and JavaScript in AIR
var interface = {};
interface.calculatePrice = function(){
return ".45 cents";
}
interface.storeID = "abc"
window.childSandboxBridge = interface;
If this child content was loaded into an iframe assigned an id of “child”, you could access the interface from parent
content by reading the childSandboxBridge property of the frame:
var childInterface = document.getElementById("child").contentWindow.childSandboxBridge;
air.trace(childInterface.calculatePrice()); //traces ".45 cents"
air.trace(childInterface.storeID)); //traces "abc"
Establishing a parent sandbox bridge
Adobe AIR 1.0 and later
The parentSandboxBridge property allows the parent document to expose an interface to content in a child
document. To expose an interface, the parent document sets the parentSandbox property of the child document to a
function or object defined in the parent document. You can then access the object or function from content in the
child. The following example shows how a script running in a parent frame can expose an object containing a function
to a child document:
var interface = {};
interface.save = function(text){
var saveFile = air.File("app-storage:/save.txt");
//write text to file
}
document.getElementById("child").contentWindow.parentSandboxBridge = interface;
Using this interface, content in the child frame could save text to a file named save.txt, but would not have any other
access to the file system. The child content could call the save function as follows:
var textToSave = "A string.";
window.parentSandboxBridge.save(textToSave);
Application content should expose the narrowest interface possible to other sandboxes. Non-application content
should be considered inherently untrustworthy since it may be subject to accidental or malicious code injection. You
must put appropriate safeguards in place to prevent misuse of the interface you expose through the parent sandbox
bridge.
Accessing a parent sandbox bridge during page loading
Adobe AIR 1.0 and later
In order for a script in a child document to access a parent sandbox bridge, the bridge must be set up before the script
is run. Window, frame and iframe objects dispatch a dominitialize event when a new page DOM has been created,
but before any scripts have been parsed, or DOM elements added. You can use the dominitialize event to establish
the bridge early enough in the page construction sequence that all scripts in the child document can access it.
The following example illustrates how to create a parent sandbox bridge in response to the dominitialize event
dispatched from the child frame:
Last updated 6/6/2012
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