Angular实现表单验证功能(2)

*{
  font-size: 18px;
}
.wrapper{
  margin: 0 auto;
  margin-top:10%;
  width:30%;
  height: 20%;
  border:1px solid black;
  border-radius: 10px;
}

.title-wrapper{
  margin: 0 auto;
  padding-top: 20px; 
  padding-bottom: 20px;
  width:370px;
  text-align: center;
  font-size: 20px;
  font-weight: 800;
}
label{
  display: inline-block;
  width:72px;
}
.contain-wrapper{
  width: 300px;
  margin:0 auto;
}
.confirm{
  margin-top:20px;
  width:100%;

}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule,ReactiveFormsModule }  from '@angular/forms';
import { EmailValidatorDirective } from './emailAuthentication';

import { AppComponent } from './app.component';

@NgModule({
 declarations: [
  AppComponent,
  EmailValidatorDirective
 ],
 imports: [
  BrowserModule,
  FormsModule,
  ReactiveFormsModule
 ],
 providers: [],
 bootstrap: [AppComponent]
})
export class AppModule { }

import { Directive, Input, OnChanges, SimpleChanges } from '@angular/core';
import { AbstractControl, NG_VALIDATORS, Validator, ValidatorFn, Validators } from '@angular/forms';

/** A hero's name can't match the given regular expression */
export function emailValidator(nameRe: RegExp): ValidatorFn {
  return (control: AbstractControl): { [key: string]: any } => {
    const forbidden = !nameRe.test(control.value);
    return forbidden ? { 'forbiddenName': { value: control.value } } : null;
  };
}

@Directive({
  selector: '[appForbiddenName]',
  providers: [{ provide: NG_VALIDATORS, useExisting: EmailValidatorDirective, multi: true }]
})
export class EmailValidatorDirective implements Validator {
  @Input() forbiddenName: string;

  validate(control: AbstractControl): { [key: string]: any } {
    return this.forbiddenName ? emailValidator(new RegExp(this.forbiddenName, 'i'))(control)
      : null;
  }
}

import { Component,OnInit } from '@angular/core';
import { FormGroup, FormControl, Validators } from '@angular/forms';
import { emailValidator } from './emailAuthentication'; //导入emailValidator自定义验证器

@Component({
 selector: 'app-root',
 templateUrl: './app.component.html',
 styleUrls: ['./app.component.css']
})
export class AppComponent {
 title = 'app';
 //email的正则表达式
 emailExp = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/ ;
 Form:FormGroup;
 data={
   name:"",
   email:"",
   tel:""
 }
 ngOnInit(): void {
   this.Form = new FormGroup({
      'name': new FormControl(this.data.name, [
       Validators.required,
       Validators.minLength(4)
      ]),
      'email': new FormControl(this.data.email, [
        Validators.required,
        emailValidator(this.emailExp) //自定义验证器
        ]),
      'tel': new FormControl(this.data.tel, Validators.required)
     });
  }

  get name() { return this.Form.get('name'); }
  get email() { return this.Form.get('email'); }
  get tel() { return this.Form.get('tel'); }
}