问题描述

我正在使用 ui.router 在我的 Angular 应用程序中进行路由.有一个典型的登录场景，如果用户没有登录，我会将他重定向到登录 url.没有 ui.router 库，使用 $routeChangeStart 事件结合 $location.path.现在，我正在使用 $stateChangeStart 事件，结合 $state.go，但没有任何效果！它还将我的浏览器发送到无限循环.我从其他来源得知这是一个已知错误，建议的解决方案都不适合我.此外，$location.path 也不会重定向到登录页面.

I'm using ui.router for routing in my Angular app. There is a typical login scenario, where I'm redirecting a user to the login url if he's not logged in. Without the ui.router library, this worked fine using $routeChangeStart event combined with $location.path. Now, I'm using the $stateChangeStart event, combined with $state.go, and the nothing works! It also sends my browser into an infinite loop. I read from other sources that this is a known bug, and none of the suggested solutions work for me. Moreover, $location.path too doesn't redirect to the login page.

这就是我配置路径的方式:

This is how I've configured my paths:

 .config(['$stateProvider', '$urlRouterProvider', function ($stateProvider, $urlRouterProvider) {
    $stateProvider
        .state('main', {
            url: '/',
            templateUrl: 'views/main.html',
            controller: 'MainCtrl'
        })
        .state('about', {
            url: '/about',
            templateUrl: 'views/about.html',
            controller: 'AboutCtrl'
        })
        .state('login', {
            url: '/login',
            templateUrl: 'views/loginform.html',
            controller: 'LoginCtrl'
        });
    $urlRouterProvider.otherwise("/");
}])

还有我的 run 方法:

.run(['$state', '$rootScope', '$location', function($state, $rootScope, $location) {
    //Check when routing starts
    //event, next, current
    $rootScope.$on( '$stateChangeStart', function(e, toState, toParams, fromState, fromParams) {
        //Redirect to login if the user is not logged in
        if (!isUserLoggedIn) {

            //Some suggestion
            //e.preventDefault();
            console.log('Not logged in');

            //Infinite loop, kills my browser!
            $state.go('login');
            $state.transitionTo('login');

            //Some suggestion
            $state.go('login', { url: '/login'});

            //Doesn't work
            $location.path('/login');

            //$location.path( $state.href('login');
            console.log('Redirected');
        }
    });

推荐答案

如果状态 TO 已经是登录"，我们在这里需要的是不要重定向.

What we would need here, is to do NOT redirect, if the state TO is already the 'login'.

只是草拟的调整

$rootScope.$on( '$stateChangeStart', function(e, toState  , toParams
                                               , fromState, fromParams) {

    var isLogin = toState.name === "login";

    if(isLogin){

       return; // no need to redirect anymore 
    }
    ...

而且，我们应该使用 event.preventDefault();

 ...
 // also prevent default on redirect
 $state.go('login');
 event.preventDefault(); 
 ...

请查看此问答A 如何修复超出最大调用堆栈大小"AngularJS和 a plunker 具有类似的解决方案

Please check this Q & A How can I fix 'Maximum call stack size exceeded' AngularJS And a plunker with similiar solution

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