Javascript 使用parse和back4app以及nodejs和express上载和检索图像
也许这是一个已经回答过的问题,但我似乎找不到适合我的正确答案。我看不出我的代码有什么问题 我有一个表格可以上传车辆的详细信息,如路线、价格、车辆图片等。当我获得图像的url时,它不会显示任何内容 这是我用来发布表单的代码Javascript 使用parse和back4app以及nodejs和express上载和检索图像,javascript,node.js,express,parse-platform,back4app,Javascript,Node.js,Express,Parse Platform,Back4app,也许这是一个已经回答过的问题,但我似乎找不到适合我的正确答案。我看不出我的代码有什么问题 我有一个表格可以上传车辆的详细信息,如路线、价格、车辆图片等。当我获得图像的url时,它不会显示任何内容 这是我用来发布表单的代码 //POST create vehicle app.post('/createVehicle', async function(req, res, next){ const fileData = new Parse.File("VehiclePic",
//POST create vehicle
app.post('/createVehicle', async function(req, res, next){
const fileData = new Parse.File("VehiclePic", { base64: req.body.VehicleImg }, "image/png");
console.log(fileData);
let car = new Car();
const Vehicle = {
VehicleImg: fileData,
Name: req.body.Name,
description: req.body.description,
Price: parseInt(req.body.Price),
Route: req.body.Route,
PassengerAmount: parseInt(req.body.PassengerAmount)
}
try{
fileData.save().then(saved => {
car.set('Image', saved);
car.set('Name', Vehicle.Name);
car.set('Description', Vehicle.description);
car.set('Route', Vehicle.Route);
car.set('Price', Vehicle.Price);
car.set('PassengerAmount', Vehicle.PassengerAmount);
console.log("URL vehiculo " + saved.url());
car.save();
console.log("El vehiculo ha sido creado con exito!");
})
}catch(error){
console.error('error ' , error);
}
res.redirect('/');
});
我不使用Vehicle.VehicleImg的原因是它返回一个未定义的对象
下面是获取所有数据的代码
const Car = Parse.Object.extend('Vehicle');
const query = new Parse.Query(Car);
app.get('/', async function(req, res) {
const VehicleInfo = [];
query.notEqualTo("objectId", null);
try {
const result = await query.find();
result.forEach(vehicle => {
const vehiclePic = vehicle.get('Image');
VehicleInfo.push({
VehicleID: vehicle.id,
VehicleImage: vehiclePic,
VehicleName: vehicle.get('Name'),
Description: vehicle.get('Description'),
Price: vehicle.get('Price'),
Rating: vehicle.get('Rating'),
Route: vehicle.get('Route'),
PassengerAmount: vehicle.get('PassengerAmount')
});
});
res.render('index', {
title: 'MainPage',
VehicleData: VehicleInfo
});
} catch (error) {
console.error('error fetching objects', error);
}
});
编辑:这是表单,我正在使用ejs
<div class="createVehicle-section container">
<br>
<form method="POST" action="/createVehicle" enctype="multipart/form-data">
<div id="img">
<label for="VehicleImg">Seleccione la imagen:</label>
<input type="file" id="VehicleImg" name="VehicleImg" >
</div>
<br>
<div class="col-lg-12 row">
<div class="col-md-6">
<label for="VehicleName">Nombre del vehiculo</label>
<input type="text" id="VehicleName" name="Name">
<br>
<label for="DescriptionVe">Descripción</label>
<input type="text" id="Descriptionve" name="description">
</div>
<div class="col-md-6">
<label for="PriceVe">Precio</label>
<input type="number" id="PriceVe" name="Price" min="0" max="9999">
<br>
<label for="RouteVe">Ruta</label>
<input type="text" id="RouteVe" name="Route">
</div>
</div>
<br>
<div class="col-md-6 container">
<label for="PassegerAmountVe">Cantidad de Pasajeros Permitida</label>
<input type="number" id="PassengerAmountVe" name="PassengerAmount" min="0" max="9999">
</div>
<br>
<div class="text-center">
<input class="btn btn-main btn-lg btn-shadow" type="submit" value="Guardar"/>
</div>
</form>
<br>
</div>
请尝试以下代码:
const upload=multer();
app.post('/createVehicle',upload.single('VehicleImg'),异步函数(req、res、next){
const fileData=new Parse.File(“VehiclePic.png”,[…req.File.buffer],“image/png”);
console.log(文件数据);
出租汽车=新车();
常数车辆={
VehicleImg:fileData,
名称:req.body.Name,
描述:req.body.description,
价格:parseInt(需求主体价格),
路线:req.body.Route,
PassengerAmount:parseInt(请求主体PassengerAmount)
}
试一试{
fileData.save().then(saved=>{
car.set('图像',已保存);
车辆组(“名称”,车辆名称);
车辆组(“说明”,车辆说明);
车辆设置(“路线”,车辆路线);
car.set(“价格”,车辆价格);
car.set('PassengerAmount',Vehicle.PassengerAmount);
console.log(“URL vehiculo”+saved.URL());
car.save();
控制台日志(“El vehiculo ha sido creado con exito!”);
})
}捕获(错误){
console.error('error',error);
}
res.redirect('/');
});
您能在req.body.VehicleImg
查看您拥有的数据类型吗?是真的吗?另外,在保存文件时,尝试将扩展名添加到文件名中。它表示它是一个字符串。我不知道它是否有用,但在我的表单中,我没有添加enctype=“multipart/form data”,如果我添加它说它无法解析该数据,因为它看起来未定义。你能分享你表单的代码吗?完成了,希望这能在某种程度上有所帮助。你有处理多部分表单数据的中间件吗?您将需要类似或(节点:59536)的未处理PromisejectionWarning:TypeError:无法使用该数据创建Parse.File。我做了console.log(req.file.buffer),这就是它显示的内容,我刚刚更新了答案。尝试constfiledata=new Parse.File(“VehiclePic.png”、[…req.File.buffer]、“image/png”)代码>谢谢,先生,现在它工作得很好,[…]是什么意思或作用?它基本上将缓冲区转换为字节数组(这是Parse JS SDK希望接收的格式)。
//Multer Image Storage
const storage = multer.diskStorage({
destination: './public/images/',
filename: function(req, file, cb){ //cb = callback
cb(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname));
}
});
// Init Upload
const upload = multer({
storage: storage,
limits:{fieldSize: 1000000},
fileFilter: function(req, file, cb){
checkFileType(file, cb);
}
}).single('VehicleImg');