即使'return false'运行，删除也不会停止

I have implemented the functionality to remove users from the database in my application. A user chooses user(s) (checkboxes) and clicks submit. A confirmation box is shown asking the user if he wants to delete username. Everything works except that if Cancel is clicked the user(s) still gets removed.

Why is that and how could I prevent it (I have check and return false runs)

from usercontroller.php:

if ($userView->TriedToRemoveUser()) {
  $userIds = $userView->GetUsersToRemove();

  if ($userIds != 0) {
    $removeTry = $userHandler->RemoveUser($userIds);

    if ($removeTry) {
      $xhtml = \View\UserView::USER_REMOVED;
    }
    else {
      $xhtml = \View\UserView::FAILED_TO_REMOVE_USER;
    }
  }
}

from userview.php:

public function TriedToRemoveUser() {
  if (isset($_POST[$this->_submitRemove])) {
    return true;        
      }
      else {
        return false;
      }
}

from the js.file:

$('#form3').submit(function() {
  $('input[type=checkbox]').each(function () {
    if( this.checked ) {
      var username = $(this).attr('user');

      var confirmBox = confirm('Do you really want to remove the user ' + username + ' ?');

      if (!confirmBox) {
        return false;
      }
      }
  });
});

(WARNING: All code is off the top of my head and not properly tested)

Assuming you are talking about the return false; statement in the javascript:

The return false; will not prevent the submit method as it is only breaking from the .each() method. All this will do is stop the iteration over the checkboxes.

Try something like:

$('#form3').submit(function () {
    var doDelete = true;

    $('input[type=checkbox]').each(function () {
       // ...

       if (!confirmBox) {
           doDelete = false;
           return false; // Deletion has been cancelled so there is no need to continue the iteration
       }
    });

    if (!doDelete) {
        return false;
    }
});

This will prevent the entire form from being submitted if the user cancels any of the selected users. If you're intention is to continue to submit any confirmed users you could try something like the following:

$('#form3').submit(function () {
    $('input[type=checkbox]').each(function () {
       // ...

       if (!confirmBox) {
           $(this).attr('checked', false); //Uncheck this box so that it isn't submitted
       }
    });
});

Returning false from the .each() does not stop the submit, store that value in a variable and return that variable.

$('#form3').submit(function() {
    var submit = true;
    $('input[type=checkbox]').each(function () {
        if( this.checked ) {
            var username = $(this).attr('user');

            var confirmBox = confirm('Do you really want to remove the user ' + username + ' ?');

            if (!confirmBox) {
                submit = false;
                return false;
            }
        }
    });
    return submit;
});