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Display Dialog from Chrome Extension

I am trying to display a modal Javascript dialog box in Chrome when a user creates a bookmark. However, after trying Closure and SimpleModal+JQuery, I can't seem to get a dialog box to appear. Is this a restriction of extensions in Chrome, or am I doing something very wrong? (I'm still learning Javascript, so my lack of understanding it could very well be the reason.)

Here is my code using Closure. It does make it into the function, so that's working okay. Any suggestions? Thanks!

<html>
    <head>
        <script src="./lib/closure-library/closure/goog/base.js"></script>
        <script type="text/javascript" src="./lib/closure-library/closure/goog/deps.js"></script>
        <script>goog.require('goog.ui.Dialog');</script>
        <script type="text/javascript">
            chrome.bookmarks.onCreated.addListener(function(id, bookmark) {
                // Setup the dialog box.
                var dialog1 = new goog.ui.Dialog();
                dialog1.setContent('[Insert Placeholder]');
                dialog1.setTitle('Title Placeholder');

                // Display dialog.
                dialog1.setVisible(true);
            });
        </script>
    </head>
    <body>
        <!-- Do Nothing -->
    </body>
</html>

You cannot use a dialog like this in a background page:

background-pages

You can do that for options page:

Google Chrome Extensions Options

So in your case, you would want to listen onCreated for bookmarks, and since you want to do a dialog box, you would need to communicate to the page itself. Therefore, you get the selectedTab via :

method-getselected

Once you get the tab, you can then execute the JavaScript:

method-executescript

To clarify Mohamed's answer a bit, closure's modal dialog is in-page HTML. This is probably actually working in your code, but since you're doing it in the background page, and the background page isn't visible, you don't see it. You can use techniques that use window.open or window.alert from the background page, but not things that are trying to display interactive HTML to the user. For that, you'll need to get the content into a popup window or into the page itself as Mohamed suggests.

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