API page: https://api.drupal.org/api/drupal/includes%21form.inc/function/theme_tab...
Enter a descriptive title (above) relating to function theme_tableselect, then describe the problem you have found:
Please take a look at official examples of usage theme_tableselect() and this line of function
foreach (element_children($element) as $key) {
it will have 0 iterations, because element_children($element) will be always empty array.
So $rows will also be empty. Examples will always produce table with no rows
Closed: won't fix
API documentation files
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
This is for the Drupal 7 Form API reference. Since Drupal 7 is past end-of-life this is now a "won't fix".
Work on documentation for form elements for supported versions of Drupal is at
📌
[meta] Move/Create Form Element Documentation
Active
and
🌱
[Meta] Improve documentation for Render and Form Elements
Active
.