Hello! I'm developing an online store on ASP.NET CORE MVC. Use the site metanit. Experience development a little . When loading the main page, I can see the cards of all the goods, and about how on this page https://metanit.com/sharp/aspnet5/8.2.php
On the form I have four drop down list, the data source which - category. When I fill in all four fields and press send , everything happens normally, the filtered output of the card. I now need that when you enter data in one of the fields, there was an automatic filtering of data sources in the drop-down lists of other fields and nearby formed the "show" link and number of items. Such filters I've seen on many sites, for example https://www.1001tur.ru/
I want by clicking on the field had a list with checkboxes and I could do multiple choice of categories. And that would be when you select in one field, automatically filtered the checkboxes for the other fields.