Another question. Is `do` a bad habit in ClojureScript? It seems like it could be abused... like, it's the closest way to creating side effects in a clojure function.
Thanks again. Kurt On Monday, June 29, 2015 at 1:18:38 PM UTC-4, Kurt Mueller wrote: > I could kiss you. > > If you like, you can formally answer my stack overflow post and I'll mark > yours as the correct answer. If not, I'll answer it on your behalf and > reference this post. > > I can see how my code snippet was wrong now. Here's how I interpret your > correct code: > > #(do (reset! amt (-> % .-target .-value)) > (re-frame/dispatch [:update-value @amt])) > > The on-change function is a callback (do those exist in clojure?). When > called, it grabs the event (in this case, it's represented as argument > literal) and the event target and value and set is amt to be equal to it. > Then, it dispatches that amount to the update-value handler. > > Is that a correct reading? > > Thanks for your help again! I really appreciate it. > > Kurt > > On Monday, June 29, 2015 at 11:10:00 AM UTC-4, Daniel Kersten wrote: > > Can you confirm that amt is a reagent ratom and not a clojure atom? > > > > The on-change in the second example is not correct - the anonymous function > > is thrown away and the dispatch runs on render. You probably wanted this: > > > > #(do (reset! amt (-> % .-target .-value)) > > > > (re-frame/dispatch [:update-value @amt])) > > > > That is, the do is inside the function. > > > > > > > > On Mon, 29 Jun 2015 15:18 Kurt Mueller <kurtrona...@gmail.com> wrote: > > I've asked this question on StackOverflow: > > http://stackoverflow.com/questions/31107633/re-frame-input-on-change-reset-doesnt-change-input-value > > > > > > > > I figure it couldn't hurt asking it here: > > > > > > > > --- > > > > In the code below, I am having trouble with updating the input value when > > the user types something in: > > > > > > > > ``` > > > > (defn measurement-input [{:keys [amount unit path]}] > > > > (let [amt (atom amount)] > > > > (fn [] > > > > [:div > > > > [:input {:type "text" > > > > :value @amt > > > > :on-change #(reset! amt (-> % .-target .-value))}] > > > > [:input {:type "button" > > > > :value unit}]]))) > > > > ``` > > > > > > > > The input value will not change until until I change :value to > > :defaultValue. I am pretty sure the above example closely mirrors Reagent's > > input example. > > > > > > > > --- > > > > > > > > In the code below, I am trying to do two things when the user updates the > > input value. I'm trying to reset! the input's value as well as dispatch the > > value to an event handler. I've wrapped up both of these function calls in > > a do call. > > > > > > > > Also of note is that in the code below, the user is able to update the > > value in the text field. > > > > > > > > ``` > > > > (defn measurement-input [{:keys [amount unit path]}] > > > > (let [amt (atom amount)] > > > > (fn [] > > > > [:div > > > > [:input {:type "text" > > > > :value @amt > > > > :on-change (do #(reset! amt (-> % .-target .-value)) > > > > (re-frame/dispatch [:update-value @amt]))}] > > > > [:input {:type "button" > > > > :value unit}]]))) > > > > ``` > > > > > > > > In the javascript console, I get the following error: > > > > > > > > ``` > > > > Uncaught TypeError: Cannot read property 'call' of null > > template.cljs?rel=1435381284083:101 > > > > ``` > > > > > > > > Any help is appreciated! > > > > > > > > -- > > > > 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 clojurescrip...@googlegroups.com. > > > > To post to this group, send email to clojur...@googlegroups.com. > > > > Visit this group at http://groups.google.com/group/clojurescript. -- 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.
