//1、让所有的li(在ul里)可以拖拽
//2、交换li的位置 计算背景图位置
//1、让所有的li(在ul里)可以拖拽
//根据鼠标的位置,计算目标li的序号
//根据行号和列号计算下标
//行号*3+列号
//2、归位
此处没有背景图 请自行添加 css样式
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> html,body{ margin:0; padding:0; } #box{ list-style:none; position:relative; width:600px; height:600px; box-sizing:border-box; margin:10px auto; } li{ position:absolute; width:200px; height:200px; border:1px solid white; background-image:url(img/b1.jpg); background-size:600px 600px; } #box li:nth-child(1){ left:0px; top:0px; background-position:0px 0px; } #box li:nth-child(2){ left:200px; top:0px; background-position:-200px 0px; } #box li:nth-child(3){ left:400px; top:0px; background-position:-400px 0px; } #box li:nth-child(4){ left:0px; top:200px; background-position:0px -200px; } #box li:nth-child(5){ left:200px; top:200px; background-position:-200px -200px; } #box li:nth-child(6){ left:400px; top:200px; background-position:-400px -200px; } #box li:nth-child(7){ left:0px; top:400px; background-position:0px -400px; } #box li:nth-child(8){ left:200px; top:400px; background-position:-200px -400px; } #box li:nth-child(9){ left:400px; top:400px; background-position:-400px -400px; } </style> </head> <body> <ul> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> </ul> </body> </html>
<script type="text/javascript" src="https://www.jb51.net/js/cssTools.js"></script> <script type="text/javascript" src="https://www.jb51.net/js/eventTools.js"></script>
这个是这连个js连接的代码
//csstools //功能:获取某个DOM元素的样式属性的兼容性写法 //参数:dom元素,样式属性名 //返回值:样式属性的值 function getStyle(domObj,attr){ if(domObj.currentStyle){//domObj.currentStyle如果能够正确获取到,那就真 return domObj.currentStyle[attr];//当对象的属性名是变量时,用方括号而不是点。 }else{ return window.getComputedStyle(domObj)[attr]; } }
//eventTools //功能:阻止浏览器默认行为的封装 //参数:事件对象 //返回值:无 function preventDefault1809(evt) { if(evt.returnValue){ evt.returnValue = false; }else{ evt.preventDefault(); } } //功能:绑定事件 //参数: //事件源 //事件类型名,不带on //事件处理函数, //是否冒泡 //返回值:无 function addEvent1809(domObj,eventType,func,isBubble){ if(domObj.addEventListener){ domObj.addEventListener(eventType,func,isBubble); }else if(domObj.attachEvent){ domObj.attachEvent('on'+eventType,func); }else{ domObj['on'+eventType] = func; } } //当对象的属性是变量时,不能用点,只能用方括号 /* var obj = { id:'007' } obj.id; var temp = "id"; obj[temp] */
js部分
<script type="text/javascript"> function $(id){ return document.getElementById(id); } window.onload = function(){ drag(); } //1、让所有的li(在ul里)可以拖拽 function drag(){ var lis = $("box").children; var currIndex = -1;//记录被按下的那个li var targetIndex = -1; for(var i=0;i<lis.length;i++){ lis[i].setAttribute("index",i); lis[i].onmousedown = function(event){ currIndex = this.getAttribute("index"); var evt = event || window.event; var offsetX = evt.offsetX; var offsetY = evt.offsetY; this.style.zIndex = 1; var liDom = this; $("box").onmousemove = function(event){ var evt = event || window.event; //1、数据距离大盒子左上角的距离 var mouseX = evt.pageX-$("box").offsetLeft; var mouseY = evt.pageY-$("box").offsetTop; //鼠标距离页面左边的距离- 大盒子距离页面左边的距离-鼠标距离事件源的左边距离 var left1 = mouseX-offsetX; var top1 = mouseY-offsetY; //li不能拖拽到界外(大盒子外面) if(left1<0 || left1>600-200 || top1<0 || top1>600-200 ){ return; } liDom.style.left = left1+"px"; liDom.style.top = top1+"px"; targetIndex = getTargetIndex(mouseX,mouseY); console.log(targetIndex); } } document.body.onmouseup = function(){ $("box").onmousemove = null; if(currIndex>-1){ lis[currIndex].style.zIndex = 0; exchangeLi(currIndex,targetIndex); } } } } //根据鼠标的位置,计算目标li的序号 function getTargetIndex(x,y){ //计算行号 var rowIndex = parseInt(y/200);// //计算列号 var colIndex = parseInt(x/200);// //根据行号和列号计算下标 //行号*3+列号 return rowIndex*3+colIndex; } function exchangeLi(sourceIndex,targetIndex){ // var lis = $("box").children; // if(sourceIndex<-1 || sourceIndex>lis.length-1 || targetIndex<-1 || targetIndex>lis.length-1){ // return; // } if(sourceIndex!=targetIndex){ var lis = $("box").children; //1、交换backgroundPosition var temp =getStyle(lis[sourceIndex],"backgroundPosition"); lis[sourceIndex].style.backgroundPosition = getStyle(lis[targetIndex],"backgroundPosition"); lis[targetIndex].style.backgroundPosition = temp; } //2、归位 rowIndex = parseInt(sourceIndex/3); colIndex = sourceIndex%3; lis[sourceIndex].style.left = colIndex*200+"px"; lis[sourceIndex].style.top = rowIndex*200+"px"; } </script>
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