User Guide

setInterval() 733

If you work with setInterval() within classes, you need to be sure to use the this keyword

when you call the function. The

setInterval() function does not have access to class members

if you do not use the keyword. This is illustrated in the following example. For a FLA file with a

button called

deleteUser_btn, add the following ActionScript to Frame 1:

var me:User = new User("Gary");

this.deleteUser_btn.onRelease = function() {

trace("Goodbye, "+me.username);

delete me;

};

Then create a FLA in the same directory called User.as. Enter the following ActionScript:

class User {

var intervalID:Number;

var username:String;

function User(param_username:String) {

trace("Welcome, "+param_username);

this.username = param_username;

this.intervalID = setInterval(this, "traceUsername", 1000, this.username);

}

function traceUsername(str:String) {

trace(this.username+" is "+getTimer()/1000+" seconds old, happy

birthday.");

}