Validate format and verification digit of Chile tax ID (RUT)

validaterut

<script type="text/javascript">
	$(document).ready(function(){
    $("#order_shipping_address_taxid").attr("pattern", "[0-9]{7,8}-[0-9Kk]{1}"); // with . and . [0-9]{1,2}.[0-9]{3}.[0-9]{3}-[0-9Kk]{1}
    $("#order_shipping_address_taxid").attr("placeholder", "ej. 12345678-5");
    $("#order_shipping_address_taxid").attr("title", "ej. 12345678-5");
    
    var Fn = {
    // Valida el rut con su cadena completa "XXXXXXXX-X"
    validaRut : function (rutCompleto) {
      if (!/^[0-9]+[-|‐]{1}[0-9kK]{1}$/.test( rutCompleto ))
        return false;
      var tmp 	= rutCompleto.split('-');
      var digv	= tmp[1]; 
      var rut 	= tmp[0];
      if ( digv == 'K' ) digv = 'k' ;
      return (Fn.dv(rut) == digv );
    },
    dv : function(T){
      var M=0,S=1;
      for(;T;T=Math.floor(T/10))
        S=(S+T%10*(9-M++%6))%11;
      return S?S-1:'k';
    }
  }
    
  $("#checkout").on("submit", function(){
   var tax_id = $("#order_shipping_address_taxid").val();
   if(!Fn.validaRut(tax_id)){ alert('RUT Inválido.'); }
   return Fn.validaRut(tax_id);
	})
  
  $("#checkout").on("submit", function(){
    var option = $("#order_other_boleta_o_factura option:selected").val();
      if(option == 'Factura Electronica'){
        if(!$('#order_other_razon_social').val() || !$('#order_other_giro').val()){
     		  alert('Razón Social o Giro no presente.');
          return false;
        }
      }
  })    
  
  $('#other_razon_social').hide(); // by default hidden
  $('#other_giro').hide(); // by default hidden
  $('#order_other_boleta_o_factura').on('change', function() {   
    var option = $("#order_other_boleta_o_factura option:selected").val();
      if(option == 'Factura Electronica'){
      console.log("Factura Electronica");
      $('#other_razon_social').show();
      $('#other_giro').show();      
    }else{
      $('#other_razon_social').hide();
      $('#other_giro').hide(); 
    }
	})
   
	});
</script>