jQuery addClass example

Change class name on click in jQuery

HTML

<div id="slickQuiz">
    <h1 class="quizName"></h1>
    <div class="quizArea">
        <div class="quizHeader">
            <a class="startQuiz" href="">Get Started!</a>
        </div>
    </div>
    <div class="quizResults">
        <h3 class="quizScore">You Scored: <span></span></h3>
        <h3 class="quizLevel"><strong>Ranking:</strong> <span></span></h3>
        <div class="quizResultsCopy"></div>
    </div>
</div>

CSS

/* BASE QUIZ STYLES */
/* These styles ensure that the necessary elements are hidden for toggling */

/* DO NOT EDIT UNLESS YOU KNOW WHAT YOU ARE DOING!! */

.startQuiz,
.nextQuestion,
.backToQuestion,
.questions li.question,
.questions li.question .responses,
.questions li.question .responses .correct,
.questions li.question .responses .incorrect,
.quizResults {
    display: none;
}

/* If response messages are disabled or only shown on quiz completion,
   nextQuestion button IS checkAnswer button - so it must be displayed */
.nextQuestion.checkAnswer {
    display: block;
}

ol.questions,
ul.answers,
ul.responses,
ol.questions li,
ul.answers li,
ul.responses li {
    list-style-type: none;
}

/* Accessibility */
.quizName span:first-child {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}

/* QUIZ STYLES */
/* Styles to prettify the quiz page */

html {
    background: #eee;
}

body {
    width: 800px;
    margin: 0 auto;
    border: 2px solid #ccc;
    border-top: none;
    background: #fff;
    padding: 20px;
    font-family: Trebuchet, Arial,Helvetica,sans-serif;
    font-size: 16px;
    color: #353535;
    line-height: 1.5em;
}

h1,h2,h3,h4,h5,h6 {font-weight: bold;}

h1 {
    font-size: 26px;
    margin: 0 0 20px;
    color: #0C4569;
}
h2 {
    font-size: 22px;
    margin: 15px 0;
}
h3 {
    font-size: 18px;
    margin: 15px 0 10px;
}
h4 {
    font-size: 16px;
    margin: 10px 0;
}
h5 {
    font-size: 14px;
    margin: 10px 0 5px;
}
h6 {
    font-size: 12px;
    margin: 5px 0;
}

strong { font-weight: bold; }
em { font-style: italic; }
ul { list-style-type: circle; }
ol { list-style-type: decimal; }
ol li { list-style-type: decimal; margin-left: 20px; }

.button {
    float: left;
    width: auto;
    padding: 5px 15px;
    color:#ffffff;
    background-color:darkcyan;
    border: 1px solid #fff;
    -webkit-border-radius: 5px;
    -moz-border-radius:...

JavaScript

/*!
 * SlickQuiz jQuery Plugin
 * https://github.com/jewlofthelotus/SlickQuiz
 *
 * @updated October 25, 2014
 * @version 1.5.20
 *
 * @author Julie Cameron - http://www.juliecameron.com
 * @copyright (c) 2013 Quicken Loans - http://www.quickenloans.com
 * @license MIT
 */

(function($){
    $.slickQuiz = function(element, options) {
        var plugin   = this,
            $element = $(element),
            _element = '#' + $element.attr('id'),

            defaults = {
                checkAnswerText:  'Check My Answer!',
                nextQuestionText: 'Next &raquo;',
                backButtonText: '',
                completeQuizText: '',
                tryAgainText: '',
                questionCountText: 'Question %current of %total',
                preventUnansweredText: 'You must select at least one answer.',
                questionTemplateText:  '%count. %text',
                scoreTemplateText: '%score / %total',
                nameTemplateText:  '<span>Quiz: </span>%name',
                skipStartButton: false,
                numberOfQuestions: null,
                randomSortQuestions: false,
                randomSortAnswers: false,
                preventUnanswered: false,
                disableScore: false,
                disableRanking: false,
                scoreAsPercentage: false,
                perQuestionResponseMessaging: true,
                perQuestionResponseAnswers: false,
                completionResponseMessaging: false,
                displayQuestionCount: true,   // Deprecate?
                displayQuestionNumber: true,  // Deprecate?
                animationCallbacks: { // only for the methods that have jQuery animations offering callback
                    setupQuiz: function () {},
                    startQuiz: function () {},
                    resetQuiz: function () {},
                    checkAnswer: function () {},
                    nextQuestion: function () {},
                    backToQuestion:...