Chrome extension: detect when popup window closes

问题

For my chrome extension, I want to perform an action when the browserAction popup window closes. I understand that there no built-in events are triggered when this happens. I found this suggestion to open a connection with the background script, and then use the connection's port.onDisconnect event to detect that the popup window is closing.

However, when the popup window closes, I see the following error in the Developer Console for the background script:

(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)}

The scripts that I use are detailed below.

Can you see where I am going wrong?

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")
    }
  }
)

回答1:

onDisconnect is not an assignable property.
It's an object that provides addListener method to register a callback:

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

回答2:

For reference, here's the working version of the background.js script:

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")
})

来源：https://stackoverflow.com/questions/39730493/chrome-extension-detect-when-popup-window-closes

标签

google-chrome-extension

popup