Dynamically add meta description based on route in Angular

Question

I\'m using Angular 5 to build a small brochure type website. Thus far, I have my routes set up, and the page title changes dynamically based on the activated route. I got th

Answer 1

Here are the relevant parts from my project. (Angular 2/4)

---

app-routing.module.ts:

Routes:

... const appRoutes: Routes = [
    {
        path: 'path1', loadChildren: './path1#path1Module',
        data: {
            title: '...',
            description: '...',
            keywords: '...'
        }
    },
    {
        path: 'path2', loadChildren: './path2#path2Module',
        data: {
            title: '...',
            description: '...',
            keywords: '...'
        }
    } ...

app.component.ts (or your bootstrap component):

imports:

// imports
import { Component, OnInit} from '@angular/core';
import { Router, ActivatedRoute, NavigationEnd } from '@angular/router';
import 'rxjs/add/operator/filter';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/mergeMap';
import { Title,Meta } from '@angular/platform-browser';

constructor:

    // constructor:
        constructor(private router: Router,
                    private route: ActivatedRoute,
                    private titleService: Title, private meta: Meta) {}

ngOnInit() method:

ngOnInit() {

        this.router.events
            .filter((event) => event instanceof NavigationEnd)
            .map(() => this.route)
            .map((route) => {
                while (route.firstChild) route = route.firstChild;
                return route;
            })
            .filter((route) => route.outlet === 'primary')
            .mergeMap((route) => route.data)
            .subscribe((event) => {
                this.updateDescription(event['description'], event['keywords'], event['title']);
            });

    }

method that updates title and meta tags -> called from ngOnInit():

updateDescription(desc: string, keywords: string, title: string) {
    this.titleService.setTitle(title);
    this.meta.updateTag({ name: 'description', content: desc })
    this.meta.updateTag({ name: 'keywords', content: keywords })
    this.meta.updateTag({ name: 'og:title', content: title })
    this.meta.updateTag({ name: 'og:description', content: desc })
}

Hope it helps.