[elm-discuss] Re: Call of init function behaviour

[Oliver Dunkl]

Thank you for your reply. I have solved my problem after looking hours and 
hours on my code :) The problem was that I had a button that calls to the 
backend which I described in my question and the problem was that the 
button was in a Html.form. Apparently it will first trigger the action and 
than reloads the page and triggers the init function again.

So Nicholas we had the right answer independently.

Sorry for the noise but maybe I could help other people with the answer :)

thx
\= odi

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[elm-discuss] Call of init function behaviour

[Oliver Dunkl]

When will the init function call? 

I have a strange (for me) behaviour in my flow. I have a backend call
in which some entity will be saved. I have a page redirect logic e.g.:

type alias Model
  { page : Int
  }

view model =
  case model.page of
0 -> viewA
1 -> viewB
  ...

In my 'update' function I will set this pages:

init : (Model, Cmd Action)
init =
  let model = Model 0
  in (model, Cmd.batch [])

update action model =
  case action of
ActionA -> model ! [ saveEntity ]
SaveE (Err _) -> model ! []
SaveE (Ok _) -> { model | page = 1 } ! []

I have a button which triggers ActionA and this sends a backend-call. So
sometimes it works as expected and sometimes the whole page will be
reloaded after SaveE (Ok _) and the init function will be called and my 
model is
initialized with the starting values.

The backend gets some values and saves the entity in the db. This
works fine with a curl-call.

So my question is, is there a trigger which reloads the page and calls
the init function? And has someone an idea why the init function will 
called in the 
middle of a flow?

My problem is it seems that this happens randomly and I have currently
no idea where the problem comes from.

thx
\= odi

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[elm-discuss] Randomly call init function

[Oliver Dunkl]

I have a strange (for me) behaviour in my flow. I have a backend call
in which some entity will be saved. I have a page redirect logic e.g.:

type alias Model
  { page : Int
  }

view model =
  case model.page of
0 -> viewA
1 -> viewB
  ...

In my 'update' function I will set this pages:

update action model =
  case action of
ActionA -> { model | page = 0 } ! [ saveEntity ]
SaveE (Err _) -> model ! []
SaveE (Ok _) -> { model | page = 1 } ! []

I have a button which triggers ActionA and this shows the viewB. So
sometimes it works as expected and sometimes the whole page will be
reloaded and the init function will be called and my model is
initialized with the starting values.

The backend gets some values and saves the entity in the db. This
works fine with a curl-call.

So my question is, is there a trigger which reloads the page and calls
the init function?

My problem is it seems that this happens randomly and I have currently
no idea where the problem comes from.

thx
\= odi

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