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

<div class="modal fade" id="addingTagModal" 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 tag</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>

      <form action="{{ url_for('inventory.tag_devices_add') }}" method="post">
      {{ form_tag_device.csrf_token }}
        <div class="modal-body">
          Please write a name of a tag
          <select class="form-control selectpicker" id="selectTag" name="tag" data-live-search="true">
            {% for tag in tags %}
            <option value="{{ tag.id }}">{{ tag.id }}</option>
            {% endfor %}
          </select>
          <input class="devicesList" type="hidden" name="device" />
          <p class="text-danger pol">
              You need select first one device and only one for add this in a tag
          </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>