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              <h1>JS Quiz</h1>
<div class="quiz-wrapper">
  <form id="quiz">
    <div class="quiz-navigation">
      <input type="submit" id="prev" value="prev">
      <input type="submit" id="next" value="next">
    </div>
    <!-- /.quiz-navigation -->
  </form>
  <!-- /#quiz -->

</div>
<!-- /.quiz-wrapper -->
            
          
!
            
              //<link href="https://fonts.googleapis.com/css?family=Fira+Sans:800|Roboto:300" rel="stylesheet"> 
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Roboto', sans-serif;
  font-weight: 300;
  padding-top: 40px;
}
h1, h2, h3, h4, h5, h6 {
  font-family: 'Fira Sans', sans-serif;
  font-weight: 800;
}
h1 {
  text-align: center;
}
.quiz-wrapper {
  margin: 20px auto;
  max-width: 600px;
  padding: 30px 50px;
  border: 1px #000 solid;
}
.answer {
  margin: 10px 0;
  position: relative;
}
.question-wrapper {
  margin-bottom: 50px;
}
.question-wrapper h2 {
  font-size: 20px;
  line-height: 25px;
}
label {
  line-height: 20px;
  vertical-align: middle;
}
button,
input[type="submit"] {
  background-color: transparent;
  border: 1px #000 solid;
  margin: 0 2px;
  padding: 5px 10px;
  cursor: pointer;
}
button:disabled,
input[type="submit"]:disabled {
  background-color: #000;
  color: #fff;
  cursor: initial;
}
input[type="submit"]:disabled {
  background-color: #999;
  border-color: #999;
}
input[type="radio"] + label::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  border: 2px #000 solid;
  padding: 5px;
  border-radius: 50%;
  margin-right: 10px;
  vertical-align: middle;
}
input[type="radio"]:checked + label::before {
  background-color: #000;
  background-clip: content-box;
}
button:focus,
input[type="submit"]:focus,
input[type="radio"]:focus + label::before {
  box-shadow: 0 3px 3px rgba(0,0,200,.5);
}
input[type="radio"] {
  position: absolute;
  visibility: hidden;
}
input,
button {
  font-family: 'Fira Sans', sans-serif;
  font-weight: 800;
}
.result {
  text-align: center;
}
.result button {
  margin-top: 20px;
  padding: 10px 30px;
  font-size: 1.5em;
}
            
          
!
            
              var QuestionsArray = [
  {
    question: 'Entomology is the science that studies:',
    answers: [
      'Behavior of human beings',
      'Insects',
      'The origin and history of technical and scientific terms',
      'The formation of rocks'
    ],
    correctAnswer: 1,
  },
  {
    question: 'Galileo was an Italian astronomer who:',
    answers: [
      'developed the telescope',
      'discovered four satellites of Jupiter',
      'discovered that the movement of pendulum produces a regular time measurement',
      'All of the above'
    ],
    correctAnswer: 3,
  },
  {
    question: 'Exposure to sunlight helps a person improve his health because:',
    answers: [
      'the infrared light kills bacteria in the body',
      'resistance power increases',
      'the pigment cells in the skin get stimulated and produce a healthy tan',
      'the ultraviolet rays convert skin oil into Vitamin D'
    ],
    correctAnswer: 3,
  },
  {
    question: '\'OS\' computer abbreviation usually means:',
    answers: [
      'Order of Significance',
      'Open Software',
      'Operating System',
      'Optical Sensor'
    ],
    correctAnswer: 2,
  },
  {
    question: 'Which scientist discovered the radioactive element radium?',
    answers: [
      'Isaac Newton',
      'Albert Einstein',
      'Benjamin Franklin',
      'Marie Curie'
    ],
    correctAnswer: 3,
  },
  {
    question: 'The great Victoria Desert is located in:',
    answers: [
      'Canada',
      'West Africa',
      'Australia',
      'North America'
    ],
    correctAnswer: 2,
  },
  {
    question: 'Euclid was',
    answers: [
      'Greek mathematician',
      'Contributor to the use of deductive principles of logic as the basis of geometry',
      'Propounded the geometrical theorems',
      'All of the above'
    ],
    correctAnswer: 3,
  },
  {
    question: 'Who invented Dynamite?',
    answers: [
      'Alfred B. Nobel',
      'Sir Alexander Graham Bell',
      'Benjamin Franklin',
      'Thomas Alva Edison'
   
