text: /*
   *
   * Copyright (c) 2006-2011 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 1.3
   * Demo: http://www.texotela.co.uk/code/jquery/numeric/
   *
   */
  (function($) {
  /*
   * Allows only valid characters to be entered into input boxes.
   * Note: fixes value when pasting via Ctrl+V, but not when using the mouse to paste
    *      side-effect: Ctrl+A does not work, though you can still use the mouse to select (or double-click to select all)
   *
   * @name     numeric
   * @param    config      { decimal : "." , negative : true }
   * @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(","); // use , as separater
   * @example  $(".numeric").numeric({ decimal : "," }); // use , as separator
   * @example  $(".numeric").numeric({ negative : false }); // do not allow negative values
   * @example  $(".numeric").numeric(null, callback); // use default values, pass on the 'callback' function
   *
   */
  $.fn.numeric = function(config, callback)
  {
  	if(typeof config === 'boolean')
  	{
  		config = { decimal: config };
  	}
  	config = config || {};
  	// if config.negative undefined, set to true (default is to allow negative numbers)
  	if(typeof config.negative == "undefined") config.negative = true;
  	// set decimal point
  	var decimal = (config.decimal === false) ? "" : config.decimal || ".";
  	// allow negatives
  	var negative = (config.negative === true) ? true : false;
  	// callback function
  	var callback = typeof callback == "function" ? callback : function(){};
  	// set data and methods
  	return this.data("numeric.decimal", decimal).data("numeric.negative", negative).data("numeric.callback", callback).keypress($.fn.numeric.keypress).keyup($.fn.numeric.keyup).blur($.fn.numeric.blur);
  }
  
  $.fn.numeric.keypress = function(e)
  {
  	// get decimal character and determine if negatives are allowed
  	var decimal = $.data(this, "numeric.decimal");
  	var negative = $.data(this, "numeric.negative");
  	// get the key that was pressed
  	var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0;
  	// allow enter/return key (only when in an input box)
  	if(key == 13 && this.nodeName.toLowerCase() == "input")
  	{
  		return true;
  	}
  	else if(key == 13)
  	{
  		return false;
  	}
  	var allow = false;
  	// allow Ctrl+A
  	if((e.ctrlKey && key == 97 /* firefox */) || (e.ctrlKey && key == 65) /* opera */) return true;
  	// allow Ctrl+X (cut)
  	if((e.ctrlKey && key == 120 /* firefox */) || (e.ctrlKey && key == 88) /* opera */) return true;
  	// allow Ctrl+C (copy)
  	if((e.ctrlKey && key == 99 /* firefox */) || (e.ctrlKey && key == 67) /* opera */) return true;
  	// allow Ctrl+Z (undo)
  	if((e.ctrlKey && key == 122 /* firefox */) || (e.ctrlKey && key == 90) /* opera */) return true;
  	// allow or deny Ctrl+V (paste), Shift+Ins
  	if((e.ctrlKey && key == 118 /* firefox */) || (e.ctrlKey && key == 86) /* opera */
  	|| (e.shiftKey && key == 45)) return true;
  	// if a number was not pressed
  	if(key < 48 || key > 57)
  	{
  		/* '-' only allowed at start and if negative numbers allowed */
  		if(this.value.indexOf("-") != 0 && negative && key == 45 && (this.value.length == 0 || ($.fn.getSelectionStart(this)) == 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.keyup = function(e)
  {
  	var val = this.value;
  	if(val.length > 0)
  	{
  		// get carat (cursor) position
  		var carat = $.fn.getSelectionStart(this);
  		// get decimal character and determine if negatives are allowed
  		var decimal = $.data(this, "numeric.decimal");
  		var negative = $.data(this, "numeric.negative");
  		
