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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

The above is all the content of this article "how to achieve secondary linkage effect between React and ts". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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