NodeJS:无法获取 post 请求文本字段
NodeJS: cannot grab post request text field
我是 Node JS 的新手,所以事情对我来说并不容易。场景是我有输入字段,它将接受多个文件。
<input id="upload-input" type="file" name="uploads[]" multiple="multiple">
在我的 JS 脚本中,我获取了该字段的更改事件,并使用 formData
和 [在不同的端口 运行 对我的上传器应用程序创建了一个 post 请求和 ajax
post 方法
$('#upload-input').on('change', function() {
var files = $(this).get(0).files;
if (files.length > 0) {
var formData = new FormData();
formData.append('directory', "path/to/directory");
for (var i = 0; i < files.length; i++) {
var file = files[i];
formData.append('uploads[]', file, file.name);
}
$.ajax({
url: 'https://myurl.com:3000/upload',
type: 'POST',
data: formData,
processData: false,
contentType: false,
success: function(data) {
console.log(data);
},
});
}
});
现在文件正在发送,在我的后端我可以使用 formidable
上传它,但问题是我无法获得 directory
值,这是我的代码
require('dotenv').load();
var express = require('express');
var app = express();
var path = require('path');
var formidable = require('formidable');
var fs = require('fs');
var session = require('express-session');
app.set('views', __dirname + '/public');
app.use('/uploads', express.static(process.env.USER_UPLOADS))
var cors=require('cors');
app.use(cors({origin:true,credentials: true}));
app.post('/upload', function(req, res) {
var user_folder = "path/to/directory/";
var form = new formidable.IncomingForm();
form.multiples = true;
form.uploadDir = path.join(__dirname, process.env.USER_UPLOADS + user_folder);
form.on('file', function(field, file) { fs.rename(file.path, path.join(form.uploadDir, file.name)); });
form.on('error', function(err) { console.log('An error has occured: \n' + err); });
form.on('end', function() { res.end('success'); });
form.parse(req);
});
var server = app.listen(3000, function(){
console.log('Server listening on port 3000');
});
我试过了
console.log(req.body)
但它 returns undefined
,那么如何从后端获取 directory
值?
提前致谢。
为了解决您的问题,我对您的主应用程序的服务器文件进行了一些更改
即 server.js/app.js/index.js
任何适用于您的人。请参阅以下更改:
require('dotenv').load();
var express = require('express');
var app = express();
var path = require('path');
var bodyParser = require('body-parser');
var formidable = require('formidable');
var fs = require('fs');
var session = require('express-session');
var cors=require('cors');
app.set('views', __dirname + '/public');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cors({ origin:true, credentials: true }));
app.use('/uploads', express.static(process.env.USER_UPLOADS));
app.post('/upload', function(req, res) {
var user_folder = "path/to/directory/";
var form = new formidable.IncomingForm();
form.multiples = true;
form.uploadDir = path.join(__dirname, process.env.USER_UPLOADS + user_folder);
form.on('file', function(field, file) { fs.rename(file.path, path.join(form.uploadDir, file.name)); });
form.on('error', function(err) { console.log('An error has occured: \n' + err); });
form.on('end', function() { res.end('success'); });
// Note the changes here
form.parse(req, (error, fields, files) => {
console.log(JSON.stringify({
fields, // { directory: "path/to/directory" }
files // contains the uploaded files
}), null, 2);
});
});
var server = app.listen(3000, function(){
console.log('Server listening on port 3000');
});
根据 here 的文档,form.parse
可以采用可选的回调函数。
Parses an incoming node.js request containing form data. If cb is provided, all fields and files are collected and passed to the callback:
form.parse(req, function(err, fields, files) {
// ...
});
我是 Node JS 的新手,所以事情对我来说并不容易。场景是我有输入字段,它将接受多个文件。
<input id="upload-input" type="file" name="uploads[]" multiple="multiple">
在我的 JS 脚本中,我获取了该字段的更改事件,并使用 formData
和 [在不同的端口 运行 对我的上传器应用程序创建了一个 post 请求和 ajax
post 方法
$('#upload-input').on('change', function() {
var files = $(this).get(0).files;
if (files.length > 0) {
var formData = new FormData();
formData.append('directory', "path/to/directory");
for (var i = 0; i < files.length; i++) {
var file = files[i];
formData.append('uploads[]', file, file.name);
}
$.ajax({
url: 'https://myurl.com:3000/upload',
type: 'POST',
data: formData,
processData: false,
contentType: false,
success: function(data) {
console.log(data);
},
});
}
});
现在文件正在发送,在我的后端我可以使用 formidable
上传它,但问题是我无法获得 directory
值,这是我的代码
require('dotenv').load();
var express = require('express');
var app = express();
var path = require('path');
var formidable = require('formidable');
var fs = require('fs');
var session = require('express-session');
app.set('views', __dirname + '/public');
app.use('/uploads', express.static(process.env.USER_UPLOADS))
var cors=require('cors');
app.use(cors({origin:true,credentials: true}));
app.post('/upload', function(req, res) {
var user_folder = "path/to/directory/";
var form = new formidable.IncomingForm();
form.multiples = true;
form.uploadDir = path.join(__dirname, process.env.USER_UPLOADS + user_folder);
form.on('file', function(field, file) { fs.rename(file.path, path.join(form.uploadDir, file.name)); });
form.on('error', function(err) { console.log('An error has occured: \n' + err); });
form.on('end', function() { res.end('success'); });
form.parse(req);
});
var server = app.listen(3000, function(){
console.log('Server listening on port 3000');
});
我试过了
console.log(req.body)
但它 returns undefined
,那么如何从后端获取 directory
值?
提前致谢。
为了解决您的问题,我对您的主应用程序的服务器文件进行了一些更改
即 server.js/app.js/index.js
任何适用于您的人。请参阅以下更改:
require('dotenv').load();
var express = require('express');
var app = express();
var path = require('path');
var bodyParser = require('body-parser');
var formidable = require('formidable');
var fs = require('fs');
var session = require('express-session');
var cors=require('cors');
app.set('views', __dirname + '/public');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cors({ origin:true, credentials: true }));
app.use('/uploads', express.static(process.env.USER_UPLOADS));
app.post('/upload', function(req, res) {
var user_folder = "path/to/directory/";
var form = new formidable.IncomingForm();
form.multiples = true;
form.uploadDir = path.join(__dirname, process.env.USER_UPLOADS + user_folder);
form.on('file', function(field, file) { fs.rename(file.path, path.join(form.uploadDir, file.name)); });
form.on('error', function(err) { console.log('An error has occured: \n' + err); });
form.on('end', function() { res.end('success'); });
// Note the changes here
form.parse(req, (error, fields, files) => {
console.log(JSON.stringify({
fields, // { directory: "path/to/directory" }
files // contains the uploaded files
}), null, 2);
});
});
var server = app.listen(3000, function(){
console.log('Server listening on port 3000');
});
根据 here 的文档,form.parse
可以采用可选的回调函数。
Parses an incoming node.js request containing form data. If cb is provided, all fields and files are collected and passed to the callback:
form.parse(req, function(err, fields, files) {
// ...
});