Question

对于我的chrome扩展，我想在browserAction弹出窗口关闭时执行操作。我知道发生这种情况时不会触发内置事件。我找到this suggestion来打开与后台脚本的连接，然后使用连接的port.onDisconnect事件来检测弹出窗口是否正在关闭。

但是，当弹出窗口关闭时，我在Developer Console中看到后台脚本出现以下错误：

(BLESSED_EXTENSION context for glkehflnlfekdijfhacccflbffbjhgbd) extensions::messaging:102: Uncaught TypeError: Cannot read property 'destroy_' of undefined{TypeError: Cannot read property 'destroy_' of undefined
   at PortImpl.destroy_ (extensions::messaging:102:37)
   at dispatchOnDisconnect (extensions::messaging:322:29)}

我使用的脚本详述如下。

你能看到我出错的地方吗？

的manifest.json

{ "manifest_version": 2

, "name": "Detect when popup closes"
, "version": "0.1"

, "browser_action": {
    "default_icon": "popup.png"
  , "default_popup": "popup.html"
  }

, "background": {
    "scripts": [
      "background.js"
    ]
  }
}

popup.html

<!DOCTYPE html>
<body>
  <h1>Test</h1>

  <script src="popup.js"></script>  
</body>
</html>

popup.js

var port = chrome.runtime.connect()

background.js

chrome.runtime.onConnect.addListener(function (externalPort) {
  externalPort.onDisconnect = function () {
    try { 
      var ignoreError = chrome.runtime.lastError
    } catch (error) {
      console.log("onDisconnect")
    }
  }
)

Answer 1

onDisconnect不是可转让的财产它是一个提供addListener方法来注册回调的对象：

externalPort.onDisconnect.addListener(function() {
    var ignoreError = chrome.runtime.lastError;
    console.log("onDisconnect");
});

Answer 2

作为参考，这里是background.js脚本的工作版本：

chrome.runtime.onConnect.addListener(function (externalPort) {
  externalPort.onDisconnect.addListener(function () {
    console.log("onDisconnect")
    // Do stuff that should happen when popup window closes here
  })

  console.log("onConnect")
})

Chrome扩展程序：检测弹出窗口何时关闭

2 个答案: