How to develop custom fields for SharePoint Online list - Lookup with Picker

Question

We have a SharePoint 2010 list where a custom field "Lookup with Picker" has been implemented through a farm solution. We need to migrate the list to SharePoint Online but since we cannot deploy farm solutions in O365 environment, is there a alternative or workaround to implement that custom field in SP Online?

Answer 1

You could use JSLink to change field render for classic view in SharePoint online.

https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/custom-field-type-sharepoint-add-in

For modern view, you need create SPFx solution.