How to make an application for Bitrix24 (js + jquery)?

Question

Bitrix24

You need to make a small application for Bitrix 24. In a simplified version, it will be:
1. An additional text field in CRM -> Deals
2. A pop-up window with data arriving via $.ajax. Well, let this be a list of values.
3. When you click on a value in the list, you need to copy it into a text field Can you tell me the
basic structure of the index.html file and methods for working with jquery in the context of B24?

Answer 1

First: will it be a circulation solution or for one user? It's not entirely clear how you want to use it (in the Bitrix interface, or as a separate application in Bitrix)
In general, the Bitrix24 application is just opening an iframe via a link. Those. you place a script/page with an application on your hosting and Bitrix pulls it up by the link, as if you opened this page in a browser. There are examples of applications in the documentation, take it, try it, figure it out)
1. It is added through CRM - settings - product properties. Or via api https://dev.1c-bitrix.ru/rest_help/crm/cdeals/crm_...
2. You work with jquery as usual, nothing special. But getting Bitrix dom elements via jquery will not work if there is no box.
3. It's not entirely clear what you want