input with confirm JS

gistfile1.txt

<input 
  type="submit"                                                               // 'submit' type is necessary because this request is handling by OnPost handler  
  value="Delete"                                                              // text value for button 
  class="btn btn-danger form-control"                                         // bootstrap classes
  onclick="return confirm('Are you sure you want to delete this?')"           // confirm JS code 
/>