How to realize the effect of two-stage linkage between React and ts

This article mainly introduces React and ts how to achieve secondary linkage effect, the article is very detailed, has a certain reference value, interested friends must read it!

.tsx file

Import {Component CreateRef} from 'react' import'. / index.less' interface State {top: any ButtonList: Button [] ContentList: Content [] ButtonIndex: number} interface Button {id: string text: string} interface Content {id: string text: string height: number top: number} interface Props {} class Stairs extends Component {LeftList: Button [] RightList: Content [] kaiguan: boolean right = createRef () left = createRef () LeftTex = createRef () / oTop: number | undefined viewHeight: undefined viewHeight | Undefined offHeight: number | undefined Lefttext = createRef () top: number | undefined oTop: number | undefined constructor (props: Props) {super (props) this.state = {ButtonList: [] ContentList: [], ButtonIndex: 0, top: 0} this.LeftList = [] this.RightList = [] this.kaiguan = true this.oTop = 0} componentDidMount () {this.BtnList (20) this.ConList (20) this.setState ({ButtonList: this.LeftList, ContentList: this.RightList})} getRandom (m: number N: number): number {return parseInt (`${Math.random () * (m-n) + n}`) } BtnList (n: number) {for (let I = 0; I)

< n; i++) { this.LeftList.push({ id: `a${i}`, text: `按钮${i}`, }); } } ConList(n: number) { let ConTop = 0; for (let i = 0; i < n; i++) { let RandomHeight = this.getRandom(736, 1400); this.RightList.push({ id: `b${i}`, text: `标题${i}`, height: RandomHeight, top: ConTop, }); ConTop += RandomHeight; } } FnScroll() { // console.log(11) if (this.right.current) { this.oTop = this.right.current.scrollTop; if (this.kaiguan) { // console.log(111) let count = 0 for (var i = 0; i < this.state.ContentList.length; i++) { if (this.oTop >

= this.state.ContentList [I] .top) {count = I} this.setState ({ButtonIndex: count})} / / console.log (ButtonIndex,count)}} / / eslint-disable-next-line if (this.oTop = = this.state.ContentList [this.state.ButtonIndex] .top) {this.kaiguan = true }} Fn (index: any, ev: React.MouseEvent) {this.viewHeight = document.documentElement.clientHeight / 2 let target = ev.target as HTMLDivElement this.offHeight = target.offsetTop / / console.log (this.offHeight) if (this.offHeight > this.viewHeight) {if (this.LeftTex.current) {this.LeftTex.current.scrollTo ({top: this.offHeight-this.viewHeight-target.clientHeight / 2 Behavior: "smooth",})} / / console.log (this.LeftTex.current)} / / console.log (this.offHeight-this.viewHeight-target.clientHeight / 2) this.kaiguan = false / / this.offHeight = ev.target.offsetTop / / console.log (ev.target) if (this.right.current) {this.right.current.scroll ({top: this.RightList [index] .top, behavior: "smooth",}) } this.setState ({ButtonIndex: index})} ButtonIndex (index: number) {if (index > = 3) {if (this.left.current & & this.Lefttext.current) {this.left.current.scrollTop = (index-3) * this.Lefttext.current.offsetHeight;}} if (index

< 3) { if (this.left.current) { this.left.current.scrollTop = 0; } } this.setState({ ButtonIndex: index }) } render() { let footList = this.state.ButtonList return ( {footList.map((item, index) =>

{item.text})} {this.state.ContentList.map ((item) = > {item.text})} )} export default Stairs

.less file

.box {width: 100vw; height: 100vh; overflow-y: scroll; .box1 {height: 300px; background: # 000; width: 100%;} .box2 {height: 200px; background: tomato; width: 100%;} .box3 {position:-webkit-sticky; position: sticky; top: 0; height: 100px; background: palevioletred; z-index: 999; width: 100% } .scroll-con {width: 100vW; height: 100vh; position:-webkit-sticky; position: sticky; top: 100px; display: flex; .left, .right {height: 100vh; overflow-y: scroll;} .left {width: 20vW; .left-txt {width: 20vW; height: 100px; text-align: center Line-height: 100px; background: red;}. Left-txt.ac {background: lightcoral; z-index: 999;}} .right {width: 80vw; .right-title {width: 100%; height: 5vh; background: darkblue; color: aqua; line-height: 5vh;}

Finally, add the self-defined folder to the route.

The effect picture is as follows

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