A loading prop to components like Select as per mentioned in this comment https://github.com/palantir/blueprint/issues/2528#issuecomment-418816808
yep thanks for filing this request. will slate for Q1 2019.
Welcome @giladgray 馃槃 Selfishly, I also need this.
Nice to see this request.
Any news on this? 馃槃
Has this been implemented?
Nope, I will close the issue when it's implemented. Until then you can vote for issues by reacting to the original post.
^ Hi all I have a WIP PR on this feature. Currently have the omnibar working, will finish with other components later.
Also I used a Spinner as the default loading component. Any suggestion for a better looking option is welcome. Tks!

Most helpful comment
Nice to see this request.
Any news on this? 馃槃