diff --git a/src/js/uppercaseOnly-directive.js b/src/js/uppercaseOnly-directive.js
index ee07dd5..c4bca73 100644
--- a/src/js/uppercaseOnly-directive.js
+++ b/src/js/uppercaseOnly-directive.js
@@ -1,9 +1,9 @@
 angular.module('focaDirectivas')
-    .directive('uppercaseOnly', [
+    .directive('input', [
         function() {
             return {
-                restrict: 'A',
-                require: 'ngModel',
+                restrict: 'E',
+                require: '?ngModel',
                 link: function(scope, element, attrs, ctrl) {
 
                     function parser(value) {
@@ -19,14 +19,17 @@ angular.module('focaDirectivas')
                     }
 
                     function formatter(value) {
-                        if (ctrl.$isEmpty(value)) {
+                        if (ctrl.$isEmpty(value) || typeof value !== 'string') {
                             return value;
                         }
                         return value.toUpperCase();
                     }
 
-                    ctrl.$formatters.push(formatter);
-                    ctrl.$parsers.push(parser);
+                    if(attrs.type === 'text') {
+    
+                        ctrl.$formatters.push(formatter);
+                        ctrl.$parsers.push(parser);
+                    }
                 }
             };
         }