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如果列表/数组不为空,如何禁用角度按钮?

angular-services css-selectors angular html javascript

Roxy'Pro · 技术社区 · 6 年前

在我的组件中,我从我的服务中获取数据:

ngOnInit() {
  this._sharedService.
    getReceiptItem().takeUntil(this.ngUnsubscribe).
    subscribe(products => this.receiptItems = products);
}

如果我的数组 this.receiptItems 有什么东西吗?

我试过这样的方法:

 <div class="top-left">
    <button [disabled]="receiptItems.count>0" type="button" [routerLink]="['/administration']"><i class="fas fa-bars fa-fw"></i></button>
 </div>

但不经意间,这不是一个解决办法。

谢谢

4 回复 | 直到 6 年前

Sajeetharan 6 年前

Array.length

   <button [disabled]="receiptItems.length>0" type="button" [routerLink]="['/administration']"><i class="fas fa-bars fa-fw"></i></button>

Krishna Rathore 6 年前

length

receiptItems:Array<any>;
ngOnInit() {
  this._sharedService.
    getReceiptItem().takeUntil(this.ngUnsubscribe).
    subscribe(products => this.receiptItems = products);
}

<div class="top-left">
    <button [disabled]="receiptItems.length > 0" type="button" [routerLink]="['/administration']"><i class="fas fa-bars fa-fw"></i></button>
 </div>

Super User 6 年前

<div class="top-left">
    <button [disabled]="receiptItems && receiptItems.length>0" type="button" [routerLink]="['/administration']"><i class="fas fa-bars fa-fw"></i></button>
 </div>

Roopesh Kumar Ramesh 6 年前

<button *ngIf="receiptItems!=undefined" [disabled]="receiptItems.length>0" type="button" [routerLink]="['/administration']"><i class="fas fa-bars fa-fw"></i></button>

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