Ionic 4网络检查

Question

如何在Ionic 4的每个页面中检查互联网连接。需要的是，如果存在网络错误，我需要将应用程序重定向到错误页面。

Answer 1

你可以尝试官方的离子网络插件(文档here)。

文档中的使用示例：

import { Network } from '@ionic-native/network/ngx'; //ngx

constructor(private network: Network) { }

...

// watch network for a disconnect
let disconnectSubscription = this.network.onDisconnect().subscribe(() => {
  console.log('network was disconnected :-(');
});

// stop disconnect watch
disconnectSubscription.unsubscribe();


// watch network for a connection
let connectSubscription = this.network.onConnect().subscribe(() => {
  console.log('network connected!');
  // We just got a connection but we need to wait briefly
   // before we determine the connection type. Might need to wait.
  // prior to doing any api requests as well.
  setTimeout(() => {
    if (this.network.type === 'wifi') {
      console.log('we got a wifi connection, woohoo!');
    }
  }, 3000);
});

// stop connect watch
connectSubscription.unsubscribe();

Answer 2

使用以下命令安装网络信息插件：-

cordova plugin add cordova-plugin-network-information

然后，您可以在deviceready之后使用以下代码在设备离线时执行一些代码：

document.addEventListener("offline", onOffline, false);

function onOffline() {
    // Handle the offline event
    // use code to redirect here
}

Answer 3

if (this.network.type === 'none') {
        this.presentAlert('network was disconnected :-(');
        setTimeout(() => {
            navigator['app'].exitApp();
        }, 4000);
}