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js滑块区间组件 原生js实现滑块区间组件

蒲公英芽 人气:0

功能需求:

1、最小值为0,按照给定的最大值,生成区间范围;
2、拖动滑块移动时,显示相应的范围区间,滑块条显示对应的状态;
3、点击时,使最近的滑块移动到鼠标点击的位置。

默认效果:

当拖动滑块时,显示如下:

分析:

下面附上代码:

html结构,实例化滑块,可以设置当前滑块的区间范围:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>slide</title>
</head>
<body>
 <script type="module">
 import Slide from "./js/Slide.js";

 init();
 function init(){
  //参数为最大范围,不传的话默认是4000
  let slide=new Slide(4200);
  slide.appendTo("body");
 }

 </script>
</body>
</html>

Slide.js文件:完成创建滑块,拖动滑块,点击滑块的功能。

import Utils from "./Utils.js";
export default class Slide{
 static styleCss=false;
 //最小范围
 minNum=0;
 //最大范围
 maxNum;
 //左边按钮的left值
 leftBtnLeft=0;
 //右边按钮的left值
 rightBtnLeft=238;
 constructor(_max=4000){
 //最大值默认为4000
 this.maxNum=_max;
 this.elem=this.createElem();
 }
 createElem(){
 if(this.elem) return this.elem;
 //创建最外层容器
 let div=Utils.createE("div");
 div.className="slideContainer";
 div.innerHTML=`<p class="priceTxt">价格<span id="rangeText">¥${this.minNum}-${this.maxNum}</span></p>
 <div class="rangeContainer" id="rangeContainer">
  <div class="bgRange" id="bgRange"></div>
  <div class="priceRange" id="priceRange"></div>
  <span id="leftBtn" class="leftBtn"></span>
  <span id="rightBtn" class="rightBtn"></span>
 </div>`;
 Utils.getIdElem(div,this);
 //设置样式
 Slide.setStyles();
 //给父元素监听mousedown事件
 this.rangeContainer.addEventListener("mousedown",e=>this.mouseHandler(e))
 return div;
 }
 appendTo(parent){
 Utils.appendTo(this.elem,parent);
 }
 mouseHandler(e){
 //注意:getBoundingClientRect()返回的结果中,width height 都是包含border的
 let rect=this.rangeContainer.getBoundingClientRect();
 switch (e.type) {
  case "mousedown":
  //取消鼠标快速拖动的默认事件
  e.preventDefault();
  this.x = e.offsetX;
  this.btnType=e.target.id;
  //如果点击的是背景条,执行rangeClick函数
  if(/Range/.test(this.btnType)){
   e.stopPropagation();
   //点击函数
   this.rangeClick(e);
   return;
  }
  //如果点击的是按钮,监听document鼠标移动事件
  this.mouseHandlers=e=>this.mouseHandler(e);
  document.addEventListener("mousemove", this.mouseHandlers);
  document.addEventListener("mouseup", this.mouseHandlers);
  break;
  case "mousemove":
  let x = e.clientX - rect.x - this.x;
  //获取左右按钮的left值
  this.leftBtnLeft=parseInt(getComputedStyle(this.leftBtn).left);
  this.rightBtnLeft=parseInt(getComputedStyle(this.rightBtn).left);
  if (this.btnType === "leftBtn") {
   //确定左边按钮的取值范围
   if (x < 0) x = 0;
   if (x > this.rightBtnLeft) x = this.rightBtnLeft;
   this.leftBtn.style.left = x + "px";
  } else if (this.btnType === "rightBtn") {
   //确定右边按钮的取值范围,减去1px边框
   if (x < this.leftBtnLeft) x = this.leftBtnLeft;
   if (x > this.bgRange.offsetWidth - 2) x = this.bgRange.offsetWidth - 2;
   this.rightBtn.style.left = x + "px";
  }
  //文字范围显示
  this.changeRangeText();
  break;
  case "mouseup":
  //移动事件监听
  document.removeEventListener("mousemove", this.mouseHandlers);
  document.removeEventListener("mouseup", this.mouseHandlers);
  break;
 }
 }
 rangeClick(e){
 //计算出鼠标点击位置的值
 let click_X=e.clientX-this.rangeContainer.getBoundingClientRect().x-this.leftBtn.offsetWidth/2;
 //判断,如果当前点击的位置是在左边按钮的左侧、或者当左右按钮重叠时,点击的位置在按钮左侧,让左边按钮移动到鼠标点击的位置
 if(Math.abs(click_X-this.leftBtnLeft)<Math.abs(click_X-this.rightBtnLeft) || 
 (this.leftBtnLeft===this.rightBtnLeft && click_X<this.leftBtnLeft)) this.leftBtn.style.left=click_X+"px";
 //否则,让右边按钮移动到鼠标点击的位置
 else this.rightBtn.style.left=click_X+"px";
 //获取移动后的左右按钮的left值
 this.leftBtnLeft=parseInt(getComputedStyle(this.leftBtn).left);
 this.rightBtnLeft=parseInt(getComputedStyle(this.rightBtn).left);
 //文字范围显示
 this.changeRangeText();
 }
 changeRangeText(){
 //计算出最小范围与最大范围的值,四舍五入
 let minTxt=Math.round(this.leftBtnLeft/(this.bgRange.clientWidth-2)*this.maxNum);
 let maxTxt=Math.round(this.rightBtnLeft/(this.bgRange.clientWidth-2)*this.maxNum);
 this.rangeText.innerText=`¥${minTxt}-${maxTxt}`;
 //滑块颜色的改变
 this.changeRangeSlide();
 }
 changeRangeSlide(){
 //滑块宽度等于左右按钮间的距离
 this.priceRange.style.width=this.rightBtnLeft-this.leftBtnLeft+"px";
 //滑块的left值等于左边按钮的left值
 this.priceRange.style.left=this.leftBtnLeft+"px";
 }
 static setStyles(){
 if(Slide.styleCss) return;
 Slide.styleCss=true;
 Utils.insertCss(".slideContainer",{
  width:"260px",
  height:"70px",
  margin:"50px"
 })
 Utils.insertCss(".priceTxt",{
  fontSize:"14px",
  color:"#666",
  marginBottom:"20px"
 })
 Utils.insertCss(".priceTxt span",{
  float:"right"
 })
 Utils.insertCss(".rangeContainer",{
  width:"260px",
  height:"20px",
  position:"relative",
 })
 Utils.insertCss(".bgRange",{
  width:"240px",
  height:"3px",
  backgroundColor:"#dedede",
  position:"absolute",
  left:"10px",
  top:"9px"
 })
 Utils.insertCss(".priceRange",{
  width:"240px",
  height:"3px",
  background:"#ffa800",
  position:"absolute",
  left:"10px",
  top:"9px"
 })
 Utils.insertCss(".rangeContainer span",{
  width: "20px",
  height: "20px",
  borderRadius:"50%",
  border:"1px solid #ccc",
  background:"#fff",
  position:"absolute",
  top:"0px",
  boxShadow:"2px 2px 2px #333"
 })
 Utils.insertCss(".leftBtn",{
  left:"0px"
 })
 Utils.insertCss(".rightBtn",{
  left:"238px"
 })
 }
}

