var _a = form.find('input[name=active_milestone_' + idx + ']');

        $(_a).attr('name', 'active_milestone_' + (idx + 1 ));

        $(_a).prop('checked', true);

    }

    $(tgt).append(form);

  });

                  </div>

                  <div class="col-sm-1 p-r-0" >

                      <input type="checkbox" name="active_milestone_{{ loop.index

                      %} checked{% endif %} />

                  </div>

                </div>

            {% endfor %}

            </div>

            <div class="row p-t-1">

                <a href="javascript:void(0)" class="btn btn-outline-primary btn-sm btn-block extend-form mt-1"

                  data-target="#milestones">

                    <i class="fa fa-plus"></i> Add new milestone

                </a>

              </div>

            </div>

            <div class="row p-t-1">

              <div class="col-sm-12">

                          data-stone="1"></span>

                  </div>

                  <div class="col-sm-1 p-r-0" >

                  </div>

                </div>''', output_text)

                          data-stone="1"></span>

                  </div>

                  <div class="col-sm-1 p-r-0" >

                  </div>

                </div>''', output.get_data(as_text=True))