Interactive Search Builder for javascript has been released in NuGet. ISBjs is a configurable javascript “widget” that empowers your users to build their own search queries, significantly reducing the complexity for you, the developer from providing many search options.Read more about how it works, how to make it pretty, etc. on the github page HERE.
Here is a short screencast of a Visual Studio example project, from File->New, to a working search:
contrived example 