响应式表单校验（angular自带校验和自定义校验规则）

import { Component, OnInit } from '@angular/core';
import { FormBuilder, Validators, FormControl, FormGroup } from '@angular/forms';
import { fbind } from 'q';

@Component({
  selector: 'app-form5',
  templateUrl: './form5.component.html',
  styleUrls: ['./form5.component.css']
})
export class Form5Component implements OnInit {

    constructor(private fb: FormBuilder) { }

    formModel = this.fb.group({
        username: ['', [
            Validators.required,
            Validators.minLength(6)
        ]],
        mobile: ['', this.mobileValidator],
        passwordsGroup: this.fb.group({
            password: [''],
            pconfirm: ['']
        }, {
            validator: this.equalValidator
        })
    });

    // 自定义校验器
    /**
     * control: 参数类型可以为：FormGroup,FormControl,FormArray，返回一个对象
     * xxx(control: AbstractControl): {[key: string]: any} {
     *      return null;
     * }
     */

    //  验证手机号——单一字段
    mobileValidator(control: FormControl): any {
        const regs = /^((13[0-9])|(17[0-1,6-8])|(15[^4,\\D])|(18[0-9]))\d{8}$/;
        const valid = regs.test(control.value);
        console.log('mobile的校验结果是：' , valid);
        return valid ? null : {mobile: true};
    }

    // 校验确认密码——同时校验几个字段
    equalValidator(group: FormGroup): any {
        const password: FormControl = group.get('password') as FormControl;
        const pconfirm: FormControl = group.get('pconfirm') as FormControl;
        const valid: boolean = (password.value === pconfirm.value);
        console.log('密码校验结果：' + valid);
        return valid ? null : {equal: true};
    }


    ngOnInit() {
    }

    onSubmit() {
        // 获取校验信息
        const info = this.formModel.get('username');
        console.log('校验信息' , info);

        // 获取校验结果
        const isValide = this.formModel.get('username').valid;
        console.log('校验结果' , isValide);

        // 获取错误信息
        const error = this.formModel.get('username').errors;
        console.log('错误信息' , error);

        // 只有当formModel中所有的字段都是合法条件
        if (this.formModel.valid) {
            console.log(this.formModel.value);
        }
    }

}

<form [formGroup]="formModel" (ngSubmit)="onSubmit()">
    <div>
        用户名：<input type="text" formControlName="username">
    </div>
    <div>
        手机号：<input type="number" formControlName="mobile">
    </div>
    <div formGroupName="passwordsGroup">
        <div>
            密码：<input type="password" formControlName="password">
        </div>
        <div>
            确认密码：<input type="password" formControlName="pconfirm">
        </div>
    </div>
    <button>注册</button>
</form>

将自定义校验规则抽离到单独的文件

例如：validator/validators.ts

import { FormControl, FormGroup } from '@angular/forms';

//  验证手机号——单一字段
export function mobileValidator(control: FormControl): any {
    const regs = /^((13[0-9])|(17[0-1,6-8])|(15[^4,\\D])|(18[0-9]))\d{8}$/;
    const valid = regs.test(control.value);
    console.log('mobile的校验结果是：' , valid);
    return valid ? null : {mobile: true};
}

// 校验确认密码——同时校验几个字段
export function equalValidator(group: FormGroup): any {
    const password: FormControl = group.get('password') as FormControl;
    const pconfirm: FormControl = group.get('pconfirm') as FormControl;
    const valid: boolean = (password.value === pconfirm.value);
    console.log('密码校验结果：' + valid);
    return valid ? null : {equal: {descxxx: '密码和确认密码不匹配'}};
}

使用：form5.component.ts

import { mobileValidator, equalValidator } from 'src/app/validator/validators';
constructor(private fb: FormBuilder) { }

formModel = this.fb.group({
   username: ['', [
       Validators.required,
       Validators.minLength(6)
   ]],
   mobile: ['', mobileValidator],
   passwordsGroup: this.fb.group({
       password: [''],
       pconfirm: ['']
   }, {
       validator: equalValidator
   })
});

html:

<form [formGroup]="formModel" (ngSubmit)="onSubmit()">
  <div>
      用户名：<input type="text" formControlName="username">
  </div>
  <div [hidden]="!formModel.hasError('required', 'username')">用户名是必填项</div>
  <div [hidden]="!formModel.hasError('minlength', 'username')">用户名最小长度是6</div>
  <div>
      手机号：<input type="number" formControlName="mobile">
  </div>
  <div [hidden]="!formModel.hasError('mobile', 'mobile')">手机号格式不正确</div>
  <div formGroupName="passwordsGroup">
      <div>
          密码：<input type="password" formControlName="password">
      </div>
      <div [hidden]="!formModel.hasError('minlength', ['passwordsGroup', 'password'])">密码最小长度是6</div>
      <div>
          确认密码：<input type="password" formControlName="pconfirm">
      </div>
      <div [hidden]="!formModel.hasError('equal', 'passwordsGroup')">
        {{formModel.getError('equal', 'passwordsGroup') ?.descxxx}}
      </div>
  </div>
  <button>注册</button>
</form>

异步校验器

在formControl的第三个参数调用。

//  异步校验器
export function mobileAsyncValidator(control: FormControl): any {
  const regs = /^((13[0-9])|(17[0-1,6-8])|(15[^4,\\D])|(18[0-9]))\d{8}$/;
  const valid = regs.test(control.value);
  console.log('mobile的校验结果是：' , valid);
  return Observable.of(valid ? null : {mobile: true}).delay(5000);
}