Adding Required Input Parameters for Custom Field

• viracochadatos

• October 4, 2021 at 1:20 pm

Hi,

I am trying to add a rule to a custom field of mine that says customers can only use certain characters in that field. For instance, I want to ensure they use a capital letter, but not as the first character. As well as no special characters.

Is there anyway to set these rules up?

I need the following parameters for this rule, which is what makes it even trickier.
PASSWORD REQUIREMENTS
Must be at least 8 characters long
Must contain 1 uppercase letter (cannot be first or last character)
Must contain 1 number
Cannot end in a number or special character

Thanks!

Regards,
The Viracocha Datos Team

• John Huebner

• October 5, 2021 at 9:48 am

To do this you use an acf/validate_value filter.

add_filter('acf/validate_value/name=your_field_name', 'your_validate_function_name', 10, 4);
function your_validate_function_name($valid, $value, $field, $input_name) {
  if ($valid !== true) {
    return $valid;
  }
  if (strlen($value) < 8 // < 8 characters
      || preg_match('/^[A-Z]/', $value) // starts with a cap
      || !preg_match('/[A-Z]/, $value) // contains no caps
      || !preg_match('/[0-9]/', $value) // contains no numbers
      || !preg_match('/[0-9a-zA-Z]$/', $value) // ends is something other than a letter or number) {
    $valid = 'Value is not valid';
  }
  return $valid;
}

• viracochadatos

• October 5, 2021 at 10:53 am

Hi John,

Thank you very much for the help!

I am getting an error on the following line: || !preg_match(‘/[0-9a-zA-Z]$/’, $value) // ends is something other than a letter or number) {
$valid = ‘Value is not valid’;

“Your PHP code changes were rolled back due to an error on line 224 of file wp-content/themes/hestia-pro/functions.php. Please fix and try saving again.

syntax error, unexpected ‘a’ (T_STRING), expecting ‘]'”

• John Huebner

• October 5, 2021 at 11:34 am

add_filter('acf/validate_value/name=your_field_name', 'your_validate_function_name', 10, 4);
function your_validate_function_name($valid, $value, $field, $input_name) {
  if ($valid !== true) {
    return $valid;
  }
  if (strlen($value) < 8 // < 8 characters
      || preg_match('/^[A-Z]/', $value) // starts with a cap
      || !preg_match('/[A-Z]/', $value) // contains no caps
      || !preg_match('/[0-9]/', $value) // contains no numbers
      || !preg_match('/[0-9a-zA-Z]$/', $value) // ends is something other than a letter or number
			) {
    $valid = 'Value is not valid';
  }
  return $valid;
}

• viracochadatos

• October 5, 2021 at 2:53 pm

I saved this in the functions.php file but it does not seem to work. I just added a product to the cart with a password that doesn’t match the parameters and it went through.

Is there anything else that may be causing an issue?

Thank you very much for your help so far. I really appreciate it.

Regards,
Jamie

• viracochadatos

• October 5, 2021 at 3:36 pm

I’ve altered it to the following but it is still not working, however it is not returning an error anymore. I think maybe it is not finding the root password field? Any ideas why?

add_filter(‘acf/validate_value/name=root_password’, ‘root_password’, 10, 4);
function root_password($valid, $value, $field, $input_name) {
if ($valid !== true) {
return $valid;
}
if (strlen($value) < 8 // < 8 characters
|| preg_match(‘/^[A-Z]/’, $value) // starts with a cap
|| !preg_match(‘/[A-Z]/’, $value) // contains no caps
|| !preg_match(‘/[0-9]/’, $value) // contains no numbers
|| !preg_match(‘/[0-9a-zA-Z]$/’, $value) // ends is something other than a letter or number
) {
$valid = ‘Value is not valid’;
}
return $valid;
}

Thanks!

• John Huebner

• October 11, 2021 at 9:30 am

I don’t see any reason it should not be working. Try this

add_filter('acf/validate_value/name=your_field_name', 'your_validate_function_name', 10, 4);
function your_validate_function_name($valid, $value, $field, $input_name) {
  return 'this filter is called';
}