Cross tab communication in CoffeeScript

cross_tabs.js.coffee

event_prefix = 'cross-tabs:'

## 
# Global function allows for triggering cross browser events
@cross_tabs_trigger = (ename, msg) ->
    data = JSON.stringify(msg, null, 2) 
    localStorage.setItem(event_prefix + ename, data)

cross_tabs_handler = (e) ->
    if e.key.startsWith(event_prefix)
        console.log('received message: ' + e.key)
        msg = JSON.parse(e.newValue);
        $(document).trigger(e.key, msg)

if window.addEventListener 
    window.addEventListener "storage", cross_tabs_handler, false 
else
    # for IE
    window.attachEvent "onstorage", cross_tabs_handler

return



##
# Now in one tab:
cross_tabs_trigger('widget:new', xhr)


##
# And in the other
$(document).on 'cross-tabs:widget:new', (e, xhr) ->
    console.log('WE RECEIVED THE EVENT!!!')
    console.log(xhr)