/*
 *
 * Copyright (c) 2006/2007 Sam Collett (http://www.texotela.co.uk)
 * Licensed under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Version 2.1
 * 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)
	{
		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") el.cache[v] = oL;
		el.options[el.cache[v]] = option;
		if(sO)
		{
			option.selected = true;
		}
	};
	
	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)
			{
				for(var item in items)
				{
					add(this, item, items[item], sO);
				}
			}
			else
			{
				add(this, v, t, sO);
			}
		}
	);
	return this;
};

/**
 * Add options via ajax
 *
 * @name     ajaxAddOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    String url      Page to get options from (must be valid JSON)
 * @param    Object params   (optional) Any parameters to send with the request
 * @param    Boolean select  (optional) Select the added options, default true
 * @param    Function fn     (optional) Call this function with the select object as param after completion
 * @param    Array args      (optional) Array with params to pass to the function afterwards
 * @example  $("#myselect").ajaxAddOption("myoptions.php");
 * @example  $("#myselect").ajaxAddOption("myoptions.php", {"code" : "007"});
 * @example  $("#myselect").ajaxAddOption("myoptions.php", {"code" : "007"}, false, sortoptions, {"dir": "desc"});
 *
 */
$.fn.ajaxAddOption = function(url, params, select, fn, args)
{
	if(typeof(url) != "string") return this;
	if(typeof(params) != "object") params = {};
	if(typeof(select) != "boolean") select = true;
	this.each(
		function()
		{
			var el = this;
			$.getJSON(url,
				params,
				function(r)
				{
					$(el).addOption(r, select);
					if(typeof fn == "function")
					{
						if(typeof args == "object")
						{
							fn.apply(el, args);
						} 
						else
						{
							fn.call(el);
						}
					}
				}
			);
		}
	);
	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
 *
 */
$.fn.removeOption = function()
{
	var a = arguments;
	if(a.length == 0) return this;
	var ta = typeof(a[0]);
	var v, i;
	// has to be a string or regular expression (object in IE, function in Firefox)
	if(ta == "string" || ta == "object" || ta == "function" ) v = a[0];
	else if(ta == "number") i = 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
			{
				if(remove && a[1] === true) remove = o[i].selected;
				if(remove)
				{
					this.remove(i);
				}
			}
		}
	);
	return this;
};

/**
 * Sort options (ascending or descending) in a select box (or series of select boxes)
 *
 * @name     sortOptions
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    Boolean ascending   (optional) Sort ascending (true/undefined), or descending (false)
 * @example  // ascending
 * $("#myselect").sortOptions(); // or $("#myselect").sortOptions(true);
 * @example  // descending
 * $("#myselect").sortOptions(false);
 *
 */
$.fn.sortOptions = function(ascending)
{
	var a = typeof(ascending) == "undefined" ? true : !!ascending;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return;
			// get options
			var o = this.options;
			// get number of options
			var oL = o.length;
			// create an array for sorting
			var sA = [];
			// loop through options, adding to sort array
			for(var i = 0; i<oL; i++)
			{
				sA[i] = {
					v: o[i].value,
					t: o[i].text
				}
			}
			// sort items in array
			sA.sort(
				function(o1, o2)
				{
					// option text is made lowercase for case insensitive sorting
					o1t = o1.t.toLowerCase(), o2t = o2.t.toLowerCase();
					// if options are the same, no sorting is needed
					if(o1t == o2t) return 0;
					if(a)
					{
						return o1t < o2t ? -1 : 1;
					}
					else
					{
						return o1t > o2t ? -1 : 1;
					}
				}
			);
			// change the options to match the sort array
			for(var i = 0; i<oL; i++)
			{
				o[i].text = sA[i].t;
				o[i].value = sA[i].v;
			}
		}
	);
	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 value  Which options should be selected
 * can be a string or regular expression
 * @param    Boolean clear  Clear existing selected options, default false
 * @example  $("#myselect").selectOptions("val1"); // with the value 'val1'
 * @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);
	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;
};

/**
 * Copy options to another select
 *
 * @name     copyOptions
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    String to  Element to copy to
 * @param    String which  (optional) Specifies which options should be copied - 'all' or 'selected'. Default is 'selected'
 * @example  $("#myselect").copyOptions("#myselect2"); // copy selected options from 'myselect' to 'myselect2'
 * @example  $("#myselect").copyOptions("#myselect2","selected"); // same as above
 * @example  $("#myselect").copyOptions("#myselect2","all"); // copy all options from 'myselect' to 'myselect2'
 *
 */
$.fn.copyOptions = function(to, which)
{
	var w = which || "selected";
	if($(to).size() == 0) 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(w == "all" ||	(w == "selected" && o[i].selected))
				{
					$(to).addOption(o[i].value, o[i].text);
				}
			}
		}
	);
	return this;
};

/**
 * Checks if a select box has an option with the supplied value
 *
 * @name     containsOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     Boolean|jQuery
 * @param    String|RegExp value  Which value to check for. Can be a string or regular expression
 * @param    Function fn          (optional) Function to apply if an option with the given value is found.
 * Use this if you don't want to break the chaining
 * @example  if($("#myselect").containsOption("val1")) alert("Has an option with the value 'val1'");
 * @example  if($("#myselect").containsOption(/^val/i)) alert("Has an option with the value starting with 'val'");
 * @example  $("#myselect").containsOption("val1", copyoption).doSomethingElseWithSelect(); // calls copyoption (user defined function) for any options found, chain is continued
 *
 */
$.fn.containsOption = function(value, fn)
{
	var found = false;
	var v = value;
	var vT = typeof(v);
	var fT = typeof(fn);
	// has to be a string or regular expression (object in IE, function in Firefox)
	if(vT != "string" && vT != "function" && vT != "object") return fT == "function" ? this: found;
	this.each(
		function()
		{
			if(this.nodeName.toLowerCase() != "select") return this;
			// option already found
			if(found && fT != "function") return false;
			// 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))
					{
						found = true;
						if(fT == "function") fn.call(o[i]);
					}
				}
				else
				{
					if (o[i].value == v)
					{
						found = true;
						if(fT == "function") fn.call(o[i]);
					}
				}
			}
		}
	);
	return fT == "function" ? this : found;
};

})(jQuery);