Unable to subscribe on topic using @stomp/stompjs

问题

Here is a part of my React component:

import React from 'react';
import { Client } from '@stomp/stompjs';

class Balance extends React.Component {

    componentDidMount() {
        const client = new Client({
            brokerURL: 'ws://localhost:8080/stomp',
            debug: (str) => {
                console.log(str);
            },
        });

        client.onConnect(() => {
            console.log('onConnect');
            client.subscribe('/topic/balance', message => {
                console.log(message);
            })
        });

        client.activate();
    }
...

It looks like connection was established according to the debug output to browser's console:

Opening Web Socket...
Web Socket Opened...
>>> CONNECT
accept-version:1.0,1.1,1.2
heart-beat:10000,10000
Received data
<<< CONNECTED
heart-beat:0,0
version:1.2
content-length:0
connected to server undefined

However, I don't see a message 'onConnect' in console, which means client.onConnect was never fired.

Therefore I can't subscribe to a topic.

What could be a problem here?

UPDATE:

回答1:

According to author it was a mix up in syntax of the library.

The corrected code from my question look as the following:

import React from 'react';
import { Client } from '@stomp/stompjs';

class Balance extends React.Component {
  componentDidMount() {
    // The compat mode syntax is totally different, converting to v5 syntax
    // Client is imported from '@stomp/stompjs'
    this.client = new Client();

    this.client.configure({
      brokerURL: 'ws://localhost:8080/stomp',
      onConnect: () => {
        console.log('onConnect');

        client.subscribe('/topic/balance', message => {
            console.log(message);
        })
      },
      // Helps during debugging, remove in production
      debug: (str) => {
        console.log(new Date(), str);
      }
    });

    this.client.activate();
  }
...

I created a full working example in my repo.

来源：https://stackoverflow.com/questions/52941127/unable-to-subscribe-on-topic-using-stomp-stompjs

标签

javascript

reactjs

websocket

stomp