在dart中构建chrome扩展时，与chrome.runtime.onConnect有关的问题

问题描述

当我运行 dart2js 编译版本的chrome扩展时遇到以下问题：

 未捕获TypeError：undefined不是函数
  

$ b

  context ['chrome'] ['runtime'] ['onConnect']。 callMethod（'addListener'，[（port）{...}]）; 
  

我创建了一个可能指向原因的示例：

background.dart

  import'dart：js'; 
 
 void main（）{
 print（main（）：context ['chrome'] ['runtime'] ['onConnect']（$ {context ['chrome'] [ 'runtime'] ['onConnect']。runtimeType}）：$ {context ['chrome'] ['runtime'] ['onConnect']} 
} 
  

在Dartium中打印：

  main（）：context ['chrome'] ['runtime'] ['onConnect']（JsObject）：[object Object] 
  

但在Chrome中：

它与（）？

可能有人建议如何注册将在Dartium和Chrome中使用的 chrome.runtime.onConnect 侦听器。

解决方案

查看 chrome.dart 包中的 common.dart 包：

  void _ensureHandlerAdded（）{
 if（！_handlerAdded）{
 // TODO：不正确
 //代理在M35和之后。 
 var jsEvent = _api [_eventName]; 
 JsObject event =（jsEvent is JsObject？jsEvent：new JsObject.fromBrowserObject（jsEvent））; 
 event.callMethod（'addListener'，[_listener]）; 
 _handlerAdded = true; 
} 
} 
  

看起来有必要换行

$ 中的到 b
$ b

以下也需要同样的功能：

• port.onDisconnect


• port.onMessage

如果有人知道跟踪此问题的现有问题，请随时添加。 / p>

I have the following problem when running dart2js compiled version of my chrome extension:

Uncaught TypeError: undefined is not a function

when executing

  context['chrome']['runtime']['onConnect'].callMethod('addListener', [(port) { ... }]);

I have created an example which possibly points to the cause:

background.dart

import 'dart:js';

void main() {
  print("main(): context['chrome']['runtime']['onConnect'] (${context['chrome']['runtime']['onConnect'].runtimeType}): ${context['chrome']['runtime']['onConnect']}");
}

prints in Dartium:

main(): context['chrome']['runtime']['onConnect'] (JsObject): [object Object]

but in Chrome:

main(): context['chrome']['runtime']['onConnect'] (Event): Instance of 'Event'

Is it related to Difference between Dartium and dart2js when building chrome extensions (https://code.google.com/p/dart/issues/detail?id=17086)?

Could someone suggest how to register chrome.runtime.onConnect listener which would work in both Dartium and Chrome?

解决方案

After looking at common.dart in chrome.dart package:

void _ensureHandlerAdded() {
  if (!_handlerAdded) {
    // TODO: Workaround an issue where the event objects are not properly
    // proxied in M35 and after.
    var jsEvent = _api[_eventName];
    JsObject event = (jsEvent is JsObject ? jsEvent : new JsObject.fromBrowserObject(jsEvent));
    event.callMethod('addListener', [_listener]);
    _handlerAdded = true;
  }
}

it seems necessary to wrap Event into JsObject to make it working in dart:js.

The same was required for the following too:

• port.onDisconnect
• port.onMessage

If someone knows of an existing issue tracking this problem, please feel free to add it.

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