118 lines
3.7 KiB
Markdown
118 lines
3.7 KiB
Markdown
# The Application Shell
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## Install the Angular CLI
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Install the [Angular CLI](https://github.com/angular/angular-cli), if you haven't already done so.
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<code-example language="sh" class="code-shell">
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npm install -g @angular/cli
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</code-example>
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## Create a new application
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Create a new project named `angular-tour-of-heroes` with this CLI command.
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<code-example language="sh" class="code-shell">
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ng new angular-tour-of-heroes
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</code-example>
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The Angular CLI generated a new project with a default application and supporting files.
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## Serve the application
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Go to the project directory and launch the application.
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<code-example language="sh" class="code-shell">
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cd angular-tour-of-heroes
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ng serve --open
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</code-example>
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<div class="l-sub-section">
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The `ng serve` command builds the app, starts the development server,
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watches the source files, and rebuilds the app as you make changes to those files.
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The `--open` flag opens a browser to `http://localhost:4200/`.
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</div>
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You should see the app running in your browser.
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## Angular components
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The page you see is the _application shell_.
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The shell is controlled by an Angular **component** named `AppComponent`.
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_Components_ are the fundamental building blocks of Angular applications.
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They display data on the screen, listen for user input, and take action based on that input.
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## Change the application title
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Open the project in your favorite editor or IDE and navigate to the `src/app` folder.
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You'll find the implementation of the shell `AppComponent` distributed over three files:
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1. `app.component.ts`— the component class code, written in TypeScript.
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1. `app.component.html`— the component template, written in HTML.
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1. `app.component.css`— the component's private CSS styles.
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Open the component class file (`app.component.ts`) and change the value of the `title` property to 'Tour of Heroes'.
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<code-example path="toh-pt0/src/app/app.component.ts" region="set-title" title="app.component.ts (class title property)" linenums="false">
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</code-example>
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Open the component template file (`app.component.html`) and
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delete the default template generated by the Angular CLI.
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Replace it with the following line of HTML.
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<code-example path="toh-pt0/src/app/app.component.html"
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title="app.component.html (template)" linenums="false">
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</code-example>
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The double curly braces are Angular's *interpolation binding* syntax.
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This interpolation binding presents the component's `title` property value
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inside the HTML header tag.
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The browser refreshes and displays the new application title.
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{@a app-wide-styles}
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## Add application styles
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Most apps strive for a consistent look across the application.
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The CLI generated an empty `styles.css` for this purpose.
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Put your application-wide styles there.
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Here's an excerpt from the `styles.css` for the _Tour of Heroes_ sample app.
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<code-example path="toh-pt0/src/styles.1.css" title="src/styles.css (excerpt)">
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</code-example>
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## Final code review
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The source code for this tutorial and the complete _Tour of Heroes_ global styles
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are available in the <live-example></live-example>.
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Here are the code files discussed on this page.
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<code-tabs>
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<code-pane title="src/app/app.component.ts" path="toh-pt0/src/app/app.component.ts">
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</code-pane>
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<code-pane title="src/app/app.component.html" path="toh-pt0/src/app/app.component.html">
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</code-pane>
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<code-pane
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title="src/styles.css (excerpt)"
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path="toh-pt0/src/styles.1.css">
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</code-pane>
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</code-tabs>
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## Summary
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* You created the initial application structure using the Angular CLI.
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* You learned that Angular components display data.
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* You used the double curly braces of interpolation to display the app title.
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