Angular:有条件地触发选择性表单验证

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

@Component({
  selector: 'app-form',
  template: `
    <form [formGroup]="myForm">
      <input formControlName="name" placeholder="Name">
      <input formControlName="email" placeholder="Email">
    </form>
  `,
})
export class MyFormComponent {
  myForm: FormGroup;

  constructor() {
    this.myForm = new FormGroup({
      name: new FormControl('', Validators.required),
      email: new FormControl('', Validators.email),
    });
  }
}

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

@Component({
  selector: 'app-form',
  template: `
    <form [formGroup]="myForm">
      <input formControlName="name" placeholder="Name">
      <input formControlName="email" placeholder="Email">
      <button (click)="submit()">Submit</button>
    </form>
  `,
})
export class MyFormComponent {
  myForm: FormGroup;

  constructor() {
    this.myForm = new FormGroup({
      name: new FormControl('', Validators.required),
      email: new FormControl('', Validators.email),
    });
  }

  submit() {
    if (condition) {
      this.myForm.controls['name'].markAsTouched();
    }
  }
}