angular2 - FormGroup验证不触发

Question

我在表单中有一个FormGroup。当我单击提交按钮时，我需要验证FormGroup控件，但它不会触发。 TransactionForm是表单，allocationForm是FormGroup。单击添加按钮，我需要验证FormGroup单独。必需的字段验证不会触发。

component.ts

this.transactionForm = this.fb.group({
  allocationForm: this.fb.group({
    fund: new FormControl(['', Validators.required]),
    amount: new FormControl(['', Validators.required]),
  })
});

HTML

<form novalidate *ngIf="transactionForm" [formGroup]="transactionForm" (ngSubmit)="submitTransaction()">
  <div class="form-group">
    <label for="name">name:</label>
    <input type="text" class="form-control" formControlName="name">
    <br/>
  </div>
  <fieldset formGroupName="allocationForm">
    <div class="form-group row">
      <label for="amount" class="col-lg-4 col-form-label">    {{labels.percent}}</label>
      <div class="col-lg-8">
        <input name="amount" type="number" class="form-control" placeholder="" min="1" step="1" formControlName="amount" required>
        <div class="form-control-feedback" *ngIf="errors.amount">
          errors.amount
        </div>
      </div>
    </div>
    <div class="form-group row">
      <div class="offset-lg-4 col-lg-8">
        <button type="button" class="btn btn-secondary" class="form-control" name="addButton" type="submit">Add</button>
      </div>
    </div>
  </fieldset>
</form>

Answer 1

在您的代码

行

     <input name="amount" type="number" class="form-control" placeholder="" min="1" step="1" formControlName="amount" required>

在div标签之后你使用了错误的条件， 它应该是* ngIf =＆＃34; name.errors。＆lt;＆gt;＆＃34;， 例： * ngIf =＆＃34; amount.errors.min＆＃34 ;. 希望它有所帮助