我试图从ajax发布数据(上传音乐文件),然后当我点击“上传”时,应该将数据保存到我的mongodb中。按钮。但是,我一直在获取fieldname是未定义的。我认为在我的代码中某处,它没有获取数据。
$('#upload').on('click', function(){
var formData = new FormData($('#file')[0].files[0]);
$.ajax({
url: 'http://localhost:3000/api/',
method: 'POST',
// data: {
// file: $('#file')[0].files[0]
// },
data: formData,
contentType: false,
processData: false,
mimeType: "multipart/form-data",
success: function(data){ //if successful upon grabbing data
console.log(data);
console.log('Created music')
var id = $('<p>').text("Id:" + data[i]._id);
var title = $('<p>').text("Title:" + data[i].originalname);
var play = $('<button>').data('Data-id', data[i]._id).text('Play').on('click', playSong); //creates edit button with donut id and carries a function editDonut in which we will define later
var del = $('<button>').data('Data-id', data[i]._id).text('Delete').on('click', deleteMusic);
var container = $('<div>').attr('Data-id', data[i]._id);
$(container).append(id, title, play, del);
$('body').append(container)
// $('#new-form').hide();
}
})
})
的index.html
<form id="new-form">
<input id="file" type="file" name="uploads">
<button id="upload">Upload</button>
</form>
Express中的后端 - apiRouter.js
var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, './public/uploads/'); //UPLOAD MUSIC PATH
},
filename: function (req, file, cb) {
var originalname = file.originalname;
var extension = originalname.split(".");
filename = Date.now() + '.' + extension[extension.length-1];
cb(null, filename);
}
});
router.post('/', multer({storage: storage}).single('uploads'), function(req,res){
console.log(req.body);
var music = new Music ({
fieldname: req.file.fieldname,
originalname: req.file.originalname,
encoding: req.file.encoding,
mimetype: req.file.mimetype,
destination: req.file.destination,
filename: req.file.filename,
path: './uploads/' + req.file.filename,//req.file.path, //PATH TO PLAY MUSIC
size: req.file.size
})
music.save(function(err){
if (err){console.log(err)}
else {
res.redirect('/');
}
})
});
在Express - app.js
中app.use('/api', apiRouter);
终端错误
TypeError: Cannot read property 'fieldname' of undefined
at /Users/will/pulse-express2-passport/config/apiRouter.js:72:24
at Layer.handle [as handle_request] (/Users/will/pulse-express2-passport/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/will/pulse-express2-passport/node_modules/express/lib/router/route.js:131:13)
at Array.<anonymous> (/Users/will/pulse-express2-passport/node_modules/multer/lib/make-middleware.js:52:37)
at listener (/Users/will/pulse-express2-passport/node_modules/on-finished/index.js:169:15)
at onFinish (/Users/will/pulse-express2-passport/node_modules/on-finished/index.js:100:5)
at callback (/Users/will/pulse-express2-passport/node_modules/ee-first/index.js:55:10)
at IncomingMessage.onevent (/Users/will/pulse-express2-passport/node_modules/ee-first/index.js:93:5)
at emitNone (events.js:86:13)
at IncomingMessage.emit (events.js:185:7)
at endReadableNT (_stream_readable.js:934:12)
at _combinedTickCallback (internal/process/next_tick.js:74:11)
at process._tickCallback (internal/process/next_tick.js:98:9)
答案 0 :(得分:3)
FormData
构造函数需要一个表单,从中提取键(元素名称)和值。将表单而不是文件传递给构造函数。
var formData = new FormData($('#new-form')[0]);
或者您可以创建一个空的FormData对象,然后将值添加到它。
var formData = new FormData();
formData.append('uploads', $('#file')[0].files[0]);