on_checkout_rut_validation.liquid

<script type="text/javascript">

  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';
    }
  }
    
  $("#checkout").on("submit", function(){
    if($("#order_other_boleta_o_factura option:selected").val() == "Factura Electrónica"){
      var tax_id = $("#order_billing_address_taxid").val();
      if(!Fn.validaRut(tax_id)){ alert('RUT Inválido.'); }
      return Fn.validaRut(tax_id);
    }
  })
  
</script>