ActionScript for Flash MX: The Definitive Guide, Second Edition

This is the Title of the Book, eMatter Edition

Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.

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Chapter 1: A Gentle Introduction for Nonprogrammers

Scripting the Answer Buttons

Our questions are in place, our variables have been initialized, and our frames have

been labeled. If we were to test our movie now, we’d see Question 1 appear with

three answer buttons that do nothing when clicked, and we’d have no way for the

user to get to Question 2. We need to add some code to the answer buttons so that

they will advance the user through the quiz and keep track of answers along the way.

Recall that we named our button instances

choice1_btn, choice2_btn, and choice3_

btn

, as shown in Figure 1-7.

To make the Question 1 buttons store the user’s answer and display the next ques-

tion when pressed, we’ll use the code in Example 1-2.

The code for each button consists of two statements that are executed only when a

mouseclick is detected. In natural language, the code for each button says, “When

the user clicks this button, make a note that he chose answer 1, 2, or 3; then proceed

to Question 2.” Let’s dissect how it works, concentrating on the first button only:

Figure 1-7. The answer buttons

Example 1-2. Question 1 button code

// Code executed when button 1 is pressed.

choice1_btn.onRelease = function ( ) {

this._parent.q1answer = 1;

this._parent.gotoAndStop("q2");

};

// Code executed when ...