[英]Updating JSON file using JQuery to perform AJAX call nodejs
I want to add a new user to a json file by using the user input in a form I am able to upload the information to a txt file using the code below but I do not know how to do this using json, any help thank you 我想通过以下形式使用用户输入将新用户添加到json文件中:我可以使用以下代码将信息上传到txt文件中,但我不知道如何使用json来完成此操作,谢谢您的帮助
ejs file: ejs文件:
<!DOCTYPE html>
<html>
<head>
<title> users </title>
</head>
<body>
<h1>Users</h1>
<% include templates/header.ejs %>
<form action="http://127.0.0.1:3000/users" id="new" method="post" enctype='application/json'>
<div id="form">
<label for="lname">Last Name</label> <input type="text" id="lname" name="lname">
<label for="fname">First Name</label><input type="text"id="fname"name="fname">
<label for="id">ID</label><input type="text"id="id"name="id">
<button type="submit" id= "submit" value="Submit" >Submit</button>
</form>
</body>
</html>
user.js file: user.js文件:
var express = require('express');
var router = express.Router();
var fs = require("fs");
router.get('/', function(req, res, next) {
res.render('users');
});
//will send the user input
router.post('/', function(req, res) {
var first= req.body.fname;
var last= req.body.lname;
var id= req.body.id;
filePath = __dirname + '/people.txt';
fs.appendFile(filePath, JSON.stringify(first + " " + last + " "+ id ), function () {
res.end();
});
});
router.get('/listUsers', function (req, res) {
fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
console.log( data );
res.end( data );
});
})
module.exports = router;
I would recommend against using a file to do this. 我建议不要使用文件来执行此操作。 However if you insist you can always save the data in a standard JSON format.
但是,如果您坚持要始终将数据保存为标准JSON格式。 In order to do this you can do something like:
为此,您可以执行以下操作:
var express = require('express');
var router = express.Router();
var fs = require("fs");
router.get('/', function(req, res, next) {
res.render('users');
});
//will send the user input
router.post('/', function(req, res) {
var first= req.body.fname;
var last= req.body.lname;
var id= req.body.id;
var person = {
first: first,
last: last,
id: id
}; // if you are using es6 you do var person = {first, last, id}
var filePath = __dirname + '/people.json';
fs.readFile(filePath, function (err, file) {
if (err) {
res.status = 500;
res.send(err).end();
return;
}
var fileString = file.toString();
var people = fileString ? JSON.parse(fileString) : [];
people.push(person);
fs.writeFile(filePath, JSON.stringify(people), function(err) {
if (err) {
res.status = 500;
res.send(err).end();
return;
}
res.end();
});
});
});
router.get('/listUsers', function (req, res) {
fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
if (err) {
res.status = 500;
res.send(err).end();
return;
}
res.json(JSON.parse(data));
});
})
module.exports = router;
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