AngularJS 在路由更改时中止所有挂起的 $http 请求

问题描述

请先通过代码

app.js

var app = angular.module('Nimbus', ['ngRoute']);

route.js

app.config(function($routeProvider) {
    $routeProvider
    .when('/login', {
        controller: 'LoginController',
        templateUrl: 'templates/pages/login.html',
        title: 'Login'
    })
    .when('/home', {
        controller: 'HomeController',
        templateUrl: 'templates/pages/home.html',
        title: 'Dashboard'
    })
    .when('/stats', {
        controller: 'StatsController',
        templateUrl: 'templates/pages/stats.html',
        title: 'Stats'
    })
}).run( function($q, $rootScope, $location, $route, Auth) {
    $rootScope.$on( "$routeChangeStart", function(event, next, current) {
        console.log("Started");


        /* this line not working */
        var canceler = $q.defer();
        canceler.resolve();

    });

    $rootScope.$on("$routeChangeSuccess", function(currentRoute, previousRoute){
        $rootScope.title = ($route.current.title) ? $route.current.title : 'Welcome';
    });
 })

home-controller.js

home-controller.js

app.controller('HomeController',
    function HomeController($scope, API) {
        API.all(function(response){
            console.log(response);
        })
    }
)

stats-controller.js

stats-controller.js

app.controller('StatsController',
    function StatsController($scope, API) {
        API.all(function(response){
            console.log(response);
        })
    }
)

api.js

app.factory('API', ['$q','$http', function($q, $http) {
    return {
        all: function(callback) {
            var canceler = $q.defer();
            var apiurl = 'some_url'
            $http.get(apiurl,{timeout: canceler.promise}).success(callback);
        }
    }
}]);

当我从家搬到 stats 时，API 会再次发送 http 请求，我有很多这样的 http 调用，我只粘贴了几行代码.

When I move from home to stats , again API will send http request, I have many http calls like this, I pasted only few lines of code.

我需要的是我需要在 routechangestart 或成功时中止所有待处理的 http 请求

What I need is I need to abort all pending http requests on routechangestart or success

或者任何其他实现相同的方式?

Or any other way to implement the same ?

推荐答案

我为此整理了一些概念性代码.它可能需要调整以满足您的需求.有一个 pendingRequests 服务，它有一个 API 用于添加、获取和取消请求，一个 httpService 包装 $http 并确保跟踪所有请求.

I put together some conceptual code for this. It might need tweaking to fit your needs. There's a pendingRequests service that has an API for adding, getting and cancelling requests, a httpService that wraps $http and makes sure all requests are tracked.

通过利用 $http 配置对象(docs)，我们可以获得取消待处理请求的方法.

By leveraging the $http config object (docs) we can get a way to cancel a pending request.

我已经做了一个 plnkr，但是你需要快速的手指才能看到请求被取消，因为我发现的测试站点通常会在半秒内响应，但是你会在 devtools 网络选项卡中看到请求被取消.在您的情况下，您显然会在来自 $routeProvider 的适当事件上触发 cancelAll() 调用.

I've made a plnkr, but you're going to need quick fingers to see requests getting cancelled since the test-site I found typically responds within half a second, but you will see in the devtools network tab that requests do get cancelled. In your case, you would obviously trigger the cancelAll() call on the appropriate events from $routeProvider.

控制器只是为了演示这个概念.

The controller is just there to demonstrate the concept.

演示

angular.module('app', [])
// This service keeps track of pending requests
.service('pendingRequests', function() {
  var pending = [];
  this.get = function() {
    return pending;
  };
  this.add = function(request) {
    pending.push(request);
  };
  this.remove = function(request) {
    pending = _.filter(pending, function(p) {
      return p.url !== request;
    });
  };
  this.cancelAll = function() {
    angular.forEach(pending, function(p) {
      p.canceller.resolve();
    });
    pending.length = 0;
  };
})
// This service wraps $http to make sure pending requests are tracked
.service('httpService', ['$http', '$q', 'pendingRequests', function($http, $q, pendingRequests) {
  this.get = function(url) {
    var canceller = $q.defer();
    pendingRequests.add({
      url: url,
      canceller: canceller
    });
    //Request gets cancelled if the timeout-promise is resolved
    var requestPromise = $http.get(url, { timeout: canceller.promise });
    //Once a request has failed or succeeded, remove it from the pending list
    requestPromise.finally(function() {
      pendingRequests.remove(url);
    });
    return requestPromise;
  }
}])
// The controller just helps generate requests and keep a visual track of pending ones
.controller('AppCtrl', ['$scope', 'httpService', 'pendingRequests', function($scope, httpService, pendingRequests) {
  $scope.requests = [];
  $scope.$watch(function() {
    return pendingRequests.get();
  }, function(pending) {
    $scope.requests = pending;
  })

  var counter = 1;
  $scope.addRequests = function() {
    for (var i = 0, l = 9; i < l; i++) {
      httpService.get('https://public.opencpu.org/ocpu/library/?foo=' + counter++);
    }
  };
  $scope.cancelAll = function() {
    pendingRequests.cancelAll();
  }
}]);

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