This Polymer Starter Kit tutorial teaches you how to:

• Create a new menu item in the navigation menu.
• Create content for a new page.
• Route traffic to your new page.

This tutorial assumes you have already completed the Set up tutorial.

Serve the app locally

1. cd to the base directory of your project.

2. Start the local development server.

   gulp serve
   

The local development server opens the application in your default web browser. As you modify your application, the server detects the modifications, re-builds the application, and reloads your browser automatically. There is no need to re-load the browser or the application.

Create a navigation menu item

1. Open app/index.html in a text editor.

2. Find the navigation menu.

...
<!-- Drawer Content -->
<paper-menu attr-for-selected="data-route" selected="[[route]]">
  <a data-route="home" href="{{baseUrl}}">
    <iron-icon icon="home"></iron-icon>
    <span>Home</span>
  </a>
...

Each navigation menu item consists of an anchor element (<a>) with two children: <iron-icon> and <span>.

• <iron-icon> displays a single icon.
• <span> displays the text next to the icon.

1. Add the following new navigation item to the bottom of the menu.

<a data-route="books" href="{{baseUrl}}books">
  <iron-icon icon="book"></iron-icon>
  <span>Books</span>
</a>

Your menu should now look like the following:

...
<!-- Drawer Content -->
<paper-menu attr-for-selected="data-route" selected="[[route]]">
  <a data-route="home" href="{{baseUrl}}">
    <iron-icon icon="home"></iron-icon>
    <span>Home</span>
  </a>
  ...
  <a data-route="contact" href="{{baseUrl}}contact">
    <iron-icon icon="mail"></iron-icon>
    <span>Contact</span>
  </a>
  <a data-route="books" href="{{baseUrl}}books">
    <iron-icon icon="book"></iron-icon>
    <span>Books</span>
  </a>
</paper-menu>
...

If you view the app now, you should see your new item in the navigation menu, but the link does not point to a valid page yet.

Add content

In the previous section you added a navigation menu item to enable the user to navigate to a new page. Now, you add the content for that new page.

1. Open app/index.html in a text editor and find the main content.

<div class="content">
  <iron-pages attr-for-selected="data-route" selected="{{route}}">

    <section data-route="home">
      <paper-material elevation="1">
        <my-greeting></my-greeting>

        <p class="subhead">You now have:</p>
        <my-list></my-list>
        ...
      </paper-material>
    </section>

    <section data-route="users">
      <paper-material elevation="1">
        <h2 class="page-title">Users</h2>
        <p>This is the users section</p>
        <a href$="{{baseUrl}}users/Addy">Addy</a><br>
        <a href$="{{baseUrl}}users/Rob">Rob</a><br>
        <a href$="{{baseUrl}}users/Chuck">Chuck</a><br>
        <a href$="{{baseUrl}}users/Sam">Sam</a>
      </paper-material>
    </section>
    ...

• The PSK’s design pattern for structuring pages is to make each page a <section> element. The <iron-pages> element controls which page is displayed at any given time.
• The data-route attribute is an identifier for the routing system. You’ll set that up for your new page in the next section.
• The <paper-material> element creates a card which floats on top of the main content area. If you want to follow the Material Design specification, all main content should be displayed on top of one of these cards.
• The elevation attribute determines how high a <paper-material> element appears to visually float above the main content area. Experiment by setting it to values between 0 and 5.

1. Add the following content to the bottom of the main section area.

<section data-route="books">
  <paper-material elevation="1">
    <p>Hello, World!</p>
  </paper-material>
</section>

Your code should now look like the following:

...
<!-- Main Content -->
<div class="content">
  <iron-pages attr-for-selected="data-route" selected="">
    ...
    <section data-route="contact">
      <paper-material elevation="1">
        <h2 class="page-title">Contact</h2>
        <p>This is the contact section</p>
      </paper-material>
    </section>

    <section data-route="books">
      <paper-material elevation="1">
        <p>Hello, World!</p>
      </paper-material>
    </section>

  </iron-pages>
</div>
...

You now have content to link your new navigation item to. In the next section you’ll link your navigation item to your new content.

Route traffic to the new content

In this last tutorial, you make a minor modification to the routing system so that when a user clicks on the new “Books” navigation menu item, they get routed properly to your new page.

1. Open app/elements/routing.html in a text editor and add the following code near the bottom of the script, just below the page rule for /contact.

page('/books', function () {
  app.route = 'books';
});

Your script should now look like the following:

...

page('/', function () {
  app.route = 'home';
});

...

page('/contact', function () {
  app.route = 'contact';
});

page('/books', function () {
  app.route = 'books';
});

...

Your new page is now ready! Open your web browser and view it at http://localhost:5000/#!/books.