funky-framadate-front/src/app/app.component.ts

import {Component, Inject} from '@angular/core';
import {TranslateService} from '@ngx-translate/core';
import {NavigationStart, Router} from '@angular/router';
import {DOCUMENT} from '@angular/common';
import {filter} from 'rxjs/operators';
import {ConfigService} from './services/config.service';
import {environment} from '../environments/environment';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.scss']
})
export class AppComponent {

    step: string;
    isDevelopmentEnv=false;

    constructor(private translate: TranslateService,
                public config: ConfigService,
                @Inject(DOCUMENT) private document,
                private route: Router) {
        this.detectCurrentTabOnRouteChange();
        this.findLocalStoragePreferences();

        this.isDevelopmentEnv = !environment.production
    }

    detectCurrentTabOnRouteChange() {
        this.route.events.subscribe((event: any) => {


        });
        this.route.events.pipe(filter(event => event instanceof NavigationStart)).subscribe((event: NavigationStart) => {
            this.scrollGoToTop();
            this.updateCurrentTab(event);
            // only if there is a poll ID
            this.config.fetchPollFromRoute(event);
        })

    }


    scrollGoToTop() {
        this.document.documentElement.scrollTop = 0;
    }

    updateCurrentTab(event) {
        if (event.url) {
            const tab = event.url.split('/');
            if (tab && tab[2]) {
                this.step = tab[2];
            } else {
                this.step = 'home';
            }
        }
    }

    public findLocalStoragePreferences() {
        const storage = window.localStorage;

        if ( storage ){
            const preferences = storage.getItem('FramadateConfig');

        }
    }

}