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javascript - 如何在按钮单击时显示验证消息？

问题描述

你能告诉我如何在按钮点击时显示验证信息吗？这是我的代码 https://stackblitz.com/edit/angular-ugdbvg?file=src/app/app.component.html

我想在用户按下按钮required时显示错误消息。submit

  <form novalidate [formGroup]="searchForm" class="calform">
      <section class="col-sm-6 bg-white  pl-20 pr-20">

      <div class="form-group col-sm-4 pl-0 error">
          <label class="field-title mb-5">name<span class="color-red fontWt">&nbsp;*</span></label>
          <input type="text" placeholder="Enter name" formControlName="name">
          <p class="message" [hidden]="searchForm.get('name')">Required</p>
        </div>

        <div class="form-group col-sm-4 pl-0 error">
          <label class="field-title mb-5">last name <span class="color-red fontWt">&nbsp;*</span></label>
          <input type="text" placeholder="Enter last name" formControlName="lastName">
          <p class="message" [hidden]="searchForm.get('lastName')">Required</p>
        </div>
        <button (click)="submitHandler()">submit</button>
      </section>
    </form>

js

this.searchForm = this.fb.group({
      name: ['', Validators.required],
          lastName: ['', Validators.required]

    });

标签： javascriptangularangular-reactive-forms

解决方案

添加以下行进行检查： 

<span class="error" *ngIf="!!searchForm.controls.name.errors.required && (!!searchForm.controls.name.dirty || !!searchForm.controls.name.touched)">
    Name is required.
</span> 
<span class="error" *ngIf="!!searchForm.controls.lastName.errors.required && (!!searchForm.controls.lastName.dirty || !!searchForm.controls.name.touched)">
    lastName is required.
</span>

在您的 ts 文件中： 

submitHandler() {
    if(this.searchForm.valid) {
        // Logic
    }
}

https://stackblitz.com/edit/angular-utvw23

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