You can only use one function with the backcall, but what you can do is use a backcall, and supply the other function normally (note the use of the _
as a placeholder to denote where the backcall function should go in the arguments) - eg.
data <- $.get '/path/to/api' .then _, -> alert "$.get failed!"
alert "$.get succeeded"
compiles to:
$.get('/path/to/api').then(function(data){
return alert("$.get succeeded");
}, function(){
return alert("$.get failed!");
});