错误：
TypeError: Cannot destructure property 'firstName' of 'req.body.warranty' as it is undefined.
我试图通过本文档https://www.npmjs.com/package/multer处理MulterError，但是 遇到了问题。
Console.log（req.body）给出{}，而表单enctype等于'multipart / form-data'。如果我将其更改为'application / x-www-form-urlencoded'req.body是正常的，但是文件没有上载到服务器。
滥用者
var storage = multer.diskStorage({
destination:"./public/uploads/",
filename:(req,file,cb)=>{
cb(null,file.fieldname+"-"+Date.now()+path.extname(file.originalname));
}
});
var upload = multer({
storage: storage,
limits:{fileSize: 10000000}
}).fields([{
name: 'purchasePhoto', maxCount: 1
}, {
name: 'defectPhoto', maxCount: 1
}]);
从保修页面过帐带有enctype =“ multipart / form-data”表格的路线
router.post("/warranty", function(req, res){
upload(req, res, function (err) {
if (err instanceof multer.MulterError) {
req.flash('error', 'Multer Error');
return res.redirect('/pages/warranty#flash');
} else if (err) {
console.log('error');
}
});
var { firstName, lastName, streetAdress, city, state, zip, country, email, phoneNumber, product, bikeShop, assembledBy, issue} = req.body.warranty;
var newWarranry = { purchasePhoto: purchasePhoto, defectPhoto: defectPhoto, firstName: firstName, lastName: lastName, streetAdress: streetAdress, city: city, state: state, zip: zip, country: country, email: email, phoneNumber: phoneNumber, product: product, bikeShop: bikeShop, assembledBy: assembledBy, issue: issue};
if ( !firstName || !lastName || !streetAdress || !city || !state || !zip || !country || !email || !phoneNumber || !product || !bikeShop || !assembledBy ) {
req.flash('error', 'Please enter all of the fields with "*"');
return res.redirect('/pages/warranty#flash');
} else{
Warranty.create(newWarranry, function(err, newWarranry){
if(err){
console.log(err);
}else{
console.log(newWarranry);
req.flash('success', 'Thank you! The form was submitted successfully.');
return res.redirect('/pages/warranty#flash');
}
});
}
});
带有action =“ warranty” method =“ post”和enctype =“ multipart / form-data”的保修页面表单。名称为“ warranty [...]”的所有输入
<form action="warranty" method="post" enctype="multipart/form-data">
<b>Warranty Claim Form</b>
<h6>Rider Info</h6>
<div class="row">
<div>
<input type="" name="warranty[firstName]" placeholder="First Name*">
</div>
<div>
<input type="" name="warranty[lastName]" placeholder="Last Name*">
</div>
<div>
<input type="" name="warranty[streetAdress]" placeholder="Street Adress*">
</div>
<div>
<input type="" name="warranty[streetAdressLine]" placeholder="Street Adress Line 2">
</div>
<div>
<input name="warranty[city]" placeholder="City*">
</div>
<div>
<input type="" name="warranty[state]" placeholder="State/Province*">
</div>
<div>
<input type="" name="warranty[zip]" placeholder="ZIP/Postal code*">
</div>
<div>
<input type="" name="warranty[country]" placeholder="Country*">
</div>
<div>
<input type="" name="warranty[email]" placeholder="Email*">
</div>
<div>
<input type="" name="warranty[phoneNumber]" placeholder="Phone Number*">
</div>
</div>
<h6>Product Details</h6>
<div class="row">
<div>
<input name="warranty[product]" placeholder="Product (Ex. Titan II Frame)*">
</div>
<div>
<input type="" name="warranty[color]" placeholder="Color (Ex. Black)">
</div>
<div>
<input type="" name="warranty[size]" placeholder="Size (Ex. 20.5in / 175mm)">
</div>
<div>
<input type="" name="warranty[serialNumber]" placeholder="Serial number or date code (bikes, frames, forks, bars, cranks only)">
</div>
</div>
<h6>PURCHASE & ASSEMBLY DETAILS</h6>
<div class="row">
<div >
<input name="warranty[bikeShop]" placeholder="Bike Shop or online retailer*">
</div>
<div>
<input type="" name="warranty[modelYear]" placeholder="Model year (Ex.2015)">
</div>
<div >
<input type="" name="warranty[assembledBy]" placeholder="Assembled by myself/ bike shop">
</div>
</div>
<h6>PRODUCT ISSUE/DEFECT INFORMATION</h6>
<div class="row">
<div>
<textarea name="warranty[issue]"></textarea>
</div>
</div>
<h6>UPLOAD PROOF OF PURCHASE OR RECEIPT (SCAN OR MOBILE PHOTO)</h6>
<div>
<input type="file" name="purchasePhoto" id="fileOne">
<label for="fileOne">
<span>Upload file</span>
</label>
</div>
<h6>UPLOAD PRODUCT IMAGES, INCLUDING IMAGES OF DEFECTS</h6>
<div class="form-group">
<input type="file" name="defectPhoto" id="fileTwo">
<label for="fileTwo">
<span>Upload file</span>
</label>
</div>
<div>
<button type="submit"><p>Submit</p></button>
</div>
</form>
答案 0 :(得分：0)
将您的代码移至multer调用器中
router.post("/warranty", function(req, res) {
upload(req, res, function(err) {
if (err) {
req.flash("error", "Multer Error");
return res.redirect("/pages/warranty#flash");
}
var {
firstName,
lastName,
streetAdress,
city,
state,
zip,
country,
email,
phoneNumber,
product,
bikeShop,
assembledBy,
issue
} = req.body.warranty;
var newWarranry = {
purchasePhoto: purchasePhoto,
defectPhoto: defectPhoto,
firstName: firstName,
lastName: lastName,
streetAdress: streetAdress,
city: city,
state: state,
zip: zip,
country: country,
email: email,
phoneNumber: phoneNumber,
product: product,
bikeShop: bikeShop,
assembledBy: assembledBy,
issue: issue
};
if (
!firstName ||
!lastName ||
!streetAdress ||
!city ||
!state ||
!zip ||
!country ||
!email ||
!phoneNumber ||
!product ||
!bikeShop ||
!assembledBy
) {
req.flash("error", 'Please enter all of the fields with "*"');
return res.redirect("/pages/warranty#flash");
} else {
Warranty.create(newWarranry, function(err, newWarranry) {
if (err) {
console.log(err);
} else {
console.log(newWarranry);
req.flash(
"success",
"Thank you! The form was submitted successfully."
);
return res.redirect("/pages/warranty#flash");
}
});
}
});
});
答案 1 :(得分：0)
问题不在于我们发送数据的方式，而是multer库无法从表单中解析出多个文件。
使用multer.array方法，它应该可以正常工作，我尝试了您给出的似乎可以正常工作的示例。
在app.js内，使用app.use(upload.array())，其中上载是multer的实例。
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
let bodyParser = require('body-parser');
//******* require multer library ******
var multer = require('multer');
var upload = multer();
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
// ***** this line important
app.use(upload.array());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
这将解决问题！
答案 2 :(得分：0)
我的问题是我曾经使用过
app.use(bodyParser.urlencoded({extended: true}));
但是我不得不使用
app.use(bodyParser.urlencoded({extended: false}));