docs(cb-set-document-title): new "Set Title" cookbook chapter
closes #1069
This commit is contained in:
Ben Nadel
Ward Bell
parent
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// gulp run-e2e-tests --filter=cb-set-document-title
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describe('Set Document Title', function () {
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beforeAll(function () {
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browser.get('');
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});
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it('should set the document title', function () {
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var titles = [
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'Good morning!',
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'Good afternoon!',
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'Good evening!'
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];
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element.all( by.css( 'ul li a' ) ).each(
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function iterator( element, i ) {
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element.click();
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expect( browser.getTitle() ).toEqual( titles[ i ] );
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}
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);
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});
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});
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**/*.js
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npm-debug.log
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// #docplaster
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// #docregion
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// Import the native Angular services.
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import { Component } from 'angular2/core';
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import { Title } from 'angular2/platform/browser';
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@Component({
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selector: 'my-app',
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template:
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`<p>
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Select a title to set on the current HTML document:
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</p>
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<ul>
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<li><a (click)="setTitle( 'Good morning!' )">Good morning</a>.</li>
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<li><a (click)="setTitle( 'Good afternoon!' )">Good afternoon</a>.</li>
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<li><a (click)="setTitle( 'Good evening!' )">Good evening</a>.</li>
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</ul>
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`
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})
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// #docregion class
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export class AppComponent {
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public constructor(private _titleService: Title ) { }
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public setTitle( newTitle: string) {
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this._titleService.setTitle( newTitle );
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}
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}
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// #enddocregion class
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// #docregion
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import { bootstrap } from 'angular2/platform/browser';
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import { AppComponent } from './app.component';
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// While Angular supplies a Title service for setting the HTML document title
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// it doesn't include this service as part of the default Browser platform providers.
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// As such, if we want to inject it into the components within our application,
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// we have to explicitly provide the Angular service in our top component.
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// #docregion bootstrap-title
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import { Title } from 'angular2/platform/browser';
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bootstrap(AppComponent, [ Title ])
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// #enddocregion bootstrap-title
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.then(
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() => window.console.info( 'Angular finished bootstrapping your application!' ),
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(error) => {
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console.warn( 'Angular was not able to bootstrap your application.' );
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console.error( error );
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}
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);
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<base href="/">
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<title>
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Setting The Document Title Using The Title Service
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</title>
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<!-- #docregion style -->
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<link rel="stylesheet" type="text/css" href="styles.css">
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<link rel="stylesheet" type="text/css" href="sample.css">
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<!-- #enddocregion style -->
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<!-- IE required polyfills, in this exact order -->
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<script src="node_modules/es6-shim/es6-shim.min.js"></script>
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<script src="node_modules/systemjs/dist/system-polyfills.js"></script>
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<script src="node_modules/angular2/es6/dev/src/testing/shims_for_IE.js"></script>
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<script src="node_modules/angular2/bundles/angular2-polyfills.js"></script>
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<script src="node_modules/systemjs/dist/system.src.js"></script>
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<script src="node_modules/rxjs/bundles/Rx.js"></script>
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<script src="node_modules/angular2/bundles/angular2.dev.js"></script>
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<script>
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// Configure our module loader.
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System.config({
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packages: {
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app: {
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format: "register",
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defaultExtension: "js"
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}
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}
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});
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// Load the root module (which will, in turn, bootstrap the Angular 2 application).
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System
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.import( "app/main" )
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.then(
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function handleSuccess() {
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console.info( "System.js loaded your application module." );
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},
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function handleError( error ) {
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console.warn( "System.js could not load your application module." );
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console.error( error );
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}
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);
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</script>
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</head>
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<body>
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<h1>
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Setting The Document Title Using The Title Service
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</h1>
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<my-app>
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Loading app...
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</my-app>
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</body>
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</html>
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{
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"description": "Set The Document Title In Angular 2",
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"files": [
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"!**/*.d.ts",
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"!**/*.js",
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"!**/*.[1].*"
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],
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"tags": [ "cookbook" ]
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}
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a {
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color: #607D8B ;
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text-decoration: underline ;
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}
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"hide": true
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},
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"set-document-title": {
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"title": "Set the Document Title",
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"intro": "Setting the document or window title using the Title service."
