$on('$stateChangeStart') 内的 Ui-Router $state.go 导致无限循环 [英] Ui-Router $state.go inside $on('$stateChangeStart') is cauzing an infinite loop

问题描述

我正在尝试将登录引入用户在应用程序中导航的方式.

如果该页面满足特定要求，我假装将用户重定向到他在导航到登录页面之前所在的页面

阻止事件从 $stateChangeStart 停止，状态更改如预期，但是当我运行 $state.go('into_somewhere') 时，我进入了一个无限循环

我的 angular 版本是 1.3.1，ui-router 是最新的

.factory('RouteHistory', function ($rootScope,$log, $state, Auth, $urlRouter, $timeout) {//用户进入页面后var currentState = '';//当用户试图访问他没有权限的页面时//或者需要用户登录变量挂起状态 = '';var isMenuTogglerVisible = false;var skipFromStateVal = true;$rootScope.$on('$stateChangeStart', function(event, toState, toParams, fromState, fromParams){event.preventDefault();if (toState.name == '登录' && fromState.name != '登录'){$log.log('Ui-router: 改为登录');//$urlRouter.sync();$state.go('登录')//pendingState = fromState;//$log.log('Peding 状态更新为:' + pendingState.name );//$urlRouter.sync();}if (fromState.name == 'login' && Auth.isLoggedIn()) {$log.log('Ui-router: 从登录开始');//$state.go(fromState.name);$超时(功能(){//$state.go('home', null, {/*reload: true, location: 'replace'*/});$state.go('浏览机器');//$urlRouter.sync();},2000)}$log.log({'toState': toState,'toParams': toParams,'来自状态':来自状态，'fromParams': fromParams})})返回 {};});

解决方案

一般来说，让我们重定向 ($state.go()) 仅在需要时.在其他情况下，从事件侦听器中退出:

if (toState.name === '登录' ){//她/他是否尝试去登录?- 让他/她走返回;}如果(Auth.isLoggedIn()){//登录了吗?- 可以去任何地方返回;}//别的$state.go('登录')

这是简化的逻辑，但表明我们应该仅在需要时更改为执行.还有一些其他示例具有更详细的实现和 plunkers:

• 混淆 $locationChangeSuccess 和 $stateChangeStart
• Angular UI 路由器:home 的嵌套状态以区分登录和注销
• 其他登录示例
• angular ui-router 登录认证

正如评论中所提供的，有 plunker，我像这样改变了这里

<预><代码>...//三个新行if (toState.name === 'specialRoute'){返回;}if (fromState.name=='route1'){event.preventDefault();$state.go('specialRoute')}

这不再是循环了.请在此处

查看

I'm trying to introduce login into the way the user navigates accross the application.

I pretend to redirect the user to the page were he was before he navigate to the login page if that page meets specific requirements

Preventing the event from the $stateChangeStart stop's the state change like expected but when i run the $state.go('into_somewhere') i enter an infinit loop

My angular version is 1.3.1 and the ui-router is the latest

.factory('RouteHistory', function ($rootScope,$log, $state, Auth, $urlRouter, $timeout) {

    // after the user enter a page
    var currentState = '';

    // when the user is trying to access a page that he has not permissions
    // or that requires the user to be logged in
    var pendingState = '';

    var isMenuTogglerVisible = false;
    var skipFromStateVal = true;

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

      event.preventDefault();



      if (toState.name == 'login' && fromState.name != 'login'){
        $log.log('Ui-router: changing to login');
        // $urlRouter.sync();
        $state.go('login')
        //pendingState = fromState;
        //$log.log('Peding state updated to:' + pendingState.name );
        //$urlRouter.sync();
      }

      if (fromState.name == 'login' && Auth.isLoggedIn()) {
        $log.log('Ui-router: going from login');
        //$state.go(fromState.name);
        $timeout(function(){
          // $state.go('home', null, {/*reload: true, location: 'replace'*/});
          $state.go('browse-machine');
          //$urlRouter.sync();
        },2000)
      }



      $log.log({
        'toState': toState,
        'toParams': toParams,
        'fromState': fromState,
        'fromParams': fromParams
      })

    })


    return {

    };
  });

解决方案

In general I would say, let's redirect ($state.go()) only if needed. In other cases, get out from the event listener:

if (toState.name === 'login' ){
  // doe she/he try to go to login? - let him/her go
  return;
}

if(Auth.isLoggedIn()){
   // is logged in? - can go anyhwere
   return;
}

// else
$state.go('login')

This is simplified logic, but shows, that we should change to execution only if needed. There are some other examles with more detailed implementation and plunkers:

• Confusing $locationChangeSuccess and $stateChangeStart
• Angular UI Router: nested states for home to differentiate logged in and logged out
• other example of log in
• angular ui-router login authentication

As provided in the comment, there was plunker, which I changed like this here

...
// three new lines
if (toState.name === 'specialRoute'){
  return;
}

if (fromState.name=='route1'){
  event.preventDefault();
  $state.go('specialRoute')
}

And this is not looping anymore. Please, check it here

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