jquery - angular2 - bootstrap4 add class for selected custom radio button -


i got problem adding .selected class selected custom radio button using boostrap 4. here code:

app.component.html

<div class="list-item item-owner text-center selected"       [class.selected]="designation"      *ngfor="let titlelist of designations; let idx = index">   <p><strong>{{titlelist.title}}</strong></p>   <div class="item-icn icn-owner"></div>   <p class="tx-desc">     {{titlelist.description}}   </p>   <input class="type-owner" type="radio"          name="designationnewstaff"          [value]="owner"          [(ngmodel)]="owner" hidden/> </div>

app.component.ts

designations = []; this.designations = [{     value: 1,     data: 'owner',     title: 'owner',     description: 'manage staff accounts, receive, view &amp; void payment transactions stores',   },   {     value: 2,     data: 'supervisor',     title: 'outlet supervisor',     description: 'receive, view & void payment transaction in assigned outlet',   },   {     value: 3,     data: 'cashier',     title: 'outlet cashier',     description: 'receive, view & void payment transaction in assigned outlet',   } ];


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