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[Web]如何利用js库dom-drag.js最简单化实现移动图层和点击实现div居上问题

2007-10-13 13:17 921 查看
实现效果如图:



1. 鼠标拖放是应用中常见的模式,www.young.net 提代了一个 JavaScript 库( dom-drag.js ),可以帮助开发人员更快实现鼠标拖放的功能。下面就给出一个应用实例大家参考:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>移动的图层,并实现图层居上</title>
<script src="dom-drag.js" type="text/javascript"></script>
<script type="text/javascript">
var div_z_index=1;
function zIndexAdd(divId)
{
var divObject=document.getElementById(divId);

div_z_index++;

divObject.style.zIndex=div_z_index;

//请注意:这里是 zIndex 千万不要写成 z-index 否则会出错的
}
</script>
</head>
<body>
<div id="mydiv1" onclick="zIndexAdd('mydiv1')" style="border: #000000 1px solid;width: 168px;height: 112px; background-color: #99ccff; position: absolute;">
<div id="div11" style="background-color: #3366ff;cursor:move; width:100%;">点我移动图层</div>
<div id="div12"><br/>我是内容,点我移不动</div>
</div>

<div id="mydiv2" onclick="zIndexAdd('mydiv2')" style="border: #000000 1px solid;width: 168px;height: 112px; background-color: #ffcc33; position: absolute;">
<div id="div21" style="background-color: #ff6600;cursor:move; width:100%;">标题</div>
<div id="div22"><br/>我是内容,点那都可以移动</div>
</div>

</body>
</html>

<script type="text/javascript">

var div_root=document.getElementById("mydiv1");
var div_handle=document.getElementById("div11");
Drag.init(div_handle,div_root); //可是是二个参数

var div_root2=document.getElementById("mydiv2");
Drag.init(div_root2); //也可以是一个参数

</script>

其中( dom-drag.js )文件我也把它复制给大家看看

/**************************************************
* 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;
}
};

在这里我没有应用CSDN 的代码折叠效果,因为这样更方便大家直接复制其源码便用,如果加了折折叠效果复制后的源码里面常常会有多余的代码。

2. 点击图层如何让他居顶的方法

<script type="text/javascript">
var div_z_index=1;
function zIndexAdd(divId)
{
var divObject=document.getElementById(divId);

div_z_index++;

divObject.style.zIndex=div_z_index;

//请注意:这里是 zIndex 千万不要写成 z-index 否则会出错的
}
</script>

然后在最外层图层调用这个方法即可了 如:onclick="zIndexAdd('mydiv1')"
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