After a while of digging I found the solution to be a combination of using
react's `initLocalState` lifecycle method and `om.next/get-state` as hinted
to in Chris' SO answer.
The general outline becomes as follows:
(defui MyComponent
Object
(initLocalState [this] {:id (gensym "") ...}) ; <-- the key
(render [this]
(let [id (om/get-state this :id)] ...))
(componentDidmount [this]
(let [id (om/get-state this :id)] ...))
...
This approach is a little more verbose than in Reagent, but yields
equivalent results. I use this all the time, so am a little surprised I
couldn't find any discussion about this elsewhere. I guess I am the only
one who didn't get it the first time :-)
Op woensdag 8 november 2017 16:20:29 UTC+1 schreef Marc Claesen:
>
> I am fairly new to cljs and very new to Om.Next so this question is
> probably trivial to answer.
>
>
> I would like to do something equivalent to Reagent form-3 components,
> which enable me to define some vars I can reuse in all lifecycle functions
> of specific instantiations of a component.
>
>
> Basically my question is how do I construct something equivalent to the
> let in the Reagent code snippet below? I can't seem to figure out how to
> do this properly using Om's defui macro.
>
>
> A simple example would be to generate ids I can attach to specific
> elements in my component to streamline access to them in all lifecycle
> functions of a specific instance of my component via gdom/getElement.
>
>
> (defn my-component
> [x y z]
> (let [id (gensym "my-component-")] ;; <-- how to do this in Om?
> (reagent/create-class
> {:component-did-mount (...)
> :component-will-mount (...)
> :reagent-render
> (fn [x y z] (...))))
>
>
> I assume an equivalent approach is possible in Om.Next, but please let me
> know if I am somehow committing a cardinal sin using this approach.
>
>
> I have also asked this question on stackoverflow
> <https://stackoverflow.com/q/47181093/2148672>.
>
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