一个很不错的js拖动单一div案例
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Div拖动/调整大小实例</title>
</head>
<script type="text/javascript">
//保留的位置
var saveLeft,saveTop,saveWidth,saveHeight;
var theBody;
var eventType; //事件种类, "move"、"resize"
var div;
//创建并设定div的参数
function setDiv()
{
//防止重复打开
if (div)
{
return;
}
var newLeft,newTop,newWidth,newHeight;
theBody = document.body;
div = document.createElement("div");
div.id = "panelDiv";
div.style.position = "absolute";
div.style.backgroundColor = "#E5E5E5"
div.style.padding = "2px 5px 5px 2px";
div.style.overflow = "hidden";
div.style.zIndex = 1;
//设定打开的大小和位置
Function()
{
var openType = document.getElementById("radio1").checked ? 0 : 1;
if (openType == 0) //默认大小默认位置居中打开
{
newWidth = "300px";
newHeight = "300px";
newLeft = (theBody.clientWidth - parseInt(newWidth)) / 2 + "px";
newTop = (theBody.clientHeight - parseInt(newHeight)) / 2 + "px";
}
else //存储的位置与大小
{
newWidth = saveWidth ? saveWidth : "300px";
newHeight = saveHeight ? saveHeight : "300px";
newLeft = saveLeft ? saveLeft : (theBody.clientWidth - parseInt(newWidth)) / 2 + "px";
newTop = saveTop ? saveTop : (theBody.clientHeight - parseInt(newHeight)) / 2 + "px";
}
div.style.width = newWidth;
div.style.height = newHeight;
div.style.left = newLeft;
div.style.top = newTop;
}
div = setChild(div);
theBody.appendChild(div);
var ipt = document.getElementsByTagName("input");
for(var i = 0; i < ipt.length; i++)
{
ipt.disabled = true;
}
}
function setChild(div)
{
//可否移动、调整
var isMove = document.getElementById("isMove").checked;
var isResize = document.getElementById("isResize").checked;
//底色
var cDiv = document.createElement;
var backDiv = cDiv("div");
backDiv.style.cssText = "left: 0px; top: 0px; width: 100%; height: 100%; background-color: #F5F5F5;";
div.appendChild(backDiv);
//标题
var topDiv = cDiv("div");
topDiv.style.cssText = "left: 2px; top: 2px; width: 100%; height: 30px; position: absolute; background-color: #78ABFF; vertical-align: middle; z-index: 5";
if (isMove)
{
topDiv.style.cursor = "move";
topDiv.setAttribute("onmousedown", function(){setMove(this)});
}
else
{
topDiv.style.cursor = "default";
}
topDiv.innerHTML = "<span style='top: 5px; left:5px; font-size: 20px; font-weight: bold; color: #102548; position: relative;' onselectstart='return false'>标题栏</span>";
div.appendChild(topDiv);
//关闭按钮
var closeDiv = cDiv("div");
closeDiv.style.cssText = "right: 8px; top : 5px; width: 24px; height: 24px; position: absolute; background-color: #E4EEFF; border: #2D66C4 1px solid; text-align: center; vertical-align: middle; cursor: pointer; z-index: 10";
closeDiv.setAttribute("onclick", function() {eCloseDiv()});
closeDiv.innerHTML = "<span style='font-size: 20px; font-weight: bold; color: #0E377A;' title='Esc快捷键'>×</span>";
div.appendChild(closeDiv);
//内容
var contentDiv = cDiv("div");
contentDiv.style.cssText = "left: 2px; top: 35px; width: 100%; position: absolute; overflow: auto";
contentDiv.style.height = (parseInt(div.style.height) - 40) + "px";
contentDiv.innerHTML = "<table style='width: 100%; height: 100%; text-align: center; vertical-align: hidden'><tr><td><p>这里是内容区！</p><a href='javascript:saveDiv()'>保留这个位置和大小</a></td></tr></table>";
div.appendChild(contentDiv);
//调整大小
var reDiv = cDiv("div");
reDiv.style.cssText = "right: 0px; bottom: 0px; width: 5px; height: 5px; position: absolute;";
if (isResize)
{
reDiv.style.cursor = "se-resize";
reDiv.setAttribute("onmousedown", function(){setResize(this)});
}
else
{
reDiv.style.cursor = "default";
}
div.appendChild(reDiv);
return div;
}
var oX, oY, oLeft, oTop, oWidth, oHeight; //存储原始移动前的位置
var divClone, oDiv; //克隆的节点和原始节点
var oTime;
//clone拖移的节点
function setMove(obj)
{
if (event.button == 1)
{
if (oTime)
{
clearTimeout(oTime);
divClone.parentNode.removeChild(divClone);
}
oDiv = obj.parentNode;
divClone = oDiv.cloneNode(true);
divClone.style.filter = "Alpha(opacity=50)";
divClone.childNodes[1].setAttribute("onmousemove", function(){startMove(this)});
divClone.childNodes[1].setAttribute("onmouseup", function(){endMove()});
oX = parseInt(event.clientX);
oY = parseInt(event.clientY);
oLeft = parseInt(divClone.style.left);
oTop = parseInt(divClone.style.top);
document.body.appendChild(divClone);
divClone.childNodes[1].setCapture();
eventType = "move";
}
}
//拖移
function startMove(obj)
{
if (eventType == "move" && event.button == 1)
{
var moveDiv = obj.parentNode;
moveDiv.style.left = (oLeft + event.clientX - oX) + "px";
moveDiv.style.top = (oTop + event.clientY - oY) + "px";
}
}
//拖移结束调用动画
function endMove()
{
if (eventType == "move")
{
divClone.childNodes[1].releaseCapture();
move(parseInt(divClone.style.left), parseInt(divClone.style.top));
eventType = "";
}
}
//移动的动画
function move(aimLeft, aimTop)
{
var nowLeft = parseInt(oDiv.style.left);
var nowTop = parseInt(oDiv.style.top);
var moveSize = 30;
if (nowLeft > aimLeft + moveSize || nowLeft < aimLeft - moveSize || nowTop > aimTop + moveSize || nowTop < aimTop - moveSize)
{
oDiv.style.left = aimLeft > nowLeft + moveSize ? (nowLeft + moveSize) + "px" : aimLeft < nowLeft - moveSize ? (nowLeft - moveSize) + "px" : nowLeft + "px";
oDiv.style.top = aimTop > nowTop + moveSize ? (nowTop + moveSize) + "px" : aimTop < nowTop - moveSize ? (nowTop - moveSize) + "px" : nowTop + "px";
oTime = setTimeout("move(" + aimLeft + ", " + aimTop + ")", 1);
}
else
{
oDiv.style.left = divClone.style.left;
oDiv.style.top = divClone.style.top;
divClone.parentNode.removeChild(divClone);
divClone == null;
}
}
//clone调整大小的节点
function setResize(obj)
{
if (event.button == 1)
{
if (oTime)
{
clearTimeout(oTime);
divClone.parentNode.removeChild(divClone);
}
oDiv = obj.parentNode;
divClone = oDiv.cloneNode(true);
divClone.style.filter = "Alpha(opacity=50)";
divClone.childNodes[4].setAttribute("onmousemove", function(){startResize(this)});
divClone.childNodes[4].setAttribute("onmouseup", function(){endResize()});
oX = parseInt(event.clientX);
oY = parseInt(event.clientY);
oWidth = parseInt(divClone.style.width);
oHeight = parseInt(divClone.style.height);
document.body.appendChild(divClone);
divClone.childNodes[4].setCapture();
eventType = "resize";
}
}
//拖动调整大小
function startResize(obj)
{
if (eventType == "resize" && event.button == 1)
{
var nX = event.clientX;
var nY = event.clientY;
if (nX > oX - oWidth && nY > oY - oHeight + 40)
{
var resizeDiv = obj.parentNode;
resizeDiv.style.width = (oWidth + event.clientX - oX) + "px";
resizeDiv.style.height = (oHeight + event.clientY - oY) + "px";
resizeDiv.childNodes[3].style.height = (parseInt(resizeDiv.style.height) - 40) + "px";
}
}
}
//调整大小结束
function endResize()
{
if (eventType == "resize")
{
divClone.childNodes[4].releaseCapture();
resize(parseInt(divClone.style.width), parseInt(divClone.style.height));
eventType = "";
}
}
//调整大小的动画
function resize(aimWidth, aimHeight)
{
var nowWidth = parseInt(oDiv.style.width);
var nowHeight = parseInt(oDiv.style.height);
var resizeSize = 30;
if (nowWidth > aimWidth + resizeSize || nowWidth < aimWidth - resizeSize || nowHeight > aimHeight + resizeSize || nowHeight < aimHeight - resizeSize)
{
oDiv.style.width = aimWidth > nowWidth + resizeSize ? (nowWidth + resizeSize) + "px" : aimWidth < nowWidth - resizeSize ? (nowWidth - resizeSize) + "px" : nowWidth + "px";
