Also no support to #js {5 55}... Is it intentional?

Is there a way to get response status out of cljs-ajax? I can't figure out how to get anything more than [[ok response]] which is just a true/false flag. The response object is just the body, not the whole response. Anyway to get the whole response instead?

anyone here use sente for websockets? ()

I have a security concern but I'm too much of a clojure noob to entirely understand this aspect of it

;; server
(defmethod -event-msg-handler
  :default ; Default/fallback case (no other matching handler)
  [{:as ev-msg :keys [event id ?data ring-req ?reply-fn send-fn]}]
  (let [session (:session ring-req)
        uid     (:uid     session)]
    (debugf "Unhandled event0: %s" event)
    (when ?reply-fn
      (?reply-fn {:umatched-event-as-echoed-from-from-server event}))))  ;; <---- this is the part that concerns me (see below)

;; client
(when-let [target-el (.getElementById js/document "btn2")]
  (.addEventListener target-el "click"
    (fn [ev]
      (->output! "Button 2 was clicked (will receive reply from server)")
      (chsk-send!
        [:example/button2 {:had-a-callback? "indeed"}]
        5000
        (fn [cb-reply]   ;; <---- it looks like this function is being sent to server to be executed as ?reply-fn
          (->output! "Callback reply: %s" cb-reply))))))

I'm sure there's something I don't understand but it looks as if arbitrary code is being sent to be executed on the server...

@goomba: the code is not sent for execution on the server. all the ?reply-fn will do when called is send its arguments to the client for execution there

:thinking_face:

you can try writing a callback that is not even valid clojure (only valid clojurescript)

ok so in this case

or writing one that modifies the DOM, prints to the browser console, or does anything else that doesn't make sense in the server side

that should crash if the server tried to execute it

?reply-fn is sending back to the client {:umatched-event-as-echoed-from-from-server event} which is executed by the anonymous function

(fn [cb-reply]
          (->output! "Callback reply: %s" cb-reply))

okay... that makes sense with the behavior I'm seeing, thank you

exactly, and cb-reply is the dict that the server has sent

(the mapping even)

I see... THANK you

you're welcome. sente is awesome!

I was gonna 😭 if I couldn't use this! Yes, sente is awesome!!!

If somebody has a minute to take a look please 😉 https://stackoverflow.com/questions/45003533/how-to-use-bignumber-js-with-clojurescripts-npm-deps-feature

@madvas just looks like the module is written in a format that Closure can’t understand

yeah, thought it’ll something like that 😕 nevermind, thanks for reply 😉

what is the cljs way to have a function that is: 1. called once every 100 ms 2. across different reloads (via figwheel / boot-reload), don't have the function end up being called too much

i.e. avoid "every reload = additional timer callikng the function once every 100 ms"

@qqq

(defonce interval
  (js/setInterval (fn [] ...) 100))

okay, so I have an XY problem

suppose we have: (defn reactive-timer-new [] ... )

it'll look something like:

(defn r-timer-new []
  (let [r (r-atom (js/Date.))
        update (fn []
                 (reset! r (js/Date.)))]
    (js/setInterval update 100)))

now, when I no loger need this timer reactive atom

(r-atom is reagent/atom)

the problem is: (1) this can't get gc-ed since there is a js/setInterval referencing it)

is there a way to get around this problem?

js/clearInterval?

[it's a bit different from the original qu3estin . asked; but across reloads, I may end up creating ew timers ]

actually, you win, I'm going to defonce one global "now" reagent/atom

Is there a way to do native await in clojurescript?

@skammer No but there is: https://funcool.github.io/promesa/latest/#async-await-syntax

@rauh @skapadia afaik they use core.async under the hood, one should be aware that it produces a lot of code

promesa requires you to do p/await inside p/alet, which, in some sense, defeats it’s purpose 😞

@skammer you could use js* macro to implement something like this i cljs

(defmacro async [body]
  `(js* "(async function() {~{}})();" ~body))

(defmacro await [expr]
  `(js* "await ~{}" ~expr))

(async
  (let [a (await 1)
        b (await 2)]
    (+ a b)))

but I’m not sure if this is safe

@skammer yeah, this wouldn’t JUST work. for example let bindings is being wrapped into IIFE which also have to by async function in order to be able to use await inside of it

in any case, unless you are targeting browsers that have native support for async/await, there’s not much benefit since both core.async and transpiled async/await produce a lot of code

I’m targeting nodejs, so even large amount of generated code isn’t really an issue here

@skammer In that case I'd def take another look at promesa, bluebird is faster than native async/await.

I'm trying to flip the state of an item in an atom, but I cant get it to work

(defn todo-item [{:keys [title done]}]
  [:li (done? done) " - " title
   [:a {:on-click #(reset! not :done)} done]])

I think I'm not using the reset function correctly

@shidima_ Use

swap!

reset!

(swap! state #(assoc % :done (not (:done %))))

thanks @ruben will check it out

or more concisely (swap! state update :done not)

hi, here

Hello developers. I'm new to the ClojureScript language, and it's a pleasure to be yours.

@yvon welcome!

I am currently learning to create mobile apps using clojurescript, react-native and I would add a toobar in my app. help please

Thank you @dnolen

335/5000 I would like to create a registration form with

ClojureScript

React-Native

Reagent

I just want to create a simple registration form, using ClojureScript MaterialDesign ReactNative.

Thanks in advance for your feedback.

