var RR_LISTBOX_PREFIX_STR='rk_';
var RR_LISTBOX_PREFIX=new RegExp('^'+RR_LISTBOX_PREFIX_STR);
var RR_LISTGROUP_PREFIX=/^gr_/;

/*
 *
 * Copyright (c) 2006-2009 Sam Collett (http://www.texotela.co.uk)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 * Version 2.2.4
 * Demo: http://www.texotela.co.uk/code/jquery/select/
 *
 * $LastChangedDate$
 * $Rev$
 *
 */
 
(function($) {
 
/**
 * Adds (single/multiple) options to a select box (or series of select boxes)
 *
 * @name     addOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @example  $("#myselect").addOption("Value", "Text"); // add single value (will be selected)
 * @example  $("#myselect").addOption("Value 2", "Text 2", false); // add single value (won't be selected)
 * @example  $("#myselect").addOption({"foo":"bar","bar":"baz"}, false); // add multiple values, but don't select
 *
 */
$.fn.addOption = function()
{
	var add = function(el, v, t, sO, group)
	{
		var option = document.createElement("option");
		option.value = v, option.text = t;
		// get options
		var o = el.options;
		// get number of options
		var oL = o.length;
		if(!el.cache)
		{
			el.cache = {};
			// loop through existing options, adding to cache
			for(var i = 0; i < oL; i++)
			{
				el.cache[o[i].value] = i;
			}
		}
		// add to cache if it isn't already
		if(typeof el.cache[v] == "undefined")
		{
			if(group && group.tagName.toUpperCase()=='OPTGROUP')
			{
				group.appendChild(option);
				//explorer zapomene text svine
				option.innerText=option.text;
			}
			else
			{
				el.options[oL] = option;
			}
		}
		else
		{
			el.options[el.cache[v]] = option;
		}
		if(sO)
		{
			option.selected = true;
		}
	};
	
	var addGroup = function(el, t)
	{
		var optgroup = document.createElement("optgroup");
		optgroup.label = t;
		el.appendChild(optgroup);
		return optgroup;
	};
	
	var a = arguments;
	if(a.length == 0) return this;
	// select option when added? default is true
	var sO = true;
	// multiple items
	var m = false;
	// other variables
	var items, v, t;
	if(typeof(a[0]) == "object")
	{
		m = true;
		items = a[0];
	}
	if(a.length >= 2)
	{
		if(typeof(a[1]) == "boolean") sO = a[1];
		else if(typeof(a[2]) == "boolean") sO = a[2];
		if(!m)
		{
			v = a[0];
			t = a[1];
		}
	}
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return;
			if(m)
			{
				var lastGroup=null;
				for(var item in items)
				{
					//pokud chci optgroup
					if(RR_LISTGROUP_PREFIX.test(item))
					{
						//console.log('addgroup '+items[item]);
						lastGroup=addGroup(this,items[item]);
					}
					else
					{
						add(this, item.replace(RR_LISTBOX_PREFIX,''), items[item], sO, lastGroup);
					}
				}
			}
			else
			{
				add(this, v, t, sO);
			}
		}
	);
	return this;
};

