【造轮子】左右伸缩兼左右滑动的区间滑块

2021-08-08 分类：JavaScript 作者：管理员阅读（260）

基于JavaScript编写的一个原生区间滑块

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>slider-range</title>
</head>
<style>
* {
margin: 0;
padding: 0;
}
.timelineScroll {
width: 468px;
height: 90px;
overflow-x: scroll;
overscroll-behavior: contain;
margin: 50px auto;
}
.timelineScroll::-webkit-scrollbar {
-webkit-appearance: none;
}
.timelineScroll::-webkit-scrollbar:vertical {
width: 6px;
}
.timelineScroll::-webkit-scrollbar:horizontal {
height: 6px;
}
.timelineScroll::-webkit-scrollbar-thumb {
border-radius: 6px;
border: 0 solid #dfdfdf;
background-color: rgba(0, 0, 0, 0.2);
}
.timelineScroll::-webkit-scrollbar-thumb:hover {
background-color: rgba(0, 0, 0, 0.3);
}
.timelineScroll::-webkit-scrollbar-track {
background-color: #dfdfdf;
border-radius: 2px;
box-shadow: 0 0 1px #fff;
}
.timelineScrollinner {
min-width: 444px;
box-sizing: content-box;
height: 100%;
padding: 0 12px;
overflow: hidden;
}
.rule-ruleContainer {
position: relative;
white-space: nowrap;
height: 28px;
cursor: default;
border-bottom: 1px solid rgba(0, 0, 0, 0.1);
margin-right: -20px;
}
.timelineBack::before,
.timelineBack::after {
content: '';
position: absolute;
top: 0;
height: 100%;
width: 12px;
background: #d1d1d1;
}
.timelineBack::before {
left: -12px;
border-radius: 2px 0 0 2px;
}
.timelineBack::after {
right: -12px;
border-radius: 0 2px 2px 0;
}
.timelineBack {
box-sizing: content-box;
position: relative;
background: #d1d1d1;
height: 30px;
line-height: 30px;
margin-top: 12px;
/* margin-bottom: 25px; */
}
.timeline {
position: relative;
height: 100%;
background: #d1d1d1;
user-select: none;
z-index: 1;
}
.highlights {
height: 100%;
}
.highlightsCon {
position: relative;
overflow: hidden;
width: 100%;
height: 100%;
}
/* selecton */
.selection {
position: absolute;
top: 0;
height: 100%;
background: rgba(66, 133, 244, 0.25);
text-align: center;
color: #fff;
font-size: 12px;
border-radius: 2px;
z-index: 1;
cursor: pointer;
}
.selection:before {
content: '';
position: absolute;
left: -1px;
top: 0;
right: -1px;
bottom: 0;
border: 1px solid #4285f4;
}
.selectionText {
white-space: nowrap;
overflow: hidden;
}
.dragLeft {
position: absolute;
top: 0;
height: 100%;
width: 12px;
background: #4285f4;
border: 0;
padding: 0;
cursor: ew-resize;
left: -12px;
border-radius: 2px 0 0 2px;
}
.dragLeft::before,
.dragLeft::after,
.dragRight::before,
.dragRight::after {
content: '';
position: absolute;
width: 1px;
height: 8px;
background: #fff;
margin: 1px;
top: 10px;
}
.dragLeft::before,
.dragRight::before {
left: 3px;
}
.dragLeft::after,
.dragRight::before {
right: 3px;
}
.dragLeft > span,
.dragRight > span {
position: absolute;
bottom: 33px;
transform: translate(-50%);
left: 50%;
visibility: visible;
}
/* dragRight */
.dragRight {
position: absolute;
top: 0;
height: 100%;
width: 12px;
background: #4285f4;
border: 0;
padding: 0;
cursor: ew-resize;
outline: none;
right: -12px;
border-radius: 0 2px 2px 0;
}
.dragRight:not(:hover):not(:active) > span,
.dragLeft:not(:hover):not(:active) > span {
visibility: hidden;
color: #000;
}
.dragRight > span > span,
.dragLeft > span > span {
display: block;
background: #4285f4;
height: 20px;
padding: 0 4px;
border-radius: 2px;
line-height: 20px;
}
.rule-item {
position: absolute;
bottom: 0;
display: inline-block;
}
.rule-item > span {
position: absolute;
left: -2px;
text-align: center;
bottom: 10px;
color: rgba(0, 0, 0, 0.85);
font-size: 12px;
pointer-events: none;
}
.rule-ruleSubList {
display: flex;
justify-content: space-between;
align-items: flex-end;
position: absolute;
width: 100%;
bottom: 0;
}
.rule-ruleSubList i {
border-left: 1px solid rgba(0, 0, 0, 0.1);
width: 0;
height: 4px;
}
.rule-ruleSubList i:first-child {
border-left: 1px solid rgba(0, 0, 0, 0.65);
height: 4px;
}
</style>
<body>
<div class="timelineScroll">
<div class="timelineScrollinner">

