reactjs

What is the best way to trigger change or input event in react js

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For React 16 and React >=15.6 Setter .value= is not working as we wanted because React library overrides input value setter but we can call the function directly on the input as context. var nativeInputValueSetter = Object.getOwnPropertyDescriptor(window.HTMLInputElement.prototype, “value”).set; nativeInputValueSetter.call(input, ‘react 16 value’); var ev2 = new Event(‘input’, { bubbles: true}); input.dispatchEvent(ev2); For textarea element you … Read more

React functions inside render()

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A function in the render method will be created each render which is a slight performance hit. It’s also messy if you put them in the render, which is a much bigger reason, you shouldn’t have to scroll through code in render to see the html output. Always put them on the class instead. For … Read more

Show/Hide components in ReactJS

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I’ve provided a working example that follows your second approach. Updating the component’s state is the preferred way to show/hide children. Given you have this container: <div id=”container”> </div> you can either use modern Javascript (ES6, first example) or classic JavaScript (ES5, second example) to implement the component logic: Show/hide components using ES6 Try this … Read more

How to connect Threejs to React?

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Here is an example of how to set this up (see demo): import React, { Component } from ‘react’ import * as THREE from ‘three’ class Scene extends Component { constructor(props) { super(props) this.start = this.start.bind(this) this.stop = this.stop.bind(this) this.animate = this.animate.bind(this) } componentDidMount() { const width = this.mount.clientWidth const height = this.mount.clientHeight const scene … Read more

Loading Screen on Next.js page transition

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Using the new hook api, this is how I would do it.. function Loading() { const router = useRouter(); const [loading, setLoading] = useState(false); useEffect(() => { const handleStart = (url) => (url !== router.asPath) && setLoading(true); const handleComplete = (url) => (url === router.asPath) && setLoading(false); router.events.on(‘routeChangeStart’, handleStart) router.events.on(‘routeChangeComplete’, handleComplete) router.events.on(‘routeChangeError’, handleComplete) return () … Read more

When exactly is `componentDidMount` fired?

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Inside a react component tree, componentDidMount() is fired after all children components have also been mounted. This means, that any component’s componentDidMount() is fired before its parent has been mounted. So if you want to measure DOM position and sizes etc, using componentDidMount() of a child component is an unsafe place/ time to do this. … Read more

Cannot find module ‘sass’

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To note! node-sass is deprecated as by now! Warning: LibSass and Node Sass are deprecated. While they will continue to receive maintenance releases indefinitely, there are no plans to add additional features or compatibility with any new CSS or Sass features. Projects that still use it should move onto Dart Sass. Instead you can see … Read more

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