Bitrix catalog, how to display a section and its elements on one page?

Question

1C-Bitrix

How to display sections and their elements in a catalog?
By type
-Section-
--Items--
-Section-
--Items--

As in the screenshot


, I displayed sections, but now how to link elements to sections?

Answer 1

This task is called grouping the elements in an array by section. In Bitrix exam No. 2 there is such a task in the tickets. In the news.list component, for example, in the result_modifier.php file, you process the data and form your resulting array:
1. Pull out the sections
2. Pull out the elements
3. Group the elements by section. We form our own key in which we build links section - elements, while maintaining the sorting of elements
4. In the template of the component, you form the output in the desired form.