验证 express js 中的表单字段时出现错误消息的问题

Posted 2023-03-07

【中文标题】验证 express js 中的表单字段时出现错误消息的问题

【英文标题】：issues with error messages while validating the form field in express js

【发布时间】：2017-10-05 07:26:26

【问题描述】：

如果出现任何验证错误，我想在同一个翡翠页面（即 register.jade）中显示适当的错误消息。如果没有，那么我想在模式对象的帮助下成功存储数据并返回我的主页.但是目前，即使输入正确，我也会收到所有错误消息。

我正在使用 Express+Node+Mongodb+Mongoose。

我可以知道如何实现它。

我正在关注的相关（12:55 分钟）视频是 - https://www.youtube.com/watch?v=jeiP4jN1mfs&list=PLNiY_2deiFolObKp8sav6TmxnnjVFuwqu&index=16

这是我的代码 -

app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var expressValidator = require('express-validator');
var cookieParser = require('cookie-parser');
var session=require('express-session');
var passport=require('passport');
var LocalStrategy = require('passport-local').Strategy;
var bodyParser = require('body-parser');

var multer = require('multer');

var upload = multer( dest: './uploads' );
var flash = require('connect-flash');
var mongo = require('mongodb');
var mongoose = require('mongoose');
var db = mongoose.connection;

var index = require('./routes/index');
var users = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');


// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded( extended: false ));

//Handle Express Sessions
app.use(session(
    secret:'secret',
    saveUninitialized:true,
    resave:true
));

//Passport
app.use(passport.initialize());
app.use(passport.session());

//Validator
app.use(expressValidator(
  errorFormatter: function(param, msg, value) 
      var namespace = param.split('.')
      , root    = namespace.shift()
      , formParam = root;

    while(namespace.length) 
      formParam += '[' + namespace.shift() + ']';
    
    return 
      param : formParam,
      msg   : msg,
      value : value
    ;
  
));


app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use(flash());
app.use(function (req, res, next) 
  res.locals.messages = require('express-messages')(req, res);
  next();
);
app.use('/', index);
app.use('/users', users);

// catch 404 and forward to error handler
app.use(function(req, res, next) 
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
);

// error handler
app.use(function(err, req, res, next) 
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : ;

  // render the error page
  res.status(err.status || 500);
  res.render('error');
);

module.exports = app;

---

users.js（在路由文件夹内）

var express = require('express');
var router = express.Router();


var User = require('../models/user');
/* GET users listing. */
router.get('/', function(req, res, next) 
  res.send('respond with a resource');
);

router.get('/register', function(req, res, next) 
  res.render('register',
    'title': 'Register'
      );
);
router.get('/login', function(req, res, next) 
  res.render('login',
    'title': 'Login'
      );
);

router.post('/register',function(req,res,next)
    //Get form values
    var name=req.body.name;
    var email=req.body.email;
    var username=req.body.username;
    var password=req.body.password;
    var password2=req.body.password2;



    if(req.files && req.files.profileimage)
        console.log('Uploading FIle...');

        //FIle Info
        var profileImageOriginalName    = req.files.profileimage.originalname;
        var profileImageName            = req.files.profileimage.name;
        var profileImageMime            = req.files.profileimage.mimetype;
        var profileImagePath            = req.files.profileimage.path;
        var profileImageExt             = req.files.profileimage.extension;
        var profileImageSize            = req.files.profileimage.size;
     else
        // Set a Default Image
        var profileImageName = 'noimage.png';
    

    //Form Validation

    req.checkBody('name','Name field is required').notEmpty();
    req.checkBody('email','Email field is required').notEmpty();
    req.checkBody('email','Email not valid').isEmail();
    req.checkBody('username','Username field is required').notEmpty();
    req.checkBody('password','password field is required').notEmpty();
    req.checkBody('password2','passwords do not match').equals(req.body.password);

    //Check for errors
    var errors = req.validationErrors();

    if(errors)
        res.render('register',
            errors:errors,
            name:name,
            email:email,
            username:username,
            password:password,
            password2:password2
        );
    
    else
        var newUser = new User(
            name:name,
            email:email,
            username:username,
            password:password,
            profileimage:profileImageName

        );

        //Create User
        User.createUser(newUser, function(err,user)
            if(err) throw err;
            console.log(user);
        );

        //Success Messsage 
        req.flash('success','You are now registered and may log in');

        res.location('/');
        res.redirect('/');
    
);
module.exports = router;

---

views文件夹中的register.jade

extends layout

block content
    h1 Register
    p Please Register using the form below
    ul.errors
        if errors
            each error, i in errors
                li.alert.alert-danger #error.msg
    form(method='post',action='/users/register',enctype='multipart/form-data')
        .form-group
            label Name
            input.form-control(name='name', type='text',placeholder='Enter Name')
        .form-group
            label Email
            input.form-control(name='email', type='email',placeholder='Enter Email')
        .form-group
            label Username
            input.form-control(name='username', type='text',placeholder='User Name')
        .form-group
            label Password
            input.form-control(name='password', type='password',placeholder='Enter Password')
        .form-group
            label Confirm Password
            input.form-control(name='password2', type='password',placeholder='Confirm Password')
        .form-group
            label Profile Image
            input.form-control(name='profileimage', type='file')
        input.btn.btn-default(name='submit',type='submit',value='Register')

截图：

enter image description here

【参考方案1】：

来自 express github repo req.validationErrors([mapped]) 列在已弃用的 API 下 我引用他们 “以下方法已弃用。 虽然它们工作，但它们的 API 不灵活，如果与最前沿的 req.getValidationResult() 相比，有时会返回奇怪的结果。

此外，这些方法可能会在未来的版本中被移除。”

所以你应该改用这个方法：-

req.getValidationResult()
   .then(function(result)
     console.log(result.array());
   );

来源：-https://github.com/ctavan/express-validator#usage

【讨论】：

你能帮我提供更具体的答案吗？ @Fadi Abo Msalam

在文件 users.js（在路由文件夹内）替换 var errors = req.validationErrors();使用 req.getValidationResult() .then(function(result) you else -no error from validation - ) .catch(function(error) your code for handling error );这够清楚吗

这很清楚。非常感谢@Fadi Abo Msalam。

没问题，我的朋友，但如果解决方案有效，请将问题标记为已解决，以帮助他人。问候

实际上另一种方式现在不起作用。错误消息没有显示。我的 users.js 代码 sn-p 如下：