React implements list scrolling component

1.Demand

When developing a project, after obtaining the data list from the server, it is displayed to the user: it is necessary to achieve the automatic scrolling effect of data. How to achieve this? As shown below:

2. Realize

Write the function that needs to be implemented above into a component, and the page can directly call the component. The code is as follows:

To introduce the code to the component page:   

import Scroll from "../../components/Scroll";
 
const Index = () => {
 
 return (
        <div class={style.main}>
                <Scroll />
        </div>
    ）
}
 
export default Index;

Components:

import style from "./style.less";
import React, { useEffect, useRef, useState } from "react";
 
const Scroll = () => {
        const timer = useRef(null);
        //这里的数据是通过服务端api接口获取的
        const marqueeList = [
            {
                phone: "155****1111",
                content: "签到获取",
                money: 12.22,
            },
            {
                phone: "151****1111",
                content: "签到获取",
                money: 2,
            },
            {
                phone: "152****1111",
                content: "签到获取",
                money: 2.22,
            },
            ...
        ];
        //是否滚动
        const [isScrolle, setIsScrolle] = useState(true);
        //滚动速度，值越小，滚动越快
        const scrollSpeed = 100;
        const warper = useRef();
        //原数据
        const childDom = useRef();
        //拷贝数据
        const childDomCopy = useRef();
        //鼠标移动，移除方法
        const hoverHandler = (flag) => setIsScrolle(flag);

        useEffect(() => {
            // 设置轮播滚动多拷贝一层，让它无缝滚动
            childDom.current.innerHTML = childDomCopy.current.innerHTML;
            if (isScrolle) {
                if (timer.current) {
                    clearInterval(timer.current);
                }
                timer.current = setInterval(() => {
                    warper.current.scrollTop >= childDom.current.scrollHeight
                        ? (warper.current.scrollTop = 0)
                        : warper.current.scrollTop++;
                }, scrollSpeed);
            }
            return () => {
                clearInterval(timer.current);
            };
        }, [isScrolle]);

        return (
            <div class={style.content}>
                <div class={style.parent} ref={warper}>
                    <div class={`${style.ul_scoll}`} ref={childDomCopy}>
                        {marqueeList.map((value, index) => (
                            <li
                                style={
   
   {backgroundColor: index % 2 == 0 ? "#S1AAAA" : "#ABCDEF"}}
                                key={value}
                                onMouseOver={() => hoverHandler(false)}
                                onMouseLeave={() => hoverHandler(true)}
                            >
                                <div class={style.li_intro}>
                                    <div>
                                        {value.phone}
                                    </div>
                                    <div>
                                        {value.content}
                                    </div>
                                    <div class={style.li_money_intro}>
                                        <div  class={style.li_money}>
                                            +{value.money}
                                        </div>
                                        <div  class={style.li_rmb}>
                                            RMB
                                        </div>
                                    </div>
                                </div>
                            </li>
                        ))}
                    </div>
                    <div class={`${style.ul_scoll}`} ref={childDomCopy}></div>
                </div>
            </div>
        );
};
 
export default Scroll;

css:

.content {
  width: 100%;
  height: 14.16rem;
  overflow: hidden;
  position: relative;
  margin: auto;
}

.parent {
  top: 1rem;
  position: relative;
  height: 11.16rem;
  overflow: hidden;
  line-height: 2.5rem;
  overflow-y: scroll;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.parent::-webkit-scrollbar {
  display: none;
}

.ul_scoll li {
  width: 100%;
  height: 2.5rem;
  font-size: 0.9rem;
  font-weight: bold;
  text-align: center;
  letter-spacing: 0.025rem;
  line-height: 2.5rem;
  color: red;
}

.li_intro {
  color: #205F59;
  font-weight: 930;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  display: flex;
  padding-left: 0.25rem;
  padding-right: 0.25rem;
}

.li_money_intro {
  display:flex;
  color: #39B54A;
}

.li_oney {
  font-size: 1rem;
}

.li_rmb {
  color:#FF6000;
  margin-left:0.8rem;
  font-size: 0.8rem;
}

In this way, the data can be continuously scrolled.