Angular 2表单验证,minLength验证器不起作用

Question

我有以下Angular 2形式:

<register>
    <form [ngFormModel] = "registrationForm">
        <div class = "form-group">
            <label class = "control-label" for="email">Email</label>
            <input class = "form-control" type="email" id="email" ngControl="email" #email="ngForm">
        </div>
        <div *ngIf = "email.touched && email.errors">
            <div *ngIf = "!email.errors.required && email.errors.underscoreNotFound" class = "alert alert-danger">
                <span>Underscore is required</span> 
            </div>
            <div *ngIf = "email.errors.required" class = "alert alert-danger">
                <span>Email is required</span>
            </div>
        </div>
        <div class = "form-group">
            <label class = "control-label" for="password">Password</label>
            <input class = "form-control" type="password" id="password" ngControl="password" #password="ngForm">
        </div>
        <div *ngIf = "password.touched && password.errors">
            <div *ngIf = "password.errors.minLength && !password.errors.required" class = "alert alert-danger">
                <span>Password should contain 6 characters</span>
            </div>  
            <div *ngIf = "password.errors.required" class = "alert alert-danger">
                <span>Password is required</span>
            </div>          
        </div>
    </form>
</register>

这是我实现验证器的组件:

import {Component} from '@angular/core';
import {Control, ControlGroup, FormBuilder, Validators} from '@angular/common';
import {CustomValidator} from './CustomValidator';

@Component({
    selector: 'register',
    templateUrl: './app/authentication/register_validation/register.html',
})

export class RegisterComponent{
    registrationForm: ControlGroup;

    constructor(formBuilder:FormBuilder)
    {
        this.registrationForm = formBuilder.group({
            email: ['',Validators.compose([Validators.required, CustomValidator.underscore])], 
            password: ['',Validators.compose([Validators.required,Validators.minLength(6)])]
        });
    }

}

在这种形式中,email字段对两个验证器都正常工作,即当我不输入任何内容时,它会给出"Email is required"消息,当我开始输入内容时,它会给出"Underscore is required"消息,当我输入"_"所有错误消息时消失.但是,当我尝试在password现场应用这样的2个验证器时,它不起作用.当我不输入密码时,它会给出消息"Password is required".但是当我输入少于6个字符的内容时,minLength根本不显示消息.这段代码有什么问题？

Answer 1

该错误是关键minlength,而不是minLength:

<div *ngIf = "password.hasError('minlength') && !password.hasError('required')" class = "alert alert-danger">
  <span>Password should contain 6 characters</span>
</div>  

Answer 2

这真的让我感到困惑,因为我将我的标记中的密钥与我在代码中的密钥相匹配.

示例代码

password1: ['', [Validators.required, Validators.minLength(8)]],

样本标记

*ngIf="registrationRequest.get('password1').hasError('minlength')"

在代码中注意它minlength完全是小写的.

Answer 3

我面临着同样的问题，但经过如此多的研究，我得到了一个解决方案，请使用minlength insted of minLength 这是示例。

<div *ngIf = "password.errors.minlength && !password.errors.required" class = "alert alert-danger">
      <span>Password should contain 6 characters</span>
    </div> 

代替

<div *ngIf = "password.errors.minLength && !password.errors.required" class = "alert alert-danger">
  <span>Password should contain 6 characters</span>
</div> 

希望这会帮助某人，谢谢

Answer 4

我遇到了同样的问题，我想验证一个包含年份的数字字段，所以我过去常常Validators.maxLength(4)确保有人不会在一年中意外输入 5 个数字。当您将输入类型设置为数字时，结果是：

<input type="number" formControlName='year'>

那么 maxLength 不再“工作”了。如果你想半秒钟，这实际上是有道理的。

所以我将日期输入更改为：

year: [null, [Validators.required, Validators.min(1990), Validators.max(2050)]],

使用数字字段时，哪种方法是正确的。