为什么带有 ui-router 的 AngularJS 不断触发 $stateChangeStart 事件?

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问题描述

我正在尝试阻止所有 ui-router 状态更改，直到我对用户进行身份验证为止:

I'm trying to block all ui-router state changes until I've authenticated the user:

$rootScope.$on('$stateChangeStart', function (event, next, toParams) {
  if (!authenticated) {
    event.preventDefault()
    //following $timeout is emulating a backend $http.get('/auth/') request
    $timeout(function() {
      authenticated = true
      $state.go(next,toParams)
    },1000)
  }
})

在用户通过身份验证之前，我拒绝所有状态更改，但是如果我转到使用 otherwise() 配置的无效 URL，我会收到一个带有消息的无限循环:

I reject all state changes until the user has been authenticated, but if I go to an invalid URL that uses the otherwise() configuration, I get an infinite loop with a message:

Error: [$rootScope:infdig] 10 $digest() iterations reached. Aborting!
Watchers fired in the last 5 iterations: [["fn: $locationWatch; newVal: 7; oldVal: 6"],["fn: $locationWatch; newVal: 8; oldVal: 7"],["fn: $locationWatch; newVal: 9; oldVal: 8"],["fn: $locationWatch; newVal: 10; oldVal: 9"],["fn: $locationWatch; newVal: 11; oldVal: 10"]]

下面是我的 SSCCE.使用 python -m SimpleHTTPServer 7070 提供它并转到 localhost:7070/test.html#/bar 以查看它在您的脸上爆炸.而直接导航到唯一有效的 angularjs 位置不会炸毁 localhost:7070/test.html#/foo:

Below is my SSCCE. Serve it up with python -m SimpleHTTPServer 7070 and go to localhost:7070/test.html#/bar to see it explode in your face. Whereas directly navigating to the only valid angularjs location does not blow up localhost:7070/test.html#/foo:

<!doctype html>
  <head>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.js"></script>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.10/angular-ui-router.min.js"></script>
  </head>
  <body ng-app="clientApp">
    <div ui-view="" ></div>

    <script>
      var app = angular.module('clientApp', ['ui.router'])

      var myRouteProvider = [
                '$stateProvider', '$urlRouterProvider',
        function($stateProvider,   $urlRouterProvider) {
          $urlRouterProvider.otherwise('/foo');
          $stateProvider.state('/foo', {
            url: '/foo',
            template: '<div>In Foo now</div>',
            reloadOnSearch: false
          })
        }]
      app.config(myRouteProvider)

      var authenticated = false
      app.run([
                 '$rootScope', '$log','$state','$timeout',
        function ($rootScope,   $log,  $state,  $timeout) {
          $rootScope.$on('$stateChangeStart', function (event, next, toParams) {
            if (!authenticated) {
              event.preventDefault()
              //following $timeout is emulating a backend $http.get('/auth/') request
              $timeout(function() {
                authenticated = true
                $state.go(next,toParams)
              },1000)
            }
          })
        }
      ])
    </script>
  </body>
</html>

我应该使用替代方法来完成此身份验证阻止吗?我确实意识到这种身份验证阻塞只是客户端.在这个例子中，我没有展示服务器端的东西.

Is there an alternative method I should use to accomplish this authentication blocking? I do realize this authentication blocking is client side only. I'm not showing the server side of things in this example.

推荐答案

Fakeout.这是 $urlRouterProvider 和 $stateProvider 之间的交互问题.我不应该为我的 otherwise 使用 $urlRouterProvider.我应该使用类似的东西:

Fakeout. This is an interaction issue between $urlRouterProvider and $stateProvider. I shouldn't be using $urlRouterProvider for my otherwise. I should be using something like:

$stateProvider.state("otherwise", {
    url: "*path",
    template: "Invalid Location",
    controller: [
              '$timeout','$state',
      function($timeout,  $state ) {
        $timeout(function() {
          $state.go('/foo')
        },2000)
      }]
});

甚至是一个透明的重定向:

Or even a transparent'ish redirect:

$stateProvider.state("otherwise", {
    url: "*path",
    template: "",
    controller: [
              '$state',
      function($state) {
        $state.go('/foo')
      }]
});

现在:

<!doctype html>
  <head>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.js"></script>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.10/angular-ui-router.min.js"></script>
  </head>
  <body ng-app="clientApp">
    <div ui-view="" ></div>

    <script>
      var app = angular.module('clientApp', ['ui.router'])

      var myRouteProvider = [
                '$stateProvider',
        function($stateProvider) {

          $stateProvider.state('/foo', {
            url: '/foo',
            template: '<div>In Foo now</div>',
            reloadOnSearch: false
          })

          $stateProvider.state("otherwise", {
              url: "*path",
              template: "",
              controller: [
                        '$state',
                function($state) {
                  $state.go('/foo')
                }]
          });
        }]
      app.config(myRouteProvider)

      var authenticated = false
      app.run([
                 '$rootScope', '$log','$state','$timeout',
        function ($rootScope,   $log,  $state,  $timeout) {
          $rootScope.$on('$stateChangeStart', function (event, next, toParams) {
            if (!authenticated) {
              event.preventDefault()
              //following $timeout is emulating a backend $http.get('/auth/') request
              $timeout(function() {
                authenticated = true
                $state.go(next,toParams)
              },1000)
            }
          })
        }
      ])
    </script>
  </body>
</html>

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