Adam Adam - 1 year ago 63
JSON Question

I keep getting random undefined values back from Json

Hi hopefully someone can help me with this - probably something simple I am overlooking.

I keep getting undefined values randomly - the correct value appears sometimes and sometimes i get the "undefined".

I have tried changing

var q1;
var q1 = '';
etc. and although this stops the undefined value i then get a random blank value.

Any ideas? Thanks in advance :)

$(document).ready(function() {

var questionNumber = 0;
var questionBank = new Array();
var stage = "#game1";
var stage2 = new Object;
var questionLock = false;
var numberOfQuestions;
var score = 0;

$.getJSON('activity.json', function(data) {

for (i = 0; i < data.quizlist.length; i++) {
questionBank[i] = new Array;
questionBank[i][0] = data.quizlist[i].question;
questionBank[i][1] = data.quizlist[i].option1;
questionBank[i][2] = data.quizlist[i].option2;
questionBank[i][3] = data.quizlist[i].option3;
questionBank[i][4] = data.quizlist[i].option4;
numberOfQuestions = questionBank.length;

}) //gtjson

function displayQuestion() {
var rnd = Math.random() * 4;
rnd = Math.ceil(rnd);
var q1;
var q2;
var q3;
var q4;

if (rnd == 1) {
q1 = questionBank[questionNumber][1];
q2 = questionBank[questionNumber][2];
q3 = questionBank[questionNumber][3];
q4 = questionBank[questionNumber][4];
if (rnd == 2) {
q2 = questionBank[questionNumber][1];
q3 = questionBank[questionNumber][2];
q4 = questionBank[questionNumber][3];
q1 = questionBank[questionNumber][4];
if (rnd == 3) {
q3 = questionBank[questionNumber][1];
q4 = questionBank[questionNumber][2];
q1 = questionBank[questionNumber][3];
q3 = questionBank[questionNumber][4];
if (rnd == 4) {
q4 = questionBank[questionNumber][1];
q1 = questionBank[questionNumber][2];
q2 = questionBank[questionNumber][3];
q3 = questionBank[questionNumber][4];

$(stage).append('<div class="questionText">' + questionBank[questionNumber][0] + '</div><div id="1" class="option">' + q1 + '</div><div id="2" class="option">' + q2 + '</div><div id="3" class="option">' + q3 + '</div><div id="4" class="option">' + q4 + '</div>');

$('.option').click(function() {
if (questionLock == false) {
questionLock = true;
//correct answer
if ( == rnd) {
$(stage).append('<div class="feedback1">CORRECT</div>');
//wrong answer
if ( != rnd) {
$(stage).append('<div class="feedback2">INCORRECT</div>');
setTimeout(function() {
}, 1000);
} //display question

function changeQuestion() {


if (stage == "#game1") {
stage2 = "#game1";
stage = "#game2";
} else {
stage2 = "#game2";
stage = "#game1";

if (questionNumber < numberOfQuestions) {
} else {

"right": "+=800px"
}, "slow", function() {
$(stage2).css('right', '-800px');
"right": "+=800px"
}, "slow", function() {
questionLock = false;
} //change question

function displayFinalSlide() {

$(stage).append('<div class="questionText">You have finished the quiz!<br><br>Total questions: ' + numberOfQuestions + '<br>Correct answers: ' + score + '</div>');

} //display final slide

}); //doc ready



"question":"1. Sam wants to be sure to listen carefully to what the influencee says during an important conversation. What are the correct steps to listen effectively?",
"option1":"Ask questions, listen to the answers, and acknowledge what is said.",
"option2":"Listen for feelings and facts, clarify, and share a personal point of view.",
"option3":"Share a personal point of view, clarify, and ask for feedback.",
"option4":"Use closed questions to get the facts, clarify, and confirm what is said."

"question":"2. A team member tried to convince colleagues that the best course of action to increase team performance was to ask for volunteer coaches to train newer team members. The team member presented plans for the coaching program on three different occasions, but was not able to persuade any colleagues to support the plan. Now, the team member wants to learn more about how others on the team recommend improving performance. What approach will have the most impact to understand how others view the situation?",

"option1":"Meet with the colleagues as a group and ask them to discuss their point of view about the problem and the proposed solution.",
"option2":"Explain that he/she has given up on their ideas and will go along with anything the group is willing to do.",
"option3":"Meet with colleagues as a group and paint a picture of the future if the problem is not addressed immediately.",
"option4":"Suggest that colleagues send their comments and ideas directly to the team member. "

"question":"3. A supervisor explained the reasons for a new procedure and started a discussion with the team. The supervisor said, “I expect you to adopt the new procedure immediately and don’t want us to waste time. If you do this in the next two weeks, I will be able to tell the leadership team that we have met our objective ahead of schedule. If you don’t do this, there could be problems.” Which influencing style did this supervisor use? ",

"option1":"Dominating. The supervisor is pushing the team by putting pressure on the team.",
"option2":"Asserting. The supervisor is describing what she/he wants and pushing the team by explaining his/her reasoning for the proposal.",
"option3":"Storytelling. The supervisor is pulling the team together by presenting a picture of the common elements.",
"option4":"Responding. The supervisor is pulling team members toward the idea by explaining is thinking."

Answer Source

The error is this line:


You have defined q3 twice, but not defined q2 at all.

I'd suggest some more defensive programming so that errors like this are harder to make.

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