本文實(shí)例為大家分享了js實(shí)現(xiàn)滑塊區(qū)間組件的具體代碼,供大家參考,具體內(nèi)容如下
功能需求:
1、最小值為0,按照給定的最大值,生成區(qū)間范圍;
2、拖動(dòng)滑塊移動(dòng)時(shí),顯示相應(yīng)的范圍區(qū)間,滑塊條顯示對(duì)應(yīng)的狀態(tài);
3、點(diǎn)擊時(shí),使最近的滑塊移動(dòng)到鼠標(biāo)點(diǎn)擊的位置。
默認(rèn)效果:
當(dāng)拖動(dòng)滑塊時(shí),顯示如下:
分析:
- 首先布局要寫好,一共有4個(gè)元素,兩個(gè)滑塊和兩個(gè)滑塊條。布局時(shí)要考慮到后期對(duì)滑塊和滑塊條進(jìn)行事件監(jiān)聽,盡可能少地出現(xiàn)事件冒泡;
- 拖動(dòng)滑塊時(shí),要區(qū)分是左邊的滑塊還是右邊的滑塊;
- 鼠標(biāo)的click事件和mousedown事件要兼容好,這里統(tǒng)一使用的是mousedown事件;
- 要確定好左右滑塊的最大最小 left 值;
- 滑塊條的顯示就很簡單了,寬度是左、右滑塊的定位差值,left值是左滑塊的left值;
- 因?yàn)槭褂昧耸录袡C(jī)制,而在mousemove和mouseup事件中,無法判斷當(dāng)前操作的是哪一個(gè)滑塊,所以要在鼠標(biāo)按下時(shí),將當(dāng)前操作的對(duì)象傳到mousemove事件中;
下面附上代碼:
html結(jié)構(gòu),實(shí)例化滑塊,可以設(shè)置當(dāng)前滑塊的區(qū)間范圍:
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<!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(){ //參數(shù)為最大范圍,不傳的話默認(rèn)是4000 let slide=new Slide(4200); slide.appendTo("body"); } </ script > </ body > </ html > |
Slide.js文件:完成創(chuàng)建滑塊,拖動(dòng)滑塊,點(diǎn)擊滑塊的功能。
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import Utils from "./Utils.js" ; export default class Slide{ static styleCss= false ; //最小范圍 minNum=0; //最大范圍 maxNum; //左邊按鈕的left值 leftBtnLeft=0; //右邊按鈕的left值 rightBtnLeft=238; constructor(_max=4000){ //最大值默認(rèn)為4000 this .maxNum=_max; this .elem= this .createElem(); } createElem(){ if ( this .elem) return this .elem; //創(chuàng)建最外層容器 let div=Utils.createE( "div" ); div.className= "slideContainer" ; div.innerHTML=`<p class= "priceTxt" >價(jià)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 ); //設(shè)置樣式 Slide.setStyles(); //給父元素監(jiān)聽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()返回的結(jié)果中,width height 都是包含border的 let rect= this .rangeContainer.getBoundingClientRect(); switch (e.type) { case "mousedown" : //取消鼠標(biāo)快速拖動(dòng)的默認(rèn)事件 e.preventDefault(); this .x = e.offsetX; this .btnType=e.target.id; //如果點(diǎn)擊的是背景條,執(zhí)行rangeClick函數(shù) if (/Range/.test( this .btnType)){ e.stopPropagation(); //點(diǎn)擊函數(shù) this .rangeClick(e); return ; } //如果點(diǎn)擊的是按鈕,監(jiān)聽document鼠標(biāo)移動(dòng)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; //獲取左右按鈕的left值 this .leftBtnLeft=parseInt(getComputedStyle( this .leftBtn).left); this .rightBtnLeft=parseInt(getComputedStyle( this .rightBtn).left); if ( this .btnType === "leftBtn" ) { //確定左邊按鈕的取值范圍 if (x < 0) x = 0; if (x > this .rightBtnLeft) x = this .rightBtnLeft; this .leftBtn.style.left = x + "px" ; } else if ( this .btnType === "rightBtn" ) { //確定右邊按鈕的取值范圍,減去1px邊框 if (x < this .leftBtnLeft) x = this .leftBtnLeft; if (x > this .bgRange.offsetWidth - 2) x = this .bgRange.offsetWidth - 2; this .rightBtn.style.left = x + "px" ; } //文字范圍顯示 this .changeRangeText(); break ; case "mouseup" : //移動(dòng)事件監(jiān)聽 document.removeEventListener( "mousemove" , this .mouseHandlers); document.removeEventListener( "mouseup" , this .mouseHandlers); break ; } } rangeClick(e){ //計(jì)算出鼠標(biāo)點(diǎn)擊位置的值 let click_X=e.clientX- this .rangeContainer.getBoundingClientRect().x- this .leftBtn.offsetWidth/2; //判斷,如果當(dāng)前點(diǎn)擊的位置是在左邊按鈕的左側(cè)、或者當(dāng)左右按鈕重疊時(shí),點(diǎn)擊的位置在按鈕左側(cè),讓左邊按鈕移動(dòng)到鼠標(biāo)點(diǎn)擊的位置 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" ; //否則,讓右邊按鈕移動(dòng)到鼠標(biāo)點(diǎn)擊的位置 else this .rightBtn.style.left=click_X+ "px" ; //獲取移動(dòng)后的左右按鈕的left值 this .leftBtnLeft=parseInt(getComputedStyle( this .leftBtn).left); this .rightBtnLeft=parseInt(getComputedStyle( this .rightBtn).left); //文字范圍顯示 this .changeRangeText(); } changeRangeText(){ //計(jì)算出最小范圍與最大范圍的值,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}`; //滑塊顏色的改變 this .changeRangeSlide(); } changeRangeSlide(){ //滑塊寬度等于左右按鈕間的距離 this .priceRange.style.width= this .rightBtnLeft- this .leftBtnLeft+ "px" ; //滑塊的left值等于左邊按鈕的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:是一個(gè)工具包文件。
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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); } } } |
以上就是本文的全部內(nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持服務(wù)器之家。
原文鏈接:https://blog.csdn.net/Charissa2017/article/details/104099156