I have this Bootstrap code which I would like to use to generate address and implement copy button functionality:
<div class="modal fade" id="bitcoinModal" role="dialog">
                    <div class="modal-dialog modal-lg">
                      <div class="modal-content">
                        <div class="container">
                            <div class="offset-top-20 text-md-left">
                              <button type="button" class="close" data-dismiss="modal">×</button>
                              <h3>Copy address</h3>
                            </div>
                            <div class="section-60 offset-top-35">
                                <div class="offset-top-20 text-md-center">
                                  <form class="rd-mailform form-inline-custom text-left" data-form-output="form-output-global" data-form-type="subscribe" method="post" action="http://.........">
                                    <div class="form-group form-group-outside">
                                      <div class="input-group">
                                        <label class="form-label form-label-outside text-dark" for="forms-subscribe-email">Bitcoin Address</label>
                                        <input class="form-control" id="forms-subscribe-email" type="text" name="bitcoin_address" value="3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy " data-constraints="@Required"/>
                                      </div>
                                      <div class="input-group-btn">
                                        <button class="btn btn-width-165 btn-primary" type="submit">Copy</button>
                                      </div>
                                    </div>
                                  </form>
                                </div>
                            </div>
                          </div>
                      </div>
                    </div>
                  </div>
              </div>
How I can copy the content from the input item and close the form when the value is copied into the clipboard?
 
    