角度 7 分鍾長度驗證錯誤未顯示反應形式

Question

表單驗證最小長度驗證錯誤未顯示我正在使用反應式表單

<div [formGroup]="subMerchant">
    <ion-item class="inputDesign">
            <ion-input placeholder="Enter Sub Merchant Mobile no" formControlName="SubMercMobileNo" type="tel" maxlength="10"></ion-input>
          </ion-item>
          <ion-text class="errorText" color="danger" *ngIf="subMerchant.controls.SubMercMobileNo.errors && submitted == true">
            <p [hidden]="!subMerchant.controls.SubMercMobileNo.errors.required">Mobile is required</p>
            <p [hidden]="!subMerchant.controls.SubMercMobileNo.errors.minlength">Enter minlength 10</p>
            <p [hidden]="!subMerchant.controls.SubMercMobileNo.errors.pattern">Enter valid is Mobile No</p>
          </ion-text>
</div>

  subMerchant: FormGroup;
 this.subMerchant = this.formBuilder.group({
      SubMercMobileNo: ['', Validators.compose([
        Validators.required,
        Validators.minLength(10),
        Validators.pattern("[0-9]{0-10}")
      ])],
 );

Answer 1

<div [formGroup]="subMerchant">
<ion-item class="inputDesign">
        <ion-input placeholder="Enter Sub Merchant Mobile no" formControlName="SubMercMobileNo" type="tel" minlength="10"></ion-input>
      </ion-item>
      <ion-text class="errorText" color="danger" *ngIf="subMerchant.controls.SubMercMobileNo.errors && submitted == true">
        <p [hidden]="!subMerchant.controls.SubMercMobileNo.errors.required">Mobile is required</p>
        <p [hidden]="!subMerchant.controls.SubMercMobileNo.errors.minlength">Enter minlength 10</p>
        <p [hidden]="!subMerchant.controls.SubMercMobileNo.errors.pattern">Enter valid is Mobile No</p>
      </ion-text>

Answer 2

您沒有在元素上使用 minlength="a number"