/*

 *

 * 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 1.0
 * Demo: http://www.texotela.co.uk/code/jquery/numeric/
 *
 * $LastChangedDate: 2007-05-29 11:31:36 +0100 (Tue, 29 May 2007) $
 * $Rev: 2005 $

 */

 

/*

 * 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 '.')

 * @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);

 *

 */

jQuery.fn.numeric = function(decimal, callback)

{

	decimal = decimal || ".";

	callback = typeof callback == "function" ? callback : function(){};

	this.keypress(

		function(e)

		{

			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 one decimal separator allowed */

				if(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;

						}

						// 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(key == decimal.charCodeAt(0) && this.value.indexOf(decimal) == -1)

				{

					allow = true;

				}

			}

			else

			{

				allow = true;

			}

			return allow;

		}

	)

	.blur(

		function()

		{

			var val = jQuery(this).val();

			if(val != "")

			{

				var re = new RegExp("^\\d+$|\\d*" + decimal + "\\d+");

				if(!re.exec(val))

				{

					callback.apply(this);

				}

			}

		}

	);

	return this;

}