I have a piece of code where:

[(fn [] 
               [:input {:size      "80" 
                        :value     @r-text
                        :on-change #(reset! r-text (ba.js/value-<-event %))}])]

[:input {:size      "80" 
                        :value     @r-text
                        :on-change #(reset! r-text (ba.js/value-<-event %))}]

right, but wouldn’t it be strange for an item that gets deleted and recreated to preserve focus status?

@qqq have you tried giving react a hint that you are updating a component with :key metadata or attr ?

@qqq, the problem could be that the component gets unmounted and remounted again in the first example

it's one of these corner cases ("stateful" components) where keeping a component mounted is necessary, not just for performance but also for user experience

I think this is what @mccraigmccraig is suggesting as well?

I'd first verify that this is the problem by adding logging to the component (make it a form-3 component and add did-mount and will-unmount lifecycle methods that log)

yes @pesterhazy that is what i was meaning

the other possibility is that is matters where you are dereffing the ratom

so the issue might be todo with the surrounding code - something else higher up in the comp tree gets rerendered, causing the remount

@mccraigmccraig @pesterhazy : resolved the issue ; in the end

[(fn [] ....)] // loses focus on click

(def some-component (fn [] ...))
[some-component] // works

I'm not sure why, but that's what I ended up seeing in this situation

actually wait, does this even make sense?

this seems to break some rule of substitution

It makes sense because the Anon fn gets created on every render

It's a new object reference each time

So react assumes that it's seeing a different comp

@qqq, ^^

Substitution is not broken because you're dealing with the function as an object reference, not with a simple call. Philosophically speaking the function is mentioned, not used

@pesterhazy : thanks for clarying this

this 'inconsistency' was driving me crazy and making me very uncomfortable with reagent; but all owrks well now 🙂