Feature Request: handler for when `activeIndex` changes

Is it possible to add a handler for when the activeIndex changes?

I think ideally it would have arguments for the next index and the option value for that index.

[petervojtek]

I have following use case – when user did mouseover over an item in dropdown, the item is previewed in our app (the item is not fully selected, just sort of previewed). We would like to achieve the same preview feature when user is using up/down keys to move along the dropdown items… it seems like being able to observe activeIndex would help us to achieve this goal. our intention is to keep the drodown menu as is, thus I am not sure if

using the renderMenu hook to have complete control over the look and feel of the menu and menu items

is what we actually need.

[ericgio]

This sounds like highly specific behavior. I’d recommend using the renderMenu hook to have complete control over the look and feel of the menu and menu items. You can either use the provided MenuItem component or wrap your own with menuItemContainer. The container provides an active prop that you can use for your purposes.

Example: http://ericgio.github.io/react-bootstrap-typeahead/#rendering