<div class="rule-ruleContainer">
<div class="rule-item" style="width: 110px; left: 0px">
<span>00:00:00</span>
<div class="rule-ruleSubList"><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i></div>
</div>
<div class="rule-item" style="width: 110px; left: 110px">
<span>00:00:00</span>
<div class="rule-ruleSubList"><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i></div>
</div>
</div>

<div class="timelineBack">
<div class="timeline">
<div class="highlights">
<div class="highlightsCon"></div>
</div>

<div class="selection" style="left: 0px">
<div class="selectionText">0</div>

<div class="dragLeft">
<span>
<span style="margin-left: 30px" class="leftText">00:00</span>
</span>
</div>

<div class="dragRight">
<span>
<span style="margin-left: 0px" class="rightText">00:00</span>
</span>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
<script>
// 滑块类
class RangeSlider {
constructor(userOptions) {
this._init(userOptions)
}
_init(userOptions) {
// 合并参数
this.options = userOptions
// 滑块轨道容器
this.container = this._get(this.options.sliderContainer)
// 滑块内容容器
this.content = this._get(this.options.sliderContent)
// 滑块左边按钮
this.left = this._get(this.options.sliderLeft)
// 滑块右边按钮
this.right = this._get(this.options.sliderRight)
// 滑块左边按钮顶部提示
this.leftText = this._get(this.options.leftText)
// 滑块右边按钮顶部提示
this.rightText = this._get(this.options.rightText)
// 滑块内容按钮提示
this.contentText = this._get(this.options.contentText)
// 设置初始值
this._setAttr()
this._textRefresh()
// 添加事件
this.content.onmousedown = ({ target: { className }, clientX }) => {
// 滑块宽度动态值
let sliderWidth = this.content.offsetWidth
// 滑块宽度距离左边动态值
let sliderLeft = this.content.offsetLeft
switch (className) {
case 'selection':
// 滑块 X 坐标计算
this.disX = clientX - this.content.offsetLeft
// 滑块最大left 值
let sliderMaxLeft = this.container.offsetWidth - sliderWidth
document.onmousemove = ({ clientX }) => {
this.content.style.left = clientX - this.disX < 0 ? 0 : clientX - this.disX > sliderMaxLeft ? sliderMaxLeft + 'px' : clientX - this.disX + 'px'
this._textRefresh()
}
break
case 'dragLeft':
// width 增 ↑ left ↓
// 滑块 X 坐标计算
this.disX = clientX
// 滑块右边按钮至轨道最左边变距离
let rightWidth = this.content.getBoundingClientRect().right - this.container.getBoundingClientRect().left // 固定值
// 移动
document.onmousemove = ({ clientX }) => {
// 两点间的 x 差值
let diff = this.disX - clientX
let n1 = sliderWidth + diff
let n2 = sliderLeft - diff
if (this.options.rangeMin && n1 <= this.options.rangeMin) {
n1 = this.options.rangeMin
n2 = rightWidth - this.options.rangeMin
} else if (this.options.rangeMax && n1 >= this.options.rangeMax) {
n1 = this.options.rangeMax >= rightWidth ? rightWidth : this.options.rangeMax
n2 = rightWidth - (this.options.rangeMax >= rightWidth ? rightWidth : this.options.rangeMax)
} else if (n1 >= rightWidth) {
n1 = rightWidth
n2 = 0
} else if (n2 >= rightWidth) {
n1 = 0
n2 = rightWidth
}
this.content.style.left = n2 + 'px'
this.content.style.width = n1 + 'px'
this.right.style.left = n1 + 'px'
this._textRefresh()
}
break
case 'dragRight':
// 滑块 X 坐标计算
this.disX = clientX - this.right.offsetLeft
document.onmousemove = ({ clientX }) => {
// 容器宽度
let c_w = this.container.offsetWidth
// 滑块左边可滑动距离
let c_l = this.content.offsetLeft
// 左边最大可以滑动距离
let sliderMaxLeft = this.options.rangeMax ? (this.options.rangeMax >= c_w - c_l ? c_w - c_l : this.options.rangeMax) : c_w - c_l
// 如果两点x坐标差值小于等于最小值？
let diff = clientX - this.disX

