如何在 AngularJs 中检查互联网连接 [英] How to check internet connection in AngularJs

问题描述

这是我在 vanilla javascript 中检查互联网连接的方式:

This is how I would check internet connection in vanilla javascript:

setInterval(function(){
    if(navigator.onLine){
        $("body").html("Connected.");
    }else{
        $("body").html("Not connected.");
    }
},1000);

我的项目中有角度控制器和模块.我应该把上面的代码放在哪里?它应该在全局上下文中执行，而不是分配给某个控制器.可能有某种全局控制器吗?

I have angular controllers and modules in my project. Where should I put the code above? It should be executed in global context and not be assigned to a certain controller. Are there some kind of global controllers maybe?

推荐答案

首先，我建议你听听 线上/线下活动.

First of all, I advise you to listen to online/offline events.

你可以在 AnguarJS 中这样做:

You can do it this way in AnguarJS:

var app = module('yourApp', []);

app.run(function($window, $rootScope) {
      $rootScope.online = navigator.onLine;
      $window.addEventListener("offline", function() {
        $rootScope.$apply(function() {
          $rootScope.online = false;
        });
      }, false);

      $window.addEventListener("online", function() {
        $rootScope.$apply(function() {
          $rootScope.online = true;
        });
      }, false);
});

注意:我在 $apply 方法中包装了对根作用域变量的更改，以通知 Angular 某些内容已更改.

NOTE: I am wrapping changing of root scope's variable in $apply method to notify Angular that something was changed.

之后你可以:

在控制器中:

$scope.$watch('online', function(newStatus) { ... });

在 HTML 标记中:

In HTML markup:

 <div ng-show="online">You're online</div>
 <div ng-hide="online">You're offline</div>

这是一个工作 Plunker:http://plnkr.co/edit/Q3LkiI7Cj4RWBNRLEJUA?p=preview

Here is a working Plunker: http://plnkr.co/edit/Q3LkiI7Cj4RWBNRLEJUA?p=preview

其他解决方案可能是广播在线/离线事件.但在这种情况下，您需要在加载时初始化当前状态，然后订阅事件.

Other solution could be to broadcast online/offline event. But in this case you need to initialize current status upon loading and then subscribe to event.

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