An AngulaJS directive to force uppercase in input

capitalize.js

angular.module('myApp')
.directive('capitalize', function () {
	return {
		require: 'ngModel',
		link: function(scope, element, attrs, modelCtrl) {
			var capitalize = function(inputValue) {
				if(angular.isDefined(inputValue)) {
					var capitalized = inputValue.toUpperCase();
					if(capitalized !== inputValue) {
						modelCtrl.$setViewValue(capitalized);
						modelCtrl.$render();
					}
					return capitalized;
				}
			}
			modelCtrl.$parsers.push(capitalize);
			capitalize(scope[attrs.ngModel]);  // capitalize initial value
		}
	};
});