Utils.js文件:是一个工具包文件。

export default class Utils{
 static createE(elem,style,prep){
 elem=document.createElement(elem);
 if(style) for(let prop in style) elem.style[prop]=style[prop];
 if(prep) for(let prop in prep) elem[prop]=prep[prop];
 return elem;
 }
 static appendTo(elem,parent){
 if (parent.constructor === String) parent = document.querySelector(parent);
 parent.appendChild(elem);
 }
 static randomNum(min,max){
 return Math.floor(Math.random*(max-min)+min);
 }
 static randomColor(alpha){
 alpha=alpha||Math.random().toFixed(1);
 if(isNaN(alpha)) alpha=1;
 if(alpha>1) alpha=1;
 if(alpha<0) alpha=0;
 let col="rgba(";
 for(let i=0;i<3;i++){
  col+=Utils.randomNum(0,256)+",";
 }
 col+=alpha+")";
 return col;
 }
 static insertCss(select,styles){
 if(document.styleSheets.length===0){
  let styleS=Utils.createE("style");
  Utils.appendTo(styleS,document.head);
 }
 let styleSheet=document.styleSheets[document.styleSheets.length-1];
 let str=select+"{";
 for(var prop in styles){
  str+=prop.replace(/[A-Z]/g,function(item){
  return "-"+item.toLocaleLowerCase();
  })+":"+styles[prop]+";";
 }
 str+="}"
 styleSheet.insertRule(str,styleSheet.cssRules.length);
 }
 static getIdElem(elem,obj){
 if(elem.id) obj[elem.id]=elem;
 if(elem.children.length===0) return obj;
 for(let i=0;i<elem.children.length;i++){
  Utils.getIdElem(elem.children[i],obj);
 }
 }
}

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