/*
 * jQuery doubleSelect Plugin
 * version: 1.1
 * @requires jQuery v1.3.2 or later
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * @version $Id: jquery.doubleSelect.js 3 2009-04-24 12:00:00Z $
 * @author  Johannes Geppert <post at jgeppert dot com> http://www.jgeppert.com
 */

/**
 * Converts passed JSON options into <select> elements.
 * 
 * @param String
 *            id of the second select box
 * @param String
 *            option values
 * @param array
 *            options additional options (optional)
 */

( function($) {
	$.fn.doubleSelect = function(doubleid, values, options) {

		options = $.extend( {
			preselectFirst :null,
			preselectSecond :null,
			emptyOption :false,
			emptyKey :-1,
			emptyValue :'Choose ...'
		}, options || {});

		var $first = this;
		var $secondid = "#" + doubleid;
		var $second = $($secondid);

		var setValue = function(value) {
			$second.val(value).change();
		}

		var removeValues = function() {
			$($secondid + " option").remove();
		};

		$(this).change( function() {
			removeValues();
			$current = this.options[this.selectedIndex].value;
			if ($current != '') {
				$.each(values, function(k, v) {
					if ($current == v.key) {
						$.each(v.values, function(k, v2) {
							var o = $("<option>").html(k).attr('value', v2);
							if (v.defaultvalue != null && v2 == v.defaultvalue) {
								o.html(k).attr("selected","selected");
							}
							if (options.preselectSecond != null && v2 == options.preselectSecond) {
								o.html(k).attr("selected","selected");
							}
							o.appendTo($second);
						});

					}

				});

			} else {
				setValue(options.emptyValue);
			}
		});

		return this.each( function() {
			$first.children().remove();
			$second.children().remove();

			if (options.emptyOption) {
				var oe = $("<option>").html(options.emptyValue).attr('value', options.emptyKey);
				oe.appendTo($first);
			}

			$.each(values, function(k, v) {
				var of = $("<option>").html(k).attr('value', v.key);
				if (options.preselectFirst != null && v.key == options.preselectFirst) {
					of.html(k).attr("selected","selected");
				}
				of.appendTo($first);

			});
			
			 	if (options.preselectFirst == null) {
				$current = this.options[this.selectedIndex].value;
				if ($current != '') {
					$.each(values, function(k, v) {
						if ($current == v.key) {
							$.each(v.values, function(k, v2) {
								var o = $("<option>").html(k).attr('value', v2);
								if (v.defaultvalue != null && v2 == v.defaultvalue) {
									o.html(k).attr("selected","selected");
								}
								if (options.preselectSecond != null && v2 == options.preselectSecond) {
									o.html(k).attr("selected","selected");
								}
								o.appendTo($second);
							});
						}

					});

				} else {
					setValue(options.emptyValue);
				}
			} else {
				$first.change();
			}

		});

	};
})(jQuery);