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QuestionJavaScript: Need help understanding what's happening in this loop. Pin
durango7724-Apr-09 13:38
durango7724-Apr-09 13:38 
I want to use a script on my website that scores a multiple choice test, and what I have works pretty well. Before I use this script I want to make sure I understand everything it's doing. I understand most of what is happening, but I don't understand this particular loop:
for (i = 0; i < numberOfQuestions; i++) {
    currentElt = i * numberOfChoices;
    for (j = 0; j < numberOfChoices; j++) {
        currentSelection = form.elements[currentElt + j];
        if (currentSelection.checked) {
            if (currentSelection.value == correctAnswers[i]) {
                numberCorrect++;
                break;
            }
        }
    }
}


I understand that the first for loop is running through each question, but what is currentElt and why is it equal to the question times the number of answers? What is the second for loop doing with the numberOfChoices variable. The full script is below:
<script type="text/javascript">
        /*<![CDATA[*/
        var numberOfQuestions = 10;
        var numberOfChoices = 4;
        var correctAnswers = new Array(10);
        correctAnswers = ["a", "b", "b", "a", "d", "a", "b", "b", "a", "c"];
        function scoreQuiz(form) {
            if (outOfTime == true) {
                window.alert("You have exceeded the time limit of the test." + "\n" + "Please try again.");
                return true;
            }
            var numberCorrect = 0;
            var currentElt;
            var currentSelection;
            for (i = 0; i < numberOfQuestions; i++) {
                currentElt = i * numberOfChoices;
                for (j = 0; j < numberOfChoices; j++) {
                    currentSelection = form.elements[currentElt + j];
                    if (currentSelection.checked) {
                        if (currentSelection.value == correctAnswers[i]) {
                            numberCorrect++;
                            break;
                        }
                    }
                }
            }
            form.correct.value = numberCorrect;
            form.percentage.value = ((numberCorrect / numberOfQuestions) * 100) + "%";
        }
        var remainingTime = 600000;
        var outOfTime = false;
        function timeLeft() {
            if (remainingTime <= 0) {
                outOfTime = true;
            }
            else {
                setTimeout("timeLeft()", (remainingTime));
                remainingTime -= 1;
            }
        }
        /*]]>*/
    </script>

If anyone can help me understand this, or show me a better (simpler?) method of achieving the same thing I would greatly appreciate it.
AnswerRe: JavaScript: Need help understanding what's happening in this loop. Pin
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