Dart chrome扩展：如何在onMessage发送响应？

本文介绍了Dart chrome扩展：如何在onMessage发送响应？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 目前我正在使用Google的Dart开发Chrome扩充功能。 使用的Chrome软件包： API参考〜 OnMessageEvent参考 在后台脚本中我调用： / p> import'package：chrome / chrome_ext.dart'as chrome; void main（）{ // ... // Binde事件监听器 chrome.runtime.onMessage.listen（onMessage） ; // ... } / ** *消息事件处理 * / bool onMessage（chrome.OnMessageEvent messageEvent ）{ JsObject message = messageEvent.message; JsFunction response = messageEvent.sendResponse; switch（message ['action']）{ // ... //由弹出式窗口使用 case' refresh'： print（'Refresh called！'）; chrome.storage.sync.get（）。then（（_）{ new JsObject（response，[new JsObject.jsify（{'done'：true}）]）; }）; //请求异步发送响应（所以在OnMessageEvent参考中说） return true; // ... } return false; } 我的弹出式脚本如下所示： chrome.runtime.sendMessage（{'action'：refresh）; }）。然后（（_）{ print（'receive response！'）; }）; // ... 工作：消息refresh从弹出脚本发送到后台脚本工程！ 后台脚本打印刷新调用！ 无效：弹出窗口脚本从不会收到从后台脚本调用的响应： new JsObject（response，[new JsObject.jsify（{'done'：true}）] / code>。 我不知道如何处理sendResponse以真正发送响应。也许我的JsObject调用是错误的？希望别人能帮忙。 （Btw。也是非异步响应在这里不起作用） 上 github.com/dart-gde/chrome.dart 。您的问题可能是您尝试将回复传回的方式：解决方案 b new JsObject（response，[new JsObject.jsify（{'done'：true}）]）; 根据 dart.js docs，函数应该在以下情况下调用： response.apply（[new JsObject.jsify（{'done'：true}）]）; 更新：这里的工作代码： background.dart import dart： js'; void main（）{ print（main（）...）; context ['chrome'] ['runtime'] ['onMessage']。callMethod（'addListener'，[onMessageListener]）; } void onMessageListener（request，sender，sendResponse）{ print（received action = $ {request ['action']}）; sendResponse.apply（[new JsObject.jsify（{'done'：true}）]）; } popup.dart import'dart：js'; void main（）{ print（main（）：...）; context ['chrome'] ['runtime']。callMethod（'sendMessage'，[new JsObject.jsify（{'action'：'refresh'}），（response）=> print {response ['done']}）]）; } 更新：使它在JavaScript中工作 如注释中所述，从 context ['chrome'] ['runtime '] ['onMessage'] ...如果不是 JsObject ，应该使用 new JsObject.fromBrowserObject（） var jsObject = context ['chrome '] ['runtime'] ['onMessage']; （jsObject is JsObject？jsObject：new JsObject.fromBrowserObject（jsObject）） .callMethod（'addListener'，[onMessageListener]）; 希望它有帮助; - ） right now I'm developing a Chrome extension with Google's Dart.All works fine, except the onMessage-handling.Chrome-Package used: API Ref. ~ OnMessageEvent Ref.In the background-script i'm calling:import 'package:chrome/chrome_ext.dart' as chrome;void main() { //... //Binde event-listeners chrome.runtime.onMessage.listen(onMessage); //...}/** * Message event handling */bool onMessage(chrome.OnMessageEvent messageEvent){ JsObject message = messageEvent.message; JsFunction response = messageEvent.sendResponse; switch(message['action']){ //... //Used by popup case 'refresh': print('Refresh called!'); chrome.storage.sync.get().then((_){ new JsObject(response, [new JsObject.jsify({'done': true})]); }); //Idicate to send a response asynchronously (So it's said in the OnMessageEvent Ref.) return true; //... } return false;}My popup-scripts looks like this://...chrome.runtime.sendMessage({ 'action': "refresh"}).then((_){ print('receiving response!');});//...What is working:The message 'refresh' send from popup-script to background-script works!The background-script prints Refresh called!What is not working: The popup-script never receives the response called from the background-script: new JsObject(response, [new JsObject.jsify({'done': true})]);. I don't know how to handel sendResponse to really send an response. Maybe my call with JsObject is wrong? Hope someone else can help.(Btw. also a non async-response doesn't work here)This problem is also open on github.com/dart-gde/chrome.dart. 解决方案 Your problem might be in a way how you try to send the response back:new JsObject(response, [new JsObject.jsify({'done': true})]);According to the dart.js docs, the function should in your case be invoked like:response.apply([new JsObject.jsify({'done': true})]);Update: here the working code:background.dartimport 'dart:js';void main() { print("main()..."); context['chrome']['runtime']['onMessage'].callMethod('addListener', [onMessageListener]);}void onMessageListener(request, sender, sendResponse) { print("received action = ${request['action']}"); sendResponse.apply([new JsObject.jsify({'done': true})]);}popup.dartimport 'dart:js';void main() { print("main():..."); context['chrome']['runtime'].callMethod('sendMessage', [new JsObject.jsify({'action': 'refresh'}), (response) => print("received ${response['done']}")]);}Update: required patch to make it working in JavaScript tooAs mentioned in comments, there is a problem with the returned object from context['chrome']['runtime']['onMessage'] ... If it is not JsObject it should be wrapped into it by using new JsObject.fromBrowserObject()var jsObject = context['chrome']['runtime']['onMessage'];(jsObject is JsObject ? jsObject : new JsObject.fromBrowserObject(jsObject)).callMethod('addListener', [onMessageListener]);Hope it helps ;-) 这篇关于Dart chrome扩展：如何在onMessage发送响应？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！