AngularJS Example:

HTML

<form ng-controller="ctrl" ng-app>
  <div>
      <input type="number" ng-model="num" min="1" max="5" />
      <input type="range"  ng-model="num" min="1" max="5" />
  </div>
  <div>
      <input type="number" ng-model="num" min="1" max="5" />
      <input type="range"  ng-model="num" min="1" max="5" />
  </div>
</form>

JavaScript

function ctrl($scope) {
    $scope.num=1;
    $scope.$watch('num', function() {
        $scope.num = parseInt($scope.num);
    });
}