javascript - NodeJS - socket.on 似乎没有被调用

Question

我正在使用 Node.JS POST 方法将表单提交到我的服务器。它被很好地传输到服务器；此阶段不会出现任何问题。但是，当我使用 io.emit 和 socket.io 将数据传输回客户端时，客户端似乎没有发生任何事情。控制台上没有打印任何内容，并且在命令提示符(我运行服务器的位置)中也没有收到任何错误。

index.html:

<form id="schoolCreateForm" action="http://localhost:3000/createSchool" method="POST">
    School name: <input name="schoolName" type="text"><br><br>
    Private?: <input name="schoolPrivate" type="checkbox"><br><br>
    Entry password: <input name="entryPassword" type="password"><br><br>
    <button type="submit">Submit</button>
</form>

<script>
    var socket = io();
    socket.on('updateSchool', function(response) {
        console.log(response);
        document.getElementById("headerSchoolName").innerHTML = data.schoolName;
    });
</script>

app.js:

var express = require('express');
var app = express();
var serv = require('http').Server(app);
var io = require('socket.io')(serv);

var bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({extended:false}));
app.use(bodyParser.json());

app.post('/createSchool', function(req, res) {
    response = {
        school_name: req.body.schoolName,
        school_private: req.body.schoolPrivate,
        entry_password: req.body.entryPassword
    };
    console.log(response);

    res.sendFile(__dirname + '/client/index.html');

    io.emit('updateSchool', response);
});

serv.listen(3000);
console.log("Server started on localhost://3000");

有谁知道这是怎么回事吗？

Answer 1

<form  action="http://localhost:3000/createSchool" method="POST">
School name: <input name="schoolName" type="text"><br><br>
Private?: <input name="schoolPrivate" type="checkbox"><br><br>
Entry password: <input name="entryPassword" type="password"><br><br>
<button type="submit" id="schoolCreateForm">Submit</button>

提交表单数据后，它将重新加载您的页面，这意味着套接字连接将被终止。如果您想查看套接字的响应，请发出 ajax.post 请求而不重新加载页面。

<form id="schoolCreateForm">
School name: <input name="schoolName" type="text"><br><br>
Private?: <input name="schoolPrivate" type="checkbox"><br><br>
Entry password: <input name="entryPassword" type="password"><br><br>
<button type="submit">Submit</button>
</form>

<script>
   document.querySelector('#schoolCreateForm').addEventListener('click', 
   function(e) {
     e.proventDefault() // this line will not all to reload page after 
                       /// submitting the 
                       //form data
 ### writh you ajax request functionality here 

  })
var socket = io();
socket.on('updateSchool', function(response) {
    console.log(response);
    document.getElementById("headerSchoolName").innerHTML = data.schoolName;
});