re-com

A ClojureScript library of UI components for Reagent.

re-com provides:

• familiar UI widgetry components such as dropdowns, date pickers, popovers, tabs, etc.
• layout components, which arrange widgets vertically and horizontally, within splitters, etc. Plus components which put borders around their children. These various pieces can be arbitrarily nested to create sophisticated layouts.
• a mostly Bootstrap look, mixed with some Material Design Icons.

In short, re-com attempts to provide the UI basics needed to build a desktop-class SPA app.

Warning: No Mobile Focus

None of the components have been designed with mobile in mind. We said we had a desktop app focus, right?

Neither have we been worried too much about code size because other design goals have taken precedence. To give you some idea, our main demo app which includes every component, plus all demo code and plenty of yadda yadda explanatory strings, comes to about 167K compressed when using :optimizations :advanced (700K uncompressed). That number includes ReactJS plus the ClojureScript libs and runtime. So, everything. Note: these numbers no longer match the demo app. We wanted to show off some of the debug features in our demo app, so we backed away from fully advanced, minified compilation.

So, Without Ado Being Any Furthered ...

Start by looking at the demo, it:

• Provides detailed documentation for each component
• Provides interactive pages showing component use and flexibility.

Navigating The Source

When running the demo app, look to the right of each page's title, and you'll see hyperlinks that will take you to the associated source code. That's a convenient way to navigate to either the components themselves or the demo code.

When browsing the code, look in the src directory or this repo, you'll notice two subdirectories:

• src/re-com - the library itself - the components
• src/re-demo - the demo app, which documents the components and shows how to use them

There's also:

• run/resources/public contains assets (CSS, fonts, JS) that you'll likely need if you are developing an app based on re-com
• test/ with cljs.test suites for many components (e.g., box_test.cljs, selection_list_test.cljs).
• docs/ containing notes about development tools and release procedures (note: the demo app has detailed documentation on each component).
• scripts/ with utilities (e.g., add-at-macro for adding the at macro to legacy codebases)

Useful Commands

To run these commands, you'll need these programs installed on your machine:

• npm
• clojure
• babashka

1. Getting The Repo

   git clone https://github.com/day8/re-com.git

   cd re-com

2. Compiling And Running The Demo

   bb watch

   This will prepare the demo, by doing:

   • a clean
   • a compile

   Wait until [:demo] Build completed. is displayed in the console indicating the dev HTTP server is ready.

   Now you can open http://localhost:3449/ in your browser.

3. Run The (erm, modest) Tests

   bb ci

   This will:

   • clean
   • compile the tests
   • compile in release mode as a basic optimized build check

4. Run or Debug the tests:

   bb watch

5. Deploy The Demo App To S3 bucket

   This will only work if you have the right credentials in your env:

   bb deploy-aws

Using re-com

For a fast start, use https://github.com/day8/re-frame-template to create your own app (add the +re-com option when using re-frame-template).

re-com is available from clojars. Add it to your project.clj dependencies:

You should now be able to require the re-com.core namespace, which exposes all of the API functions documented in the re-demo example app.

You'll then need to include these asset folders in your app: https://github.com/day8/re-com/tree/master/run/resources/public/assets

As far as your index.html is concerned, take inspiration from here: https://github.com/day8/re-com/tree/master/run/resources/public

In particular, you'll need bootstrap (assumedly via a CDN):

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/css/bootstrap.css">

And a reference to these two CSS files (make sure re-com.css appears after bootstrap.css):

<link rel="stylesheet" href="assets/css/material-design-iconic-font.min.css">
<link rel="stylesheet" href="assets/css/re-com.css">

And a reference to the Roboto fonts (but this can be overridden relatively easily):

<link href="http://fonts.googleapis.com/css?family=Roboto:300,400,500,700,400italic" rel="stylesheet" type="text/css">
<link href='http://fonts.googleapis.com/css?family=Roboto+Condensed:400,300' rel='stylesheet' type='text/css'>

Reagent comes bundled with a matching version of ReactJS, so you don't need to include it explicitly.

MVC

If you decide to use re-com, consider also using re-frame (an MVC-ish framework).

Although re-frame and re-com can be used independently, they dovetail well together.

Related projects

re-com-tailwind - an edition of re-com that is compatible with tailwindcss re-frame-template - start a re-com project with one command: lein new re-frame +re-com

The Missing Components

• menus - there's a dropdown, but no cascading menus
• accordion
• maybe a dockable LHS navbar
• drag and drop.
• animations / transitions. We have ideas. They seem clunky.
• Focus management - When the user presses tab, to which field does focus move?

Helping

1. Where the docs are wrong or fall short, write up something better. Because our docs take the form of an app written in ClojureScript using re-com, you're actually exercising your knowledge of re-com as you do this.
2. See the list of missing components above. You'll have to produce the component itself, including a params spec, plus the extra page in the demo app.
3. Test re-com on new browsers and iron out any quirks. Our focus is strictly Chrome.

When creating new components, we have found it useful to use the CSS from existing JavaScript projects (assuming their licence is compatible with MIT) and then replace the JavaScript with ClojureScript. Reagent really is very nice.

Also, please refer to CONTRIBUTING.md for further details on creating issues and pull requests.

License

Copyright © 2015-2025 Michael Thompson

Distributed under The MIT License (MIT) - See LICENSE.txt