/*
 *
 * Copyright (c) 2006-2010 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 1.2
 * Demo: http://www.texotela.co.uk/code/jquery/numeric/
 *
 */
(function($) {
/*
 * Allows only valid characters to be entered into input boxes.
 * Note: does not validate that the final text is a valid number
 * (that could be done by another script, or server-side)
 *
 * @name     numeric
 * @param    decimal      Decimal separator (e.g. '.' or ',' - default is '.'). Pass false for integers
 * @param    callback     A function that runs if the number is not valid (fires onblur)
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @example  $(".numeric").numeric();
 * @example  $(".numeric").numeric(",");
 * @example  $(".numeric").numeric(null, callback);
 *
 */
$.fn.numeric = function(decimal, callback)
{
	decimal = (decimal === false) ? "" : decimal || ".";
	callback = typeof callback == "function" ? callback : function(){};
	return this.data("numeric.decimal", decimal).data("numeric.callback", callback).keypress($.fn.numeric.keypress).blur($.fn.numeric.blur);
}

$.fn.numeric.keypress = function(e)
{
	var decimal = $.data(this, "numeric.decimal");
	var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0;
	// allow enter/return key (only when in an input box)
	if(key == 13 && this.nodeName.toLowerCase() == "input")
	{
		return true;
	}
	else if(key == 13)
	{
		return false;
	}
	var allow = false;
	// allow Ctrl+A
	if((e.ctrlKey && key == 97 /* firefox */) || (e.ctrlKey && key == 65) /* opera */) return true;
	// allow Ctrl+X (cut)
	if((e.ctrlKey && key == 120 /* firefox */) || (e.ctrlKey && key == 88) /* opera */) return true;
	// allow Ctrl+C (copy)
	if((e.ctrlKey && key == 99 /* firefox */) || (e.ctrlKey && key == 67) /* opera */) return true;
	// allow Ctrl+Z (undo)
	if((e.ctrlKey && key == 122 /* firefox */) || (e.ctrlKey && key == 90) /* opera */) return true;
	// allow or deny Ctrl+V (paste), Shift+Ins
	if((e.ctrlKey && key == 118 /* firefox */) || (e.ctrlKey && key == 86) /* opera */
	|| (e.shiftKey && key == 45)) return true;
	// if a number was not pressed
	if(key < 48 || key > 57)
	{
		/* '-' only allowed at start */
		if(key == 45 && this.value.length == 0) return true;
		/* only one decimal separator allowed */
		if(decimal && key == decimal.charCodeAt(0) && this.value.indexOf(decimal) != -1)
		{
			allow = false;
		}
		// check for other keys that have special purposes
		if(
			key != 8 /* backspace */ &&
			key != 9 /* tab */ &&
			key != 13 /* enter */ &&
			key != 35 /* end */ &&
			key != 36 /* home */ &&
			key != 37 /* left */ &&
			key != 39 /* right */ &&
			key != 46 /* del */
		)
		{
			allow = false;
		}
		else
		{
			// for detecting special keys (listed above)
			// IE does not support 'charCode' and ignores them in keypress anyway
			if(typeof e.charCode != "undefined")
			{
				// special keys have 'keyCode' and 'which' the same (e.g. backspace)
				if(e.keyCode == e.which && e.which != 0)
				{
					allow = true;
					// . and delete share the same code, don't allow . (will be set to true later if it is the decimal point)
					if(e.which == 46) allow = false;
				}
				// or keyCode != 0 and 'charCode'/'which' = 0
				else if(e.keyCode != 0 && e.charCode == 0 && e.which == 0)
				{
					allow = true;
				}
			}
		}
		// if key pressed is the decimal and it is not already in the field
		if(decimal && key == decimal.charCodeAt(0))
		{
			if(this.value.indexOf(decimal) == -1)
			{
				allow = true;
			}
			else
			{
				allow = false;
			}
		}
	}
	else
	{
		allow = true;
	}
	return allow;
}

