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Javascript 2022-02-01 13:26:17
event listener for functional component
import React, { useEffect } from 'react'; const Component = (props) => { useEffect(() => { window.addEventListener('scroll', handleScroll); }); useEffect(() => { return () => { window.removeEventListener('scroll', handle... Add solution -
Javascript 2022-01-28 23:20:36
add pdf in react app
import React, { PureComponent } from "react" import { Document, Page } from "react-pdf/build/entry.webpack" import throttle from "lodash.throttle" import pdf from "./pdf.pdf" class App extends PureComponent { con... Add solution -
Javascript 2022-01-27 05:00:40
how to set state when change viewport react
import React, { useLayoutEffect, useState } from 'react'; function useWindowSize() { const [size, setSize] = useState([0, 0]); useLayoutEffect(() => { function updateSize() { setSize([window.innerWidth, window.innerHeight]); } wi... Add solution -
Javascript 2022-01-26 06:55:53
inject css with javascript
let isScrolled = false; window.addEventListener("scroll", () => { if (window.scrollY < 800) { let styleString1 = `body {background: silver;}` const style1 = document.createElement('style'); style1.textContent = styleStri... Add solution -
Javascript 2022-01-23 09:10:29
js document on load
//two ways of executing JS code after page is loaded, use "DOMContentLoaded" when able document.addEventListener("DOMContentLoaded", function(){ //dom is fully loaded, but maybe waiting on images & css files }); window.... Add solution
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