<div ng-app="coolform" class="wrapper">
  
  <div cool-form>
    <div class="q-title">Join the club!</div>
    <div ng-repeat="q in questions" class="question">
      <label>
        <span class="q-text">
          {{q.question}}
          <span class="q-answer">
            {{q.answer}}
          </span>
        </span>
        <input type="text" id="q{{$index}}" ng-model="q.answer">
        <span class="q-back" ng-click="open($index)"><</span>
      </label>
      <span class="q-next" ng-click="open($index+1)">></span>  
    </div>
    <div class="q-after">
      <hr>
      <div class="q-confirm-text">Is the above information correct?</div>
      <div class="q-confirm-button">Absolutely</div>
    </div>
  </div>
  <center ng-show="activequestion > -1 && activequestion < questions.length">{{activequestion+1}} / {{questions.length}}</center>
  
</div>

* { box-sizing: border-box; position:relative;}

body {
  background: #2D82CB;
  font-family: "lato", sans-serif;
  color: rgba(255,255,255,0.7);
}

#form-wrapper {
  margin-top: 80px;
  height:450px;
  transition: all 1s ease;
  overflow: hidden;
}
#form-wrapper.answering {
  height: 150px;
  overflow: hidden;
}

.question {
  width: 400px;
  margin: 0 auto;
  height: 30px;
  overflow: hidden;
}
.question, .question * {transition: all 0.3s ease;}
.question .q-back {opacity:1;}
.question label {font-size: 20px; padding-left:20px;}
.question input, .question .q-next {display: none;}
.question .q-text {height:30px;line-height:30px;}
.question .q-answer {display:inline; color: rgba(0,0,0,.8);}

.question.open {height: 90px; margin-bottom: 150px;}
.question.open label {font-size: 30px;}
.question.open .q-back {opacity: 0;}
.question.open input {display: block;}
.question.open .q-next {display: block;}
.question.open .q-text {height:40px;line-height:40px;}
.question.open .q-answer {display:none;}

.q-next {
  display: block;
  position: absolute;
  bottom: 5px;
  right:0px;
  padding: 0 10px;
  height: 45px;
  line-height:45px;
  text-align:center;
  font-size: 30px;
  cursor: pointer;
} .q-next:hover {background: rgba(255,255,255,.1);}

.q-back {
  position:absolute;
  top:0px;
  left:0px;
  color:rgba(0,0,0,.8);
  width: 100%;
  cursor: pointer;
  font-size:20px;
  line-height: 30px;
  padding-left: 4px;
} .q-back:hover {background: rgba(255,255,255,.1);}

.q-text {
  max-height: 40px;
  overflow:hidden;
  display:block;
}

label {
  display: block;
  width: 100%;
  height: 100%;
  line-height: 40px;
}

input {
  border: 0px;
  outline: 0;
  box-shadow: 0;
  background: rgba(0,0,0,.15);
  border-bottom: 5px solid rgba(0,0,0,.05);
  color: black;
  width:100%;
  height:50px;
  line-height:50px;
  padding: 0 10px;
  font-size: 30px;
}


.q-title {
  text-align: center;
  line-height: 150px;
  font-size: 40px;
  font-weight: bold;
}

.q-after {
  width: 400px;
  margin: 0 auto;
  overflow: hidden;
  padding: 20px 0;
}
.q-confirm-text {
  font-size: 20px;
  padding: 20px 0;
}
.q-confirm-button {
  transition: all 0.3s ease;
  display: block;
  padding: 0 10px;
  padding-left: 50px;
  height: 40px;
  line-height:40px;
  width: 50%;
  font-size: 20px;
  cursor: pointer;
  background: rgba(255,255,255,.3);
  text-transform: uppercase;
  color: white;
} .q-confirm-button:hover {background: rgba(255,255,255,.1);}
.q-confirm-button:before {
  content: '>';
  display: block;
  position:absolute;
  top: 0px;
  left: 0px;
  width: 40px;
  height: 100%;
  background: rgba(255,255,255,.1);
  text-align:center;
  line-height: 40px;
  font-size: 25px;
  color: white;
}

hr {
  box-shadow: 0px;
  outline: 0px; border:0px;
  height: 1px;
  background: rgba(255,255,255,.2);
}

var coolform = angular.module('coolform', []);
coolform
  .directive('coolForm', function($timeout) {
    var ctrl = function($scope, $element, $attributes) {
      $scope.questions = [];
      $scope.activequestion = -1;
      $scope.answering = true;
      
      $scope.questions.push({'question': 'What\'s your name?'});
      $scope.questions.push({'question': 'How old are you?'});
      $scope.questions.push({'question': 'Where do you live?'});
      
      function removeOpen() {
        for(i=0;i<qs.length;i++){
          angular.element(qs[i]).removeClass('open');
        }
      }
      
      var scrolle = document.getElementById('form-wrapper');
      var qs = document.getElementsByClassName('question');
      
      $scope.open = function(order) {
        removeOpen();
        if (order >= $scope.questions.length || order < 0) {
          $scope.answering = false;
          if ($element.hasClass('answering')) {
            $element.removeClass('answering');
            $scope.activequestion = $scope.questions.length+1;
          }
        } else {
          $scope.answering = true;
          if (!$element.hasClass('answering')) {
            $element.addClass('answering');
          }
          //document.activeElement.blur();
          $scope.activequestion = order;
          var offset = qs[0].offsetTop;
          if(order !== 0) {offset = qs[order-1].offsetTop;}
          scrollToAndFocus(scrolle, offset, 500, order);
          if (!angular.element(qs[order]).hasClass('open')) {
            angular.element(qs[order]).addClass('open');
          }
        }

      }
      
      function scrollToAndFocus(element, to, duration, focus) {
          if (duration <= 10) {
            document.getElementById('q'+(focus)).focus();
            return;
          }
          var difference = to - element.scrollTop;
          var perTick = difference / duration * 10;
          window.setTimeout(function() {
              element.scrollTop = element.scrollTop + perTick;
              if (element.scrollTop === to) return;
              scrollToAndFocus(element, to, duration - 10, focus);
          }, 10);
      }
      
      
      var handler = function(e){
        if(e.keyCode === 37) {
          //left arrow
          e.preventDefault(); 
          $scope.$apply(function() {
            $scope.open($scope.activequestion-1);
          });
        }     
        if(e.keyCode === 39) {
          //right arrow
          e.preventDefault(); 
          $scope.$apply(function() {
            $scope.open($scope.activequestion+1);
          });
        }
        if(e.keyCode === 13) {
          //enter
          e.preventDefault(); 
          $scope.$apply(function() {
            $scope.open($scope.activequestion+1);
          });
        }
        if (e.keyCode == 9) {
          //tab
          e.preventDefault(); 
          $scope.$apply(function() { $scope.open($scope.activequestion+1);
          });
        } 
      };

      
      $element.on('keydown', handler);
      $scope.$on('$destroy',function(){
        $element.off('keydown', handler);
      });
      
      
      setTimeout(function() {
        $scope.activequestion++;
        $scope.$apply(function(){
          $scope.open($scope.activequestion);
        });
      }, 2000);
    };
    return {
      restrict: 'EA',
      replace: true,
      transclude: true,
      link: ctrl,
      template: '<div ng-transclude id="form-wrapper" class="answering"></div>'
    };

  });