![]() (List.map (\m -> itemView address m model) model. View : Signal.Address Action -> Model -> Html (1) Is actually triggered by our ClojureScript backend. ![]() To populate the Module browser ui with modules the Refresh action is called. This is achived through the notifySelect helper function.ĬlickSelect is similar to Select but handles when the user uses the mouse to select a module.Ĭlose - When the user presses the escape key, the module browser should close. Again to make that happen we need to communicate Ultimately result in opening the Elm Module file. The Select action is triggered when the users presses Enter. The notif圜hangeSelection function call results in an effect that allows us to communicate with the ClojureScript part Prev and Next selects/highlights the next/previous module given the currently selected one. The model is NOT mutated, rather we return a new updated model.Įlm keeps track of our global model state ! Module to the first in the filtered results. To filter modules with names starting with the given search string. Whenever the user changes the search string input the Filter action is called. It’s handy when initializing the app and also for mapping effects to when there areĮffects that we don’t care about in the context of this update function We treat an effect like a value in the application, the Elm runtime takes care of actually executing it. Effects are basically things that have side-effects (http/ajax, interacting with the browser etc). The update function takes an action and the current model as parameters and returnsĪ tuple of an (possibly) updated model and an Effect. If you’re not sure what union type means, think of it as a Enum on stereoids. Now for a little fun and to show off some basic JavaScript interop, let’s add an alert.The actions that causes changes to the model is represented by a Union Type called Action. You’ll see “Page One” in browser console, but not in server console. You’ll see the home page along with the new navigation. log js/console "page-one" ) ( reset! current-page page-one )) the server side doesn't have history, so we want to make sure current-page is populated ( reset! current-page home-page )īuild both the app and server then fire up the Node application once again. ![]() log js/console "home page" ) ( reset! current-page home-page )) ( defroute "/page-one" (. project.clj ( defproject demo "0.1.0-SNAPSHOT" :description "FIXME: write this!" :url "" :min-lein-version "2.5.3" :dependencies ] :plugins ] :clean-targets ^ ]]) ( defn home-page ]) ( defn page-one ]) ( defn app-view ]) ( secretary/set-config! :prefix "/" ) ( defroute "/" (. ![]() Lets create a new project using Leiningen and the application template with lein new app demo which will set up the project structure below. In the following sections, I’m going to cover the language’s features. Creating an isomorphic ClojureScript appįor this application, I’m going to assume that you already have Java (> 1.7.0), Leiningen (2.5.3) and Node.js (v5.4.1) already installed. ClojureScript is a functional language, which means it has functions and limited additional language constructs. A benefit of an isomorphic approach is that you get the performance of rendering on the server and you can render components after the page loads on the client. While content is loading, the page is unrendered. With many Single Page Application-type architectures, when a user first hits the page, all of the assets have to download, usually taking several seconds. One huge one is what we already mentioned - code sharing. Isomorphic ClojureScript is compiled Clojure targeting JavaScript where the same code runs on both the client and server. I prepared a demo of an isomorphic ClojureScript application and below I’ll share it in more detail than I could during the talk. While preparing for it, I knew I wanted to show more real-world scenarios versus basic “Hello World” ones you can find many other places. ![]() I’ve recently returned from CodeMash 2.0.1.6 where I gave a talk entitled “Bringing the Power of Clojure to Node.js”. ![]()
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