If I look the chome network log I see the get request and Netsuite returns a page it seems but it doesn't actually refresh the suitelet page I'm on and doesn't seem to have the new data on the page.

1. Is the sublist already there but hidden until the date is selected? 2. How are you trying to add the sublist to the page after the date is selected?

It is not already there. When the date is selected a client script calls the suitelet again with a a parameter that the suitelet sees and adds a list.

you wouldn't use https.get to refresh the page

^, something like

var origURL = window.location.href;
var newURL //add logic to append param
location.href = newURL

That seemed to do it but it pops up with this message. Anyway to not do that? I’m trying to do something like I saved search filters where you can select date and then it refreshes the search with accurate data. It never pops up with anything like this though

usually you remove those via

window.onbeforeunload = null