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-# js_util |
- |
-[![Build Status](https://travis-ci.org/fluidic/js_util.svg?branch=master)](https://travis-ci.org/fluidic/js_util) |
- |
-Utilities to access JavaScript from Dart. |
- |
-* toJS(o): Converts a Dart object to a JavaScript object. |
-* newObject(): Creates a new JavaScript object. |
-* defineProperty(o, String prop, PropertyDescription desc): A wrapper for [Object.defineProperty][defineProperty] |
-* getValue(o, String prop): Returns `o[prop]`. |
-* setValue(o, String prop, value): Performs `o[prop] = value`. |
- |
-These utilities are of great help if a JavaScript API takes a JavaScript object |
-with keys that are not fixed because [js][js] package does not let you create a |
-JavaScript object without declaring a Dart class with `@JS()` and `@anonymous`. |
- |
-[defineProperty]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty |
-[js]: https://pub.dartlang.org/packages/js |
- |
-## Getting Started |
- |
-Include `js_util.js` in index.html to use js_util functions. |
- |
-```html |
-<html> |
- <head> |
- <script async src="packages/js_util/dist/js_util.js"></script> |
- <script async src="packages/browser/dart.js"></script> |
- </head> |
-</html> |
-``` |
- |
-## Usage |
- |
-A simple usage example: |
- |
-```dart |
-final obj = newObject(); |
-defineProperty(obj, 'foo', new PropertyDescription(enumerable: true, value: 1)); |
-defineProperty(obj, 'bar', new PropertyDescription(enumerable: false, value: 2)); |
-``` |
- |
-```dart |
-final obj = newObject(); |
-setValue(obj, 'foo', 1); |
-setValue(obj, 'bar', 2); |
- |
-print(getValue(obj, 'foo')); // 1 |
-print(getValue(obj, 'bar')); // 2 |
-``` |
- |
-```dart |
-final jsObj = toJS({ |
- 'people': [ |
- {'firstName': 'Kwang Yul', 'lastName': 'Seo'}, |
- {'firstName': 'DoHyung', 'lastName': 'Kim'}, |
- {'firstName': 'Kyusun', 'lastName': 'Kim'} |
- ] |
-}); |
- |
-final people = getValue(jsObj, 'people'); |
-print(getValue(people[0], 'firstName')); // 'Kwang Yul' |
-``` |
- |
-## Features and bugs |
- |
-Please file feature requests and bugs at the [issue tracker][tracker]. |
- |
-[tracker]: https://github.com/ProtoCatTeam/js_util/issues |