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How to read properties from opaque dynamic javascript map
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| <!DOCTYPE html> | |
| <!-- | |
| Copyright (c) 2016, <your name>. All rights reserved. Use of this source code | |
| is governed by a BSD-style license that can be found in the LICENSE file. | |
| --> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta name="scaffolded-by" content="https://github.com/google/stagehand"> | |
| <title>test_interop</title> | |
| <link rel="stylesheet" href="styles.css"> | |
| <script type="text/javascript"> | |
| function mapFromJs() { | |
| return {message: 'HELLO FROM JS', level: 'INFO'}; | |
| } | |
| </script> | |
| <script defer src="main.dart" type="application/dart"></script> | |
| <script defer src="packages/browser/dart.js"></script> | |
| </head> | |
| <body> | |
| <div id="output"></div> | |
| </body> | |
| </html> |
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| // Copyright (c) 2016, <your name>. All rights reserved. Use of this source code | |
| // is governed by a BSD-style license that can be found in the LICENSE file. | |
| import 'dart:html'; | |
| import "package:js/js.dart"; | |
| void main() { | |
| var v = mapFromJs(); | |
| var message = getValue(v,'message'); | |
| print('message $message'); | |
| querySelector('#output').text = message.toString(); | |
| } | |
| @JS() | |
| external mapFromJs(); | |
| @JS() | |
| @anonymous | |
| class Description { | |
| external get value; | |
| external factory Description({bool configurable, bool enumerable, value}); | |
| } | |
| @JS('Object.defineProperty') | |
| external void defineProperty(o, String prop, Description description); | |
| setValue(o, String key, value) => | |
| defineProperty(o, key, new Description(value: value)); | |
| @JS('Object.getOwnPropertyDescriptor') | |
| external Description getOwnPropertyDescriptor(o, String prop); | |
| getValue(o, String key)=> getOwnPropertyDescriptor(o,key)?.value; | |
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