Clojurians Log v2

Is there something that behaves like agent in clojurescript ?

I'd like to port my clojure library to cljs but it uses agent because it needs their asynchronicity

Or I guess I can use reader conditionals to use an atom when using cljs and an agent when using clojure

According to the https://clojurescript.org/about/differences#_concurrent_programming “Agents are currently not implemented”.

javascript is single-threaded so agent would just act like atoms

I know, hence my question 😛

Makes sense, thank you

not exactly, e.g for nested updates the ordering of operations in not the same

fair engough 😅

Hello. I am trying to open a file dialog box. I tried the following code without any results. (.. js/document (getElementById "file-upload") click) When I tried running `document.getElementById("file-upload").click()` the dialog opened. Could you suggest a fix?

there are limits in what the browser lets you do. for security reasons certain things are only allowed when actually triggered by a user event and so on. you can't just randomly open a dialog box like that, browser will block or just ignore the request. trying to do that in the browser console may bypass those restrictions.

Hey Guys, I'm kind of stuck with the same problem for weeks now. I'm pretty sure the solution is quite simple but I didn't get it on my own. So here's the problem: I have a text input field with a value. The value is within a nested atom so it's mutable, in theory 😉...   With a simple atom it's working, but not with a nested one.  At first I can't change the value in the input field and second if I choose for an input field without value I can change it but the output doesn't change. That's the code:

(defn inputPage [title rNames rSizes rCost url]
    (let [room-property (r/atom {:title title
                                 :name rNames
                                 :Size rSizes
                                 :Costs rCost
                                 :img-scr url})]
      (if-not (blank? rNames)
        [:div {:class "inputLine"}
         [:img {:src url :class "roomImg"}]
         [:LineContainer
          [:TextLine [:p {:class "headLine"} [:b rNames " " ]  [:comment "(" (zeroDec (* rCost dd-costKey))" €/qm)"]]
           [:p {:class "roomLine"}   (:Size @room-property) " qm, " [:class {:class "result"} [:u "Summe: " (zeroDec (* rCost dd-costKey rSizes))" €"]]]]
          ]

         [:span
          [:b rNames " " ]
          [:input {:type "text"
                   :name :Size
                   :value (:Size @room-property)
                   :on-change #(reset! [room-property :Size] (-> % .-target .-value))}]
          [:p {:id "eOutputCell" } (:Size @room-property) ]]]

     

        ))

  )

(defn atom-input [value]
  [:input {:type "text"
           :value (:Size @value)
           :on-change #(swap! value assoc :Size (.. % -target -value))}]
  )




(defn inputPage [title rNames rSizes rCost url]
    (let [room-property (r/atom {:title title
                                 :name rNames
                                 :Size rSizes
                                 :Costs rCost
                                 :img-scr url})]
      (if-not (blank? rNames)
        (fn []
          [:div {:class "inputLine"}
           [:img {:src url :class "roomImg"}]
           [:LineContainer
            [:TextLine [:p {:class "headLine"} [:b rNames " " ]  [:comment "(" (zeroDec (* rCost dd-costKey))" /qm)"]]
             [:p {:class "roomLine"}   (:Size @room-property) " qm, " [:class {:class "result"} [:u "Summe: " (zeroDec (* rCost dd-costKey rSizes))" "]]]]
            ]

           [:span
            [:b rNames ": " ]
            [atom-input room-property]
            [:p {:id "eOutputCell" } (:Size @room-property) ]]])


        [:div {:class "inputLine"
               :onClick #(testPage rSizes) }
         [:plus]]

        ))

  )

#(reset! [room-property :Size] (-> % .-target .-value)) is not valid. you are calling reset! on the vector. you want to use swap! and assoc

The interesting thing is that the on-click event handler is called, but the dialog is not displayed. My use case is the following: I am in tab A, when I click a button in A I have to navigate to B and click a button which opens the file dialog. Maybe a way to do it would be to navigate to B but open the dialog before navigation from A

