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<span>2020-12-02 17:49</span>
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<p>Since Angular4, you can use Angular Meta service.
</p>
<pre><code>import { Meta } from '@angular/platform-browser';
// [...]
constructor(private meta: Meta) {}
// [...]
this.meta.addTag({ name: 'robots', content: 'noindex' });
</code></pre>
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<p>It is possible. I implemented it in my app and below I provide the description how it is made.</p>
<p>The basic idea is to use <code>Meta</code> from <code>@angular/platform-browser</code></p>
<p>To dynamically change particular meta tag you have to:</p>
<ol>
<li>Remove the old one using <code>removeTag(attrSelector: string) : void</code>
method.</li>
<li>Add the new one using <code>addTag(tag: MetaDefinition, forceCreation?:
boolean) : HTMLMetaElement</code> method.</li>
</ol>
<p>And you have to do it when the router fires route change event.</p>
<p>Notice: In fact it is also necessary to have default <code><title>...</title></code> and <code><meta name="description"..." content="..."/></code> in head of index.html so before it is set dynamically there is already some static content.</p>
<p>My <code>app-routing.module.ts</code> content:</p>
<pre><code>import 'rxjs/add/operator/filter';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/mergeMap';
import { NgModule } from '@angular/core';
import { RouterModule, Routes, Router, NavigationEnd, ActivatedRoute } from '@angular/router';
import { StringComparisonComponent } from '../module-string-comparison/string-comparison.component';
import { ClockCalculatorComponent } from '../module-clock-calculator/clock-calculator.component';
import { Title, Meta } from '@angular/platform-browser';
const routes: Routes = [
{
path: '', redirectTo: '/string-comparison', pathMatch: 'full',
data: { title: 'String comparison title', metaDescription: 'String comparison meta description content' }
},
{
path: 'string-comparison', component: StringComparisonComponent,
data: { title: 'String comparison title', metaDescription: 'String comparison meta description content' }
},
{
path: 'clock-time-calculator', component: ClockCalculatorComponent,
data: { title: 'Clock time calculator title', metaDescription: 'Clock time calculator meta description content' }
}
];
@NgModule({
imports: [ RouterModule.forRoot(routes) ],
exports: [ RouterModule ]
})
export class AppRoutingModule {
constructor(
private router: Router,
private activatedRoute: ActivatedRoute,
private titleService: Title,
private metaService: Meta
){
//Boilerplate code to filter out only important router events and to pull out data object field from each route
this.router.events
.filter(event => event instanceof NavigationEnd)
.map(() => this.activatedRoute)
.map(route => {
while (route.firstChild) route = route.firstChild;
return route;
})
.filter(route => route.outlet === 'primary')
//Data fields are merged so we can use them directly to take title and metaDescription for each route from them
.mergeMap(route => route.data)
//Real action starts there
.subscribe((event) => {
//Changing title
this.titleService.setTitle(event['title']);
//Changing meta with name="description"
var tag = { name: 'description', content: event['metaDescription'] };
let attributeSelector : string = 'name="description"';
this.metaService.removeTag(attributeSelector);
this.metaService.addTag(tag, false);
});
}
}
</code></pre>
<ol>
<li>As it can be seen there is an additional <code>data</code> object field for
each route. It contains <code>title</code> and <code>metaDescription</code> strings
which will be used as title and meta tag content.</li>
<li>In constructor we filter out router events and we subscribe to filtered
router event. Rxjs is used there, but in fact it is not necessary to use it. Regular <code>if statements</code> and <code>loops</code> could be used insead of stream, filter and map.</li>
<li>We also merge our data object field with our event so we can easily
use info like <code>title</code> and <code>metaDescription</code> strings.</li>
<li>We dynamically change <code><title>...</title></code> and <code><meta name="description"..." content="..."/></code> tags.</li>
</ol>
<p>Effects:</p>
<p>First component
</p>
<p>Second component
</p>
<p>In fact I currently use a little bit more sophisticated version of this solution which uses also ngx-translate to show different title and meta description for different languages.<br>
Full code is available in angular2-bootstrap-translate-website-starter project.<br>
The <code>app-routing.module.ts</code> file with ngx-translate solution is exactly there: app-routing.module.ts.</p>
<p>There is also the production app which uses the same solution: http://www.online-utils.com.</p>
<p>For sure it is not the only way and there might be better ways to do it. But I tested this solution and it works.</p>
<p>In fact the solution is very similar to this from corresponding post about changing title: How to change page title in angular2 router.</p>
<p>Angular Meta docs: https://angular.io/docs/ts/latest/api/platform-browser/index/Meta-class.html. In fact they aren't very informative and I had to experiment and look into real .js code to make this dynamic meta change working.</p>
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<p>There is currently no out-of-the-box solution only an open issue to implement it https://github.com/angular/angular/issues/7438.</p>
<p>You can of course implement something like the title service yourself, just use the TitleService as template </p>
<p>A <code>Meta</code> service similar to <code>Title</code> service is in the works (currently only a pull request).</p>
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<p>I have developed and just released @ngx-meta/core plugin, which manipulates the meta tags at the route level, and allows setting the meta tags programmatically within the component constructor.</p>
<p>You can find detailed instructions at @ngx-meta/core github repository. Also, source files might be helpful to introduce a custom logic.</p>
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