我想知道当电子邮件已经存在时是否可以向用户发送某种错误消息。 我有这样的指令。 :指令和控制器之间的通信angularjs
(function() {
angular
.module('app')
.directive('emailNotUsed',emailNotUsed);
emailNotUsed.$inject = ['$http', '$q'];
function emailNotUsed ($http, $q) {
return {
require: 'ngModel',
link: function(scope, element, attrs, ngModel) {
ngModel.$asyncValidators.emailNotUsed = function(modelValue, viewValue) {
return $http.post('/email',viewValue).then(function(response) {
console.log(response);
return response.data == true ? /*$q.reject(response.data.errorMessage)*/ console.log("Show Error Message"): true;
// console.log(response);
});
};
}
};
}
}());
正如你所看到的,这会在控制台中返回Show error。但是可以将这个值传递给寄存器控制器吗?并将值设置为true或false?
(function() {
'use strict';
angular
.module('app')
.controller('RegisterController', RegisterController);
RegisterController.$inject = ['UserService', '$http','$q' ];
function RegisterController(UserService, $http,$q) {
var vm = this;
vm.register = register;
function register() {
vm.dataLoading = true;
UserService.Create(vm.user)
}
}
})();
或者我可以直接给html一个错误消息。
<div class="container" ng-controller="RegisterController as vm">
<div class="col-md-6 col-md-offset-3">
<div ng-show="vm.error" class="alert alert-danger">{{vm.error}}</div>
<form name="form" ng-submit="!form.$pending && form.$valid && vm.register()" role="form">
<div>
<label for="email">Email</label>
<input type="text" name="email" id="email" class="form-control" ng-model="vm.user.email" email-not-used ng-model-options="{ debounce: 500 }" required >
</div>
<div class="form-actions">
<button type="submit" ng-disabled="form.$invalid || vm.dataLoading" class="btn btn-primary">Register</button>
<a href="#/login" class="btn btn-link">Cancel</a>
</div>
</form>
</div>
</div>
我的解决方案
的挣扎后,很多今天我发现我的问题的解决方案。
我将emailNotUsed指令修改为emailValidator。
(function() {
angular
.module('app')
.directive('emailValidator',emailValidator);
emailValidator.$inject = ['$q', '$timeout','$http'];
function emailValidator ($q, $timeout,$http){
return {
require: 'ngModel',
link: function(scope, element, attrs, ngModel) {
ngModel.$asyncValidators.email = function(modelValue, viewValue) {
var deferred = $q.defer();
DoesEmailExist()
function DoesEmailExist() {
$http.post('/email',viewValue).then(function(response) {
if (response.data==true) {
console.log('Email does exist')
deferred.reject();
}else {
deferred.resolve();
}
});
};
console.log(deferred.promise)
return deferred.promise;
};
}
}
}
}());
而且在registration.html我补充这一点:
<div class="form-group" ng-class="{ 'has-error': form.email.$dirty && form.email.$invalid }">
<label for="email"> Email</label>
<input type="text" ng-model="signup.email" ng-model-options="{ debounce: 500 }" name="email" id="email" class="form-control" required email-validator>
<div class="help-block" ng-messages="form.email.$error" ng-if="form.email.$dirty">
<p ng-message="required">Your name is required.</p>
<div ng-message="email" class="help-block" >email already in use</div>
</div>
Plunker [链接](http://plnkr.co/edit/uxVThpBBKVuRLfXjHflQ?p=preview) – MaheshKumar
谢谢,但我已经找到了解决方案,我会将您的答案标记为正确答案,因为它是解决方案中最接近我的答案找到。 – Greg