On Tuesday, July 14, 2015 at 6:59:14 PM UTC+3, Tyler Morten wrote:
> On Tuesday, July 14, 2015 at 4:51:15 AM UTC-5, Asher Coren wrote:
> > Hello,
> > Sometimes, when building components, they depend on internal logic that the
> > entire app doesn't care about. For example: A toggle button that toggles
> > display between two fields from the app-state. The status of the toggle
> > (which of the fields is displayed) is only the concern of the toggle
> > component.
> > I know it is possible to store this local state in the local state of the
> > component, but is there a way to add it to the cursor of the component
> > without changing the app-state?
>
> I'm not an expert in Om, but I think this (toggle field state) is the perfect
> example of what to store in the local components state and not in your
> application state. I suppose if you REALLY wanted to you could store this in
> your app-state and just mutate a :selected-field...i.e.
>
> (defonce app-state (atom {:selected-field :first-field))
>
> (om/update! cursor :selected-field :first-field)
> or
> (om/update! cursor :selected-field :second-field)
>
> In the render function, you can select what field is visible via display
> helper function:
> (dom/input #js {:style (display cursor :first-field} "Field #1")
> (dom/input #js {:style (display cursor :second-field} "Field #2")
>
> (defn display [cursor field]
> (if (= (:selected-field cursor) field)
> #js {}
> #js {display: "none"}))
>
> I think this would work...is this what you were thinking?
> Tyler
Your idea for storing it permanently in the app state will work, but it doesn't
look natural to have such a local field in the app state. I'm looking for a way
to inject it in to the app state only when viewing that component.
A note about your implementation: Your `display` function is not necessary.
There's no need to add a `display` property to the field; Simply build the
required component according to the state:
(dom/input nil selected-field)
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