Question

尝试使AngularJS指令有效，我正在学习本教程：http://sahatyalkabov.com/create-a-tv-show-tracker-using-angularjs-nodejs-and-mongodb/

在注册表单中，名为repeat-password的指令检查表单中输入的两封电子邮件是否对应：

<div class="form-group" ng-class="{ 'has-success' : signupForm.confirmPassword.$valid && signupForm.confirmPassword.$dirty, 'has-error' : signupForm.confirmPassword.$invalid && signupForm.confirmPassword.$dirty }">
    <input class="form-control input-lg" type="password" name="confirmPassword" ng-model="confirmPassword" repeat-password="password" placeholder="Confirm Password" required>

    <div class="help-block text-danger my-special-animation" ng-if="signupForm.confirmPassword.$dirty"ng-messages="signupForm.confirmPassword.$error">
       <div ng-message="required">You must confirm password.</div>
       <div ng-message="repeat">Passwords do not match.</div>
    </div>
 </div>

 <button type="submit" ng-disabled="signupForm.$invalid" class="btn btn-lg btn-block btn-primary">Create Account</button>

html的必需部分有效，但不是重复密码部分，没有显示错误信息，它不会阻止我提交表单，我也会直接路由到提交按钮所在的位置。我用于指令本身的代码如下：

angular.module("MyApp")
    .directive("repeatPassword", function () {
        return {
            require: "ngModel",
            link: function (scope, elem, attrs, ctrl) {
                var otherInput = elem.inheritedData("$formController")[attrs.repeatPassword];
                ctrl.$parsers.push(function (value) {
                    if (value === otherInput.$viewValue) {
                        ctrl.$setValidity("repeat", true);
                        return value;
                    }
                    ctrl.$setValidity("repeat", false);
                });
                otherInput.$parsers.push(function (value) {
                    ctrl.$setValidity("repeat", value === ctrl.$viewValue);
                    return value;
                });
            }
        };
    });

我不知道它是否有用，但我使用的是AngularJS v1.3.0-beta.15和Angular-ui.router 0.2.10。

Answer 1

这是fieldMatch指令的通用版本，其中包含对其他SO问题的注释和引用。它已经过1.2和1.3-beta测试。

.directive('fieldMatch', function () {
    return {
        restrict: 'A',
        scope: true,
        require: 'ngModel',
        link: function (scope, elem, attrs, ngModel) {
            var checkFieldMatch = function () {
                // WARNING - FIXME:
                // when a validator fails (returns false), then the underlying model value is set to undefined
                //
                // https://stackoverflow.com/questions/24692775
                // https://stackoverflow.com/questions/24385104
                //
                // => solution: use ngModel.$viewValue instead of ngModel.$modelValue

                var fieldMatch = scope.$eval(attrs.dsFieldMatch),
                    value = ngModel.$modelValue || ngModel.$viewValue;

                // If fieldMatch or ngModel.$viewValue is defined,
                // they should match
                if (fieldMatch || value) {
                    return fieldMatch === value;
                }
                return true;
            };

            scope.$watch(checkFieldMatch, function (n) {
                //set the form control to valid if both
                //passwords are the same, else invalid
                ngModel.$setValidity('fieldMatch', n);
            });
        }
    };
});

请参阅以下其他两个问题：

Angularjs setValidity causing modelValue to not update

Password matching in AngularJS using the $validators pipeline produces unexpected results

angularjs指令检查密码已重复不起作用

1 个答案: