Add field in custom component by click

[voron121]

Hi! Sorry, maybe it's offtop, but i can't find topic with my peoblem.
So, i try create custoom component for admin panel. On edite page for item i want add fields (input for string data) when user click on button. User cliked - added new field. And when we save the item in db table all this fields shud be saved like json.

I can't find any examples or articles in oficial documentations about this (i know how render field from xml for component but huw add this field by mouse click no).

Can somebody help me ? Any informations ?

[pe7er]

Welcome to Joomla forum!

You can find some coding examples for saving forms here:
https://docs.joomla.org/Basic_form_guide

To save an array of strings into one fields as json, you could use json_encode to convert the array to json.