Example 13-5. The Multiple-Choice Quiz, One Last Time

// CODE ON FRAME 1 OF THE MAIN TIMELINE
//  Stop the movie
stop( );

//  Init main timeline variables
var displayTotal;               // Text field for user's final score
var totalCorrect = 0;           // Number of questions answered correctly
var userAnswers = new Array( );  // Array containing the user's guesses
var currentQuestion = 0;        // Number of the question the user is on

// Import the source file containing our array of question objects
// See explanation later in this example
#include "questionsArray.as"    

// Begin the quiz
makeQuestion(currentQuestion);

// The Question() constructor
function Question (correctAnswer, questionText, answers) {
  this.correctAnswer = correctAnswer;
  this.questionText = questionText;
  this.answers = answers;
}

// Function to render each question to the screen
function makeQuestion (currentQuestion) {
  // Clear the Stage of the last question
  questionClip.removeMovieClip( );

  // Create and place the main question clip
  attachMovie("questionTemplate", "questionClip", 0);
  questionClip._x = 277;
  questionClip._y = 205;
  questionClip.qNum = "question\n  " + (currentQuestion + 1);
  questionClip.qText = questionsArray[currentQuestion].questionText;

  // Create the individual answer clips in the question clip
  for (var i = 0; i < questionsArray[currentQuestion].answers.length; i++) {
    // Attach our linked answerTemplate clip from the Library;
    // It contains a generalized button and a text field for the question
    questionClip.attachMovie("answerTemplate", "answer" + i, i);
    // Place this answer clip in line below the question
    questionClip["answer" + i]._y += 70 + (i * 15);
    questionClip["answer" + i]._x -= 100;
    // Set the text field in the answer clip to the appropriate element of this
    // question's answer array
    questionClip["answer" + i].answerText =
        questionsArray[currentQuestion].answers[i];
  }
}

// Function to register the user's answers
function answer (choice) {
  userAnswers.push(choice);
  if (currentQuestion + 1 == questionsArray.length) {
    questionClip.removeMovieClip( );
    gotoAndStop ("quizEnd");
  } else {
    makeQuestion(++currentQuestion);
  }
}

// Function to tally the user's score
function gradeUser( ) {
  // Count how many questions the user answered correctly
  for (var i = 0; i < questionsArray.length; i++) {
    if (userAnswers[i] == questionsArray[i].correctAnswer) {
      totalCorrect++;
    }
  }
  // Show the user's score in an onscreen text field
  displayTotal = totalCorrect + "/" + questionsArray.length;
}

// CODE ON THE DYNAMICALLY GENERATED ANSWER BUTTONS
// Answer clips are generated dynamically and named in the series
// "answer0", "answer1",..."answern". Each answer clip contains a
// button that, when clicked, checks the name of the answer clip it's 
// in to determine the user's choice.
on (release) {
  // Trim the prefix "answer" off this clip's name
  choice = _name.slice(6, _name.length);
  _root.answer(choice);
}

// CODE ON THE quizEnd FRAME
gradeUser( );