一个基于JavaScript技术的照片墙实例演示,使用鼠标拖动图片可为图片换位置，可随机打乱图片顺序。使用时先准备好一定序列编号的图片集，设定JavaScript代码内的路径，程序会自动读取图片，记得不要让循环溢出哦，那样会出错的。
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
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<html xmlns="">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>JavaScript照片墙实例演示</title>
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<style type="text/css">
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body,div,h2,ul,li{margin:0;padding:0;}
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body{font:12px/1.5 Arail;}
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.box{width:860px;margin:10px auto;background:#eee;border:1px solid #b8b8b8;overflow:hidden}
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.title{height:30px;line-height:30px;font-size:14px;padding:0 15px 0 35px;border-bottom:1px solid #b8b8b8;background:#fafafa;}
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.title span{float:left;}
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.title a{float:right;color:#06f;outline:none;}
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.title a:hover{color:red;}
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.box ul{float:left;padding:0 15px 15px 0;}
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.box li{float:left;width:140px;height:105px;padding:6px;background:#fff;border:1px solid #c3c3c3;display:inline;margin:15px 0 0 15px;list-style:none;}
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.box li img{float:left;width:140px;height:105px;}
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.box li.hig{padding:5px;border:2px dashed #f30;opacity:0.5;filter:alpha(opacity=50);}
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</style>
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<script type="text/javascript">
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//获取ID
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var $ = function (id) {return typeof id === "string" ? document.getElementById(id) : id};
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//获取tagName
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var $$ = function (tagName, oParent) {return (oParent || document).getElementsByTagName(tagName)};
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//获取class
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var $$$ = function (sClass, oParent) {
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var aClass = [],
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i = 0,
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reClass = new RegExp("(\\s|^)" + sClass + "($|\\s)"),
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aElement = $$("*", oParent);
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for (i = 0; i < aElement.length; i++)reClass.test(aElement[i].className) && aClass.push(aElement[i]);
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return aClass
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};
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//获取元素位置
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function getPos(obj) {
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var iTop = obj.offsetTop;
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var iLeft = obj.offsetLeft;
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while (obj.offsetParent)
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{
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iTop += obj.offsetParent.offsetTop;
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iLeft += obj.offsetParent.offsetLeft;
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obj = obj.offsetParent;
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}
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return {top:iTop, left:iLeft}
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};
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//创建照片墙对象
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var PhotoWall = function () {this.initialize.apply(this, arguments)};
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PhotoWall.prototype = {
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initialize: function (obj, aData)
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{
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var oThis = this;
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this.oParent = $(obj);
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this.oUl = $$("ul", this.oParent)[0];
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this.oBtn = $$("a", this.oParent)[0];
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this.zIndex = 1;
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this.aPos = [];
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this.aData = aData;
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this.dom = document.documentElement || document.body;
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this.create();
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this.oBtn.onclick = function () {oThis.randomOrder()}
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},
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create: function ()
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{
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var aFrag = document.createDocumentFragment();
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var i = 0;
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for (i = 0; i < this.aData.length; i++)
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{
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var oLi = document.createElement("li");
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var oImg = document.createElement("img");
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oImg.src = this.aData[i];
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oLi.appendChild(oImg);
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aFrag.appendChild(oLi)
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}
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this.oUl.appendChild(aFrag);
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this.aLi = $$("li", this.oParent);
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this.changeLayout()
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},
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changeLayout: function ()
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{
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var i = 0;
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this.oParent.style.height = this.oParent.offsetHeight - 2 + "px";
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this.aPos.length = 0;
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for (i = 0; i < this.aLi.length; i++) this.aLi[i].style.cssText = "";
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for (i = 0; i < this.aLi.length; i++)
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{
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this.aLi[i].index = i;
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this.aLi[i].style.top = getPos(this.aLi[i]).top + "px";
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this.aLi[i].style.left = getPos(this.aLi[i]).left + "px";
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this.aPos.push({left:getPos(this.aLi[i]).left, top:getPos(this.aLi[i]).top})
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}
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for (i = 0; i < this.aLi.length; i++)
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{
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this.aLi[i].style.position = "absolute";
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this.aLi[i].style.margin = "0";
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this.drag(this.aLi[i])
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}
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},
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drag: function (obj, handle)
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{
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var oThis = this;
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var handle = handle || obj;
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handle.style.cursor = "move";
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handle.onmousedown = function (event)
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{
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var event = event || window.event;
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var disX = event.clientX - this.offsetLeft;
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var disY = event.clientY - this.offsetTop;
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var oNear = null;
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handle.style.zIndex = oThis.zIndex++;
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document.onmousemove = function (event)
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{
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var event = event || window.event;
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var iL = event.clientX - disX;
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var iT = event.clientY - disY;
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var maxL = Math.max(oThis.dom.clientWidth, oThis.dom.scrollWidth) - handle.offsetWidth;
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var maxT = Math.max(oThis.dom.clientHeight, oThis.dom.scrollHeight) - handle.offsetHeight;
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iL < 0 && (iL = 0);
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iT < 0 && (iT = 0);
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iL > maxL && (iL = maxL);
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iT > maxT && (iT = maxT);
