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Om.next with devcards how to

Simple step by step guide to try om.next with devcards.

This assumes you have leiningen installed if not, go to http://leiningen.org/ and follow the instructions there.

Let's start by creating the basic devcards environment using the devcards template:

lein new devcards omnom
cd omnom
lein figwheel

The output should look something like this:

Figwheel: Starting server at http://localhost:3449
Focusing on build ids: devcards
Compiling "resources/public/js/compiled/omnom_devcards.js" from ["src"]...
Successfully compiled "resources/public/js/compiled/omnom_devcards.js" in 15.476 seconds.
Started Figwheel autobuilder

Launching ClojureScript REPL for build: devcards
Figwheel Controls:

    ...

  Switch REPL build focus:
          :cljs/quit                      ;; allows you to switch REPL to another build
    Docs: (doc function-name-here)
    Exit: Control+C or :cljs/quit
 Results: Stored in vars *1, *2, *3, *e holds last exception object
Prompt will show when figwheel connects to your application
To quit, type: :cljs/quit
cljs.user=>

then after it does all it's thing open http://localhost:3449/cards.html

it should look something like this:

/galleries/dev/omnom-1.png

click the omnom.core link, you should see this:

/galleries/dev/omnom-2.png

now we have to install the latest development snapshot for om to try om.next, in some folder outside your project run:

git clone https://github.com/omcljs/om.git
cd om
lein install

Now let's add the dependencies to our project, open project.clj and make the :dependencies section look like this:

:dependencies [[org.clojure/clojure "1.7.0"]
               [org.clojure/clojurescript "1.7.122"]
               [devcards "0.2.0-3"]
               [sablono "0.3.4"]
               [org.omcljs/om "0.9.0-SNAPSHOT"]
               [datascript "0.13.1"]]

Now restart fighwheel (press Ctrl + d) and run it again:

lein figwheel

reload the page.

open the file src/omnom/core.cljs and replace its content with this:

(ns omnom.core
  (:require
   [cljs.test :refer-macros [is async]]
   [goog.dom :as gdom]
   [om.next :as om :refer-macros [defui]]
   [om.dom :as dom]
   [datascript.core :as d]
   [sablono.core :as sab :include-macros true])
  (:require-macros
   [devcards.core :as dc :refer [defcard deftest]]))

(enable-console-print!)

(defcard first-card
  (sab/html [:div
             [:h1 "This is your first devcard!"]]))

(defui Hello
  Object
  (render [this]
    (dom/p nil (-> this om/props :text))))

(def hello (om/factory Hello))

(defcard simple-component
  "Test that Om Next component work as regular React components."
  (hello {:text "Hello, world!"}))

(def p
  (om/parser
    {:read   (fn [_ _ _] {:quote true})
     :mutate (fn [_ _ _] {:quote true})}))

(def r
  (om/reconciler
    {:parser p
     :ui->ref (fn [c] (-> c om/props :id))}))

(defui Binder
  Object
  (componentDidMount [this]
    (let [indexes @(get-in (-> this om/props :reconciler) [:config :indexer])]
      (om/update-state! this assoc :indexes indexes)))
  (render [this]
    (binding [om/*reconciler* (-> this om/props :reconciler)]
      (apply dom/div nil
        (hello {:id 0 :text "Goodbye, world!"})
        (when-let [indexes (get-in (om/get-state this)
                             [:indexes :ref->components])]
          [(dom/p nil (pr-str indexes))])))))

(def binder (om/factory Binder))

(defcard basic-nested-component
  "Test that component nesting works"
  (binder {:reconciler r}))

(deftest test-indexer
  "Test indexer"
  (let [idxr (get-in r [:config :indexer])]
    (is (not (nil? idxr)) "Indexer is not nil in the reconciler")
    (is (not (nil? @idxr)) "Indexer is IDeref")))


(defn main []
  ;; conditionally start the app based on wether the #main-app-area
  ;; node is on the page
  (if-let [node (.getElementById js/document "main-app-area")]
    (js/React.render (sab/html [:div "This is working"]) node)))

(main)

;; remember to run lein figwheel and then browse to
;; http://localhost:3449/cards.html

it should display the om cards if not try reloading the page.

now just keep adding cards!