| Index: packages/js_util/README.md
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| -# js_util
|
| -
|
| -[](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]
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| -* getValue(o, String prop): Returns `o[prop]`.
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| -* setValue(o, String prop, value): Performs `o[prop] = value`.
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| -
|
| -These utilities are of great help if a JavaScript API takes a JavaScript object
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| -with keys that are not fixed because [js][js] package does not let you create a
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| -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
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| -[js]: https://pub.dartlang.org/packages/js
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| -
|
| -## Getting Started
|
| -
|
| -Include `js_util.js` in index.html to use js_util functions.
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| -
|
| -```html
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| -<html>
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| - <head>
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| - <script async src="packages/js_util/dist/js_util.js"></script>
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| - <script async src="packages/browser/dart.js"></script>
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| - </head>
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| -</html>
|
| -```
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| -
|
| -## Usage
|
| -
|
| -A simple usage example:
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| -
|
| -```dart
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| -final obj = newObject();
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| -defineProperty(obj, 'foo', new PropertyDescription(enumerable: true, value: 1));
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| -defineProperty(obj, 'bar', new PropertyDescription(enumerable: false, value: 2));
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| -```
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| -
|
| -```dart
|
| -final obj = newObject();
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| -setValue(obj, 'foo', 1);
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| -setValue(obj, 'bar', 2);
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| -
|
| -print(getValue(obj, 'foo')); // 1
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| -print(getValue(obj, 'bar')); // 2
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| -```
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| -
|
| -```dart
|
| -final jsObj = toJS({
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| - 'people': [
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| - {'firstName': 'Kwang Yul', 'lastName': 'Seo'},
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| - {'firstName': 'DoHyung', 'lastName': 'Kim'},
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| - {'firstName': 'Kyusun', 'lastName': 'Kim'}
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| - ]
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| -});
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| -
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| -final people = getValue(jsObj, 'people');
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| -print(getValue(people[0], 'firstName')); // 'Kwang Yul'
|
| -```
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| -
|
| -## Features and bugs
|
| -
|
| -Please file feature requests and bugs at the [issue tracker][tracker].
|
| -
|
| -[tracker]: https://github.com/ProtoCatTeam/js_util/issues
|
|
|
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Issue 2312183003:
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