Angular2：根据点击事件给元素添加ngClass

Question

我希望 Clicked class 一次只应用于一个被点击的元素。单击其他元素后，第一个单击的元素不应再具有 class。它应该有点像那个特定元素的 this.clicked。

  .rangeContainer{
    width: 100%;
    height: 46px;
    }
    .range{
      height: 42px;
      background-color: #F6F6F6;
      color: #035688;
      font-size: 12px;
      font-weight: 800;
      line-height: 46px;
      padding: 15px 20px;
      cursor: pointer;
    }
    .clicked{
      background-color: white;
      color: #7A232E;
      border-top: 6px solid #7A232E;
    }
  
I want the

   
<div class="rangeContainer">
    <span (click)="click = !click" [ngClass]="{'clicked' : click}" class="range">K4 - K5</span>
    <span (click)="click = !click" [ngClass]="{'clicked' : click}"class="range">1ST - 2ND</span>
    <span (click)="click = !click" [ngClass]="{'clicked' : click}"class="range">3RD - 4TH</span>
    <span (click)="click = !click" [ngClass]="{'clicked' : click}"class="range">5TH - 8TH</span>
</div>

Answer 1

在组件中：

// Insert your real labels here
this.items = [{label: 'item 1'}, {label: 'item 2'}];

然后使用*ngFor:

<div class="rangeContainer">
    <span *ngFor="let item of items" (click)="toggleClick(item)" [ngClass]="{'clicked' :item.isClicked}" class="range">{{item.label}}</span>
</div>

然后像这样切换：

toggleClick(clickedItem: any): void {

  for (let item of items) {
    item.isClicked = false;
  }

  clickedItem.isClicked = true;
}

这将确保一次只能点击 1 个项目。我正在使用一个循环，所以我可以将点击状态存储在对象上。它让生活更轻松。

Answer 2

<span
  *ngFor="let range of ['K4 - K5', '1ST - 2ND', '3RD - 4TH', '5TH - 8TH']; let i = index"
  (click)="activeIndex = i"
  [ngClass]="{ clicked : activeIndex === i }" class="range" >
  {{ range }}
</span>

Plunker Example

Angular2：根据点击事件给元素添加ngClass

Angular 2: Adding ngClass to the element based on the click event

html

css

angular

ng-class