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Changes to chapter 1 of the Dart guide

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Kathy Walrath 2015-04-22 11:16:38 -07:00
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.l-main-section
h2#section-install Install Angular
p There are four steps to create any Angular app:
ol
li Create an entry point HTML file where users will start
li Load the Angular library at the top of the file
li Make a root component for your application
li Bootstrap Angular
p.
Dart makes dependencies available to the application through the <code>pubspec.yaml</code> file.
To use Angular2 in your app, include angular as a dependency. Here’s the minimal
<code>pubspec.yaml</code> file for this sample:
As long as you already
<a href="https://www.dartlang.org/downloads/">have the Dart SDK</a>,
getting started with Angular 2 is simple:
pre.prettyprint.lang-dart
ol
li Depend on the <b>angular2</b> pub package.
li Create a Dart file that defines (directly or indirectly) a
<b>root component</b> and <b>bootstraps</b> Angular.
li Create an HTML file that uses the root component and points to the Dart file
p.
You can use whichever editor or IDE you like,
or just use the command-line tools that the Dart SDK provides.
See <a href="http://www.dartlang.org/tools/">Dart Tools</a>
for more information.
h2#section-install Depend on angular2
p.
To use Angular2 in your app, include angular2 as a dependency in
your app's <b>pubspec.yaml</b> file. For example:
pre.prettyprint.lang-yaml
code.
# pubspec.yaml
name: getting_started
description: Dart version of Angular 2 example, Getting Started
version: 0.0.1
dependencies:
angular2: 2.0.0-alpha.20
browser: any
p.
The Dart Editor automatically downloads the packages your app depends on, along with any packages that they, in
turn, depend on. If this download fails or you like using the command line, you can explicitly install packages.
From Dart Editor, you can use <strong>Tools &gt; Pub Get</strong>. From the command line (in the root directory of
your app, assuming the Dart SDK is in your path), you can run <code>pub get</code>.
.l-main-section
h2#section-create-an-entry-point Create an entry point
p.
In the <code>web/</code> directory for your app, create an <code>index.html</code> file and add the Angular library
tags and a <code>main.dart</code> file where you'll build your first component.
p.
In the <code>&lt;body&gt;</code>, add an element called <code>&lt;my-app&gt;</code> that will be the root of your
application.
pre.prettyprint.lang-html
code.
//index.html
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;link rel=&quot;stylesheet&quot; href=&quot;style.css&quot;&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;my-app&gt;&lt;/my-app&gt;
&lt;script type=&quot;application/dart&quot; src=&quot;main.dart&quot;&gt;&lt;/script&gt;
&lt;script src=&quot;packages/browser/dart.js&quot;&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt
Run <b>pub get</b> to download the packages your app depends on.
(<a href="https://www.dartlang.org/tools/">Dart-savvy editors and IDEs</a>
typically run <code>pub get</code> for you.)
.l-main-section
h2#section-set-up-the-starting-component Set up the starting component
h2#section-set-up-the-starting-component Write the Dart code
p.
In <code>main.dart</code>, create a class called <code>AppComponent</code>, configure it to bind to the
<code>&lt;my-app&gt;</code> element in <code>index.html</code>, and call Angular's <code>bootstrap()</code> to kick
it all off like this:
Next to your <code>pubspec.yaml</code> file,
create a <code>web</code> subdirectory containing a Dart file
(<code>main.dart</code>).
Edit <code>main.dart</code>, adding a component class (<b>AppComponent</b>),
configuring it to bind to the <code>&lt;my-app&gt;</code> element,
and creating a top-level <code>main()</code> function that calls
Angular's <code>bootstrap()</code> function.
pre.prettyprint.lang-dart
code.
//main.dart
// web/main.dart
import 'package:angular2/angular2.dart';
import 'package:angular2/src/reflection/reflection.dart' show reflector;
import 'package:angular2/src/reflection/reflection_capabilities.dart' show ReflectionCapabilities;
@ -83,13 +73,59 @@
}
.l-main-section
h2#section-run-it Run it!
h2#section-create-an-entry-point Create an HTML file
p.
