Question

有人可以帮我解决这个问题。事实上，我正在尝试注册新用户，在创建新用户之前，我必须检查用户名是否存在。以下是用于此的工厂。

.factory('accountService', function($resource, sessionService) {
    var service = {};
    service.register = function(account, success, failure) {
        if (success (service.userExists(account))){
            failure();
        } else {
            var Account = $resource("/Test/rest/account/student");
            Account.save({}, account, success, failure);
        }            
    };

    service.userExists = function(account, success, failure) {
        var Account = $resource("/Test/rest/account");
        var data = Account.get({
                username : account.username,
                password : account.password
            }, function() {
                var accounts = data.username;
                if (accounts && accounts.length !== 0) {
                    service.data = data;
                    success(account);
                } else {
                    failure();
                }
            }, failure);
    };

    service.getuser = function() {
        return service.data;
    };

    return service;
})

但是当我运行它时，我收到此错误消息：

TypeError：成功不是函数

下面的

是使用此工厂的控制器

.controller(
            "RegisterController",
            function($scope, sessionService, $state, accountService) {
                $scope.register = function() {
                    accountService.register($scope.account, function(
                            returnedata) {
                        sessionService.login($scope.account).then(
                                function() {
                                    $state.go("home");
                                });
                    }, function() {
                        $scope.registererror = function() {
                        }
                    });
                };
            })

Answer 1

我怀疑错误在这一行

service.userExists（帐户）

您的方法签名是

service.userExists = function（account，success，failure）

所以你称之为＆＃34;成功＆＃34;在这种情况下将是未定义的这条线在＆＃34; service.userExists＆＃34;

中

成功（帐户）

抛出错误

这里重写了大致如何避免此错误的示例，有关更改的说明。我们需要区分失败和用户存在，我只是在＆＃34;成功＆＃34;中更改了returnData。为了一个例子，为了真/假。

.factory('accountService', function($resource, sessionService) {
var service = {};
service.register = function(account, success, failure) {
  service.userExists(account), function(answer){
       if (answer){
           success();
       } else {
           var Account = $resource("/Test/rest/account/student");
           Account.save({}, account, success, failure);
       }
  }, failure);        
};

service.userExists = function(account, success, failure) {
    var Account = $resource("/Test/rest/account");
    var data = Account.get({
            username : account.username,
            password : account.password
        }, function() {
            var accounts = data.username;
            if (accounts && accounts.length !== 0) {
                service.data = data;
                success(true);
            } else {
                success(false);
            }
        }, failure);
};

service.getuser = function() {
    return service.data;
};

return service;

}）

Answer 2

service.userExists = function(account, success, failure)

...

if (success (service.userExists(account)))

只用一个参数调用3方法参数。

Answer 3

 if (success (service.userExists(account)))

这里脚本想要调用函数success（param）。所以你必须定义success（）方法，或者你需要通过另一种方式来检查它。它应该看起来像

if(service.userExists(account)){ 
  failure(); //also needs to be defined!
} else{
  var Account = $resource("/Test/rest/account/student");
  Account.save({}, account, success, failure);
}

你真的需要照顾你所说的 - ＆gt;

var test = "hello";
console.log(test); //-> prints "hello"

var test = function(){
  console.log("hello")
}
console.log(test); //-> prints sth. like "function()....."
console.log(test()); //-> prints "hello"

Answer 4

.factory(
            'accountService',
            function($resource, sessionService) {
                var service = {};
                service.register = function(account, success, failure) {
                    service
                            .validUserName(
                                    account,
                                    function(answer) {
                                        if (answer) {
                                            console.log(answer);
                                            failure();
                                        } else {
                                            var Account = $resource("/Test/rest/account/student");
                                            Account.save({}, account,
                                                    success, failure);
                                        }
                                    }, failure);
                };
                service.userExists = function(account, success, failure) {
                    var Account = $resource("/Test/rest/account");
                    var data = Account.get({
                        username : account.username,
                        password : account.password
                    }, function() {
                        console.log("user details : ", data);
                        var accounts = data.username;
                        if (accounts && accounts.length !== 0) {
                            service.data = data;
                            success(account);
                        } else {
                            failure();
                        }
                    }, failure);
                };
                service.validUserName = function(account, success, failure) {
                    var Account = $resource("/Test/rest/account/user");
                    var data = Account.get({
                        username : account.username
                    }, function() {
                        var accounts = data.username;
                        if (accounts && accounts.length !== 0) {
                            service.data = data;
                            success(true);
                        } else {
                            success(false);
                        }
                    }, failure);
                };
                service.getuser = function() {
                    return service.data;
                };
                return service;
            })

和控制器：

.controller(
            "RegisterController",
            function($scope, sessionService, $state, accountService) {
                $scope.register = function() {
                    accountService.register($scope.account, function(
                            returnedata) {
                        accountService.userExists($scope.account, function(
                                account) {
                            sessionService.login($scope.account).then(
                                    function() {
                                        $state.go("get_started");
                                    });
                        });

                    }, function() {
                        $scope.registererror = function() {
                        }
                    });
                };
            });

TypeError：success不是函数

4 个答案: