Capitalized AlphaNumeric Directive

alpha-numeric.js

.directive('onlyAlpha', function(){
   return {
     require: 'ngModel',
     link: function(scope, element, attrs, modelCtrl) {
       modelCtrl.$parsers.push(function (inputValue) {
           if (inputValue == undefined) return '';
           var transformedInput = inputValue.replace(/[\W_]+/g,'').toUpperCase();
           if (transformedInput!=inputValue) {
              modelCtrl.$setViewValue(transformedInput);
              modelCtrl.$render();
           }

           return transformedInput;
       });
     }
   };
})