Name

Your Name

Your Email

Enter your password

@dzita there is a #cljsrn channel for React Native questions

@yvon you also probably want to checkout the React Native channel

Hi all, How can I pass a function as an argument as follows: I need a button component with the ability to add or subtract from a value so would like to have (defn MyBtn [operator] [:button {on-click (operator valA valB)} str opertor]) and call it as [MyBtn +] or [MyBtn -] etc. Hope that makes sense! Thx!

@fedreg {:on-click (fn [event] (operator valA valB)}} is what you want for the handler

@dnolen Thx! My example wasn’t the best. I had the fn [e] part but was calling the operator incorrectly within my swap! function. Got it though. Thx again!

re: async/await support, I’m curious as to why people want this … why not just patch Promises to be channels?

one reason may be to be able to translate async/await library examples to clojurescript: https://github.com/zeit/micro#async--await

is there a js to cljs translation tool somewhere?

@devth I wanted that many times, even a stupid one

yeah. 😕

i guess all the mutability in js makes that hard

shouldn’t be hard to print a JavaScript AST to ClojureScript

but.. ^ famous last words, right?

often need to grab a snippet from somewhere and translate. e.g. https://github.com/GoogleCloudPlatform/stackdriver-errors-js#initialization

this might help with translating js async/await examples - http://funcool.github.io/promesa/latest/#async-await-syntax

would be a great web service, like http://htmltohiccup.herokuapp.com/

Any reviews for this book? Half off for DRM day and just wondering if anyone has experience with it https://www.packtpub.com/web-development/learning-clojurescript

Hey everyone, I’m trying to follow along with the modern-cljs tutorials but I’m running into issues with boot-cljs-repl

boot.user=> (start-repl)
<< started Weasel server on ws://127.0.0.1:50549 >>
<< waiting for client to connect ... Connection is 
Writing boot_cljs_repl.cljs...

did you open the page in the browser?

do you see any errors in the dev console?

none, it prints out “Hello, World!” just like it should

It also shows that Connection is ws://... instantly even if i don’t have localhost:3000 open

can you verify if the browser connects via websocket?

I don’t think it is… i see no indication that it is other than the repl output

you may need to add code to that effect, maybe you skipped over that part of the tutorial?

ah wait boot-cljs ads that

try shift-reloading the browser

that did it

weird

I guess it just cached the old version?

anyway thanks a bunch @pesterhazy

sure thing

@benbot you probably use Chrome? Then you ran into this recent change in how Chrome caches javascript files when you click Reload: https://blog.chromium.org/2017/01/reload-reloaded-faster-and-leaner-page_26.html

> relatively minor change

good to know 🙂

Chrome essentially caches js files served without Cache headers forever, even if you click reload.

Reloading is faster if you don't actually reload anything.

Hi everyone, I have a question and I would like to know if anyone here can help me. What is the best way to via spec using date and time fields.. I’m using this way:

(s/def :model.shift/initial-date #(instance? goog.date.UtcDateTime %))
(s/def :model.shift/start-time #(instance? goog.date.DateTime %))
(s/def :model.shift/end-time #(instance? goog.date.DateTime %))

So I am new to macros and found a nice use case for one, however, I don't think it's quite right. My goal is to be able thread js/requestAnimationFrame through a list of functions. This is my macro:

(defmacro do-raf
[& functions]
  (list (reduce (fn [val# item#]
                  (list `fn `[] item# (list `js/requestAnimationFrame val#)))
                `(fn [])
                (reverse functions))))

(macroexpand '(do-raf
                                       (aset _element "style" "opacity" 0)
                                       (add-class! _element "set-html-transition")
                                       (aset _element "style" "opacity" 1)))
((clojure.core/fn []
            (aset _element "style" "opacity" 0) 
            (js/requestAnimationFrame 
             (clojure.core/fn [] 
               (add-class! _element "set-html-transition") 
               (js/requestAnimationFrame 
                (clojure.core/fn [] 
                  (aset _element "style" "opacity" 1) 
                  (js/requestAnimationFrame (clojure.core/fn []))))))))

isn't there an extra parenthesis around the whole thing?

No. The reduce produces a fn so I have to call it.

Oh so I figured it out... Had to use the correct syntax for macros in a namespace desclaration

man I have problems and I've tried slack and IRC and nobody even answers ever

I have an om.next app going and I am trying to introduce some ready-made components, namely bootstrap by am using racehub/om-bootstrap

and as soon as I introduce that, it breaks the whole project

I've tried #clojurescript IRC, #om.next slack, #om slack and nothing

nobody speaks for hours

when I go to #rust IRC I get at least an attempt at answer in 5 minutes

If I had some experience in om.next I'd help you ;c

Well I tried adding dependecy [racehub/om-bootstrap "0.6.1"]

and then I replaced om.dom/button with om-bootstrap.button/button

and I get the following console errors: Uncaught TypeError: Cannot read property 'prototype' of undefined

at core.cljs and at schema.cljs and at mixins.js and at util.cljs and at button.js

5 files, same error

just wondering if anyone has any om.next project using om-bootstrap on github to demonstrate proper use

First sneak preview post on the next major release - https://clojurescript.org/news/2017-07-10-code-splitting

is there some sort of schemata + cljs problem going on that I'm not aware of

@roklenarcic I have no experience with om-bootstrap myself, but I find github search to be quite good to find examples on how to use something. See: https://github.com/search?l=Clojure&q=racehub%2Fom-bootstrap&type=Code&utf8=✓

0 hits on code?

https://github.com/search?l=Clojure&q=racehub%2Fom-bootstrap&type=Code&utf8=%E2%9C%93