/**
 * Removes an option (by value or index) from a select box (or series of select boxes)
 *
 * @name     removeOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    String|RegExp|Number what  Option to remove
 * @param    Boolean selectedOnly       (optional) Remove only if it has been selected (default false)   
 * @example  $("#myselect").removeOption("Value"); // remove by value
 * @example  $("#myselect").removeOption(/^val/i); // remove options with a value starting with 'val'
 * @example  $("#myselect").removeOption(/./); // remove all options
 * @example  $("#myselect").removeOption(/./, true); // remove all options that have been selected
 * @example  $("#myselect").removeOption(0); // remove by index
 * @example  $("#myselect").removeOption(["myselect_1","myselect_2"]); // values contained in passed array
 *
 */
$.fn.removeOption = function()
{
	var a = arguments;
	if(a.length == 0) return this;
	var ta = typeof(a[0]);
	var v, index;
	// has to be a string or regular expression (object in IE, function in Firefox)
	if(ta == "string" || ta == "object" || ta == "function" )
	{
		v = a[0];
		// if an array, remove items
		if(v.constructor == Array)
		{
			var l = v.length;
			for(var i = 0; i<l; i++)
			{
				this.removeOption(v[i], a[1]); 
			}
			return this;
		}
	}
	else if(ta == "number") index = a[0];
	else return this;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return;
			// clear cache
			if(this.cache) this.cache = null;
			// does the option need to be removed?
			var remove = false;
			// get options
			var o = this.options;
			if(!!v)
			{
				// get number of options
				var oL = o.length;
				for(var i=oL-1; i>=0; i--)
				{
					if(v.constructor == RegExp)
					{
						if(o[i].value.match(v))
						{
							remove = true;
						}
					}
					else if(o[i].value == v)
					{
						remove = true;
					}
					// if the option is only to be removed if selected
					if(remove && a[1] === true) remove = o[i].selected;
					if(remove)
					{
						o[i] = null;
					}
					remove = false;
				}
			}
			else
			{
				// only remove if selected?
				if(a[1] === true)
				{
					remove = o[index].selected;
				}
				else
				{
					remove = true;
				}
				if(remove)
				{
					this.remove(index);
				}
			}
		}
	);
	return this;
};


/**
 * Selects an option by value
 *
 * @name     selectOptions
 * @author   Mathias Bank (http://www.mathias-bank.de), original function
 * @author   Sam Collett (http://www.texotela.co.uk), addition of regular expression matching
 * @type     jQuery
 * @param    String|RegExp|Array value  Which options should be selected
 * can be a string or regular expression, or an array of strings / regular expressions
 * @param    Boolean clear  Clear existing selected options, default false
 * @example  $("#myselect").selectOptions("val1"); // with the value 'val1'
 * @example  $("#myselect").selectOptions(["val1","val2","val3"]); // with the values 'val1' 'val2' 'val3'
 * @example  $("#myselect").selectOptions(/^val/i); // with the value starting with 'val', case insensitive
 *
 */
$.fn.selectOptions = function(value, clear)
{
	var v = value;
	var vT = typeof(value);
	// handle arrays
	if(vT == "object" && v.constructor == Array)
	{
		var $this = this;
		$.each(v, function()
			{
      				$this.selectOptions(this, clear);
    			}
		);
	};
	var c = clear || false;
	// has to be a string or regular expression (object in IE, function in Firefox)
	if(vT != "string" && vT != "function" && vT != "object") return this;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return this;
			// get options
			var o = this.options;
			// get number of options
			var oL = o.length;
			for(var i = 0; i<oL; i++)
			{
				if(v.constructor == RegExp)
				{
					if(o[i].value.match(v))
					{
						o[i].selected = true;
					}
					else if(c)
					{
						o[i].selected = false;
					}
				}
				else
				{
					if(o[i].value == v)
					{
						o[i].selected = true;
					}
					else if(c)
					{
						o[i].selected = false;
					}
				}
			}
		}
	);
	return this;
};

/**
 * Returns values which have been selected
 *
 * @name     selectedValues
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     Array
 * @example  $("#myselect").selectedValues();
 *
 */
$.fn.selectedValues = function()
{
	var v = [];
	this.selectedOptions().each(
		function()
		{
			v[v.length] = this.value;
		}
	);
	return v;
};

/**
 * Returns text which has been selected
 *
 * @name     selectedTexts
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     Array
 * @example  $("#myselect").selectedTexts();
 *
 */
$.fn.selectedTexts = function()
{
	var t = [];
	this.selectedOptions().each(
		function()
		{
			t[t.length] = this.text;
		}
	);
	return t;
};

/**
 * Returns options which have been selected
 *
 * @name     selectedOptions
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @example  $("#myselect").selectedOptions();
 *
 */
$.fn.selectedOptions = function()
{
	return this.find("option:selected");
};

})(jQuery);