XMLHttpRequest "DELETE" call to the flask backend. No jquery is required.

frontend.html

<button id="deleteDevice" class="btn btn-danger btn-xs"
        data-link="{{ url_for('monitor.delete_device', id_device=device.id_device) }}">
    <span class="glyphicon glyphicon-remove-circle"></span>
    Delete Device
</button>

<script type="text/javascript">
  var t = document.getElementById('deleteDevice');
  t.addEventListener('click', function () {
      deleteDevice(t.dataset.link);
  });

  function deleteDevice(url) {
      var xhr = new XMLHttpRequest();
      xhr.open("DELETE", url, true);
      xhr.onload = function (e) {
          if (xhr.readyState === 4) {
              if (xhr.status === 200) {
                  window.location.assign('{{ url_for('monitor.index') }}');
                  console.log(xhr.responseText);
              } else {
                  console.error(xhr.statusText);
              }
          }
      };
      xhr.onerror = function (e) {
          console.error(xhr.statusText);
      };
      xhr.send(null);
  }
</script>

views.py

# Flask backend

@mod.route('/<string:id_device>')
@mod.route('/<string:id_device>', methods=['DELETE'])
@login_required
def view_device(id_device):
    """
    View a single device and delete a single device
    """
    if request.method == 'DELETE':
        Devices.query.filter_by(id_device=id_device).delete()
        db.session.commit()
        # if id_device not in Device.query.filter_by(id_device=id_device).first():
        flash('Device %s has successfully been deleted.' % id_device, 'success')
        return ""

    # else ... 
    return render_template(...)