polymer 0.16.4+4

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Polymer.dart is a new type of library for the web, built on top of Web Components, and designed to leverage the evolving web platform on modern browsers.

Polymer.dart #

Polymer.dart is a set of comprehensive UI and utility components for building web applications. With Polymer.dart's custom elements, templating, data binding, and other features, you can quickly build structured, encapsulated, client-side web apps.

Polymer.dart is a Dart port of Polymer created and maintained by the Dart team. The Dart team is collaborating with the Polymer team to ensure that polymer.dart elements and polyfills are fully compatible with Polymer.

Polymer.dart replaces Web UI, which has been deprecated.

Learn More #

  • The Polymer.dart homepage contains a list of features, project status, installation instructions, tips for upgrading from Web UI, and links to other documentation.

  • See our TodoMVC example by opening up the Dart Editor's Welcome Page and selecting "TodoMVC".

  • For more information about Dart, see https://www.dartlang.org/.

  • When you use this package, you automatically get the polymer_expressions package, which provides an expressive syntax for use with templates.

Try It Now #

Add the polymer.dart package to your pubspec.yaml file:

dependencies:
  polymer: ">=0.16.0 <0.17.0"

Instead of using any, we recommend using version ranges to avoid getting your project broken on each release. Using a version range lets you upgrade your package at your own pace. You can find the latest version number at https://pub.dartlang.org/packages/polymer.

Building and Deploying #

To build a deployable version of your app, add the polymer transformers to your pubspec.yaml file:

transformers:
- polymer

Then, run pub build. The polymer transformers assume all files under web are possible entry points, this can be adjusted with arguments in your pubspec.yaml file. For example, you can say only web/index.html is an entry point as follows:

transformers:
- polymer:
    entry_points: web/index.html

Here is a list of arguments used by the polymer transformers:

  • js: whether to load JS code directly. By default polymer converts your app's html file to load the compiled JS code directly. Setting this parameter to false will keep a dart script tag and the dart.js script tag on the page.

  • csp: whether to load a Content Security Policy (CSP) compliant JS file. Dart2js generates two JS files, one that is not CSP compilant and one that is. By default, polymer uses the former becuase it's likely more efficient, but you can choose the latter by setting this flag.

  • entry_points: can be a list of entry points or, for convenience, a single entry point as shown above.

For example, this specification includes 2 entrypoints and chooses the CSP compliant JS file:

transformers:
- polymer:
    entry_points:
    - web/index.html
    - web/index2.html
    csp: true

Testing #

Polymer elements can be tested using either the original unittest or new test packages. In both cases the easiest way to create a test is by using the default main from polymer/init.dart and then defining all your tests inside of a method marked with an @whenPolymerReady annotation.

import 'package:polymer/polymer.dart';
export 'package:polymer/init.dart';

@whenPolymerReady
void runTests() {
  // Define your tests here.
}

You will also need to define a custom html file for your test (see the README for the testing package you are using for more information on this).

Note: If you are using the new test package, it is important that you add the test transformer after the polymer transformer, so it should look roughly like this:

transformer:
- polymer:
    entry_points:
      - test/my_test.html
- test/pub_serve:
    $include: test/**_test{.*,}.dart

Contacting Us #

Please file issues in our Issue Tracker or contact us on the Dart Web mailing list.

We also have a Dart Slack Channel for discussions about internals of the code, code reviews, etc.

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Polymer.dart is a new type of library for the web, built on top of Web Components, and designed to leverage the evolving web platform on modern browsers.

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