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I am trying to pass a message between my popup to a background page using the one message interface (I'm using code similar to the one in Google's example for this).
popup:
chrome.extension.sendMessage( {msg: "this is popup's msg"}, function(b){
alert('this is popups callback func' +b.backgroundMsg);
});
and this is how I listen (and reply) in background.js:
chrome.extension.onMessage.addListener(function(msg, sender, sendResponse) {
sendResponse({backgroundMsg: "this is background msg"});
});
Now when I inspect everything in the console the messages are exchanged ok but I get the following error:
Error in event handler for 'undefined': Cannot call method 'disconnect' of null TypeError: Cannot call method 'disconnect' of null
at chromeHidden.Port.sendMessageImpl (miscellaneous_bindings:285:14)
at chrome.Event.dispatch (event_bindings:237:41)
at Object.chromeHidden.Port.dispatchOnMessage (miscellaneous_bindings:250:22)
Any thoughts?
408
Copying your code example and filling in the blanks with the manifest and popup structure resulted in a fully working extension without errors. Not sure why you are getting the error that you shared. Try my code and see if you can get rid of the error.
{
"name": "Stackoverflow Message Passing Example",
"manifest_version": 2,
"version": "0.1",
"description": "Simple popup with message passing for Stackoverflow question",
"browser_action": {
"default_popup": "popup.html"
},
"background": {
"scripts": ["background.js"]
}
}
chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse) {
sendResponse({backgroundMsg: "this is background msg"});
});
<html>
<head>
<script src="popup.js"></script>
<style type="text/css" media="screen">
body { width: 100px; height: 100px; }
</style>
</head>
<body>
<p>Check the console</p>
</body>
</html>
chrome.runtime.sendMessage( {msg: "this is popup's msg"}, function(b){
console.log('this is popups callback func ' + b.backgroundMsg);
});
Clicking extension button with browser window opened to exampley.com
Console log of extension popup
Here is a zip of the files I used http://mikegrace.s3.amazonaws.com/stackoverflow/simple-popup.zip
64
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