/**
* ensure specified input fields will accept those predefined values
* two configurable options
* 1. allow: only those specified within this option will be acceptable
* 2. disallow: anything (or only those specified within allow option if allow option isn't empty)
* will be acceptable except those specified within this option
*/

jQuery.fn.inputValue = function(options)
{
 var settings = jQuery.extend({allow:'', disallow:''}, options);
 return jQuery(this).keypress
 (
     function (e)
     {
         if (!e.charCode)
         var code = String.fromCharCode(e.which);
         else
         var code = String.fromCharCode(e.charCode);
         if(code && (typeof(e.keyCode) == 'undefined' || (e.keyCode != 8 && e.keyCode != 46)))
         {
             if(settings.allow.length != 0 && settings.disallow.length != 0)
             {
                 if(settings.allow.indexOf(code) == -1)
                 {
                     e.preventDefault();
                 }else if(settings.disallow.indexOf(code) != -1)
                 {
                    e.preventDefault();
                 }
             }else if(settings.allow.length != 0)
             {
                 if(settings.allow.indexOf(code) == -1)
                 {
                    e.preventDefault();
                 }
             }else if(settings.disallow.length != 0)
             {
                 if(settings.disallow.indexOf(code) != -1)
                 {
                    e.preventDefault();
                 }
             }
         }
         if (e.ctrlKey && code=='v')
         e.preventDefault();
         $(this).bind('contextmenu',function () {return false});
     }
 );
};


jQuery.fn.inputLength = function(max)
{
     var maxL = max - 1;
     return jQuery(this).keypress
     (
         function (e)
         {
             if (!e.charCode)
             var code = String.fromCharCode(e.which);
             else
             var code = String.fromCharCode(e.charCode);
             if(code && (typeof(e.keyCode) == 'undefined' || (e.keyCode != 8 && e.keyCode != 46)))
             {
                if (jQuery(this).val().length > maxL)
                {
                    e.preventDefault();    
                }
             }
             if (e.ctrlKey && code=='v')
             e.preventDefault();
             $(this).bind('contextmenu',function () {return false});
         }
     );
};



jQuery.fn.maxLength = function(max)
{
     return this.each (function()
        {
         jQuery(this).inputLength(max);
         }
     );
};


/**
* input fields will accept valid email address
*/

jQuery.fn.inputEmail = function()
{
     return this.each (function()
        {
         jQuery(this).inputValue({allow:'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@.0123456789'});
         }
     );
};

/**
* input fields will accept digits only
*/

jQuery.fn.inputInteger = function()
{
     return this.each (function()
         {
         jQuery(this).inputValue({allow:'9876543210'});
         }
     );
};

/**
* input fields will accept digits and dots.
*/
jQuery.fn.inputFloat = function()
{
     return this.each (function()
         {
         jQuery(this).inputValue({allow:'0123456789.'});
         }
     );
};

/**
* input fields will accept all letters (case insensitive)
*/
jQuery.fn.inputLetter = function()
{
     return this.each (function()
         {
         jQuery(this).inputValue({allow:'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'});
         }
     );
};