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acdlite / Dataloader.js
Last active August 15, 2018 04:36
Idea for Dataloader component
// The `loader` prop is a Dataloader instance
// https://github.com/facebook/dataloader
class Dataloader extends React.Component {
state = {data: null, isLoaded: false};
componentWillMount() {
this.prefetchData(this.props);
}
componentWillReceiveProps(nextProps) {
if (this.props.id !== nextProps.id || this.props.loader !== nextProps.loader) {
this.setState({isLoaded: false});
@acdlite
acdlite / coordinating-async-react.md
Last active June 17, 2024 11:56
Demo: Coordinating async React with non-React views

Demo: Coordinating async React with non-React views

tl;dr I built a demo illustrating what it might look like to add async rendering to Facebook's commenting interface, while ensuring it appears on the screen simultaneous to the server-rendered story.

A key benefit of async rendering is that large updates don't block the main thread; instead, the work is spread out and performed during idle periods using cooperative scheduling.

But once you make something async, you introduce the possibility that things may appear on the screen at separate times. Especially when you're dealing with multiple UI frameworks, as is often the case at Facebook.

How do we solve this with React?

@acdlite
acdlite / prefetch.js
Last active June 11, 2021 08:34
Prefetching in React
function prefetch(getKey, getValue, getInitialValue, propName) {
const inFlight = new Set();
const cache = new Map();
return ChildComponent => {
return class extends React.Component {
state = {value: getInitialValue(this.props)};
componentWillReceiveProps(nextProps) {
const key = getKey(nextProps);
if (cache.has(key)) {
// Use cached value
@acdlite
acdlite / app.js
Last active January 20, 2023 08:23
Quick and dirty code splitting with React Router v4
// getComponent is a function that returns a promise for a component
// It will not be called until the first mount
function asyncComponent(getComponent) {
return class AsyncComponent extends React.Component {
static Component = null;
state = { Component: AsyncComponent.Component };
componentWillMount() {
if (!this.state.Component) {
getComponent().then(Component => {
@acdlite
acdlite / SassMeister-input.scss
Created August 22, 2015 18:10
Generated by SassMeister.com.
// ----
// libsass (v3.2.5)
// ----
.foo :global(.some-ovid-class) .bar {
color: blue;
}
@acdlite
acdlite / app.js
Last active November 4, 2018 15:49
Minimal router using existing React Router primitives
const history = createHistory();
const router = createReactRouter(routes);
history.listen((location => {
router.match(location, (err, state, redirectInfo) => {
// Integrate with external state library (Redux), or render directly
React.render(
<RouterComponent {...state} />;
);
});
@acdlite
acdlite / gist:1168dd2c3cbd8e4cb477
Last active August 29, 2015 14:24
Potential redux-react-router API
function reactRouter(router) {
return (reducer, initialState) => next => {
const baseStore = next(reducer, initialState);
function storeIsInSyncWithRouter() {
//... blah blah implementation details
}
// Apply router middleware which intercepts TRANSITION_TO actions
const wrappedDispatch = routerMiddleware(router)()(baseStore.dispatch);
@acdlite
acdlite / flux.js
Last active October 7, 2021 17:19
A Redux-like Flux implementation in <75 lines of code
/**
* Basic proof of concept.
* - Hot reloadable
* - Stateless stores
* - Stores and action creators interoperable with Redux.
*/
import React, { Component } from 'react';
export default function dispatch(store, atom, action) {
@acdlite
acdlite / gist:c7eb7ac45617d9332b60
Last active August 29, 2015 14:20
Imagining a more functional, classless Flummox API
import Flummox from 'flummox';
import { Map } from 'immutable';
// Instead of a constructor, just wrap flux creation inside a function
export default function createFlux() {
const flux = new Flummox();
// Actions are the same. Just pass an object instead of a class.
const thingActions = flux.createActions('things', {
incrementSomething(amount) {
@acdlite
acdlite / gist:dfbac9ed62474e1be605
Created April 1, 2015 21:24
Create Flummox actions from plain JavaScript objects
const flux = new Flux();
flux.createActions('foobar', {
foo() {
return 'bar';
},
bar() {
return 'baz';
}