/*
 * File:        chromatable.js
 * Version:     1.3.0
 * CVS:         $Id$
 * Description: Make a "sticky" header at the top of the table, so it stays put while the table scrolls
 * Author:      Zachary Siswick
 * Created:     Thursday 19 November 2009 8:53pm 
 * Language:    Javascript
 *
 */ 
(function ($) {
    $.chromatable = {
        // Default options
        defaults: {
            //specify a pixel dimension, auto, or 100%
            width: "900px",
            height: "300px",
            scrolling: "yes"
        }
    };
    $.fn.chromatable = function (options) {
        // Extend default options
        var options = $.extend({}, $.chromatable.defaults, options);
        return this.each(function () {
            // Add jQuery methods to the element
            var $this = $(this);
            var $uniqueID = $(this).attr("ID") + ("wrapper");
            //Add dimentsions from user or default parameters to the DOM elements
            $(this).css('width', options.width).addClass("_scrolling");
            $(this).wrap('<div class="scrolling_outer"><div id="' + $uniqueID + '" class="scrolling_inner"></div></div>');
            $(".scrolling_outer").css({
                'position': 'relative'
            });
            $("#" + $uniqueID).css({
                'overflow-x': 'hidden',
                'overflow-y': 'auto',
                'padding-right': '17px'
            });
            $("#" + $uniqueID).css('height', options.height);
            $("#" + $uniqueID).css('width', options.width);
            // clone an exact copy of the scrolling table and add to DOM before the original table
            // replace old class with new to differentiate between the two
            $(this).before($(this).clone().attr("id", "").addClass("_thead").css({
                'width': 'auto',
                'display': 'block',
                'position': 'absolute',
                'border': 'none',
                'border-bottom': '1px solid #CCC',
                'top': '0'
            }));
            // remove all children within the cloned table after the thead element
            $('._thead').children('tbody').remove();
            $(this).each(function ($this) {
                // if the width is auto, we need to remove padding-right on scrolling container	
                if (options.width == "100%" || options.width == "auto") {
                    $("#" + $uniqueID).css({
                        'padding-right': '0px'
                    });
                }
                if (options.scrolling == "no") {
                    $("#" + $uniqueID).before('<a href="#" class="expander" style="width:100%;">Expand table</a>');
                    $("#" + $uniqueID).css({
                        'padding-right': '0px'
                    });
                    $(".expander").each(function (int) {
                        $(this).attr("ID", int);
                        $(this).bind("click", function () {
                            $("#" + $uniqueID).css({
                                'height': 'auto'
                            });
                            $("#" + $uniqueID + " ._thead").remove();
                            $(this).remove();
                        });
                    });
                    //this is dependant on the jQuery resizable UI plugin
                    $("#" + $uniqueID).resizable({
                        handles: 's'
                    }).css("overflow-y", "hidden");
                }
            });
            // Get a relative reference to the "sticky header"
            $curr = $this.prev();
            // Copy the cell widths across from the original table
            $("thead:eq(0)>tr th", this).each(function (i) {
                $("thead:eq(0)>tr th:eq(" + i + ")", $curr).width($(this).width());
            });
            //check to see if the width is set to auto, if not, we don't need to call the resizer function
            if (options.width == "100%" || "auto") {
                // call the resizer function whenever the table width has been adjusted
                $(window).resize(function () {
                    resizer($this);
                });
            }
        });
    };
    // private function to temporarily hide the header when the browser is resized
    function resizer($this) {
        // Need a relative reference to the "sticky header"
        $curr = $this.prev();
        $("thead:eq(0)>tr th", $this).each(function (i) {
            $("thead:eq(0)>tr th:eq(" + i + ")", $curr).width($(this).width());
        });
    };
})(jQuery);