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Henrik Wenz HaNdTriX

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View NextHistoryContext.jsx
import React from 'react'
import Router from 'next/router'
const HistoryContext = React.createContext([]);
export class HistoryProvider extends React.Component {
state = {
history: []
}
@HaNdTriX
HaNdTriX / AppBarWithTabs.js
Last active Sep 27, 2018
Example next.js and Material-UI next: TabNav with shared state
View AppBarWithTabs.js
import React from 'react'
import Router from 'next/router'
import AppBarMD from 'material-ui/AppBar'
import Tabs, { Tab } from 'material-ui/Tabs'
const routes = [
'/',
'/articles'
]
@HaNdTriX
HaNdTriX / toDataUrl.js
Last active Oct 31, 2018
Example of converting a file to a dataURL in ES6
View toDataUrl.js
const toDataURL = url => fetch(url)
.then(response => response.blob())
.then(blob => new Promise((resolve, reject) => {
const reader = new FileReader()
reader.onloadend = () => resolve(reader.result)
reader.onerror = reject
reader.readAsDataURL(blob)
}))
@HaNdTriX
HaNdTriX / imgURLToDataURL.es6
Last active Oct 31, 2018
Convert an imageURL to a base64 dataURL via canvas
View imgURLToDataURL.es6
/**
* Convert an imageURL to a
* base64 dataURL via canvas
*
* @param {String} url
* @param {Object} options
* @param {String} options.outputFormat [outputFormat='image/png']
* @param {Float} options.quality [quality=1.0]
* @return {Promise}
* @docs https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement#Methods
View react-subscribe.js
import React from 'react'
class App extends Component {
componentDidMount() {
// Subscribe here
}
componentWillUnmount() {
// Unsubscribe here
}
View hooks-clickOutside.js
import { useEffect } from 'react'
function useClickOutside(ref, onClickOutside) {
useEffect(() => {
const handleClick = (event) => {
if (!ref.current || !ref.current.contains(event.target)) {
onClickOutside(event)
}
}
window.addEventListener('click', handleClick)
@HaNdTriX
HaNdTriX / hooks-useRouter.js
Last active Feb 6, 2019
React-Router hooks usage
View hooks-useRouter.js
import { useContext } from 'react'
import { __RouterContext as RouterContext, matchPath } from 'react-router-dom'
export default function useRouter (options = {}) {
const context = useContext(RouterContext)
const location = options.location || context.location
const match = options.path
? matchPath(location.pathname, options)
: context.match
@HaNdTriX
HaNdTriX / useCachedRefHandler.js
Last active Mar 10, 2019
React hook for reducing the amount of ref event bindings
View useCachedRefHandler.js
import { useRef, useEffect } from 'react'
/**
* This hook reduces the amount of rebindings.
* Use it when your props change a lot.
*
* @param {DomRef} targetRef The reference to the dom node
* @param {String} eventName The eventName you want to bind
* @param {Function} handler The actual event handler
*/
View head.js
import React from 'react'
import ReactDOM from 'react-dom'
const isServer = typeof window === 'undefined'
const Context = React.createContext([])
export const HeadProvider = ({ head, children }) => (
<Context.Provider value={head}>
{children}
</Context.Provider>
View removeAllSWCaches.js
self.addEventListener('activate', function(event) {
event.waitUntil(
caches.keys().then(function(cacheNames) {
return Promise.all(
cacheNames.filter(function(cacheName) {
// Return true if you want to remove this cache,
// but remember that caches are shared across
// the whole origin
return true
}).map(function(cacheName) {
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