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基于原生js实现九宫格算法代码实例

浏览:36日期:2024-05-01 15:14:20

九宫格算法核心:

利用控件索引index计算出控件所在的行数和列数; 利用控件计算出left距离; 利用控件计算出top距离; 写特效时需要用到定位

公式:

行 row=parseInt(i/cols);

列 col=parseInt(i%cols);

i是当前的盒子,cols是总列数,

代码示例:

<!DOCTYPE html><html lang='en'> <head> <meta charset='UTF-8'> <title>九宫格</title> <style> *{padding: 0;margin: 0; } #top{margin-top:30px;margin-bottom: 20px;margin-left:20px; } #bottom{position: relative; } #bottom .content{width: 220px;height: 360px;background-color: skyblue;margin: 0 0 15px 15px;padding: 5px; } .content img{width: 220px;height: 308px; } #bottom .content p:last-child{font-size: 15px;color: red; } </style> </head> <body> <div id='top'> <button>排成三列</button> <button>排成四列</button> <button>排成五列</button> </div> <div id='bottom'> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> <div class='content'> <img src='https://www.haobala.com/bcjs/images/dianying.jpg'> <p>是一部非常成功的导演处女作</p> <p>几乎全面启用新演员的做法</p> </div> </div> <script> window.onload=function(){var top=document.getElementById('top');var btns=top.getElementsByTagName('button');var content=document.getElementById('bottom');// console.log(content.children);//console.log(btns);//定义变量标识盒子的宽度和高度 var cssW=220; var cssH=360; var marginXY=15; //监听按钮点击事件btns[0].onclick=function(){ getContent(3);}btns[1].onclick=function(){ getContent(4)}btns[2].onclick=function(){ getContent(5);}function getContent(cols){ var cols; //遍历 for(var i=0;i<content.children.length;i++){ var currentCont=content.children[i]; //console.log(currentCont); //盒子所在的行 var row=parseInt(i/cols); //盒子所在的列 var col=parseInt(i%cols); //console.log('盒子在第' +row+ '行,''在第' +col+ '列'); currentCont.style.position='absolute'; currentCont.style.left=col*(cssW+marginXY)+'px'; currentCont.style.top=row*(cssH+marginXY)+'px'; }} } </script> </body></html>

九宫格(用原生js实现)

1、本文的九宫格是用原生的js实现的;

2、实现的九宫格效果是:可交换1-9的任意方格,且将方格拖拽至大盒子外松开后可自动回到拖拽之前的位置。

3、代码如下:

html代码:

<ul id='box'> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> <li>9</li></ul>

css代码:

body,div,p,h1,h2,h3,h4,h5,h6,ol,ul,li,dl,dt,dd,th,tr,td,hr,caption,table,form,img,input,legend,fieldset{ margin:0; padding:0;}html { overflow: hidden;}ul { list-style: none;}#box { position: relative; margin: 20px auto; width: 640px; height: 640px; border: 1px solid #eee;}#box li { position: absolute; width: 200px; height: 200px; line-height: 200px; text-align: center; font-size: 40px; font-weight: bold; background: #eee;}#box .active { z-index: 1; color: #fff; background: blue;}

js代码:

window.onload = function () { var oBox = document.getElementById(’box’); var aLi = oBox.children; for(var i = 0; i < aLi.length; i++) { // 布局 aLi[i].style.left = 210 * (i % 3) + 10 + ’px’; aLi[i].style.top = 210 * Math.floor(i / 3) + 10 + ’px’; // 添加拖拽功能 aLi[i].index = i; aLi[i].onmousedown = function (ev) { var e = ev || window.event; var iX = e.clientX - this.offsetLeft; var iY = e.clientY - this.offsetTop; if(this.setCapture) { this.setCapture(); } var oThat = this; // 添加class名称 this.className = ’active’; document.onmousemove = function (ev) {var e = ev || window.event;var iL = e.clientX - iX;var iT = e.clientY - iY; oThat.style.left = iL + ’px’;oThat.style.top = iT + ’px’; // 交换位置的条件for(var j = 0; j < aLi.length; j++) { if(oThat != aLi[j] && oThat.offsetLeft + oThat.offsetWidth > aLi[j].offsetLeft + aLi[j].offsetWidth / 2 && oThat.offsetTop + oThat.offsetHeight > aLi[j].offsetTop + aLi[j].offsetHeight / 2 && oThat.offsetLeft < aLi[j].offsetLeft + aLi[j].offsetWidth / 2 && oThat.offsetTop < aLi[j].offsetTop + aLi[j].offsetHeight / 2) { var iCurIndex = oThat.index; // 交换位置 aLi[j].style.left = 210 * (iCurIndex % 3) + 10 + ’px’; aLi[j].style.top = 210 * Math.floor(iCurIndex / 3) + 10 + ’px’; // 交换下标 oThat.index = aLi[j].index; aLi[j].index = iCurIndex; break; }} }; document.onmouseup = function () {document.onmousemove = null;document.onmouseup = null; if(oThat.releaseCapture) { oThat.releaseCapture();} // 去掉class名称oThat.className = ’’; // 重置当前拖拽元素的位置oThat.style.left = 210 * (oThat.index % 3) + 10 + ’px’;oThat.style.top = 210 * Math.floor(oThat.index / 3) + 10 + ’px’; }; return false; }; }};

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持好吧啦网。

标签: JavaScript
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