lms-app/src/app/tabs/courses/details/details.component.ts

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { Subscription } from 'rxjs';
import { Location } from '@angular/common';

@Component({
	selector: 'app-details',
	templateUrl: './details.component.html',
	styleUrls: ['./details.component.scss']
})
export class DetailsComponent implements OnInit {
    selectedSegment: string = 'forum';
    heading: string;
    routeSubscription: Subscription;
    selectedChapter: number = 1;
    showMorePostOptions: boolean = false;
    selectedPost: number;

	constructor(
        private route: ActivatedRoute,
        private location: Location
    ) { }

	ngOnInit(): void {
        this.routeSubscription = this.route.params.subscribe((params) => {
            this.heading = params['heading'];
        });
	}

    ngOnDestroy() {
        this.routeSubscription.unsubscribe();
    }

    back() {
        this.location.back();
    }

}