document.addEventListener('readystatechange', function (state) {
    if (state.target.readyState === 'interactive') {
        let emailField = document.querySelector('input[name="Mail"]');
        if (typeof emailField !== 'undefined' && emailField !== null) {
            emailField.value = '<?php echo $user["email"] ?>';
            emailField.disabled = 'disabled';
        }
        let kndNameField = document.querySelector('input[name="KDName"]');
        if (typeof kndNameField !== 'undefined' && kndNameField !== null) {
            kndNameField.value = '<?php echo $user["realname"] ?>';
            kndNameField.disabled = 'disabled';
        }
    }
});