import { Component, OnInit } from '@angular/core'; @Component ({ selector: 'app-compatibility-validation', templateUrl: 'compatibility-validate.component.html' }) export class CompatibilityValidateComponent implements OnInit { constructor() {} ngOnInit() { let body = document.getElementsByTagName('body')[0]; body.classList.remove("top_bar_active"); //remove the class body.classList.remove("page_heading_active"); body.classList.remove("landing"); body.classList.add("dashboard"); } }