How to get previous page details in page change event on embedded PowerBI report

In Power Bi, there is challenge to get page details when changing the pages. In Angular/JavaScript, powerBI client provides event handling to manage this. For this page changes, we have "pageChanged" event. Below sample code will help us to get events on page changes, so that you can capture bookmark if needed on previous page names etc.,

Sample Code: 

import { service, factories } from "powerbi-client";

const powerBI= new service.Service(factories.hpmFactory, factories.wpmpFactory, factories.routerFactory);

....

let currentSelectedPage = any = null;

let pbiElement = document.getElementById(“yourdivid”);

let pbiconfig = : any = {

    type: 'report',

    hostName: "https://app.powerbi.com/",

    accessToken: "",

    embedUrl: "",

    id: "",

    settings: {

      filterPaneEnabled: false,

      navContentPaneEnabled: false

    }

  }

this.report =  powerBI.embed(pbiElement, pbiconfig);

this.report.on('pageChanged', (event) => {

      

     console.log('Page changed Old:', event.detail.oldPage);

    

    //If event.detail.oldPage is not working then go with custom logic 

    //if (this.currentSelectedPage)

    //console.log('Page changed Old:', this.currentSelectedPage.displayName);  

    //set changed page into existing variables

    //this.currentSelectedPage = event.detail.newPage;

      console.log('Page changed New:', this.currentSelectedPage.displayName);

});