oDiv.style.height = aimHeight > nowHeight + resizeSize ? (nowHeight + resizeSize) + "px" : aimHeight < nowHeight - resizeSize ? (nowHeight - resizeSize) + "px" : nowHeight + "px";
oDiv.childNodes[3].style.height = (parseInt(oDiv.style.height) - 40) + "px";
oTime = setTimeout("resize(" + aimWidth + ", " + aimHeight + ")", 1);
}
else
{
oDiv.style.width = divClone.style.width;
oDiv.style.height = divClone.style.height;
oDiv.childNodes[3].style.height = (parseInt(oDiv.style.height) - 40) + "px";
divClone.parentNode.removeChild(divClone);
divClone == null;
}
}
//关闭DIV
function eCloseDiv()
{
if (div)
{
div.parentNode.removeChild(div);
var ipt = document.getElementsByTagName("input");
for(var i = 0; i < ipt.length; i++)
{
ipt.disabled = false;
}
div = null;
}
}
//保留位置和大小
function saveDiv()
{
if (div)
{
saveLeft = div.style.left;
saveTop = div.style.top;
saveWidth = div.style.width;
saveHeight = div.style.height;
alert("保留成功！");
}
}
//快捷键
document.onkeydown = function()
{
event.keyCode == 27 ? eCloseDiv() : null; //Esc快捷键
event.ctrlKey && (event.keyCode == 83 || event.keyCode == 115) ? saveDiv() : null; //ctrl+s保存位置
event.ctrlKey && event.keyCode == 13 ? setDiv() : null //ctrl+enter打开Div
!event.ctrlKey && (event.keyCode == 37 || event.keyCode == 38 || event.keyCode == 39 || event.keyCode == 40) ? arrowMove(event.keyCode) : null;
event.ctrlKey && (event.keyCode == 37 || event.keyCode == 38 || event.keyCode == 39 || event.keyCode == 40) ? arrowResize(event.keyCode) : null;
}
//上下左右箭头移动div
function arrowMove(eKeyCode)
{
if (div)
{
var isMove = document.getElementById("isMove").checked;
if (isMove)
{
switch(eKeyCode)
{
case 37:
div.style.left = (parseInt(div.style.left) - 1) + "px"; //left
break
case 38:
div.style.top = (parseInt(div.style.top) - 1) + "px"; //up
break
case 39:
div.style.left = (parseInt(div.style.left) + 1) + "px"; //right
break
case 40:
div.style.top = (parseInt(div.style.top) + 1) + "px"; //down
break
}
}
}
}
//ctrl+上下左右箭头调整div大小
function arrowResize(eKeyCode)
{
if (div)
{
var isResize = document.getElementById("isResize").checked;
if (isResize)
{
switch(eKeyCode)
{
case 37:
div.style.width = (parseInt(div.style.width) - 1) + "px"; //left
break
case 38:
div.style.height = (parseInt(div.style.height) - 1) + "px"; //up
break
case 39:
div.style.width = (parseInt(div.style.width) + 1) + "px"; //right
break
case 40:
div.style.height = (parseInt(div.style.height) + 1) + "px"; //down
break
}
}
}
}
</script>
<body>
<p>
<input type="checkbox" id="isMove" /><label for="isMove">可移动</label>
<input type="checkbox" id="isResize" /><label for="isResize">可调整大小</label>
</p>
<p>
<input type="radio" name="radio" id="radio1" checked /><label for="radio1">默认居中打开</label>
<input type="radio" name="radio" id="radio2" /><label for="radio2">保留位置上打开</label>
</p>
<p><a href="javascript:setDiv()">打开DIV</a></p>
<p style="font-weight: bold">操作说明：</p>
<ol>
<li>
选中复选框（可移动、可调整大小）后，打开的DIV具有移动/调整大小的功能(此时移动/调整大小快捷键可使用);<br>
反之，不可移动/调整大小(此时移动/调整大小快捷键无效)
</li>
<li>
单选框默认居中打开选中，无论有无保存DIV位置和大小均以默认位置及大小打开DIV
</li>
<li>
单选框保留位置上打开选中，如果未发现保存记录以默认方式打开，否则以保存的位置及大小打开
</li>
<li>
如果选中可移动后，鼠标经过标题位置（蓝色背景）处会变成移动的图标，此时按住鼠标左键会产生一个半透明的DIV，按住鼠标不动拉动此半透明DIV会跟随移动，释放鼠标左键后会产生一段原始位置移动至半透明位置的动画，当动画重叠时，半透明的DIV将回收。
</li>
<li>
如果选中可调整大小后，鼠标经过整个DIV的最右下角处会变成伸缩的图标，此时按住鼠标左键会产生一个半透明的DIV，按住鼠标不动拉动此半透明DIV会随着移动而调整大小，释放鼠标左键后会产生一段原始大小伸缩至半透明大小的动画，当动画重叠时，半透明的DIV将回收。
</li>
<li>
DIV的右上角有关闭按钮，按下后DIV将remove
</li>
</ol>
<p style="font-weight: bold">
快捷键说明：
<ol>
<li>
Ctrl + Enter : 打开div
</li>
<li>
Ctrl + s(大小写均可) : 保存div的大小和位置
</li>
<li>
上下左右箭头 : 轻移div位置
</li>
<li>
Ctrl + 上下左右箭头 : 轻调div大小
</li>
<li>
Esc : 关闭Div
</li>
</ol>
</p>
</body>
</html>