    ],
    correctAnswer: 0,
  }
];
/*
- cały HTML z poziomu JS
*/

var Quiz = function() {
  this.element = document.getElementById('quiz');
  this.navElement = document.getElementsByClassName('quiz-navigation')[0];
  this.quizNav = function QuizNav(navElement, quizElement, quizObj) {
    this.currentQuestion = 0;
    this.nextBtn = document.getElementById('next');
    this.prevBtn = document.getElementById('prev');
    this.numberBtns = [];
    this.showQuestion = function(index) {
      quizObj.questions.forEach(function(q) {
        if (q.position !== index) {
          q.hide();
        }
      });
      quizObj.questions[index].show();
      this.currentQuestion = index;
    };
    this.next = function() {
      this.showQuestion(++this.currentQuestion);
    };
    this.prev = function() {
      this.showQuestion(--this.currentQuestion);
    };
    this.makeNumbers = function() {
      var self = this;
      quizObj.questions.forEach(function(q) {
        var numberBtn = document.createElement('button');
        numberBtn.textContent = q.position + 1;
        numberBtn.addEventListener('click',function() {
          self.showQuestion(q.position);
          self.checkPos();
        });
        self.numberBtns.push(numberBtn);
        navElement.insertBefore(numberBtn,self.nextBtn);

