DIV 层的拖动问题

计算什么？
对象.style.marginLeft是左外边距的宽度。
对象.style.marginTop等

$("#floattop").position().top
$("#floattop").position().left 这样获取到该div的绝对位置, 然后就该它的值就可以啦~

拖动的窗体不要margin一定要空位的话应该是无边框的div+ padding属性 +内容然后外部的无边框的div就是拖动计算的div

<html>
<head><title>拖动效果</title>
<style>
body
{
    font-size:12px;
    color:#333333;
    border : 0px solid blue;
}
div
{
    position : absolute;
    background-color : #c3d9ff;
    margin : 0px;
    padding : 5px;
    border : 0px;
    width : 100px;
    height:100px;
}
</style>
</head>
<body>
<script>
function drag(o,s)
{
    if (typeof o == "string") o = document.getElementById(o);
    o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;
    o.orig_y = parseInt(o.style.top) - document.body.scrollTop;
    o.orig_index = o.style.zIndex;

    o.onmousedown = function(a)
    {
        this.style.cursor = "move";
        this.style.zIndex = 10000;
        var d=document;
        if(!a)a=window.event;
        var x = a.clientX+d.body.scrollLeft-o.offsetLeft;
        var y = a.clientY+d.body.scrollTop-o.offsetTop;
        //author: www.longbill.cn
        d.ondragstart = "return false;"
        d.onselectstart = "return false;"
        d.onselect = "document.selection.empty();"

        if(o.setCapture)
            o.setCapture();
        else if(window.captureEvents)
            window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);          d.onmousemove = function(a)
        {
            if(!a)a=window.event;
            o.style.left = a.clientX+document.body.scrollLeft-x;
            o.style.top = a.clientY+document.body.scrollTop-y;
            o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;
            o.orig_y = parseInt(o.style.top) - document.body.scrollTop;
        }          d.onmouseup = function()
        {
            if(o.releaseCapture)
                o.releaseCapture();
            else if(window.captureEvents)
                window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);
            d.onmousemove = null;
            d.onmouseup = null;
            d.ondragstart = null;
            d.onselectstart = null;
            d.onselect = null;
            o.style.cursor = "normal";
            o.style.zIndex = o.orig_index;
        }
    }

    if (s)
    {
        var orig_scroll = window.onscroll?window.onscroll:function (){};
        window.onscroll = function ()
        {
            orig_scroll();
            o.style.left = o.orig_x + document.body.scrollLeft;
            o.style.top = o.orig_y + document.body.scrollTop;
        }
    }
}
</script>  <div id="div1" style="left:10px;top:10px;">div1:我可以被拖动</div>
<div id="div2" style="left:120px;top:10px;background-color : #f3d9ff">div2:来拖我呀</div>
<div id="div3" style="left:230px;top:10px;background-color : #c3ffff">div3:我随便你拖</div>
<div id="div4" style="left:10px;top:120px;background-color : #c3d944">div4:我可以随窗口滑动，把我拖到最下面，然后滚动网页看看</div>
<div id="div5" style="left:120px;top:120px;background-color : #f3d944">作者: Longbill
<a href=http://www.longbill.cn target=_blank>www.longbill.cn</a>
</div>
<div id="div6" style="left:230px;top:120px;background-color : #e3f944;width:200px;">参数说明:

drag(obj [,scroll]);

obj:对象的id或对象本身;

scroll(可选):对象是否随窗口拖动而滑动，默认为否

鼠标右键查看源代码
</div>
<script>
drag("div1");
drag("div2");
drag("div3");
drag("div4",1);
drag("div5",1);
drag("div6",1);
</script>  </body>

拖动窗口的话，去网上下个dom-drag.js就行啦，然后调用drag方法就能拖了，网上有例子。。
我粘贴一下也行，
/**************************************************
* dom-drag.js
* 09.25.2001
* www.youngpup.net
**************************************************
* 10.28.2001 - fixed minor bug where events
* sometimes fired off the handle, not the root.
**************************************************/var Drag = { obj : null, init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
{
o.onmousedown = Drag.start; o.hmode = bSwapHorzRef ? false : true ;
o.vmode = bSwapVertRef ? false : true ; o.root = oRoot && oRoot != null ? oRoot : o ; if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px"; o.minX = typeof minX != 'undefined' ? minX : null;
o.minY = typeof minY != 'undefined' ? minY : null;
o.maxX = typeof maxX != 'undefined' ? maxX : null;
o.maxY = typeof maxY != 'undefined' ? maxY : null; o.xMapper = fXMapper ? fXMapper : null;
o.yMapper = fYMapper ? fYMapper : null; o.root.onDragStart = new Function();
o.root.onDragEnd = new Function();
o.root.onDrag = new Function();
}, start : function(e)
{
var o = Drag.obj = this;
e = Drag.fixE(e);
var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
o.root.onDragStart(x, y); o.lastMouseX = e.clientX;
o.lastMouseY = e.clientY; if (o.hmode) {
if (o.minX != null) o.minMouseX = e.clientX - x + o.minX;
if (o.maxX != null) o.maxMouseX = o.minMouseX + o.maxX - o.minX;
} else {
if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
} if (o.vmode) {
if (o.minY != null) o.minMouseY = e.clientY - y + o.minY;
if (o.maxY != null) o.maxMouseY = o.minMouseY + o.maxY - o.minY;
} else {
if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
} document.onmousemove = Drag.drag;
document.onmouseup = Drag.end; return false;
}, drag : function(e)
{
e = Drag.fixE(e);
var o = Drag.obj; var ey = e.clientY;
var ex = e.clientX;
var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
var nx, ny; if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY); nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1)); if (o.xMapper) nx = o.xMapper(y)
else if (o.yMapper) ny = o.yMapper(x) Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
Drag.obj.lastMouseX = ex;
Drag.obj.lastMouseY = ey; Drag.obj.root.onDrag(nx, ny);
return false;
}, end : function()
{
document.onmousemove = null;
document.onmouseup   = null;
Drag.obj.root.onDragEnd( parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]),
parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
Drag.obj = null;
}, fixE : function(e)
{
if (typeof e == 'undefined') e = window.event;
if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
return e;
}
};

调试易

DIV 层的拖动问题

解决方案 »