Is it possible to send multiple messages on one event using elm-html? -


i send 2 messages distinct adresses on 1 event. particular case encountered had popup , when user clicks "add" to:

  • close popup (message send popup component)
  • inform parent component item should added (message send parent component)

onclick has following type "address -> -> attribute" there seems no possibility that. on other hand seems such pattern (one action resulting in multiple message) met in practice.

for resorted sending 1 message informing parent item added , parent in update function updates popup hide action. 

addbutton = button [onclick context.addtaskaddress model.taskdescription] [text "add"]

and in parent's component update function

popup = addtaskpopup.update addtaskpopup.hide model.popup

you set intermediate proxy mailbox takes list of address , message pairs, call button click.

proxy : mailbox (list (address a, a)) proxy =   mailbox []

then have broadcast signal listens proxy mailbox , creates bunch of signal.send tasks notify other addresses.

port broadcast : signal (task x (list ())) port broadcast =   let     tasks = list.map (uncurry signal.send)   in     signal.map (task.sequence << tasks) proxy.signal

your onclick code this, pass in list of address , action pairs:

onclick proxy.address [(address, action1), (address, action2)]

note in above code, address refers address coming view function, whereas proxy.address refers proxy mailbox set up.

this general purpose solution work number of signals.


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