Using Angular 2 to Bind a Single Click Event to Multiple Elements

Within the component's export class, I have defined iconCheck: string;. In the constructor, I set this.iconCheck = "add_circle";. Additionally, in the export class, I have the following method:

iconChange() {
    if(this.iconCheck == "add_circle") {
      this.iconCheck = "remove_circle"
    } else {
      this.iconCheck = "add_circle";
    }
  }

My HTML contains multiple collapsible/expandable elements using Bootstrap accordions. Each element has a toggle icon (+/-) that should change when clicked. However, the issue is that when one accordion is clicked, all other accordions' icons also change. I am looking for a way to bind the click event to only the specific element that was clicked. Essentially, I need a scope limit or a way to isolate the click event to just the individual element that triggered it.

<a data-toggle="collapse" (click)="iconChange()" href="#collapse1">
 Property 1 
 <i class="material-icons pull-right">{{iconCheck}}</i>
</a> 

<a data-toggle="collapse" (click)="iconChange()" href="#collapse2">
 Property 2 
 <i class="material-icons pull-right">{{iconCheck}}</i>
</a>
angulartypescript

Answer №1

There have been instances where I faced this issue before. My go-to solution is to use an index to monitor which accordion the user has clicked on, and then utilize that information to toggle icons accordingly.

I've put together a straightforward Plunker demo. Take a look and see if it meets your requirements :)

app.ts:

export class App {
  name:string;

  selectedIndex: number;

  constructor() {
    this.name = `Angular! v${VERSION.full}`;
    this.selectedIndex = -1;
  }

  iconChange(index: number){
    if(this.selectedIndex == index){
      this.selectedIndex = -1;
    }
    else{
      this.selectedIndex = index;
    }

  }
}

Template:

<div>
  <h2>Hello {{name}}</h2>
  <div class="div1" (click)="iconChange(1)" >
    Hi 
      <i class="fa" [ngClass]="{'fa-plus': selectedIndex != 1, 'fa-minus': selectedIndex == 1}" aria-hidden="true" style="float: right"></i>
    </div>
  <div class="div2" (click)="iconChange(2)">
    Hi again!
      <i class="fa" [ngClass]="{'fa-plus': selectedIndex != 2, 'fa-minus': selectedIndex == 2}"  aria-hidden="true" style="float: right"></i>
  </div>
  <div class="div3" (click)="iconChange(3)">
    Bye!
      <i class="fa" [ngClass]="{'fa-plus': selectedIndex != 3, 'fa-minus': selectedIndex == 3}"  aria-hidden="true" style="float: right"></i>
  </div>
</div>

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