Thanks I will try it. But what is the reason I can't change the input field? There must be anything totally wrong. 😞

yeah browser restrictions are weird in some cases. I can't remember the exact rules either but my guess would be that is the cause of your issue.

it keeps the current value because you :on-change fails, see https://reactjs.org/docs/forms.html#controlled-components

Ok nice thanks for the explanation and the link. I'm not aware that there are dependencies between.

you can also do uncontrolled components https://reactjs.org/docs/uncontrolled-components.html

also, shouldn't that component return a function? otherwise the atom is re-initialized every time the arguments change? (disclaimer: I haven't done cljs in ages)

that too probably

thanks for your help

😂I have absolutely no idea what you guys are talking about. I'm an absolute beginner but I will work through the links and hopefully I will understand your remarks after that. Thank you so much

it might also be a good idea to check out the reagent documentation, e.g. https://github.com/reagent-project/reagent/blob/master/doc/CreatingReagentComponents.md

👍

Where in the CLJS tests can I find the unit tests for JS interop like (.- ...), (.. ...) and (js/foo.bar ..) etc?

oh boy do I feel dumb. I just learned the hard way that (prn ..) in a macro emits the printed text into the compiled file, at least under Figwheel main dev builds.

it happened that the output in my case kinda resembled JS code, and I was getting syntax errors in the browser that made no sense at first.

i think *out* is bound to the output file during compilation?

i think this might be it: https://github.com/clojure/clojurescript/blob/master/src/main/clojure/cljs/compiler.cljc#L1529-L1530

I'm executing this code from a cljs file, after installing cystoscape via npm (I'm using shadow-cljs

(ns minimal.core
    (:require
      ["cytoscape" :as cytoscape]))

(def graph
  (cytoscape
   (clj->js {:container (.getElementById js/document "graph")
             :elements [{:group "nodes" :data {:id 1 :immediate "a"}}
                        {:group "nodes" :data {:id 2 :immediate "b"}}
                        {:group "edges" :data {:id 12 :source 1 :target 2 :immediate "meh"}}]
             :style [{:selector "node"
                      :style {:label "data(immediate)"}}]})))

(.add graph (clj->js {:group "nodes" :data {:id 3 :immediate "c"}}))

Collection [Element(1), _private: {…}]0: Element [Element(1), _private: {…}]length: 1_private: {eles: Collection(1), cy: Core, rebuildMap: ƒ}__proto__: Array RangeError: Maximum call stack size exceeded
    at Object.eval [as cljs$core$ILookup$_lookup$arity$2] (cljs.core.js:23845)
    at Function.eval [as cljs$core$IFn$_invoke$arity$2] (cljs.core.js:6641)
    at Object.eval [as cljs$core$IFn$_invoke$arity$1] (cljs.core.js:11321)
    at cljs$core$pr_writer (cljs.core.js:33105)
    at Object.cljs$core$pr_sequential_writer [as pr_sequential_writer] (cljs.core.js:32802)
    at Object.cljs$core$pr_writer_impl [as pr_writer_impl] (cljs.core.js:33011)
    at cljs$core$pr_writer (cljs.core.js:33113)
    at Object.cljs$core$pr_sequential_writer [as pr_sequential_writer] (cljs.core.js:32802)
    at Object.cljs$core$pr_writer_impl [as pr_writer_impl] (cljs.core.js:33011)
    at cljs$core$pr_writer (cljs.core.js:33113)

If you try (do (your form above) nil) does it work?

it does, and doesn't cause the error! But why?

The error above had some stack traces in the printer. So it seemed like it was “working” but just blowing up printing the result in the repl

I see! Thanks a lot for explaining that!

and is writing (do MyForm nil) (or defining (silence MyForm) the best I can do here?

You can’t print the value. But the value itself is fine. If you’re using the repl the p is killing you. If it’s just in regular code or not the return value of an expression if printed it’s fine

I see, thanks again 🙂

You know, looking into eval in clojurescript some more, is there any reason why find-ns-obj can't work in :target :bundle?