Can you add a 'select all' option to a webform_select_options_list? I have a webform that collects a list of flagged items. I'd like to add a "select all" option, because the list can get fairly long (50+) selections, and it can be tedious to manually check the boxes.

I'm using webform with views, sessions, and custom webform_select_options_info function.

Any ideas?
The Checkall module enables this functionality for any checkboxes form element.


  This module provides an extension to the builtin checkboxes element
  that allows developers add "check all" / "toggle" / "uncheck all"
  actions to them. This is specially useful for checkboxes that have a
  lot of elements.


A hook_form_alter() on your webform with this module should get you there.