feat(services): bind enter key when scaling a service (#1560)

app/directives/onEnterKey.js

@@ -0,0 +1,18 @@
+angular.module('portainer')
+.directive('onEnterKey', [function porOnEnterKey() {
+  var directive = {
+    restrict: 'A',
+    link: function(scope, element, attrs) {
+      element.bind('keydown keypress', function (e) {
+        if ( e.which === 13 ) {
+          e.preventDefault();
+          scope.$apply(function () {
+            scope.$eval(attrs.onEnterKey);
+          });
+        }
+      });
+    }
+  };
+
+  return directive;
+}]);