如何处理 angular-ui-router 解析中的错误 [英] How to handle error in angular-ui-router's resolve

问题描述

我正在使用 angular-ui-router 的 resolve 在移动到某个状态之前从服务器获取数据.有时对服务器的请求失败，我需要通知用户失败.如果我从控制器调用服务器，我可以放入 then 并在其中调用我的通知服务，以防调用失败.我将调用放在 resolve 中，因为我希望后代状态在它们开始之前等待来自服务器的结果.

I am using angular-ui-router's resolve to get data from server before moving to a state. Sometimes the request to the server fails and I need to inform the user about the failure. If I call the server from the controller, I can put then and call my notification service in it in case the call fails. I put the call to the server in resolve because I want descendant states to wait for the result from the server before they start.

如果对服务器的调用失败，我在哪里可以捕获错误?(我已阅读 文档 但仍不确定如何.另外，我正在寻找一个原因试试这个新的代码片段工具:).

Where can I catch the error in case the call to the server fails? (I have read the documentation but still unsure how. Also, I'm looking for a reason to try out this new snippet tool :).

"use strict";

angular.module('MyApp', ["ui.router"]).config([
  "$stateProvider",
  "$urlRouterProvider",
  function ($stateProvider, $urlRouterProvider) {
    $urlRouterProvider.otherwise("/item");
    $stateProvider
    .state("list", {
      url: "/item",
      template: '<div>{{listvm}}</div>' +
      	'<a ui-sref="list.detail({id:8})">go to child state and trigger resolve</a>' +
        '<ui-view />',
      controller: ["$scope", "$state", function($scope, $state){
          $scope.listvm = { state: $state.current.name };
      }]
    })
    .state("list.detail", {
      url: "/{id}",
      template: '<div>{{detailvm}}</div>',
      resolve: {
        data: ["$q", "$timeout", function ($q, $timeout) {
          var deferred = $q.defer();
          $timeout(function () {
            //deferred.resolve("successful");
            deferred.reject("fail");   // resolve fails here
          }, 2000);
          return deferred.promise;
        }]
      },
      controller: ["$scope", "data", "$state", function ($scope, data, $state) {
        $scope.detailvm = {
          state: $state.current.name,
          data: data
        };
      }]
    });
  }
]);

<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.22/angular.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.10/angular-ui-router.min.js"></script>

<div ng-app="MyApp">
  <ui-view />
</div>

推荐答案

问题是如果路由解析中的任何依赖被拒绝，控制器不会 被实例化.因此，您可以将故障转换为可以在实例化控制器中检测到的数据.

The issue is that if any of the dependencies in the route resolve is rejected, the controller will not be instantiated. So you could convert the failure to data that you can detect in the instantiated controller.

示例伪代码:-

   data: ["$q", "$timeout","$http", function ($q, $timeout, $http) {
      return $timeout(function () { //timeout already returns a promise
        //return "Yes";
        //return success of failure
         return success ? {status:true, data:data} : {status:false}; //return a status from here
       }, 2000);
     }]

在你的控制器中:-

 controller: ["$scope", "data", "$state", function ($scope, data, $state) {
      //If it has failed
      if(!data.status){
        $scope.error = "Some error";
       return;
      }
        $scope.detailvm = {
          state: $state.current.name,
          data: data
        };

如果您正在进行 $http 调用或类似调用，您可以使用 http 承诺来解析数据，即使在失败的情况下也总是会向控制器返回状态.

If you are making an $http call or similar you can make use of http promise to resolve the data always even in case of failure and return a status to the controller.

例子:-

resolve: {
        data: ["$q", "$timeout","$http", function ($q, $timeout, $http) {
           return $http.get("someurl")
             .then(function(){ return {status:true , data: "Yes"} }, 
                    function(){ return {status:false} }); //In case of failure catch it and return a valid data inorder for the controller to get instantated
        }]
      },

"use strict";

angular.module('MyApp', ["ui.router"]).config([
  "$stateProvider",
  "$urlRouterProvider",
  function ($stateProvider, $urlRouterProvider) {
    $urlRouterProvider.otherwise("/item");
    $stateProvider
    .state("list", {
      url: "/item",
      template: '<div>{{error}}</div><div>{{listvm}}</div>' +
      	'<a ui-sref="list.detail({id:8})">go to child state and trigger resolve</a>' +
        '<ui-view />',
      controller: ["$scope", "$state", function($scope, $state){
       $scope.listvm = { state: $state.current.name };
      }]
    })
    .state("list.detail", {
      url: "/{id}",
      template: '<div>{{detailvm}}</div>',
      resolve: {
        data: ["$q", "$timeout","$http", function ($q, $timeout, $http) {
           return $http.get("/").then(function(){ return {status:true , data: "Yes"} }, function(){ return {status:false} })
        }]
      },
      controller: ["$scope", "data", "$state", function ($scope, data, $state) {
   
    
        $scope.detailvm = {
          state: $state.current.name,
          data: data.status ? data :"OOPS Error"
        };
        
      }]
    });
  }
]);

 <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.22/angular.min.js"></script>
    <script data-require="angular-ui-router@*" data-semver="0.2.10" src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.10/angular-ui-router.js"></script>
  <div ng-app="MyApp">
      <ui-view></ui-view>
    </div>

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