All good - phew. Thanks Peter!
So it turns out the urlParser you hand to Navigation.program gets invoked
on the initial URL before the call to init happens, and the output of
urlParser feed into init. This was not obvious to me from the
documentation nor the examples I found, which are more about setting the
URL or responding to URL monkeying.
Here is the skeleton of how to do it, for anyone interested.
--bill
import Navigation
-- Test program to extract the deal value from a URL like:
-- deepfinesse.com/demo.html?deal=AQ752.KJ.843.T96
-- Model will hold the deal (eg) "AQ752.KJ.843.T96"
type alias Model = String
-- Our urlUpdate is a NO-OP as we don't care to change the URL nor respond
to URL monkeying
main =
Navigation.program urlParser
{ init = init
, view = view
, update = update
, urlUpdate = (\_ model -> (model, Cmd.none))
, subscriptions = subscriptions
}
-- locRec is provided by the system and locRec.search looks like
"?deal=AQ752.KJ.843.T96"
urlParser : Navigation.Parser String
urlParser =
let
-- define our parsing function
extractDealFromUrl locRec =
String.dropLeft 6 locRec.search
in
Navigation.makeParser extractDealFromUrl
-- The system calls urlParser on the initial URL and passes the result to
init
init : String -> (Model, Cmd Msg)
init dealFromUrl =
(dealFromUrl, Cmd.none)
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