{{ form_ajax(__SELF__ ~ '::onAddItem', {
    update: "'" ~ __SELF__ ~ "::list': '#result'",
    success: "$('#input-item').val('')",
    'data-request-flash': ''
}) }}
    <div class="panel panel-default">
        <div class="panel-heading">
            <h3 class="panel-title">To Do List</h3>
        </div>
        <div class="panel-body">
            <div class="input-group">
                <input type="text" id="input-item" class="form-control" value="" name="newItem" placeholder="What needs to be done?">
                <span class="input-group-btn">
                    <button type="submit" class="btn btn btn-primary" data-attach-loading>Add</button>
                </span>
            </div>
        </div>
        <ul class="list-group" id="result">
        </ul>
    </div>
{{ form_close() }}