[ClojureScript] Re: Again re-frame and external javascript lib needing db state
On Sunday, March 15, 2015 at 4:30:35 AM UTC+11, Sven Richter wrote:
Hi,
I am still trying to integrate resumable.js. Got it mostly working so far.
What I currenlty do is this. Define a global resumable object:
(defonce resumable (js/Resumable. (clj-js {:target /files/upload
:headers {:X-CSRF-Token
(h/get-value glob_anti_forgery)}
:query {:g-uuid #()}})))
And here we see the problem already. If I want to provide additional query
parameters for the POST of resumable.js. You can do this with the :query key
value pair.
I want to provide some parameter depending on user input, so this will change
after the construction of the resumable object. And the change will reside
inside the db, which I cannot access from the outside as far as I can tell,
but only via register-handler and register-sub.
Did someone already solve a similar problem?
The only thing that comes to my mind is global js state, which would be an
anti-pattern to re-frame I guess.
Best Regards,
Sven
I'm not familiar with js/Resumable, but the doc says query can be a function.
In which case, make it a function which reads a value out of app-db (which was
put there via event handlers and user interaction)?
--
Mike
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[ClojureScript] Re: ANN: re-frame v0.2.0 - an FRP MVC pattern for writing SPAs in Reagent. (Woah, so many LTAs!!)
On Saturday, March 14, 2015 at 2:52:45 PM UTC+11, AndyR wrote: On Friday, March 6, 2015 at 11:28:59 PM UTC-5, Mike Thompson wrote: re-frame is a pattern for writing SPAs, using Reagent. https://github.com/Day8/re-frame [...] - pushes Reagent's FRP capabilities (via use of reaction) The magic thing about a reaction is that the computation it wraps will be automatically re-run whenever 'its inputs' change, producing a new output (return) value. What if I have a heavy computation in there and I don't actually display that value right now in my app. Will it still be computed? Or is that something to take special care of? So only lightweight computations in reactions? If that's the case, would it make sense to also create a lazy reaction that only get's realized/computed when it's deref'ed? reactions are only ever used in subscriptions, which are the query layer of re-frame. They do not create new data. Instead, their job is to reactively supply views (queries) across existing data (in app-db, the single source of truth ratom). The CPU intensive calculation of new values happen in event handlers, using this sort of a pattern: https://github.com/Day8/re-frame/wiki/Solve-the-CPU-hog-problem Clarification: sometimes a query delivers derived data (a kind of materialised view) which DOES involves CPU intensive work. For example, a query might involve sorting a collection of items and finding the top 20 items (so they can be displayed in the view). That's something that would happen inside a reaction. But in this case there's no new data being created (the collection of items doesn't change), just a derived version of that data is being created for view purposes. Regarding lazy calculation: you can certainly do that. You'd wait for the right trigger to perform the calculation - but the calculation would happen in an event handler. Only event handlers can update app-db (providing new data to the application). -- Mike -- Mike -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups ClojureScript group. To unsubscribe from this group and stop receiving emails from it, send an email to clojurescript+unsubscr...@googlegroups.com. To post to this group, send email to clojurescript@googlegroups.com. Visit this group at http://groups.google.com/group/clojurescript.
[ClojureScript] Again re-frame and external javascript lib needing db state
Hi,
I am still trying to integrate resumable.js. Got it mostly working so far.
What I currenlty do is this. Define a global resumable object:
(defonce resumable (js/Resumable. (clj-js {:target /files/upload
:headers {:X-CSRF-Token
(h/get-value glob_anti_forgery)}
:query {:g-uuid #()}})))
And here we see the problem already. If I want to provide additional query
parameters for the POST of resumable.js. You can do this with the :query key
value pair.
I want to provide some parameter depending on user input, so this will change
after the construction of the resumable object. And the change will reside
inside the db, which I cannot access from the outside as far as I can tell, but
only via register-handler and register-sub.
Did someone already solve a similar problem?
The only thing that comes to my mind is global js state, which would be an
anti-pattern to re-frame I guess.
Best Regards,
Sven
--
Note that posts from new members are moderated - please be patient with your
first post.
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