js 0.6.0

Methods and annotations to specify interoperability with JavaScript APIs.

This packages requires Dart SDK 1.13.0.

This is beta software. Please files [issues].

Adding the dependency

Add the following to your pubspec.yaml:

dependencies:
  js: ^0.6.0

Example

See the Chart.js Dart API for an end-to-end example.

Usage

Calling methods

// Calls invoke JavaScript `JSON.stringify(obj)`.
@JS("JSON.stringify")
external String stringify(obj);

Classes and Namespaces

@JS('google.maps')
library maps;

// Invokes the JavaScript getter `google.maps.map`.
external Map get map;

// `new Map` invokes JavaScript `new google.maps.Map(location)`
@JS()
class Map {
  external Map(Location location);
  external Location getLocation();
}

// `new Location(...)` invokes JavaScript `new google.maps.LatLng(...)`
//
// We recommend against using custom JavaScript names whenever
// possible. It is easier for users if the JavaScript names and Dart names
// are consistent.
@JS("LatLng")
class Location {
  external Location(num lat, num lng);
}

JavaScript object literals

Many JavaScript APIs take an object literal as an argument. For example:

// JavaScript
printOptions({responsive: true});

If you want to use printOptions from Dart, you cannot simply pass a Dart Map object – they are are "opaque" in JavaScript.

Instead, create a Dart class with both the @JS() and @anonymous annotations.

// Dart
void main() {
  printOptions(new Options(responsive: true));
}

@JS()
external printOptions(Options options);

@JS()
@anonymous
class Options {
  external bool get responsive;

  external factory Options({bool responsive});
}

Passing functions to JavaScript.

If you are passing a Dart function to a JavaScript API, you must wrap it using allowInterop or allowInteropCaptureThis.

Contributing and Filing Bugs

Please file bugs and features requests on the Github issue tracker.

We also love and accept community contributions, from API suggestions to pull requests. Please file an issue before beginning work so we can discuss the design and implementation. We are trying to create issues for all current and future work, so if something there intrigues you (or you need it!) join in on the discussion.

Code contributors must sign the Google Individual Contributor License Agreement.

0.6.0

  • Version 0.6.0 is a complete rewrite of package:js.

1. Depend on it

Add this to your package's pubspec.yaml file:

dependencies:
  js: "^0.6.0"

2. Install it

You can install packages from the command line:

$ pub get

Alternatively, your editor might support pub. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:js/js.dart';

About

Access JavaScript from Dart.

Author

Email misc@dartlang.org Dart Team

Homepage

github.com/dart-lang/sdk/tree/master/pkg/js

Documentation

www.dartdocs.org/documentation/js/0.6.0/

Uploader

vsm@google.com
jmesserly@google.com
sigmund@google.com
sethladd@google.com
kevmoo@google.com
jacobr@google.com

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