How to intercept form data on the 1C Bitrix website using js?

Question

JavaScript

There is a site on 1C Bitrix. Developed by a certain company, with its own custom infoblocks, where requests from the site fall.
For some reason, I cannot receive data from this infoblock.
I need to somehow embed a js form handler into the page template (catch not only site field data, but also cookies).
Please tell me how and where can I insert js code on a 1C site?

Answer 1

JS code that will collect data, connect to the site template. It is usually located in /local/templates/TemplateName/
There will be header.php and footer.php files in any of them add your script connection.
Well, the script is the simplest - it just works on $('form').onsubmit, collects field values ​​and sends you along with cookies.