Demo: http://mfauveau.github.io/angular-query-builder
This is a sample HTML / JavaScript application that demonstrates how to use Angular.js to create a dynamic query building web UI.
This was inspired by: https://github.com/kindohm/knockout-query-builder
Update: The conditions (optinal) and fields can be passed as attributes to the query-builder directive abd also query-config object is returned to query-json attribute.(check the updated example in index.html).