Jak ze <select> získat ID do editoru

<select id="users" class="form-control users">
                                <option data-post="{$setting['description']}" data-user="null">Hlavní board</option>
                                <option n:foreach="$members AS $member" data-post="{$member->board}" data-user="{$member->user_id}">{$member->name}</option>
                            </select>

 <textarea id="board-content" name="description" rows="20" cols="200">{$setting['description']}</textarea>
 <button id="saveButton" class="btn btn-success ajax">Uložit board</button>

 <script> $(function() {
            $('.users').change(function() {
                var text = $(this).find('option:selected').attr('data-post');
                var id_board = $(this).find('option:selected').attr('data-user');
                var editor = new FroalaEditor('#board-content', { saveParams: { id: id_board } });
                editor.html.set(text);
            });
            var editor = new FroalaEditor('#board-content', {
            imageUploadURL: {plink Settings:uploadImages},
            language: 'cs',
            height: 500,
            // Change save interval (time in miliseconds).
           // saveInterval: 700,
            // Set the save param.
            saveParam: 'description',
            // Set the save URL.
           saveURL: {plink Settings:autoSave},
            // HTTP request type.
            saveMethod: 'POST',
            // Additional save params.
            saveParams: { id: ZDE ZÍSKAT ID}
        });
            //console.log(document.querySelector('[data-save-id]').getAttribute("data-save-id"));
            document.querySelector('#saveButton').addEventListener("click", function () {
                flashMessage('Uloženo','success');
                editor.save.save();
            })
        });
    </script>