consider this example:

class MyComp < React::Component::Base

render do
MyOtherComp().on(:running) { alert 'MyOtherComp is running' }
end

end

the param name in MyOtherComp needs to be named _onRunning for this to work.

React.js has the convention of naming call back props onFoo, (so it mirrors any builtin event which have names like onChange) and so we would naturally like to write .on(:foo) { ... } This doesn't work because of the addition of the "_" in front.

So if the component being called is an imported native component DONT add the _