The close button works fine while the submit button does not trigger the routine at all.
$("#incluirItensNoGrid").on('click', function(){
alert("Hello World!");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><divclass="modal-footer d-flex justify-content-center">
<button
class="btn btn-success"
id="incluirItensNoGrid()">Enviar
</button>
<button
class="btn btn-danger"
class="close"
data-dismiss="modal"
aria-label="Close">Cancelar
</button>
</div>