  		// prepend a 0 if necessary
  		if(decimal != "")
  		{
  			// find decimal point
  			var dot = val.indexOf(decimal);
  			// if dot at start, add 0 before
  			if(dot == 0)
  			{
  				this.value = "0" + val;
  			}
  			// if dot at position 1, check if there is a - symbol before it
  			if(dot == 1 && val.charAt(0) == "-")
  			{
  				this.value = "-0" + val.substring(1);
  			}
  			val = this.value;
  		}
  		
  		// if pasted in, only allow the following characters
  		var validChars = [0,1,2,3,4,5,6,7,8,9,'-',decimal];
  		// get length of the value (to loop through)
  		var length = val.length;
  		// loop backwards (to prevent going out of bounds)
  		for(var i = length - 1; i >= 0; i--)
  		{
  			var ch = val.charAt(i);
  			// remove '-' if it is in the wrong place
  			if(i != 0 && ch == "-")
  			{
  				val = val.substring(0, i) + val.substring(i + 1);
  			}
  			// remove character if it is at the start, a '-' and negatives aren't allowed
  			else if(i == 0 && !negative && ch == "-")
  			{
  				val = val.substring(1);
  			}
  			var validChar = false;
  			// loop through validChars
  			for(var j = 0; j < validChars.length; j++)
  			{
  				// if it is valid, break out the loop
  				if(ch == validChars[j])
  				{
  					validChar = true;
  					break;
  				}
  			}
  			// if not a valid character, or a space, remove
  			if(!validChar || ch == " ")
  			{
  				val = val.substring(0, i) + val.substring(i + 1);
  			}
  		}
  		// remove extra decimal characters
  		var firstDecimal = val.indexOf(decimal);
  		if(firstDecimal > 0)
  		{
  			for(var i = length - 1; i > firstDecimal; i--)
  			{
  				var ch = val.charAt(i);
  				// remove decimal character
  				if(ch == decimal)
  				{
  					val = val.substring(0, i) + val.substring(i + 1);
  				}
  			}
  		}
  		// set the value and prevent the cursor moving to the end
  		this.value = val;
  		$.fn.setSelection(this, carat);
  	}
  }
  
  $.fn.numeric.blur = function()
  {
  	var decimal = $.data(this, "numeric.decimal");
  	var callback = $.data(this, "numeric.callback");
  	var val = this.value;
  	if(val != "")
  	{
  		var re = new RegExp("^\\d+$|\\d*" + decimal + "\\d+");
  		if(!re.exec(val))
  		{
  			callback.apply(this);
  		}
  	}
  }
  
  $.fn.removeNumeric = function()
  {
  	return this.data("numeric.decimal", null).data("numeric.negative", null).data("numeric.callback", null).unbind("keypress", $.fn.numeric.keypress).unbind("blur", $.fn.numeric.blur);
  }
  
  // Based on code from http://javascript.nwbox.com/cursor_position/ (Diego Perini <dperini@nwbox.com>)
  $.fn.getSelectionStart = function(o)
  {
  	if (o.createTextRange)
  	{
  		var r = document.selection.createRange().duplicate();
  		r.moveEnd('character', o.value.length);
  		if (r.text == '') return o.value.length;
  		return o.value.lastIndexOf(r.text);
  	} else return o.selectionStart;
  }
  
  // set the selection, o is the object (input), p is the position ([start, end] or just start)
  $.fn.setSelection = function(o, p)
  {
  	// if p is number, start and end are the same
  	if(typeof p == "number") p = [p, p];
  	// only set if p is an array of length 2
  	if(p && p.constructor == Array && p.length == 2)
  	{
  		if (o.createTextRange)
  		{
  			var r = o.createTextRange();
  			r.collapse(true);
  			r.moveStart('character', p[0]);
  			r.moveEnd('character', p[1]);
  			r.select();
  		}
  		else if(o.setSelectionRange)
  		{
  			o.focus();
  //			o.setSelectionRange(p[0], p[1]);
  		}
  	}
  }
  
  })(jQuery);