如何解决 NODEJS 的错误消息问题

Question

我在注册表格时遇到问题，当我点击提交并完成所有字段并且电子邮件（已经在数据库中）时，表格被重置，然后第二次点击错误消息（电子邮件已经在数据库中并且其他味精...）出现..什么问题？

router.post('/register', function(req, res) {
  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;

  req.checkBody('username', 'Veuillez renseigner un identifiant').notEmpty();
  req.checkBody('email', 'Veuillez renseigner une adresse email valide').isEmail();
  req.checkBody('password', 'Veuillez renseigner un mot de passe').notEmpty();
  req.checkBody('password2', 'Les mots de passe ne correspondent pas').equals(req.body.password);

  var errors = req.validationErrors();

  if(errors) {
    res.render('register', {errors:errors});
  } else {
    User.findOne({ email: email }).then(user => {
      if (user) {
        req.flash('error_msg','EMAIL ALREADY IN DB');
        res.render('register', {errors:errors});
  } else {
    var newUser = new User({
      email: email,
      username: username,
      password: password
    });
      User.createUser(newUser, (err,user) => {
        if(err) throw err;
        console.log(user)
      })
      req.flash('success_msg','u can now log u account is created')
      res.redirect('/users/login') 
      }
    });
  }
});

感谢您的帮助:)

Answer 1

似乎您没有等待 createUser 回调函数在您之前响应 验证一切是否成功。

Answer 2

如 GisliBG 所示，您必须等待 CreateUser 回调；这意味着，您需要将 createUser 完成工作后需要执行的代码放在回调中：这是异步代码的一般规则/行为：

试试这个：

User.createUser(newUser, (err,user) => {
        if(err) throw err;
        console.log(user);

        req.flash('success_msg','u can now log u account is created');
        res.redirect('/users/login');
      })

Answer 3

更新！它像这样工作，但是当我输入重复的电子邮件而不是密码时，只有电子邮件错误消息，除此之外的所有工作

这是我的注册文件

{{#if errors}}
  {{#each errors}}
    <div class="alert alert-danger">{{msg}}</div>
  {{/each}}
{{/if}}
{{#if error}}
  {{#each error}}
    <div class="alert alert-danger"></div>
  {{/each}}
{{/if}}

<h2 class="page-header">Register</h2><br>
<form action="/users/register" method="post">
  <div class="form-group">
    <label for="username">Username</label>
    <input type="text" class="form-control" placeholder="Username" name="username">
    </label>
  </div>
  <div class="form-group">
    <label for="email">Email</label>
    <input type="text" class="form-control" placeholder="Email" name="email">
    </label>
  </div>
  <div class="form-group">
    <label for="password">Password</label>
    <input type="password" class="form-control" placeholder="Password" name="password">
    </label>
  </div>
  <div class="form-group">
    <label for="password2">Confirm Password</label>
    <input type="password" class="form-control" placeholder="Password" name="password2">
    </label>
  </div>
  <button class="btn btn-primary" type="submit">Submit</button>
</form>

还有我的 users.js 文件（未满）

router.post('/register', function(req, res) {
  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;

  req.checkBody('username', 'Veuillez renseigner un identifiant').notEmpty();
  req.checkBody('email', 'Veuillez renseigner une adresse email valide').isEmail();
  req.checkBody('password', 'Veuillez renseigner un mot de passe').notEmpty();
  req.checkBody('password2', 'Les mots de passe ne correspondent pas').equals(req.body.password);

  var errors = req.validationErrors();
  var error = 'email not available'

  if(errors) {
    res.render('register', {errors: errors})
  } else {
    User.findOne({ email: email })
      .then(user => {
        if(user) {
          //USER EXIST
          res.render('register', {errors: errors, error: error})
        } else {
          var newUser = new User({
            email: email,
            username: username,
            password: password
        });
        User.createUser(newUser, (err,user) => {
          if(err) throw err;
          console.log(user);

          req.flash('success_msg','u can now log u account is created');
          res.redirect('/users/login');
        })
        }
      })
    }
  });