      });
    };
    this.checkPos = function() {
      this.numberBtns.forEach(function(btn) {
        btn.disabled = '';
      });
      this.numberBtns[this.currentQuestion].disabled = true;
      if (this.currentQuestion === 0) {
        this.prevBtn.disabled = true;
      } else {
        this.prevBtn.disabled = '';
      }
      if (this.currentQuestion === (quizObj.questions.length - 1)) {
        this.nextBtn.disabled = true;
        this.endQuizBtn.add();
      } else {
        this.nextBtn.disabled = '';
        this.endQuizBtn.remove();
      }
    };
    this.endQuizBtn = {
      element: document.createElement('button'),
      add: function() {
        var self = this;
        self.element.textContent = 'End quiz';
        navElement.appendChild(self.element);
      },
      remove: function() {
        var self = this;
        if (navElement.lastChild === self.element) {//tutaj pewnie można zrobić lepsze sprawdzenie
          navElement.removeChild(self.element);
        }
      },
      clicked: function() {
        var score = 0;
        quizObj.questions.forEach(function(q) {
          if (q.isAnswerCorrect()) {
            ++score;
          }
        });
        var content = document.createElement('div');
        content.className = 'result';
        var showScore = document.createElement('h2');
        showScore.textContent = 'Your score: ' + score;
        content.appendChild(showScore);
        quizObj.showAnswers();
        navElement.style.display = 'none';
        var tryAgainBtn = document.createElement('button');
        tryAgainBtn.textContent = 'Try again';
        content.appendChild(tryAgainBtn);
        quizElement.appendChild(content);
        tryAgainBtn.addEventListener('click',function() {
            quizObj.reset();
        });
      },
      addEvent: function() {
        var self = this;
        this.element.addEventListener('click',function() {
          self.clicked();
        });
      }
    },
    this.handleEvents = function() {
      var self = this;
      this.nextBtn.addEventListener('click',function() {
        self.next();
        self.checkPos();
      });
      this.prevBtn.addEventListener('click',function() {
        self.prev();
        self.checkPos();
      });
      this.endQuizBtn.addEvent();
    };
  },
  this.quizNavObject = new this.quizNav(this.navElement,this.element,this);
  this.questions = [];
  this.questionElement = function(QuestionObject,parentElement,questionPosition,navElement) {
    this.question = QuestionObject;
    this.position = questionPosition;
    this.element = document.createElement('div');
    this.element.className = 'question-wrapper';
    this.inputs = [];
    this.labels = [];
    this.create = function() {
      var self = this;
      this.element.innerHTML = '<h2>' + (this.position + 1) + '. ' + QuestionObject.question +'</h2>';
      QuestionObject.answers.forEach(function(answer,index) {
        var answerWrapper = document.createElement('div');
        answerWrapper.className = 'answer';
        var input = document.createElement('input');
        input.type = 'radio';
        input.id = questionPosition + '-' + index + '-num';
        input.name = 'question-' + questionPosition;
        input.value = index;
        var label = document.createElement('label');
        label.htmlFor = questionPosition + '-' + index + '-num';
        label.textContent = answer;
        answerWrapper.appendChild(input);
        answerWrapper.appendChild(label);
        self.inputs.push(input);
        self.labels.push(label);
        self.element.appendChild(answerWrapper);
        input.addEventListener('change',function() {
          self.updateAnswer();
        });
      });
    };
    this.answer = null;
    this.updateAnswer = function() {
      //lecę przez wszystkie elementy z tym samym atrybutem name i sprawdzam który zaznaczony
      var self = this;
      this.inputs.forEach(function(input) {
        if (input.checked) {
          self.answer = input.value;
        }
      });
    }
    this.isAnswerCorrect = function() {
      if (this.answer === null) {
        return false;
      }
      return this.question.correctAnswer === Number(this.answer);
    };
    this.showCorrect = function() {
      this.labels[this.question.correctAnswer].style.color = '#090';
    };
    this.hideCorrect = function() {
      this.labels[this.question.correctAnswer].style.color = 'initial';
    };
    this.showUserAnswers = function() {
      if (this.answer) {
        this.labels[this.answer].style.color = '#900';
      }
    };
    this.hideUserAnswers = function() {
      if (this.answer) {
        this.labels[this.answer].style.color = 'initial';
      }
    }
    this.append = function() {
      this.create();
      parentElement.insertBefore(this.element,navElement);
    };
    this.show = function() {
      this.element.style.display = 'block';
    };
    this.hide = function() {
      this.element.style.display = 'none';
    }
  },
  this.makeQuestions = function() {
    var self = this;
    QuestionsArray.forEach(function(q,index) {
      self.questions.push(new self.questionElement(q,self.element,index,self.navElement));
      self.questions[index].append();
    });
  };
  this.init = function() {
    this.makeQuestions();
    this.quizNavObject.showQuestion(0);
    this.quizNavObject.makeNumbers();
    this.quizNavObject.checkPos(this.questions[0]);
    this.quizNavObject.handleEvents();
    this.element.addEventListener('submit',function(e) {
      e.preventDefault();
    });
  };
  this.reset = function() {
    this.questions.forEach(function(q) {
      q.hide();
      q.hideUserAnswers();
      q.hideCorrect();
      q.answer = null;
      q.inputs.forEach(function(inp) {
        inp.disabled = '';
        inp.style.display = 'initial';
        inp.checked = '';
      });
    });
    this.quizNavObject.currentQuestion = 0;
    this.quizNavObject.showQuestion(0);
    this.quizNavObject.checkPos(this.questions[0]);
    var result = document.getElementsByClassName('result')[0];
    this.element.removeChild(result);
    this.navElement.style.display = 'block';
  },
  this.showAnswers = function() {
    this.questions.forEach(function(q) {
      q.show();
      q.showUserAnswers();
      q.showCorrect();
      q.inputs.forEach(function(inp) {
        inp.disabled = true;
        inp.style.display = 'none';
      });
    });
  }
}

var QuizObj = new Quiz();
QuizObj.init();

            
          
!
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