socket.io和node js:聊天不会显示在屏幕上

时间:2016-07-15 13:25:37

标签: node.js websocket socket.io livechat

我通过创建实时聊天来尝试socket.io,并在提交消息时页面自动刷新,这里是标记和客户端JS(index.html):

<body>
    <h1>Open chat</h1>

    <form id="send_message">
        <div class="chat">

        </div>
        <hr />
        <input size="28" type="text" id="message" />
        <input type="submit" value="send" />
    </form>

    <script src="http://code.jquery.com/jquery-latest-min.js"></script>
    <script src="/socket.io/socket.io.js"></script>
    <script>
        JQuery(function($){
            var socket = io.connect();
            var $message_form = $('#send_message');
            var $message_box = $('#message');
            var $chat = $('#chat');

            $message_form.submit(function(e){
                e.preventDefault();
                socket.emit('send message', $message_box.val());
                $message_box.val('');                   
            })
        });

        socket.on('new message', function(data){
            $chat.append(data+'<br />');
        });
    </script>
</body>

这是服务器端js(app.js):

var express = require('express'),
app = express(),
server = require('http').createServer(app),
io = require('socket.io').listen(server);

server.listen(3000);

app.get('/',function(req, res){
    res.sendfile(__dirname + '/index.html');
});

io.sockets.on('connection',function(socket){
    socket.on('send message', function(data){
        io.sockets.emit('new message',data);
    });
});

我知道你们不需要这个,但这是package.json:

{
"name":"test_chat_application",
"version":"0.0.1",
"private":"true",
"dependencies":{
    "socket.io":"1.4.8",
    "express":"4.14.0"
}

}

基本上我认为问题是页面刷新! 请帮忙..

3 个答案:

答案 0 :(得分:0)

我认为您应该添加return false以防止表单“真正”提交(从而刷新页面)。我认为提交事件不是冒泡的,所以e.preventDefault在这种情况下不起作用。

$message_form.submit(function(e){
  e.preventDefault();
  socket.emit('send message', $message_box.val());
  $message_box.val('');
  return false;         
})

答案 1 :(得分:0)

<div class="chat"></div> <!-- this is class -->

// But you are using

var $chat = $('#chat');

同时将chat容器移到form#send_message之外并使用document.ready

这应该很好用

<div class="chat"></div>
<hr />
<form id="send_message">
    <input size="28" type="text" id="message" />
    <input type="submit" value="send" />
</form>

<script>
$(document).ready(function() {
    var socket = io.connect();
    var $message_form = $('#send_message');
    var $message_box = $('#message');
    var $chat = $('#chat');

    $message_form.submit(function(e){
        e.preventDefault();
        socket.emit('send message', $message_box.val());
        $message_box.val('');                   
    });
    socket.on('new message', function(data){
        $chat.append(data+'<br />');
    });
});
</script>

更好的方式

当你使用socket(哪种ajax)时 - 你放弃了表单元素的所有好处,所以根本就不要使用它

<div class="chat"></div>
<hr />
<input size="28" type="text" id="message"/>
<button id="send_message">send</button>
<script>
    $(document).ready(function() {
        var socket = io.connect();
        var $message_form = $('#send_message');
        var $message_box = $('#message');
        var $chat = $('#chat');

        $message_form.click(function(){
           socket.emit('send message', $message_box.val());
           $message_box.val('');                   
        });
        socket.on('new message', function(data){
            $chat.append(data+'<br />');
        });
    });
</script>

答案 2 :(得分:0)

你必须抛弃表单,更新一些东西(比如var socket = io()而不是var socket = io.connect()和stuff)并使用onclick事件而不是表单提交来处理你的发送按钮。那样你就不会刷新了。

无论如何,更新的server.js:

var express = require('express'),
app = express(),
server = require('http').createServer(app),
io = require('socket.io').listen(server);

server.listen(3000);

app.use(express.static('./'));

app.get('/',function(req, res){
  res.sendFile(__dirname + '/index.html');
});

io.on('connection',function(socket){
  console.log('SOMEONE CONNECTED:', socket.id);

  socket.on('send', function(data){
    console.log(data);
    io.sockets.emit('new', data);
  });
});

的index.html

<body>
<h1>Open chat</h1>
<div class="chat">
        <ul id="messages">

        </ul>
</div>
<hr />
<input size="28" type="text" id="message" />
<input type="button" onclick="send()" value="send" />

<script src="https://cdn.socket.io/socket.io-1.4.5.js"></script>
<script>
        var socket = io();

        function send(){
            var message = document.getElementById("message").value;
            socket.emit("send", { "message" : message });
            document.getElementById("message").value = "";
        }

  socket.on("new", function(data){
            console.log("NEW MESSAGE : ", data);
            var chatMessage = document.createElement("li");
            chatMessage.innerHTML = data.message;
    document.getElementById("messages").appendChild(chatMessage)
  });
</script>

试试这个,让我知道它是否有效