Question

我正在尝试从根控制器更改常量的值。然后状态进入登录控制器，其中常量的值仍然是旧值。

最初CONSTANT的设置如下：

var myApp = angular.module("app");
myApp.constant("clientsList", [{"object1":....}]);

我有一个包含

的注销功能

$rootScope.$emit('updateClients', null);
$state.go('login', {}, {reload: true});

在根控制器中：

> $rootScope.$on('updateClients', function(event, clients) {
>         _this.clientsList = clients;
>         angular.module("app").constant("clientsList", clients);
>     });

在登录控制器中，在被state.go（'login'）重定向后：

.controller('LoginController', LoginController);
function LoginController(clientsList) {
   // clientsList still have the old value here:
}

如何更改clientsList常量的值？

Answer 1

我建议使用工厂（或服务，如果您愿意）来执行对API的调用并存储结果。这样，您就可以在所有控制器中访问这些值。

我创建了这个虚拟示例，我们使用相同的工厂来获取客户端和存储，然后我们将clientsList发送到两个不同的控制器：

angular.module('webapp', [])
      .controller('AppCtrl', function($scope, DummyFactory) {
          $scope.clientsList   = [];
          $scope.getClients = function () {
            DummyFactory.getClients().then(function(clientsList) {
              $scope.clientsList = clientsList;
            });
          };
     
      })
      .controller('OtherCtrl', function($scope, DummyFactory) {
          $scope.clientsList = DummyFactory.clientsList; 
      })
      .factory('DummyFactory', function ($q, $timeout) {
        var clientsList = [];
      
        var getClients = function () {
          // Here replace with your service call
          return $q(function (resolve) {
              $timeout(function () { 
                var result = [{name: 'a'}, {name:'b'}];
                
                // Here I use this so I don't create a new array
                // this way the reference is not lost in "Other Controller"
                // You could assign a new array, but then you 
                // would have to have a $watch on the "OtherController"
                Array.prototype.push.apply(clientsList, result);
                resolve(clientsList);
              }, 500);
          });
        };
        
        return { 
          clientsList: clientsList, 
          getClients: getClients 
        };
      });

<!DOCTYPE html>
    <html ng-app="webapp">
    <head>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.9/angular.min.js"></script>
    </head>
    <body ng-controller="AppCtrl">
        <div ng-controller="AppCtrl">
            <h1>App Controller:</h1>
            <button ng-click="getClients()">GET CLIENTS</button>
            <ul ng-repeat="item in clientsList">
               <li ng-bind="item.name"></li>
            </ul>
        </div>
      
        <div ng-controller="OtherCtrl">
          <h1>Other Controller:</h1>
          <ul ng-repeat="item in clientsList">
               <li ng-bind="item.name"></li>
            </ul>
        </div>
    </body>
    </html>

更改常量值并以角度1.4.9广播到子控制器

1 个答案: