Om

A ClojureScript interface to Facebook's React.

Om allows users to represent their UIs simply as EDN. Because ClojureScript data is immutable data, Om can always rapidly re-render the UI from the root. Thus Om UIs are out of the box snapshotable and undoable and these operations have no implementation complexity and little overhead.

Example

(ns example
  (:require [om.core :as om :include-macros true]
            [om.dom :as dom :include-macros true]))

(defn widget [data]
  (om/component
    (dom/div nil "Hello world!")))

(om/root {} widget js/document.body)

An implementation of TodoMVC implemented in Om exists here.

Using it

Om is pre-alpha software. You need to clone ClojureScript from master and install it via script/build. Then clone the Om repo and install it locally with lein install.

For local development your lein-cljsbuild settings should look something like this:

:cljsbuild { 
  :builds [{:id "dev"
            :source-paths ["src"]
            :compiler {
              :output-to "main.js"
              :output-dir "out"
              :optimizations :none
              :source-map true
              :externs ["om/externs/react.js"]}}]}

Your local development markup should include something like the following:

<script src="http://fb.me/react-0.5.1.js"></script>
<script src="out/goog/base.js" type="text/javascript"></script>
<script src="main.js" type="text/javascript"></script>
<script type="text/javascript">goog.require("main.core");</script>

For production your lein-cljsbuild settings should look something like this:

:cljsbuild { 
  :builds [{:id "release"
            :source-paths ["src"]
            :compiler {
              :output-to "main.js"
              :optimizations :advanced
              :pretty-print false
              :preamble ["om/react.min.js"]
              :externs ["om/externs/react.js"]
              :closure-warnings
              {:non-standard-jsdoc :off}}}]}

This will generate a single file main.js.

ghostandthemachine/om

Om

Example

Using it