Refresh dropdown control

I have a page where there are 2 dropdowns that are getting populated through REST on page load. When user selects value from one dropdown, I want to refresh the second dropdown (not the whole page) . Can someone help how to do this? I am using autocomplete multiselect widget.
1 answers

You might wanna use an on change microflow to populate the other dropdown. I assume you want to changes the populated values based on the selection in the first microflow.  

And don't use a refresh function if you don't want to reload the entire page.