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CGS  
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 More options Jul 27 2012, 6:21 pm
From: CGS <cgsmcml...@gmail.com>
Date: Sat, 28 Jul 2012 00:21:24 +0200
Local: Fri, Jul 27 2012 6:21 pm
Subject: Re: content script question
Print | View thread | Show original | Find messages by this author

Hi again,

I was trying to see where I went wrong with my messaging part, so, I
created a simple test extension:

manifest.js
========
{
    "name": "Content Script",
    ... // all the necessary things here
    "background": {
        "page": "background.html"
    },
    "content_scripts": [
        {
            "matches": ["http://127.0.0.1/*"],
            "js": ["page_contentscript.js"]
        }
    ],
    "permissions": [
        "background","tabs","<all_urls>"
    ]

}

background.html
============
<!doctype html>
<html>
<body>
<script src="extension_contentscript.js" type="text/javascript"></script>
</body>
</html>

page_contentscript.js
================
chrome.extension.sendMessage({greeting: "hello"}, function(response) {
  console.log(response.farewell);

});

extension_contentscript.js
===================
chrome.extension.onMessage.addListener(
  function(request, sender, sendResponse) {
    console.log(sender.tab ?
                "from a content script:" + sender.tab.url :
                "from the extension");
    if (request.greeting == "hello")
      sendResponse({farewell: "goodbye"});
  });

I loaded the extension and I checked the console:

Uncaught TypeError: Cannot call method 'addListener' of undefined

exactly at the line: chrome.extension.onMessage.addListener

More than that. I started index.html on 127.0.0.1 and I got:

Uncaught TypeError: Object #<Object> has no method 'sendMessage'

at the line: chrome.extension.sendMessage

As you can see, it's nothing else but copy-paste from
http://code.google.com/chrome/extensions/messaging.html (chapter "Simple
one-time requests") and it seems the "extension" object from within
"chrome" object is not recognized at all. Either I missed something in the
documentation, or the example from there doesn't work. In either case I am
pretty much frustrated, so, any help in understanding how that works is
much appreciated.

I am using Chromium 18.0.1025.168 (Developer Build 134367 Linux) Ubuntu
12.04.

Regards,
CGS

On Fri, Jul 27, 2012 at 4:30 PM, CGS <cgsmcml...@gmail.com> wrote:
> Hi everyone,

> I am trying to do some messages parsing in between the extension popup and
> a webpage designed to interact with the popup. Reading the documentation, I
> found that the recommended way is via content script (
> http://code.google.com/chrome/extensions/content_scripts.html), but I got
> this from the popup:

> Uncaught TypeError: Cannot call method 'addListener' of undefined

> The manifest permissions:

>     "permissions": [
>         "background","tabs","<all_urls>"
>     ],

> The popup is loading a javascript file in which a function calls (one
> message off at the time):

>    chrome.extension.onMessage.addListener(
>         function(request, sender, sendResponse) {
>               // do something with the request and answer back via
> sendResponse
>     });

> Am I missing anything?

> CGS


 
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