套接字断开连接时如何更改特定用户的状态? [英] How to change status of perticular user when socket is disconnect?

问题描述

我在这里解决我在套接字连接和断开连接方面的问题.我想要这样的东西

II am here to resolve my problem in socket connection and disconnection. I want something like this

 1. connection done. (ok)  // working 
 2. on perticular event I am doing to update location of user in database { Here user is online }.
 3. But somehow network disconnection the socket will be disconnect and user must be offline. this can be using disconnect event. but I am not aware how to recognise that perticular user has to be updated offline because I don't have user_id in `socket.on('disconnect')` event. please help me out. I googled it everywhere but not helped me out.

抱歉想要逻辑，但我真的需要它.提前致谢.:)

sorry for wanting logic but it is really needed to me. Thanks in advance. :)

推荐答案

在断开连接时，就像您提到的，您可以根据 this.id 或 socket.id.

On disconnect, like you mentioned, you can track the id based on this.id or socket.id.

socket.on('disconnect', function() {
    console.log(this.id);
    console.log(socket.id);
});

或者，您可以使用全局数组处理套接字，如此答案中所建议.

Alternatively, you can handle sockets by using a global array, as suggested in this answer.

如果两者都合适，您可以对套接字对象进行一些依赖注入

If netiher of those are suitable, you can do some dependency injection on the socket object

io.on('connection', function(socket) {
    //Obtain the user_id somehow and add it into the socket object
    socket.user_id = "hello_world";

    socket.on('disconnect', function() {
        console.log(socket.user_id);
    });
});

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