How to allow only a number (digits) to be typed in an input?

DEMO – – jsFiddle

Directive

   .directive('onlyNum', function() {
      return function(scope, element, attrs) {

         var keyCode = [8,9,37,39,48,49,50,51,52,53,54,55,56,57,96,97,98,99,100,101,102,103,104,105,110];
          element.bind("keydown", function(event) {
            console.log($.inArray(event.which,keyCode));
            if($.inArray(event.which,keyCode) == -1) {
                scope.$apply(function(){
                    scope.$eval(attrs.onlyNum);
                    event.preventDefault();
                });
                event.preventDefault();
            }

        });
     };
  });

HTML

 <input type="number" only-num>

HTML

 <input type="text" name="number" only-digits>

// Just type 123

  .directive('onlyDigits', function () {
    return {
      require: 'ngModel',
      restrict: 'A',
      link: function (scope, element, attr, ctrl) {
        function inputValue(val) {
          if (val) {
            var digits = val.replace(/[^0-9]/g, '');

            if (digits !== val) {
              ctrl.$setViewValue(digits);
              ctrl.$render();
            }
            return parseInt(digits,10);
          }
          return undefined;
        }            
        ctrl.$parsers.push(inputValue);
      }
    };

// type: 123 or 123.45

 .directive('onlyDigits', function () {
    return {
      require: 'ngModel',
      restrict: 'A',
      link: function (scope, element, attr, ctrl) {
        function inputValue(val) {
          if (val) {
            var digits = val.replace(/[^0-9.]/g, '');

            if (digits !== val) {
              ctrl.$setViewValue(digits);
              ctrl.$render();
            }
            return parseFloat(digits);
          }
          return undefined;
        }            
        ctrl.$parsers.push(inputValue);
      }
    };