在线和离线用户实时使用strophe.js [英] Online and Offline users using strophe.js in real time

问题描述

我正在使用 strophe.js javascript客户端库，使用以下代码连接 xmpp 服务器（ openfire ）。

I am using strophe.js javascript client library for connecting to xmpp server(openfire) using below code.

var BOSH_SERVICE = 'http://127.0.0.1:7070/http-bind/';
 connection = new Strophe.Connection(BOSH_SERVICE);

  connection.connect("jid",
                   "password",
                   onConnect);

和回调函数（onConnect）如下：

and callback function(onConnect) as below :

function onConnect(status)
{
    if (status == Strophe.Status.CONNECTING) {
    log('Strophe is connecting.');
    } else if (status == Strophe.Status.CONNFAIL) {
    log('Strophe failed to connect.');
    $('#connect').get(0).value = 'connect';
    } else if (status == Strophe.Status.DISCONNECTING) {
    log('Strophe is disconnecting.');
    } else if (status == Strophe.Status.DISCONNECTED) {
    log('Strophe is disconnected.');
    $('#connect').get(0).value = 'connect';
    } else if (status == Strophe.Status.CONNECTED) {
    log('Strophe is connected.');
    log('ECHOBOT: Send a message to ' + connection.jid + 
        ' to talk to me.');

    connection.addHandler(onMessage, null, 'message', null, null,  null); 
    connection.send($pres().tree());
    console.log($pres().tree());

    }
}

我成功连接到服务器使用此代码和在此之前没有问题。

i am successfully connect to server using this code and no problem until this.

问题：实时更新状态状态的用户列表。

Problem : updating user list with status in real time.

让我解释一下我的问题：

Let me explain my problem :

我想显示实时更新的在线和离线用户列表。（与显示聊天应用程序类似的东西。）

I want to show list of online and offline users with real time update.(something similar to showing chat apps.)

ex。假设有3个用户A，B和C.并且所有用户都在线（登录）

ex. Suppose there is 3 users A,B and C. and all are online (logged-in)

现在假设用户A断开连接或脱机然后用户B，C如何收到用户A？的状态通知。并且在用户B和C列表中没有刷新的情况下将用户A的状态更改为离线。

Now suppose user A get disconnect or go offline then how user B,C get notified with status of user A ?. and change status of user A to offline without refresh in user B and C list.

strophe.js中是否有任何方法会在某个连接时自动调用或断开连接。或者我应该自己编写吗？

is there is any method in strophe.js that will automatically call when some one get connect or dis-connect. or should i need to write my own?

我不确定但名单上有什么。

i am not sure but there is something with roster.

推荐答案

您可以使用此Strophe API为您的好友订阅状态：

You can subscribe to presence for your buddies using this Strophe API:

connection.send($pres({
  to: jid,     // buddy jid
  type: "subscribe"
}));

实现XMPP规范（参见 https://xmpp.org/rfcs/rfc3921.html#int 了解详情）。
好​​友可以接受订阅回复：

which implements the XMPP specification (see https://xmpp.org/rfcs/rfc3921.html#int for details). The buddy can accept subscription replying with:

connection.send($pres({
  to: from,  // jid of subscriber
  type: "subscribed"
}));

您可以在Plunker上查看基于XMPP（使用Strophe.js）的Web客户端示例：

You can check my web client example based on XMPP (using Strophe.js) on Plunker:

http://plnkr.co/edit/EhQHDsYpDhrECmaaIlZO

这篇关于在线和离线用户实时使用strophe.js的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！