/*

  Author - Rudolf Naprstek
  Website - http://www.thimbleopensource.com/tutorials-snippets/jquery-plugin-filter-text-input
  Version - 1.2.0
  Release - 20th November 2010

  Thanks to Niko Halink from ARGH!media for bugfix!

*/

(function($){  
  
    $.fn.extend({   

        filter_input: function(options) {  

          var defaults = {  
              regex:".*",
              live:false
          }  
                
          var options =  $.extend(defaults, options);  
          var regex = new RegExp(options.regex);
          
          function filter_input_function(event) {

            var key = event.charCode ? event.charCode : event.keyCode ? event.keyCode : 0;

            // 8 = backspace, 9 = tab, 13 = enter, 35 = end, 36 = home, 37 = left, 39 = right, 46 = delete
            if (key == 8 || key == 9 || key == 13 || key == 35 || key == 36|| key == 37 || key == 39 || key == 46) {

              if ($.browser.mozilla) {

                // if charCode = key & keyCode = 0
                // 35 = #, 36 = $, 37 = %, 39 = ', 46 = .
         
                if (event.charCode == 0 && event.keyCode == key) {
                  return true;                                             
                }

              }
            }


            var string = String.fromCharCode(key);
            if (regex.test(string)) {
              return true;
            } 
            return false;
          }
          
          if (options.live) {
            $(this).live('keypress', filter_input_function); 
          } else {
            return this.each(function() {  
              var input = $(this);
              input.unbind('keypress').keypress(filter_input_function);
            });  
          }
          
        }  
    });  
      
})(jQuery);