Dart Chrome扩展程序：监听chrome api事件

问题描述：

为了更好地描述我的问题，我创建了一个用Dart编写的chrome扩展的小例子。
您可以在 Gist 上查看代码或下载扩展程序。

To better describe my problem i have created a small example of a chrome extension written in Dart. You can see the code or download the extension on Gist.

问题

此示例在Dartium中正常运行，但在编译为javascript时会发生类型错误：未捕获的TypeError：undefined不是以下行的函数：

This example is running fine in Dartium, but when compiled to javascript a typeerror occurs: Uncaught TypeError: undefined is not a function for the line:

context['chrome']['runtime']['onMessage'].callMethod('addListener', [onMessageListener]);

我已有多远

正如你在例子中看到的， alert（）或 console.log 通过 dart：js 也在js-extension中工作。

还会打印出 context ['chrome'] ['runtime' ] ['onMessage'] 显示正确的事件对象。（例如： context ['console']。callMethod（'log'，[context ['chrome'] ['runtime'] ['onMessage']]; ）

我知道有一个chrome pub包，但是在onMessage中响应接收到的消息时仍然有一个错误。另请参阅此问题。使用chrome api直接通过dart：js是在dart版本上很好的解决方法。

As you may see in the example the functions alert() or console.log() via dart:js are also working in the js-extension. So it could be a special problem with dart2js and adding eventlisteners?
Also printing out context['chrome']['runtime']['onMessage'] shows the right event-object. (E.g.: context['console'].callMethod('log', [context['chrome']['runtime']['onMessage']]);)
I know that there exist an chrome pub package, but there is still a bug when responding to received messages in onMessage. See also this question. Using the chrome api directly via dart:js was the workaround which was fine at that dart version.

我玩了很多代码，但所有的结果都有相同的错误。现在我的想法。希望社群可以再次帮助我。

I played a lot with the code but all results in the same error. Now i am out of ideas. Hope the community can help me again.

编辑：
我现在已在 dartbug.com 。

答

由于 keerti 已提及：解决方法的类似问题可以查找

As keerti already mentioned: A similar problem with a workaround can be find here.

我的解决方案如下：

  //Tmp: sendResponse is buged, so we use the js-version
  //chrome.runtime.onMessage.listen(onMessageDartListener);

  //..and ofcourse the js-version is buged too. So this workaround here:
  var jsOnMessageEvent = context['chrome']['runtime']['onMessage'];
  JsObject dartOnMessageEvent = (jsOnMessageEvent is JsObject ? jsOnMessageEvent : new JsObject.fromBrowserObject(jsOnMessageEvent));
  dartOnMessageEvent.callMethod('addListener', [onMessageListener]);

Dart Chrome扩展程序：监听chrome api事件

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