Reply To: URL Field – tel: link rather than http:

• John Huebner

• November 9, 2023 at 8:35 am

The URL will only take a web page URL and there isn’t a way to alter this.

I use the following to add a setting to use text field an validate

<?php 

  add_action('acf/render_field_validation_settings/type=text', 'validate_text_as_href_setting');
  add_action('acf/validate_value/type=text', 'validate_text_as_href', 10, 4);
    
  function validate_text_as_href_setting($field) {
    // this adds a setting to text fields
    // setting it to true will require that the content of the fields
    // meets requirements to be used as a link href value
    $args = array(
      'label' => 'Validate as HREF',
      'instructions' => 'Require a valid href attribute. This includes values starting with: http://, https://, ftp://, mailto:, tel:, sms:, /, and #',
      'type' => 'true_false',
      'name' => 'validate_href',
      'ui' => 1,
      'class' => ''
    );
    acf_render_field_setting($field, $args);
  }
    
  function validate_text_as_href($valid, $value, $field, $input) {
    // if the setting created by validate_text_as_href_setting
    // is true than this filter will test input to ensure it can
    // be used in as a link href value
    // this allows links starting with
    // / (site root relative), http://, https://, ftp://, # (anchor), mailto:, tel:, sms:
    if (!$valid) {
      return $valid;
    }
    // does setting exist and is it set
    if (!empty($field['validate_href'])) {
      // only validate if value submitted (use acf required setting to require value)
      if (!empty($value)) {
        // allow anything that looks like a valid href value
        if (!preg_match('%^(https?\://|ftp\://|/|#|mailto\:|sms\:|tel\:)%', $value)) {
          $valid = 'Enter a Valid Link HREF Value';
        }
      }
    }
    return $valid;
  }