Angular模板表单校验方法详解

ng g directive directives/mobileValidator　

<form #myForm="ngForm" (ngSubmit)="onSubmit2(myForm.value, myForm.valid)"> <div> <h3>登录</h3> </div> <div>用户名：<input ngModel required name="username" type="text" (input)="onMobileInput(myForm)"></div> <div [hidden]="mobileValid || moblieUntouched">  <div [hidden]="!myForm.form.hasError('required','username')">  用户名是必填项  </div> </div>  <div>电话： <input ngModel mobile name="mobile" type="text"></div> <button type="submit">登录</button></form>

mobileValid: boolean = true;moblieUntouched: boolean = true; onMobileInput(form: NgForm) { if (form) { this.mobileValid = form.form.get('mobile').valid; this.moblieUntouched = form.form.get('mobile').untouched; }}