fields

We all know that Drupal provides the FormAPI, in which very powerful form elements exist (in our case, the tableselect element). This magical element behaves like a table, but has a checkbox for each line, and associated JS/CSS to handle checking rows. But it is normally impossible to add additional form elements on each row ( there have been many workarounds, but all seem hackish) due to the way Drupal handles form submission. This is how to have a clean (and simple!) way to go around those restrictions.

There are many occasions in which you would like to alter a form behavior, and it's normally very easy to do -- just implement hook_form_alter and you're done. There are cases though, where fields will be missing, and in those cases, you need a workaround.