Override List Search Box

Hi

Thank you for your response. 

I have since looked into this and unless I am missing something this is not suitable for my needs for a couple of reasons. The main one being that I need this to happen in the navigation table stage of importing my data into power BI through my custom data connector.

What I am trying to do is this: The user opens up the data connector, signs in to their account, and then in the navigation table has a list of various datasources that they have access to. Each one of these datasources contains anywhere from 100 to 160,000 items and what I want to do is allow them to select which of those items they want, without having to load in all the items at once. This works fine if you know the names of the items and can just type them in but often the names are long and obscure, hence the need to search for them. However to search for them you either need to have loaded them all in at once, not an option due to time (and to a lesser extent memory) constraints, or have a way to query my API on every keypress of the search bar, leading me to wonder if there was anyway to override the search bar listener. 

An alternate solution that I have been looking into if it is possible is to have a nested function inside the navigation table, so I could manually query the api from there and then use that response in the encompassing function to get the items I wanted.