禁用 Angular 2 中的按钮

我想如果输入“合同类型”为空，则“保存”按钮不可点击

保存按钮：

<div class="col-md-4">
        <cic-textbox [control]="formGroup.get('contractType')"></cic-textbox>
      </div>

所有按钮：

 <div class="cic-header-actions pull-left" *ngIf="actions && actions.length > 
 0">
      <button class="btn btn-{{action.style}} m-l-xs" *ngFor="let action of actions" ng-disabled="!contractTypeValid" (click)="execute(action)">
          <cic-icon [icon]="action.icon"></cic-icon>
          {{action.text }}
        </button>
    </div>

定义合约类型：

 let contractType: DataDictionaryPropertyExtended = {
            Binding: 'VART:BEZEICHNUNG',
            Label: 'Vertragsart',
            LabelCols: 4,
            ContentCols: 8,
            IsDisabled: this.isDisabled,
            ValidationProperties: [
                <ValidationProperty>{
                    Type: ValidationType.IsNotEmpty,
                    ErrorMessage: 'Vertragsart darf nicht leer sein.',
                }
            ]
        };

按钮保存绿色：

Change ng-disabled="!contractTypeValid" to [disabled]="!contractTypeValid"