Polymer

Polymer lets you build encapsulated, re-usable elements that work just like HTML elements, to use in building web applications.

<!-- Polyfill Web Components for older browsers -->
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>

<!-- Import element -->
<link rel="import" href="google-map.html">

<!-- Use element -->
<google-map latitude="37.790" longitude="-122.390"></google-map>

Getting Started

Check out polymer-project.org for all of the library documentation, including getting started guides, tutorials, developer reference, and more.

Or if you'd just like to download the library, check out our releases page.

Polymer in 1 Minute

The Polymer library is a lightweight sugaring layer on top of the web components API's to help in building your own web components. It adds convenient features to make it easy to build complex elements:

Create and register a custom element

/**
 * A not-very-useful inline element
 */
Polymer({
    is: 'my-element'
});

<!-- use the element -->
<my-element></my-element>

Add markup to your element

<!-- define the markup that your element will use -->
<dom-module id="my-simple-namecard">
  <template>
    <div>
      Hi! My name is <span>Jane</span>
    </div>
  </template>

  <script>
    Polymer({
        is: 'my-simple-namecard'
    });
  </script>
</dom-module>

Configure properties on your element...

// Create an element that takes a property
Polymer({
    is: 'my-property-namecard',
    properties: {
      myName: {
        type: String
      }
    },
    ready: function() {
      this.textContent = 'Hi! My name is ' + this.myName;
    }
});

...and have them set using declarative attributes

<!-- using the element -->
<my-property-namecard my-name="Jim"></my-property-namecard>

Hi! My name is Jim.

Bind data into your element using the familiar mustache-syntax

<!-- define markup with bindings -->
<dom-module id="my-bound-namecard">
  <template>
    <div>
      Hi! My name is <span>{{myName}}</span>
    </div>
  </template>

  <script>
    Polymer({
      is: 'my-bound-namecard',
      properties: {
        myName: {
          type: String
        }
      }
    });
  </script>
</dom-module>

<!-- using the element -->
<my-bound-namecard my-name="Josh"></my-bound-namecard>

Hi! My name is Josh.

Style the internals of your element, without the style leaking out

<!-- add style to your element -->
<dom-module id="my-styled-namecard">
  <template>
    <style>
      /* This would be crazy in non webcomponents. */
      span {
        font-weight: bold;
      }
    </style>

    <div>
      Hi! My name is <span>{{myName}}</span>
    </div>
  </template>

  <script>
    Polymer({
      is: 'my-styled-namecard',
      properties: {
        myName: {
          type: String
        }
      }
    });
  </script>
</dom-module>

<!-- using the element -->
<my-styled-namecard my-name="Jesse"></my-styled-namecard>

Hi! My name is Jesse

and so much more!

Web components are an incredibly powerful new set of primitives baked into the web platform, and open up a whole new world of possibility when it comes to componentizing front-end code and easily creating powerful, immersive, app-like experiences on the web.

By being based on Web Components, elements built with Polymer are:

• Built from the platform up
• Self-contained
• Don't require an overarching framework - are interoperable across frameworks
• Re-usable

Contributing

The Polymer team loves contributions from the community! Take a look at our contributing guide for more information on how to contribute.

Communicating with the Polymer team

Beyond Github, we try to have a variety of different lines of communication available:

• Blog
• Twitter
• Google+ community
• Mailing list
• Slack channel

License

The Polymer library uses a BSD-like license available here