MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH - Page 668

668 Working with External Data
The following sections contain examples that use the External API:
■ “Creating interaction with the External API” on page 668
■ “Controlling Flash Video with the External API” on page 671
Creating interaction with the External API
You can create interaction between the browser and a SWF file that’s embedded on a web
page. The following procedure sends text to the HTML page that contains the SWF file, and
the HTML sends a message back to the SWF file at runtime.
To create the Flash application:
1. Create a new Flash document and save it as extint.fla.
2. Drag two TextInput components onto the Stage and give them instance names of in_ti
and out_ti.
3. Drag a Label component onto the Stage, assign it an instance name of out_lbl, position it
above the
out_ti TextInput instance, and set the text property in the Parameters tab of the
Property inspector to Sending to JS:.
4. Drag a Button component onto the Stage, position it next to the out_lbl label, and give
it an instance name of send_button.
5. Drag a Label component onto the Stage, assign it an instance name of in_lbl, position it
above the
in_ti TextInput instance, and set its text property in the Parameters tab to
Receiving from JS:.
6. Add the following ActionScript to Frame 1 of the main Timeline:
import flash.external.ExternalInterface;
ExternalInterface.addCallback("asFunc", this, asFunc);
function asFunc(str:String):Void {
in_ti.text = "JS > Hello " + str;
}
send_button.addEventListener("click", clickListener);
function clickListener(eventObj:Object):Void {
trace("click > " + out_ti.text);
ExternalInterface.call("jsFunc", out_ti.text);
}