http://app.klipse.tech/?cljs_in.gist=viebel/aea3dad2de27c25121d1914d606d4087&container=1

reagent-tree-comp.cljs

(ns simple.core
  (:require 
    [reagent.core :as reagent :refer-macros [with-let]]
    [reagent.dom :refer [render]]))

(def my-org 
  {:name "nestle"
   :description "bla bla bla"
   :children [{:name "Choco"
               :description "woo"}
              {:name "Moka"
               :description "boo"
               :children [{:name "Elite"
                           :description "YESH"}]}]})

(defn org-tree [org]
  (with-let [opened (reagent/atom false)]
    (if @opened
      [:div 
       [:div {:onClick #(do 
                          (println "close" (:name org))
                          (reset! opened false)
                          )}
        "Name: "(:name org)]
       [:div "Description: " (:description org)]
       [:ul
        (for [child (:children org)]
          [:li [org-tree child]])]]
      [:div {:onClick #(do 
                         (println "open"  (:name org))
                         (reset! opened true)
                         )}
       "> " (:name org)])))

(defn ui []
  [org-tree my-org])

;; do not touch
(render  [ui] js/klipse-container)