我正在学习nodejs,我有一个项目,我希望用户发布表单数据,然后填充位于 public / index.html 中的html表。
目前,我正在使用以下代码将提交的数据写入数据库集合:
const mongoose = require('mongoose')
const express = require('express');
const app = express();
const server = app.listen(3000);
app.use(express.json()); // for retrieving form data
app.use(express.static('public'));
mongoose.connect('mongodb://localhost/class', {useNewUrlParser: true})
.then( () => console.log('Connected to class database'))
.catch( () => console.error('Connection attempt to class database failed'))
const personSchema = new mongoose.Schema({
name: String,
date: {type: Date, default: Date.now}
})
const Person = mongoose.model('Person', personSchema)
app.post('/join_class', (req,res) => {
res.send('... joining class')
console.debug(req.body.name)
// document.getElementById('class_table').insertRow(req.body.name)
joinClass(req.body)
})
async function joinClass(data){
console.log(data)
person = new Person({
name: data.name
})
await person.save();
}
我的问题是我需要相同的数据来填充位于我的 public / index.html 中的HTML表,但是我当然无法访问index.js中的文档对象。 index.html文件如下:
<!DOCTYPE html>
<html lang="en">
<head>
<script src='https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.dev.js'></script>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<!-- <script src="/client.js"></script> -->
<title>TestING</title>
</head>
<body>
<table id='class_table'>
<tr><th>Class</th></tr>
<tr><td>testing</td></tr>
</table>
</body>
</html>
那么,如何创建一个mongoDB事件/警报,以便在将发布数据插入数据库时,相同的数据可用于index.html,在这里我可以使用文档对象填充表? >
答案 0 :(得分:0)
在此示例中,您可以添加新的“人员”,并且index.html页面中的列表应在成功插入后更新。
index.js
app.post('/join_class', (req, res) => {
var person = new Person({
name: req.body.name
});
person.save().then((data) => {
res.send(data);
}).catch((err) => {
res.status(500).send(err);
});
})
app.get('/class', (req, res) => {
Person.find({}).then((data) => {
res.send(data);
}).catch((err) => {
res.status(500).send(err);
});
})
index.html(正文标签内容)
<body>
<div>
Name:<br>
<input type="text" id="name" value="">
<br>
<button onclick="addPerson()">Add Person</button>
</div>
<br/>
<b>Person's in List: </b>
<ul id='class_table'>
</ul>
<script src="/client.js"></script>
</body>
client.js
function listPerson() {
var req = new XMLHttpRequest();
req.open("GET", '/class');
req.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
req.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
var aList = JSON.parse(req.responseText),
list = document.getElementById("class_table");
list.innerHTML = "";
aList.forEach(e => {
var item = document.createElement("li");
item.innerHTML = e.name;
list.appendChild(item);
});
}
};
req.send();
}
function addPerson() {
var req = new XMLHttpRequest();
req.open("POST", '/join_class');
req.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
req.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) { listPerson(); } //Get list of Person on completion
};
var sName = document.getElementById("name").value;
req.send(JSON.stringify({ "name": sName }));
}
//Initially load a list of Person's
listPerson();