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handle.style.left = iL + "px";
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handle.style.top = iT + "px";
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oNear = oThis.findNearest(obj);
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for (var i = 0; i < oThis.aLi.length; i++) oThis.aLi[i].className = "";
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oNear && (oNear.className = "hig");
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return false
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};
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document.onmouseup = function ()
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{
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document.onmousemove = null;
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document.onmouseup = null;
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if (oNear)
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{
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handle.index = [handle.index, oNear.index];
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oNear.index = handle.index[0];
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handle.index = handle.index[1];
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oNear.style.zIndex = oThis.zIndex++;
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oThis.doMove(handle, oThis.aPos[handle.index]);
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oThis.doMove(oNear, oThis.aPos[oNear.index]);
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oNear.className = "";
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}
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else
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{
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oThis.doMove(handle, oThis.aPos[handle.index])
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}
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handle.releaseCapture && handle.releaseCapture()
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};
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this.setCapture && this.setCapture();
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return false
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};
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},
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doMove: function (obj, iTarget, callback)
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{
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var oThis = this;
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clearInterval(obj.timer);
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obj.timer = setInterval(function ()
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{
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var iCurL = getPos(obj).left;
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var iCurT = getPos(obj).top;
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var iSpeedL = (iTarget.left - iCurL) / 5;
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var iSpeedT = (iTarget.top - iCurT) / 5;
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iSpeedL = iSpeedL > 0 ? Math.ceil(iSpeedL) : Math.floor(iSpeedL);
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iSpeedT = iSpeedT > 0 ? Math.ceil(iSpeedT) : Math.floor(iSpeedT);
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if (iCurL == iTarget.left && iCurT == iTarget.top)
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{
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clearInterval(obj.timer);
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callback && callback()
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}
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else
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{
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obj.style.left = iCurL + iSpeedL + "px";
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obj.style.top = iCurT + iSpeedT + "px"
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}
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}, 30)
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},
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findNearest: function (obj)
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{
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var aDistance = [];
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var i = 0;
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for (i = 0; i < this.aLi.length; i++) aDistance[i] = this.aLi[i] == obj ? Number.MAX_VALUE : this.getDistance(obj, this.aLi[i]);
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var minNum = Number.MAX_VALUE;
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var minIndex = -1;
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for (i = 0; i < aDistance.length; i++) aDistance[i] < minNum && (minNum = aDistance[i], minIndex = i);
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return this.isButt(obj, this.aLi[minIndex]) ? this.aLi[minIndex] : null
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},
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getDistance: function(obj1, obj2)
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{
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var a = (obj1.offsetLeft + obj1.offsetWidth / 2) - (obj2.offsetLeft + obj2.offsetWidth / 2);
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var b = (obj1.offsetTop + obj1.offsetTop / 2) - (obj2.offsetTop + obj2.offsetTop / 2);
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return Math.sqrt(a * a + b * b)
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},
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isButt: function (obj1, obj2)
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{
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var l1 = obj1.offsetLeft;
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var t1 = obj1.offsetTop;
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var r1 = l1 + obj1.offsetWidth;
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var b1 = t1 + obj1.offsetHeight;
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var l2 = obj2.offsetLeft;
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var t2 = obj2.offsetTop;
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var r2 = l2 + obj2.offsetWidth;
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var b2 = t2 + obj2.offsetHeight;
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return !(r1 < l2 || b1 < t2 || r2 < l1 || b2 < t1)
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},
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randomOrder: function ()
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{
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this.aPos.sort(function () {return Math.random() > 0.5 ? 1 : -1});
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for (var i = 0; i < this.aLi.length; i++)
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{
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this.aLi[i].index = i;
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this.doMove(this.aLi[i], this.aPos[i])
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}
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}
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};
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window.onload = function ()
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{
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var aBox = $$$("box");
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var aData = [];
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var aExample = [];
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var i = 0;
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//生成图片数据
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for (i = 1; i < 9; i++) aData[aData.length] = "" + i + ".jpg";
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//循环创建多个实例
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for (i = 0; i < aBox.length; i++)
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{
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var oExample = new PhotoWall(aBox[i], aData);
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aExample.push(oExample)
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}
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this.onresize = function ()
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{
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for (var p in aExample) aExample[p].changeLayout()
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};
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this.onresize()
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};
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</script>
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</head>
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<body>
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<div class="box">
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<h2 class="title"><span>一堆90后</span><a href="javascript:;" class="order">随机排序</a></h2>
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<ul></ul>
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</div>
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<div class="box">
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<h2 class="title"><span>一堆90后</span><a href="javascript:;" class="order">随机排序</a></h2>
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<ul></ul>
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</div>
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</body>
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</html>
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