unload.coffee | |
|---|---|
unload = do -> | |
| Initialize the array of unloaders on the first usage | unloaders = [];
return (callback, container) -> |
| Calling with no arguments runs all the unloader callbacks | if !callback
unloader() for unloader in unloaders
unloaders.length = 0 |
| The callback is bound to the lifetime of the container if we have one | else if container |
| Remove the unloader when the container unloads | container.addEventListener "unload", removeUnloader, false |
| Wrap the callback to additionally remove the unload listener | origCallback = callback
callback = ->
container.removeEventListener "unload", removeUnloader, false
origCallback() |
| Wrap the callback in a function that ignores failures | unloader = -> try callback()
unloaders.push(unloader) |
| Provide a way to remove the unloader | removeUnloader = ->
index = unloaders.indexOf unloader
if index > -1
unloaders.splice(index, 1)
return removeUnloader
|