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This project is part of the @thi.ng/umbrella monorepo.


Lightweight, reactive, VDOM-less UI/DOM components with async lifecycle and @thi.ng/hiccup compatible.


ALPHA - bleeding edge / work-in-progress

Search or submit any issues for this package


This is still a young project. Even though most of the overall approach, component lifecycle and API are fairly stable by now (after ~70 commits over several months), so far there's only sparing documentation and only a handful of public examples. After some more user feedback, there's likely going to be further refactoring required here and there, none of which is expected to cause breaking changes in this core package and will likely come in the form of additions or alternatives to existing control structures (unless they would be entirely subsuming current features/approaches)...

@thi.ng/atom integration

For the sake of deduplication of functionality and to keep the number of dependencies to a minimum, direct @thi.ng/atom integration has been removed in favor of using relevant @thi.ng/rstream constructs, which can be used as lightweight adapters, i.e.:

Support packages


yarn add @thi.ng/rdom
// ES module
<script type="module" src="https://unpkg.com/@thi.ng/rdom?module" crossorigin></script>

// UMD
<script src="https://unpkg.com/@thi.ng/rdom/lib/index.umd.js" crossorigin></script>

Package sizes (gzipped, pre-treeshake): ESM: 3.81 KB / CJS: 3.97 KB / UMD: 3.93 KB


Usage examples

Several demos in this repo's /examples directory are using this package.

A selection:

ScreenshotDescriptionLive demoSource
Probabilistic color theme generatorDemoSource
Color palette generation via dominant color extraction from uploaded imagesDemoSource
Interactive visualization of closest points on ellipsesDemoSource
Parser grammar livecoding editor/playground & codegenDemoSource
Interactive pixel sorting tool using thi.ng/color & thi.ng/pixelDemoSource
Demonstates various rdom usage patternsDemoSource
rdom drag & drop exampleDemoSource
rdom & hiccup-canvas interop testDemoSource
Full umbrella repo doc string search w/ paginated resultsDemoSource
rdom powered SVG graph with draggable nodesDemoSource


Generated API docs


Currently, documentation only exists in the form of small examples and various doc strings (incomplete). I'm working to alleviate this situation ASAP... In that respect, PRs are welcome as well!

import { $compile } from "@thi.ng/rdom";
import { reactive } from "@thi.ng/rstream";
import { cycle, map } from "@thi.ng/transducers";

// reactive value
const bg = reactive("gray");

// color options (infinite iterable)
const colors = cycle(["magenta", "yellow", "cyan"]);

// event handler
const nextColor = () => bg.next(<string>colors.next().value);

// define component tree in hiccup syntax, compile & mount component.
// each time `bg` value changes, only subscribed bits will be updated
// i.e. title, the button's `style.background` and its label

// Note: instead of direct hiccup syntax, you could also use the
// element functions provided by https://thi.ng/hiccup-html
    // transformed color as title (aka derived view)
    ["h1", {}, bg.transform(map((col) => `Hello, ${col}!`))],
        // tag with Emmet-style ID & classes
            // reactive CSS background property
            style: { background: bg },
            onclick: nextColor,
        // reactive button label


Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

  title = "@thi.ng/rdom",
  author = "Karsten Schmidt",
  note = "https://thi.ng/rdom",
  year = 2020


© 2020 - 2021 Karsten Schmidt // Apache Software License 2.0

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