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Trying to fully understand background pages.
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Bartek  
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 More options Nov 11 2009, 4:18 pm
From: Bartek <bart.ci...@gmail.com>
Date: Wed, 11 Nov 2009 13:18:49 -0800 (PST)
Local: Wed, Nov 11 2009 4:18 pm
Subject: Trying to fully understand background pages.
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Hi there,

I'm playing with Browser actions right now and have a popup.html file
which contains 2 elements:

- One is a button that will popup a new window using the regular
window.open command from Javascript.
- The second is a list of recent entries that my extension will fetch
from the service it's for.

My biggest issue right now is not fully understanding how background
pages work with the front end of an extension. I've read the
documentation and only half-understand the message passing that is to
be done.

Right now I have code like so in my popup.html file:
$(document).ready(function() {
    $("#pin").click(function() {
        var q;
        var port = chrome.extension.connect({"name":
"random_test_arg"});

        window.open(....);
    });

});

I understand I need to send a message to my background process to
collect information I want, but how do I get this back and what's the
right way to catch/send the info? In background.html I see this works:

chrome.extension.onConnect.addListener(function(port) {
    var q;
    chrome.tabs.getSelected(null, function(tab) {
        console.log(tab);
        q = tab.url;
    });

});

And I get the correct tab object, with a url, but I have no clue how
to send it back to my front-end function so I can open the window with
the variables I get in my backend.

Hopefully my question makes sense. I'm very close to getting it, but I
just want to verify I'm on the right track here! :)


 
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Matt Perry  
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 More options Nov 11 2009, 4:51 pm
From: Matt Perry <mpcompl...@chromium.org>
Date: Wed, 11 Nov 2009 13:51:01 -0800
Local: Wed, Nov 11 2009 4:51 pm
Subject: Re: [chromium-extensions] Trying to fully understand background pages.
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Message passing is intended for communication between extensions and their
content scripts. Since you're only using popups and a background page, you
can communicated between them using direct javascript calls. See
http://code.google.com/chrome/extensions/extension.html#method-getBac...
-
you can call this from your popup and call methods directly on the
background page, eg:
  // popup.html
  chrome.extension.getBackgroundPage().popupClicked("random_test_arg");

  // background.html
  function popupClicked(arg) { ... }


 
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