在Angular中删除行时禁用保存按钮

时间:2017-10-23 13:46:31

标签: angular angular-reactive-forms angular-forms angular-validation

如果在活动表单中删除行,我怎么能够禁用提交按钮。我很困惑,因为我可以通过编写validators.required来处理表单,但如果行被删除,如何禁用提交按钮?代码如下。

  

HTML

<form class="form-horizontal" [formGroup]="myForm" (ngSubmit)="onCreate()" >
  <div class="card-block" formArrayName="rows">
    <table class="table table-bordered table-striped">
      <thead>
        <tr>
          <th>Material SKU</th>
          <th>Quantity</th>
          <th>Price</th>
          <th>Total</th>
          <th>Action</th>
        </tr>
      </thead>
      <tbody>
        <tr *ngFor="let row of myForm.controls.rows.controls; let i = index" [formGroupName]="i">
          <td>
            <select formControlName="material_id" class="col-md-10">
              <option *ngFor="let mat_order of mat_orders" [ngValue]="mat_order.material_id">
                {{ mat_order.sku}} - {{ mat_order.mat_name }} 
              </option>
            </select>
          </td>
          <td><input type="number" class="col-md-6" formControlName="quantity"></td>
          <td><input type="number" class="col-md-6" formControlName="price"></td>
          <td><input type="number" class="col-md-6" formControlName="total"  [ngModel] ="row.get('quantity').value * row.get('price').value"></td>
          <td>
            <button type="button" class="btn btn-sm btn-danger" (click)="onDeleteRow(i)"><i class="fa fa-trash-o" aria-hidden="true"></i> Remove</button>
          </td>
        </tr>
      </tbody>
    </table>

    <button type="button" class="btn btn-sm btn-primary float-left" (click)="initGroup()"><i class="fa fa-plus-circle" aria-hidden="true"></i>  Add Row</button>
  </div> 
  <button type="submit" class="btn btn-primary float-right" [disabled]="!myForm.valid">Save</button>
</form>
  

TS

initGroup() {
    let rows = this.myForm.get('rows') as FormArray;
    rows.push(this.fb.group({
      material_id: [null, Validators.required],
      quantity: [null, Validators.required],
      price: [null, Validators.required],
      total: [{value: '', disabled: true}, Validators.required],
    }))
  }




this.myForm = this.fb.group({
      rows: this.fb.array([])
    })

4 个答案:

答案 0 :(得分:1)

作为问题的解决方案,如果您调用方法boolean,则可以设置true onDeleteRow(i)

deleted : boolean = false;
onDeleteRow(i){
   this.deleted = true;
  //...
} 

在按钮中,您将检查deleted是否为false且行是否为空:

  <button type="submit" class="btn btn-primary float-right" [disabled]="!myForm.valid || myForm.controls.rows.length == 0 || deleted ">Save</button>

希望它有所帮助:)

答案 1 :(得分:0)

与此同时

[disabled]="!myForm.valid"

你也可以把

[disabled]="!myForm.valid || myForm.pristine"

答案 2 :(得分:0)

在每个更改的值之后,检查您的表单是否有效。如果是,则将 saveButton 设置为true。 在创建表单后添加此代码:

this.myForm.valueChanges.subscribe((item: any) => {
       // item is changed
       if (this.form.valid) { this.saveButton = true; }
       else { this.saveButton = false; }
});

在模板中 [禁用] =“saveButton”

<button type="submit" class="btn btn-primary float-right" [disabled]="saveButton">Save</button>

答案 3 :(得分:-1)

你可以添加(在html中): {+ 1}}到你的按钮

编辑:

我以为你会定制你的条件:我的意思是, 您可以在此处添加任何条件,因此您可以添加:[disabled]="myForm.invalid"

您甚至可以为您需要的确切行为创建一个变量:例如,您可以在点击时添加Click事件: [disabled]="myForm.invalid || myForm.controls.rows.controls.length == 0" 然后 :  (click)="onDeleteRow(i); deletedRow = true;"