finlabsindia/wp-content/plugins/jetpack/modules/shortcodes/js/quiz.js

(function($){
	$.fn.shuffleQuiz = function() {
        var allElems = this.get(),
            getRandom = function(max) {
                return Math.floor(Math.random() * max);
            },
            shuffled = $.map(allElems, function(){
                var random = getRandom(allElems.length),
                    randEl = $(allElems[random]).clone(true)[0];
                allElems.splice(random, 1);
                return randEl;
           });

        this.each(function(i){
            $(this).replaceWith($(shuffled[i]));
        });

        return $(shuffled);
	};
})(jQuery);

jQuery( function( $ ) {
	$( '.jetpack-quiz' ).each( function() {
		var quiz = $(this);
		quiz.find( 'div.jetpack-quiz-answer' ).shuffleQuiz();
		quiz.find( 'div[data-correct]' ).removeAttr( 'data-correct' ).data( 'correct', 1 );
		quiz.find( 'div.jetpack-quiz-answer:last' ).addClass( 'last' );
	});

	$( 'div.jetpack-quiz' ).on( 'click', 'div.jetpack-quiz-answer', function() {
		var trackid, answer = $( this ),
			quiz = answer.closest( 'div.jetpack-quiz' );

		if  ( quiz.data( 'a8ctraining' ) ) {
			new Image().src = '//pixel.wp.com/b.gif?v=wpcom-no-pv&x_trainingchaos-' + quiz.data( 'username' ) + '=' + quiz.data( 'a8ctraining' ) + '&rand=' + Math.random();
			quiz.data( 'a8ctraining', false );
			quiz.data( 'trackid', false );
		}

		trackid = quiz.data( 'trackid' );
		if ( answer.data( 'correct' ) ) {
			answer.addClass( 'correct' );
			if ( trackid ) {
				new Image().src = '//pixel.wp.com/b.gif?v=wpcom-no-pv&x_quiz-' + trackid + '=correct&rand=' + Math.random();
			}
		} else {
			answer.addClass( 'wrong' );
			if ( trackid ) {
				new Image().src = '//pixel.wp.com/b.gif?v=wpcom-no-pv&x_quiz-' + trackid + '=wrong&rand=' + Math.random();
			}
		}
		// only track the first answer
		quiz.data( 'trackid', false );
	});
} );