devicehub-teal/ereuse_devicehub/templates/inventory/addDeviceslot.html

<div class="modal fade" id="addingLotModal" tabindex="-1" style="display: none;" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">

      <div class="modal-header">
        <h5 class="modal-title">Adding to a lot</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>

      <form action="{{ url_for('inventory.devices.lot_devices_add') }}" method="post">
      {{ form_lot_device.csrf_token }}
        <div class="modal-body">
          Please write a name of a lot
          <select class="form-control selectpicker" id="selectLot" name="lot" data-live-search="true">
            {% for lot in lots %}
            <option value="{{ lot.id }}">{{ lot.name }}</option>
            {% endfor %}
          </select>
          <input class="devicesList" type="hidden" name="devices" />
          <p class="text-danger">
              You need select first some device for adding this in a lot
          </p>
        </div>

        <div class="modal-footer">
          <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
          <input type="submit" class="btn btn-primary" style="display: none;" value="Save changes" />
        </div>
      </form>

    </div>
  </div>
</div>