let num = diff <= (this.options.rangeMin || 0) ? this.options.rangeMin || 0 : diff >= sliderMaxLeft ? sliderMaxLeft : diff

this.right.style.left = num + 'px'
this.content.style.width = this.right.offsetLeft + 'px'
this._textRefresh()
}
}
document.onmouseup = () => {
document.onmousemove = null
document.onmouseup = null
}
return false
}
}

// 执行属性初始化
_setAttr() {
// 主要设置
let val = this.options.initRangeValue || 0
this.right.style.left = val + 'px'
this.content.style.width = val + 'px'
this.contentText.innerText = val
}

// 获取 DOM 节点方法
_get(selector) {
return document.querySelector(selector)
}

// 文案同步刷新
_textRefresh() {
// 开始按钮距离左边的距离
let start = this.content.offsetLeft
// 结束按钮距离左边的距离
let end = this.content.getBoundingClientRect().right - this.container.getBoundingClientRect().left
// 容器的总宽度
let total = this.container.offsetWidth
// 刷新左边按钮 tip 文案
this.leftText.innerText = start
// 刷新右边按钮 tip 文案
this.rightText.innerText = end
// 刷新内容按钮 tip 文案
this.contentText.innerText = end - start
}

/**
* @description: 手动设置右边按钮拉伸到右边，
* @param { Number } n：设置的值范围为： {0, rightMax：右边最大距离值}
*/
rightStretch(n) {
// 边界处理
let rightMax = this.container.offsetWidth - this.content.offsetLeft
this.content.style.width = this.right.style.left = (n >= rightMax ? rightMax : n) + 'px'
this._textRefresh()
return this
}

/**
* @description: 手动设置左边按钮拉伸到左边，
* @param { Number } n：设置的值范围为： { leftMax：左边最大距离值，0}
*/
leftStretch(n) {
// <左边最大距离值>
let leftMax = this.content.getBoundingClientRect().right - this.container.getBoundingClientRect().left
// 如果左边按钮超出最大距离左边边界值，则就都设置成 <左边最大距离值>leftMax
this.content.style.width = this.right.style.left = (n >= leftMax ? leftMax : n) + 'px'
// 边界处理
this.content.style.left = (n <= leftMax ? leftMax - n : 0) + 'px'
this._textRefresh()
return this
}

/**
* @description: 手动设置滑块整体向右 / 向右移动
* @param { Number } n ：移动距离 {左边：0，右边：max }
*/
move(n) {
let max = this.container.offsetWidth - this.content.offsetWidth
this.content.style.left = (n >= max ? max : n) + 'px'
this._textRefresh()
return this
}
}
const rangeSlider = new RangeSlider({
sliderContainer: '.highlights', // 滑块容器类
sliderContent: '.selection', // 滑块内容类
sliderLeft: '.dragLeft', //滑块左边按钮类
sliderRight: '.dragRight', // 滑块右边按钮类
leftText: '.leftText', // 滑块左边刻度类
rightText: '.rightText', // 滑块右边刻度类
contentText: '.selectionText', // 滑块内容文案类
initRangeValue: 100, // 初始区间值
rangeMax: 200, // 最大区间值
rangeMin: 50 // 最小区间值
})
</script>
</html>

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