在 Angular 4 响应式表单中提交时显示验证消息 [英] Show Validation Message on submit in Angular 4 Reactive Forms

问题描述

我正在使用 Angular 4，反应式表单.我想在用户单击提交/创建帐户"按钮时显示验证错误消息.这是我正在使用的 HTML 和打字稿代码.

<div class="form-group"><输入类型="文本"id="名字"名字=名字"表单控件名称=名字"占位符=名字"><span *ngIf="!signupForm.get('firstname').valid && signupForm.get('firstname').touched"类=帮助块">请输入名字(最少 2 个字符)</span>

<div class="form-group"><输入类型="文本"id="姓氏"姓名=姓氏"formControlName="姓氏"占位符="姓氏"><span *ngIf="!signupForm.get('lastname').valid && signupForm.get('lastname').touched"类=帮助块">请输入姓氏(最少 2 个字符)</span>

<div class="form-group"><按钮类型=提交"class="btn btn-success btn-lg btn-qte">创建帐户</button>

</表单>

<小时>

类型脚本代码

<小时>

导出类 UserRegistrationComponent 实现 OnInit {注册表格:表格组；ngOnInit() {this.signupForm = new FormGroup({'firstname': new FormControl(null, [Validators.required, Validators.minLength(2)]),'lastname': new FormControl(null, [Validators.required, Validators.minLength(2),]),'businessname':新的FormControl(空)，'phonenumber': new FormControl(null, [Validators.required]),'email': new FormControl(null, [Validators.required, Validators.email]),'密码': new FormControl(null, [Validators.required]),'confirmpassword': new FormControl(null, Validators.required)});}提交(){console.log(this.signupForm)}}

解决方案

类似的东西

onSubmit() {console.log(this.signupForm)this.signupForm.controls['firstname'].markAsTouched()}

I am using Angular 4, Reactive forms.I want to show validation error message when the user clicks on Submit/Create Account button. Here is the HTML and typescript code that I am using.

<form [formGroup]="signupForm" (ngSubmit)="onSubmit()">

  <div class="form-group">
    <input type="text" 
           id="firstname" 
           name="firstname" 
           formControlName="firstname" 
           placeholder="First Name">
    <span *ngIf="!signupForm.get('firstname').valid && signupForm.get('firstname').touched" 
           class="help-block"> Please Enter First Name (Minimum 2 Characters)</span>
  </div>

  <div class="form-group">
    <input type="text" 
           id="lastname" 
           name="lastname" 
           formControlName="lastname" 
           placeholder="Last Name">
    <span *ngIf="!signupForm.get('lastname').valid && signupForm.get('lastname').touched" 
           class="help-block"> Please Enter Last Name (Minimum 2 Characters)</span>
  </div>

  <div class="form-group">
    <button type="submit" 
            class="btn btn-success btn-lg btn-qte">Create Account</button>
  </div>

</form>

---

TYPE SCRIPT CODE

---

export class UserRegistrationComponent implements OnInit {
    signupForm: FormGroup;

    ngOnInit() {
        this.signupForm = new FormGroup({
            'firstname': new FormControl(null, [Validators.required, Validators.minLength(2)]),
            'lastname': new FormControl(null, [Validators.required, Validators.minLength(2),]),
            'businessname': new FormControl(null),
            'phonenumber': new FormControl(null, [Validators.required]),
            'email': new FormControl(null, [Validators.required, Validators.email]),
            'password': new FormControl(null, [Validators.required]),
            'confirmpassword': new FormControl(null, Validators.required)

        });
    }

    onSubmit() {
        console.log(this.signupForm)
    }

}

解决方案

Something like

onSubmit() {
    console.log(this.signupForm)
    this.signupForm.controls['firstname'].markAsTouched()
}

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