AngularJS表单验证功能(3)

angular.module('myApp', []).controller('TestController', function($scope) {
  $scope.obj = {
    number: 34
  }
}).directive('ngTest', function() {
  return {
    require: '?ngModel',
    restrict: 'AE',
    link: function($scope, iElm, iAttrs, ngModel) {
      if (!ngModel) return;
      ngModel.$parsers.push(function(viewValue) {
        var num = parseInt(viewValue);
        if (num >= 0 && num < 99) {
          ngModel.$setValidity('test', true);
          return viewValue
        } else {
          ngModel.$setValidity('test', false);
          return undefined
        }
      })
    }
  }
});