Только цифры в input

directive.number.js

angular.module('myApp', []).directive('numbersOnly', function(){
   return {
     require: 'ngModel',
     link: function(scope, element, attrs, modelCtrl) {
       modelCtrl.$parsers.push(function (inputValue) {
           if (inputValue == undefined) return '' 
           var transformedInput = inputValue.replace(/[^0-9]/g, ''); 
           if (transformedInput!=inputValue) {
              modelCtrl.$setViewValue(transformedInput);
              modelCtrl.$render();
           }
           return transformedInput;         
       });
     }
   };
});