jquery.comments.js

/*
 * Author: mitzip
 * More info: mitzip.com
 * License: Public Domain (http://unlicense.org)
 * Requires: jQuery 1.2+
 *
 */
(function($) {
    $.fn.comments = function(regexFilter) {
        // for dumb non-compliant browsers, like Microsoft Internet Explorer
        Node = Node || {
            COMMENT_NODE: 8
        };
		
        // Using multiple try/catch blocks to catch permission 
        // and security errors from various browsers for accessing
        // cross-domain iframes. If no security/permission error
        // is thrown, then using the iframe tag with comments()
        // will return the comments inside the iframe.
	
        return this.find('*').filter(function() {
            // try to access the contents of the DOM node
            try {
                return typeof $(this).contents() === 'object';
            }
            // if access is denied (Chrome), filter out of results
            catch(e) {
                return false;
            }
        }).contents().filter(function() {
            // try to access node type, 
            // in case accessing via contents()
            // doesn't throw error, like in Firefox
            try {
                return this.nodeType === Node.COMMENT_NODE;
            }
            // if access is denied, filter out of results
            catch(e) {
                return false;
            }
        }).filter(function() {
            // if regular expression is provided, filter comments based on it
            if (regexFilter)
                return regexFilter.test(this.nodeValue);
            // else return all comments found
            else
                return true;
        });
    }
})(jQuery);