Examples to explain how js implements horizontal and vertical scrolling animation of dom elements

This article will introduce to you how to implement horizontal and vertical scrolling animation of dom elements in js. I hope it will be helpful to friends in need!

Scroll animation implemented through settimeout, supports repeated clicks to become faster

Supports horizontal scrolling and vertical scrolling. Quick click will superimpose the distance that has not been scrolled last time. The scrolling time remains unchanged and the scrolling speed will become faster

Usage

1. Copy the code below;

2. Export the corresponding method movingColumn - vertical scrolling moving- -Horizontal scrolling

3. The function receives 3 parameters dom: the element to be slid space: the distance to be scrolled by clicking once istop/isLeft Whether to scroll up/left

Function modification

const hz = 60 Scroll to the target position several times within the specified time. 60 is a refresh rate that can be recognized by the human eye

The time of each scrolling is 1ms * hz = 60ms in settime

let timer:any = null // 定时器
let TargetLocation = -1 // 上一次点击应该滚动到的目标位置
let toltalSpace = 0 // 本次要滚动的距离

/**
 * @info 竖直滚动
 * @info 滚动动画 hz 刷新率 可以修改滚动的速度
 * @params dom：要滚动的元素； space 要滚动的距离； istop 滚动的方向;
*/
const movingColumn = (dom:HTMLDivElement, space: number, istop:boolean) => {

  // 用户快速点击 则把上次未滚动的距离与本次滚动结合再一起
  if (timer && TargetLocation !== -1) {
    toltalSpace += TargetLocation - dom.scrollTop
    // 计算本次的目标距离
    if(istop) {
      TargetLocation = dom.scrollTop + toltalSpace + space
    } else {
      TargetLocation = dom.scrollTop + toltalSpace - space
    }
  } else if (!timer) {
    toltalSpace = 0
    TargetLocation = -1
  }

  if (istop) {
    toltalSpace -= space
  } else {
    toltalSpace += space
  }

  // 获取本次的目标位置
  const position = dom.scrollTop
  TargetLocation = position + toltalSpace

  clearInterval(timer)
  timer = null
  const hz = 60
  let i = 1
  timer = setInterval(() => {
    dom.scrollTop = position + i * toltalSpace / hz
    ++i
    if (i >= hz) {
      clearInterval(timer)
      timer = null
      dom.scrollTop = TargetLocation // 位置修正
      toltalSpace = 0
      TargetLocation = -1
    }
  }, 1)
}


/**
 * @info 水平滚动
 * @info 滚动动画 hz 刷新率 可以修改滚动的速度
 * @params dom：要滚动的元素； space 要滚动的距离； isLeft 滚动的方向;
*/
const moving = (dom:HTMLDivElement, space: number, isLeft:boolean) => {

  // 用户快速点击 则把上次未滚动的距离与本次滚动结合再一起
  if (timer && TargetLocation !== -1) {
    toltalSpace += TargetLocation - dom.scrollLeft
    // 计算本次的目标距离
    if(isLeft) {
      TargetLocation = dom.scrollLeft + toltalSpace + space
    } else {
      TargetLocation = dom.scrollLeft + toltalSpace - space
    }
  } else if (!timer) {
    toltalSpace = 0
    TargetLocation = -1
  }

  if (isLeft) {
    toltalSpace -= space
  } else {
    toltalSpace += space
  }

  // 获取本次的目标位置
  const position = dom.scrollLeft
  TargetLocation = position + toltalSpace

  clearInterval(timer)
  timer = null
  const hz = 60
  let i = 1
  timer = setInterval(() => {
    dom.scrollLeft = position + i * toltalSpace / hz
    ++i
    if (i >= hz) {
      clearInterval(timer)
      timer = null
      dom.scrollLeft = TargetLocation // 位置修正
      toltalSpace = 0
      TargetLocation = -1
    }
  }, 1)
}

export {
  moving,
  movingColumn
}

Related recommendations: [JavaScript Video Tutorial]​​​​

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