Is there an open source JS library for keyboard bindings in a browser?

Keymaster

A simple micro-library for identifying and dispatching keyboard shortcuts. It has no dependencies.

// define short of 'a'
key('a', function(){ alert('you pressed a!') });

// returning false stops the event and prevents default browser events
key('ctrl+r', function(){ alert('stopped reload!'); return false });

// multiple shortcuts that do the same thing
key('⌘+r, ctrl+r', function(){ });