app/assets/javascripts/admin/users/new.js


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const DATA_ATTR_REGEX_PATTERN = 'data-user-internal-regex-pattern';
const DATA_ATTR_REGEX_OPTIONS = 'data-user-internal-regex-options';
export const ID_USER_EXTERNAL = 'user_external';
export const ID_WARNING = 'warning_external_automatically_set';
export const ID_USER_EMAIL = 'user_email';

const getAttributeValue = (attr) => document.querySelector(`[${attr}]`)?.getAttribute(attr);

const getRegexPattern = () => getAttributeValue(DATA_ATTR_REGEX_PATTERN);

const getRegexOptions = () => getAttributeValue(DATA_ATTR_REGEX_OPTIONS);

export const setupInternalUserRegexHandler = () => {
  const regexPattern = getRegexPattern();

  if (!regexPattern) {
    return;
  }

  const regexOptions = getRegexOptions();
  const elExternal = document.getElementById(ID_USER_EXTERNAL);
  const elWarningMessage = document.getElementById(ID_WARNING);
  const elUserEmail = document.getElementById(ID_USER_EMAIL);

  const isEmailInternal = (email) => {
    const regex = new RegExp(regexPattern, regexOptions);
    return regex.test(email);
  };

  const setExternalCheckbox = (email) => {
    const isChecked = elExternal.checked;

    if (isEmailInternal(email)) {
      if (isChecked) {
        elExternal.checked = false;
        elWarningMessage.classList.remove('hidden');
      }
    } else if (!isChecked) {
      elExternal.checked = true;
      elWarningMessage.classList.add('hidden');
    }
  };

  const setupListeners = () => {
    elUserEmail.addEventListener('input', (event) => {
      setExternalCheckbox(event.target.value);
    });

    elExternal.addEventListener('change', () => {
      elWarningMessage.classList.add('hidden');
    });
  };

  setupListeners();
};