checkout_document_RUT_Validation.liquid

<script>
$(document).ready(function(){
  addRutValidator($('#order_shipping_address_taxid'));
  addRutValidatorForBillingAddress($('#order_billing_address_taxid'));
  $("#shipping_same_as_billing").on('change', function(evt) {
    addRutValidatorForBillingAddress($('#order_billing_address_taxid'));
  })
})

function addRutValidatorForBillingAddress(element) {
  if($("#shipping_same_as_billing:checked").val() == 1){
    element.prop('required', false);
    element.unbind('keyup', checkRut);
    $('#order_billing_address_municipality').prop('required', false);
  }
  else {
    $('#order_billing_address_municipality').prop('required', true);
    addRutValidator(element);
  }
}


function addRutValidator(element) {
  element.prop('required', true);

  element.bind('keyup', checkRut)
}

function checkRut(evt) {
    var rut = evt.currentTarget
    // remove dots
    var value = rut.value.replace('.', '');
    // remove dash
    value = value.replace('-', '');

    // isolate rutBody and Dígito Verificador
    rutBody = value.slice(0, -1);
    digit = value.slice(-1).toUpperCase();

    // Format RUN
    rut.value = rutBody + '-'+ digit;

    // Si no cumple con el mínimo ej. (n.nnn.nnn)
    if(rutBody.length < 7) {
      rut.setCustomValidity("RUT Incompleto");
      return false;
    }

    // calculate digit verifier
    digitsSum = 0;
    multiplier = 2;

    // for each digit on rutBody
    for (i=1; i <= rutBody.length; i++) {

        // get product of corresponding multiplier
        index = multiplier * value.charAt(rutBody.length - i);

        // add digt sum to counter
        digitsSum = digitsSum + index;

        if (multiplier < 7) {
          multiplier = multiplier + 1;
        } else {
          multiplier = 2;
        }

    }

    // calculate digitVerifier on base module 11
    digitVerifier = 11 - (digitsSum % 11);

    // special cases (0 and K)
    digit = (digit == 'K')?10:digit;
    digit = (digit == 0)?11:digit;

    // validtes rutBody with his digit
    if(digitVerifier != digit) {
      rut.setCustomValidity("RUT Inválido");
      return false;
    }

    rut.setCustomValidity('');
}
</script>