如何判断 Stomp 服务器何时与 Stomp.JS 客户端断开连接

问题描述

我正在通过 Sock.JS 客户端发送 stomp 消息.当我断开服务器连接时，我希望在客户端上显示一条警告消息.为此，我实现了服务器端心跳

I am sending a stomp message over a Sock.JS client. When I disconnect the server I would like a warning message to show up on the client. To do this I have implemented a server side heartbeat

stompClient = Stomp.over(socket);
stompClient.heartbeat.outgoing = 20000;
stompClient.heartbeat.incoming = 20000;
stompClient.connect({}, function(frame) {
  ...
}

在 Chrome 开发者控制台中，我看到消息

In the Chrome developer console I see the message

POST http://localhost:8080/hello/800/8n_btbxb/xhr_streaming net::ERR_CONNECTION_RESET sockjs-0.3.min.js:27
Whoops! Lost connection to undefined

如何捕获此错误消息?

推荐答案

正如来自 muttonUp stomp.js 所指出的https://github.com/jmesnil/stomp-websocket/ 将覆盖 onclose 处理程序.另一方面，它提供了在连接时传递错误回调的选项:

As pointed out by muttonUp stomp.js from https://github.com/jmesnil/stomp-websocket/ will overwrite the onclose handler. On the other hand it provides the option to pass an error-callback on connect:

stompClient.connect({}, function(frame) {
    ...
}, function(message) {
    // check message for disconnect
});

由于您的回调会收到多种错误，因此您必须检查消息，它确实是哎呀！[...]"，表示连接丢失.

Since you will get several kinds of errors delivered to your callback, you have to check the message it it was indeed the "Whoops! [...]" which indicates a connection loss.

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