Skip to main content

Introducing polymer.dart

Dart engineer John Messerly announces the launch of polymer.dart, a port of the Polymer stack. The Web UI package will be maintained for some time, but will eventually be replaced by polymer.dart.

Here is John's original post introducing polymer.dart:

Hello Dartisans,

Since we started Web UI, we've had a goal to bring the latest web standards like Web Components and Model-Driven Views to Dart developers. There have been some great developments since we started:

  • Web Components has progressed into a set of detailed specs (Custom Elements, Shadow DOM, HTML Templates, HTML Imports) with interest and implementation by multiple browser vendors.
  • Model-Driven Views has new APIs (Node.bind, TemplateElement.model) that allow custom elements to participate in the binding system, as well as the ability to plug in custom syntax, such as the fancy_syntax package.
  • dart:mirrors is now implemented in dart2js!
  • Last but not least: the development of the Polymer project. Polymer is a new type of JavaScript library for the web that builds on top of these emerging standards.

Today we continue our mission by publishing the beginnings of polymer.dart, our port of the Polymer stack. We’re pushing several packages to Pub: observe, mdv, shadow_dom, and the polymer.dart package.  The Dart team is collaborating with the Polymer team to ensure that polymer.dart elements and polyfills are fully compatible with Polymer.

This is only the beginning. Polymer and web components are evolving, and we’re going to keep bringing that to you. Some of the things we’ll be working on are:
  • declarative <polymer-element> and custom elements.
  • more new, up-to-date polyfill packages, like html_imports.
  • removing the mandatory compiler step for polymer.dart. Just edit, save & refresh!
  • bring the Polymer UI elements to Dart.
  • up to date documentation for all of this shiny new stuff.

It's still very early for polymer.dart, but we welcome you to try out the new packages. We’ll be maintaining the web_ui package for a considerable time, but will eventually be sunsetting it in favor of Polymer. Thanks in advance for your feedback as we continue the port and evolve the specs and implementations. We hope you’re as excited as we are about Polymer, and can't wait to see what you build!

Thanks!

Popular posts from this blog

AngularDart 4

AngularDart v4 is now available. We've been busy since the release angular2 v3.1.0 in May. Not only did we "drop the 2", but we also improved the compiler and tightened up the framework to give you smaller code, we updated the package structure to improve usability, and we added several new features. Check out the updated documentation to get started.
Just angular Upgrading to v4 will require more than updating your version constraint. The package has changed names (back) to angular – dropping the 2. You'll need to update your pubspec.yaml and the corresponding imports in your code. In most instances, find-and-replace should do the trick. Going forward, the package will be called package:angular. We'll just update the version number.
Smaller code The updated compiler in 4.0 allows type-based optimizations that not only improve runtime performance but generate better code because we are able to strongly type templates. A big result of the update is that many ap…

Const, Static, Final, Oh my!

Posted by Seth Ladd

(This is an "oldie but a goodie" misc@dartlang.org post originally written by Bob Nystrom. It is being posted here as the explanations still ring true.)

Bob writes:


"static", "final", and "const" mean entirely distinct things in Dart:

"static" means a member is available on the class itself instead of on instances of the class. That's all it means, and it isn't used for anything else. static modifies *members*.

"final" means single-assignment: a final variable or field *must* have an initializer. Once assigned a value, a final variable's value cannot be changed. final modifies *variables*.

"const" has a meaning that's a bit more complex and subtle in Dart. const modifies *values*. You can use it when creating collections, like const [1, 2, 3], and when constructing objects (instead of new) like const Point(2, 3). Here, const means that the object's entire deep state can be determ…

The new AdWords UI uses Dart — we asked why

Google just announced a re-designed AdWords experience. In case you’re not familiar with AdWords: businesses use it to advertise on google.com and partner websites. Advertising makes up majority of Google’s revenue, so when Google decides to completely redo the customer-facing front end to it, it’s a big deal. The Dart team is proud to say that this new front end is built with Dart and Angular 2. Whenever you asked us whether Google is ‘even using Dart for anything,’ this is what we had in mind but couldn’t say aloud. Until now. We asked Joshy Joseph, the primary technical lead on the project, some questions. Joshy is focusing on things like infrastructure, application latency and development velocity, so he’s the right person to ask about Dart.Q: What exactly did we launch on Monday?It’s a complete redesign of the AdWords customer experience that is rolling out slowly as a test to a small initial set of advertisers. The most noticeable thing is probably the Material Design look and f…