In the <code>web/</code> directoryapp, create an HTML file (<code>index.html</code>).
Edit <code>index.html</code> to add a <code>&lt;my-app&gt;</code> element
and call <code>main.dart</code>.
pre.prettyprint.lang-html
code.
&lt;!-- web/index.html -->
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;link rel=&quot;stylesheet&quot; href=&quot;style.css&quot;&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;my-app&gt;&lt;/my-app&gt;
&lt;script type=&quot;application/dart&quot; src=&quot;main.dart&quot;&gt;&lt;/script&gt;
&lt;script src=&quot;packages/browser/dart.js&quot;&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt
.l-main-section
h2#section-run-it Run the app!
p.
Now run the app. In Dart Editor’s Files view, select <code>index.html</code>, right-click, and choose <strong>Run
in Dartium</strong>.
Now run the app. How you do this depends on your tools.
ul
li.
If you're using <b>Dart Editor</b>,
right-click <b>web/index.html</b>,
and choose <b>Open in Dartium</b>.
This starts a web server
and opens your app in Dartium,
an experimental version of the Chromium browser that contains the Dart VM.
li.
If you're using <b>WebStorm</b> or <b>IntelliJ IDEA</b>,
right-click <b>web/index.html</b>,
and choose <b>Run 'index.html'</b>.
li.
If you're using the command line and don't have Dartium,
serve the app using <code>pub serve</code>,
and then run it by visiting <b>http://localhost:8080</b> in a browser.
Generating the JavaScript takes a few seconds when you first visit the page,
and the generated JavaScript is currently large.
The generated JavaScript will be smaller once
Angular's transformer becomes available.
p.
You should see something like this:
You should see:
div(align='center')
img(src='setup-example1.png')
@ -98,21 +134,48 @@
p This basic Angular app contains the structure for any app you'll build.
p.
You can think of Angular apps as a tree of components. This root component we've been talking about acts as the top
level container for the rest of your application. You've named this one <code>AppComponent</code>, but there's
nothing special about the name and you can use whatever makes sense to you.
.l-sub-section
h3 It's all a tree
p.
You can think of an Angular app as a tree of components.
The root component acts as the top-level container for the rest of your application.
You've named this one <code>AppComponent</code>, but there's
nothing special about the name; you can use whatever makes sense to you.
p.
The root component's job is to give a location in the HTML file where
your application can
render through its element—in this case, <code>&lt;my-app&gt;</code>.
There's nothing special about the HTML filename or the element name;
you can pick whatever you like.
p.
The root component loads the initial template for the application,
which loads other components to perform
whatever functions your application needs—menu bars, views, forms, and so on.
We'll walk through examples of all of
these in the following pages.
.l-sub-section
h3 @Component and @View annotations
p.
A component annotation describes details about the component.
An annotation can be identified by its at-sign (<code>@</code>).
p.
The <code>@Component</code> annotation defines the HTML tag for
the component by specifying the component's CSS selector.
p.
The <code>@View</code> annotation defines the HTML that
represents the component.
The component you wrote uses an inline template,
but you can also have an external template.
To use an external template,
specify a <code>templateUrl</code> property and
give it the path to the HTML file.
p.
The root component's job is to give a location in the <code>index.html</code> file where your application will
render through it's element, in this case <code>&lt;my-app&gt;</code>. There is also nothing special about this
element name and you can pick it as you like.
p.
The root component loads the initial template for the application that will load other components to perform
whatever functions your application needs - menu bars, views, forms, etc. We'll walk through examples of all of
these in the following pages.
p Exciting! Not excited yet? Let's move on to <a href="displaying-data.html">Displaying Data</a>.
Exciting! Not excited yet?
Let's move on to <a href="displaying-data.html">Displaying Data</a>.