Passing URL variables into Flash using FlashVars and SWFObject - Page 3

ActionScript:

On the Flash side, in order to grab these variables, you use the LoaderInfo Class through the loaderInfo property of a display object, and its parameters property.

For example:

var firstname:String = loaderInfo.parameters.firstname;
var lastname:String = loaderInfo.parameters.lastname;

In Flash, it’s also good idea to make sure that such values exist, i.e., that they are not undefined:

var firstname:String;
var lastname:String;
var number:String;  

if (loaderInfo.parameters.firstname != undefined && loaderInfo.parameters.lastname != undefined && loaderInfo.parameters.number != undefined)
{
    firstname = loaderInfo.parameters.firstname;
    lastname = loaderInfo.parameters.lastname;
    number = loaderInfo.parameters.number;
}
else
{
	// something’s wrong
}

You can show the variables in text fields:

Or you can show an error if one of the variables is missing:

This is the code that should go in the main SWF file, in its document Class (Main.as in the example).
If you have more than one SWF file that you’re loading, and you want to access this variables from an external one, you’ll want to use the stage property:

firstname = stage.loaderInfo.parameters.firstname;

Just do it after the ADDED_TO_STAGE is triggered.
If you want to be safe, always use the stage property. This is required is most applications because you’ll have at least two SWF files: the preloader and the main content.

Here’s the complete example for download.