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},
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"ts-to-js": {
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"title": "TypeScript to JavaScript",
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"intro": "Convert Angular 2 TypeScript examples into ES5 JavaScript",
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!= partial("../../../_includes/_ts-temp")
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"intro": "Render dynamic forms with NgFormModel"
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},
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"set-document-title": {
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"title": "Set the Document Title",
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"intro": "Setting the document or window title using the Title service."
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},
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"ts-to-js": {
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"title": "TypeScript to JavaScript",
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"intro": "Convert Angular 2 TypeScript examples into ES5 JavaScript"
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!= partial("../../../_includes/_ts-temp")
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"intro": "Render dynamic forms with NgFormModel"
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},
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"set-document-title": {
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"title": "Set the Document Title",
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"intro": "Setting the document or window title using the Title service."
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},
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"ts-to-js": {
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"title": "TypeScript to JavaScript",
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"intro": "Convert Angular 2 TypeScript examples into ES5 JavaScript"
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include ../_util-fns
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a(id='top')
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:marked
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Our app should be able to make the browser title bar say whatever we want it to say.
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This cookbook explains how to do it.
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:marked
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**See the [live example](/resources/live-examples/cb-set-document-title/ts/plnkr.html)**.
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.l-sub-section
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img(src='/resources/images/devguide/plunker-separate-window-button.png' alt="pop out the window" align="right" style="margin-right:-20px")
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:marked
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To see the browser Title bar changes,
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pop out the preview window by clicking the blue 'X' button in the upper right corner.
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:marked
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## The problem with *<title>*
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The obvious approach is to bind a property of the component to the HTML `<title>` like this:
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code-example(format='')
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<title>{{This_Does_Not_Work}}</title>
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:marked
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Sorry but that won't work.
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The root component of our application is an element contained within the `<body>` tag.
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The HTML `<title>` is in the document `<head>`, outside the body, making it inaccessible to Angular data binding.
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We could grab the browser `document` object and set the title manually.
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That's dirty and undermines our chances of running the app outside of a browser someday.
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.l-sub-section
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:marked
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That's a major Angular architectural goal. It may not seem important to us right now.
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But why squander that future just to set the title bar?
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:marked
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## Use the *Title* service
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Fortunately, Angular 2 bridges the gap by providing a `Title` service as part of the *Browser platform*.
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The [Title](../api//platform/browser/Title-class.html) service is a simple class that provides an API
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for getting and setting the current HTML document title:
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* `getTitle() : string` — Gets the title of the current HTML document.
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* `setTitle( newTitle : string )` — Sets the title of the current HTML document.
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While this class is part of the Browser platform package, it is *not part of the default Browser
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platform providers* that Angular loads automatically.
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This means as we bootstrap our application using the Browser platform `boostrap()`
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function, we'll also have to include `Title` service explicitly as one of the bootstrap providers:
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+makeExample( "cb-set-document-title/ts/app/main.ts", "bootstrap-title", "app/main.ts (provide Title service)" )(format='.')
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:marked
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Once we've explicitly provided the `Title` service we can then inject the `Title` service into any of our
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custom application components and services.
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Let's inject the `Title` service into the root `AppComponent` and expose a bindable `setTitle` method that calls it:
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+makeExample( "cb-set-document-title/ts/app/app.component.ts", "class", "app/app.component.ts (class)" )(format='.')
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:marked
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We bind that method to three anchor tags and, voilà!
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figure.image-display
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img(src="/resources/images/cookbooks/set-document-title/set-title-anim.gif" alt="Set title")
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:marked
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Here's the complete solution
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+makeTabs(
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`cb-set-document-title/ts/app/main.ts,
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cb-set-document-title/ts/app/app.component.ts`,
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'',
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'app/main.ts, app/app.component.ts' )
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//
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Todo: tie this back to the router so we can see how to use this Title service to (re)set the title
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that appears in the window navigation history and shows up in the back/forward buttons
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during routing.
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See https://github.com/angular/angular/issues/7630#issuecomment-198328802
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.l-main-section
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:marked
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## Why we provide the *Title* service in *bootstrap*
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We generally recommended providing application-wide services in the root application component, `AppComponent`.
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Here we recommend registering the title service during bootstrapping,
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a location we reserve for configuring the runtime Angular enviroment.
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That's exactly what we're doing.
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The `Title` service is part of the Angular *browser platform*.
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If we bootstrap our application into a different platform,
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we'll have to provide a different `Title` service that understands the concept of a "document title" for that specific platform.
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Ideally the application itself neither knows nor cares about the runtime environment.
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:marked
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[Back to top](#top)
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