$.fn.numeric.blur = function()
{
	var decimal = $.data(this, "numeric.decimal");
	var callback = $.data(this, "numeric.callback");
	var val = $(this).val();
	if(val != "")
	{
		var re = new RegExp("^\\d+$|\\d*" + decimal + "\\d+");
		if(!re.exec(val))
		{
			callback.apply(this);
		}
	}
}

$.fn.removeNumeric = function()
{
	return this.data("numeric.decimal", null).data("numeric.callback", null).unbind("keypress", $.fn.numeric.keypress).unbind("blur", $.fn.numeric.blur);
}
$.fn.toggleCheckboxes = function(filter, returnChecked)
{
	filter = filter || "*";
	returnChecked = returnChecked || false;
	var returnWhat = $([]);
	this.each(
		function()
		{
			var checked = $("input[type=checkbox]", this).filter(filter).each(
				function()
				{
					this.checked = !this.checked;
				}
			).filter(":checked");
			returnWhat = checked;
		}
	);
	if(!returnChecked)
	{
		returnWhat = this;
	}
	return returnWhat;
};

/*
 * Check all checkboxes contained within a form
 *
 * @name     checkCheckboxes
 * @param    filter   only check checkboxes matching this expression
 * @param    returnChecked   return checkboxes as jQuery object, default false
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @example  $("#myform").checkCheckboxes();
 * @example  $("#myform").checkCheckboxes(".onlyme");
 * @example  $("#myform").checkCheckboxes(":not(.notme)");
 * @example  $("#myform").checkCheckboxes("*", true);
 *
 */
$.fn.checkCheckboxes = function(filter, returnChecked)
{
	filter = filter || "*";
	returnChecked = returnChecked || false;
	var returnWhat = $([]);
	this.each(
		function()
		{
			var checked = $("input[type=checkbox]", this).filter(filter).each(
				function()
				{
					this.checked = true;
				}
			).filter(":checked");
			returnWhat = checked;
		}
	);
	if(!returnChecked)
	{
		returnWhat = this;
	}
	return returnWhat;
};

/*
 * UnCheck all checkboxes contained within a form
 *
 * @name     unCheckCheckboxes
 * @param    filter   only check checkboxes matching this expression
 * @param    returnUnChecked   return unchecked checkboxes as jQuery object, default false
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @example  $("#myform").unCheckCheckboxes();
 * @example  $("#myform").unCheckCheckboxes(".onlyme");
 * @example  $("#myform").unCheckCheckboxes(":not(.notme)");
 * @example  $("#myform").unCheckCheckboxes("*", true);
 *
 */
$.fn.unCheckCheckboxes = function(filter, returnUnChecked)
{
	filter = filter || "*";
	returnUnChecked = returnUnChecked || false;
	var returnWhat = $([]);
	this.each(
		function()
		{
			var unChecked = $("input[type=checkbox]", this).filter(filter).each(
				function()
				{
					this.checked = false;
				}
			).filter(":not(:checked)");
			returnWhat = unChecked;
		}
	);
	if(!returnUnChecked)
	{
		returnWhat = this;
	}
	return returnWhat;
};

/*
 * Makes checkboxes behave like a radio button group
 *   i.e. only one can be selected at a time
 *
 * @name     radioCheckboxGroup
 * @param    name  field name (leave blank to apply to all check boxes)
 * @param    filter  apply to checkboxes matching this expression
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @example  $.radioCheckboxGroup("fieldname");
 * @example  $.radioCheckboxGroup("fieldname", ".myclass");
 * @example  $.radioCheckboxGroup("", ".myclass");
 *
 */
$.radioCheckboxGroup = function(name, filter)
{
	filter = filter || "*";
	var expression = "input[type=checkbox]";
	if(name)
	{
		expression += "[name=" + name + "]"
	}
	var x = $(expression).filter(filter);
	x.click(
		function()
		{
			// uncheck every other box with the same name
			x.not(this).each(
				function()
				{
					this.checked = false;
				}
			).end();
		}
	);
};
})(jQuery);