JavaScript实现最简单的拖拽效果
来源：互联网 发布：mac mini387 拆机 编辑：程序博客网 时间：2024/06/10 02:07
var params = {left: 0,top: 0,currentX: 0,currentY: 0,flag: false};var getCss = function(o,key){return o.currentStyle? o.currentStyle[key] : document.defaultView.getComputedStyle(o,false)[key]; };var startDrag = function(bar, target, callback){if(getCss(target, "left") !== "auto"){params.left = getCss(target, "left");}if(getCss(target, "top") !== "auto"){params.top = getCss(target, "top");}bar.onmousedown = function(event){params.flag = true;if(!event){event = window.event;<style type="text/css">#box{position:absolute; left:100px; top:100px; padding:5px; background:#f0f3f9; font-size:12px; -moz-box-shadow:2px 2px 4px #666666; -webkit-box-shadow:2px 2px 4px #666666;}#main{border:1px solid #a0b3d6; background:white;}#bar{line-height:24px; background:#beceeb; border-bottom:1px solid #a0b3d6; padding-left:5px; cursor:move;}#content{width:420px; height:250px; padding:10px 5px;}</style><div id="box"> <div id="main"> <div id="bar">拖拽</div> <div id="content"> 内容…… </div> </div></div>
<script type="text/javascript"> var oBox = document.getElementById("box"); var oBar = document.getElementById("bar"); startDrag(oBar, oBox);</script>
bar.onselectstart = function(){return false;} }var e = event;params.currentX = e.clientX;params.currentY = e.clientY;};document.onmouseup = function(){params.flag = false;if(getCss(target, "left") !== "auto"){params.left = getCss(target, "left");}if(getCss(target, "top") !== "auto"){params.top = getCss(target, "top");}};document.onmousemove = function(event){var e = event ? event: window.event;if(params.flag){var nowX = e.clientX, nowY = e.clientY;var disX = nowX - params.currentX, disY = nowY - params.currentY;target.style.left = parseInt(params.left) + disX + "px";target.style.top = parseInt(params.top) + disY + "px";}if (typeof callback == "function") {callback(parseInt(params.left) + disX, parseInt(params.top) + disY);}}};
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