实现1
参考文献：http://www.cnblogs.com/cloudgamer/archive/2008/11/17/Drag.html
1.1 拖放效果
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- saved from url=(0037)http://sandbox.runjs.cn/show/hbhrnv2g -->
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>
拖放效果
</title>
</head> <body> <div id="idContainer" style="position: relative;">
<div id="idDrag" style="position: absolute;">
<div id="idHandle">
</div>
</div>
</div> <input id="idReset" type="button" value="复位">
<input id="idLock" type="button" value="锁定">
<input id="idLockX" type="button" value="锁定水平">
<input id="idLockY" type="button" value="锁定垂直">
<input id="idLimit" type="button" value="范围锁定">
<input id="idLimitOff" type="button" value="取消范围锁定">
<br>
拖放状态：
<span id="idShow">
未开始
</span> <style>#idContainer{
border:10px solid #990000;
width:600px;
height:300px;
}
#idDrag{
border:5px solid #C4E3FD;
background:#C4E3FD;
width:50px;
height:50px;
top:50px;
left:50px;
}
#idHandle{
cursor:move;
height:25px;
background:#0000FF;
overflow:hidden;
}</style>
<script>//以下是实现的插件
var isIE = (document.all) ? true: false;var $ = function(id) {
return "string" == typeof id ? document.getElementById(id) : id;
};var Class = {
create: function() {
return function() {
this.initialize.apply(this, arguments);
}
}
}var Extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
}var Bind = function(object, fun) {
return function() {
return fun.apply(object, arguments);
}
}var BindAsEventListener = function(object, fun) {
return function(event) {
return fun.call(object, (event || window.event));
}
}var CurrentStyle = function(element) {
return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}function addEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.addEventListener) {
oTarget.addEventListener(sEventType, fnHandler, false);
} else if (oTarget.attachEvent) {
oTarget.attachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = fnHandler;
}
};function removeEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.removeEventListener) {
oTarget.removeEventListener(sEventType, fnHandler, false);
} else if (oTarget.detachEvent) {
oTarget.detachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = null;
}
};//拖放程序
var Drag = Class.create();
Drag.prototype = {
//拖放对象
initialize: function(drag, options) {
this.Drag = $(drag); //拖放对象
this._x = this._y = 0; //记录鼠标相对拖放对象的位置
this._marginLeft = this._marginTop = 0; //记录margin
//事件对象(用于绑定移除事件)
this._fM = BindAsEventListener(this, this.Move);
this._fS = Bind(this, this.Stop); this.SetOptions(options); this.Limit = !!this.options.Limit;
this.mxLeft = parseInt(this.options.mxLeft);
this.mxRight = parseInt(this.options.mxRight);
this.mxTop = parseInt(this.options.mxTop);
this.mxBottom = parseInt(this.options.mxBottom); this.LockX = !!this.options.LockX;
this.LockY = !!this.options.LockY;
this.Lock = !!this.options.Lock; this.onStart = this.options.onStart;
this.onMove = this.options.onMove;
this.onStop = this.options.onStop; this._Handle = $(this.options.Handle) || this.Drag;
this._mxContainer = $(this.options.mxContainer) || null; this.Drag.style.position = "absolute";
//透明
if (isIE && !!this.options.Transparent) {
//填充拖放对象
with(this._Handle.appendChild(document.createElement("div")).style) {
width = height = "100%";
backgroundColor = "#fff";
filter = "alpha(opacity:0)";
fontSize = 0;
}
}
//修正范围
this.Repair();
addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start));
},
//设置默认属性
SetOptions: function(options) {
this.options = { //默认值
Handle: "",
//设置触发对象（不设置则使用拖放对象）
Limit: false,
//是否设置范围限制(为true时下面参数有用,可以是负数)
mxLeft: 0,
//左边限制
mxRight: 9999,
//右边限制
mxTop: 0,
//上边限制
mxBottom: 9999,
//下边限制
mxContainer: "",
//指定限制在容器内
LockX: false,
//是否锁定水平方向拖放
LockY: false,
//是否锁定垂直方向拖放
Lock: false,
//是否锁定
Transparent: false,
//是否透明
onStart: function() {},
//开始移动时执行
onMove: function() {},
//移动时执行
onStop: function() {} //结束移动时执行
};
Extend(this.options, options || {});
},
//准备拖动
Start: function(oEvent) {
if (this.Lock) {
return;
}
this.Repair();
//记录鼠标相对拖放对象的位置
this._x = oEvent.clientX - this.Drag.offsetLeft;
this._y = oEvent.clientY - this.Drag.offsetTop;
//记录margin
this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0;
this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0;
//mousemove时移动 mouseup时停止
addEventHandler(document, "mousemove", this._fM);
addEventHandler(document, "mouseup", this._fS);
if (isIE) {
//焦点丢失
addEventHandler(this._Handle, "losecapture", this._fS);
//设置鼠标捕获
this._Handle.setCapture();
} else {
//焦点丢失
addEventHandler(window, "blur", this._fS);
//阻止默认动作
oEvent.preventDefault();
};
//附加程序
this.onStart();
},
//修正范围
Repair: function() {
if (this.Limit) {
//修正错误范围参数
this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth);
this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight);
//如果有容器必须设置position为relative或absolute来相对或绝对定位，并在获取offset之前设置
! this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || CurrentStyle(this._mxContainer).position == "absolute" || (this._mxContainer.style.position = "relative");
}
},
//拖动
Move: function(oEvent) {
//判断是否锁定
if (this.Lock) {
this.Stop();
return;
};
//清除选择
window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
//设置移动参数
var iLeft = oEvent.clientX - this._x,
iTop = oEvent.clientY - this._y;
//设置范围限制
if (this.Limit) {
//设置范围参数
var mxLeft = this.mxLeft,
mxRight = this.mxRight,
mxTop = this.mxTop,
mxBottom = this.mxBottom;
//如果设置了容器，再修正范围参数
if ( !! this._mxContainer) {
mxLeft = Math.max(mxLeft, 0);
mxTop = Math.max(mxTop, 0);
mxRight = Math.min(mxRight, this._mxContainer.clientWidth);
mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight);
};
//修正移动参数
iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft);
iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop);
}
//设置位置，并修正margin
if (!this.LockX) {
this.Drag.style.left = iLeft - this._marginLeft + "px";
}
if (!this.LockY) {
this.Drag.style.top = iTop - this._marginTop + "px";
}
//附加程序
this.onMove();
},
//停止拖动
Stop: function() {
//移除事件
removeEventHandler(document, "mousemove", this._fM);
removeEventHandler(document, "mouseup", this._fS);
if (isIE) {
removeEventHandler(this._Handle, "losecapture", this._fS);
this._Handle.releaseCapture();
} else {
removeEventHandler(window, "blur", this._fS);
};
//附加程序
this.onStop();
}
};//以下是调用以上插件实现拖动
var drag = new Drag("idDrag", {
mxContainer: "idContainer",
Handle: "idHandle",
Limit: true,
onStart: function() {
$("idShow").innerHTML = "开始拖放";
},
onMove: function() {
$("idShow").innerHTML = "left：" + this.Drag.offsetLeft + "；top:" + this.Drag.offsetTop;
},
onStop: function() {
$("idShow").innerHTML = "结束拖放";
}
});$("idReset").onclick = function() {
drag.Limit = true;
drag.mxLeft = drag.mxTop = 0;
drag.mxRight = drag.mxBottom = 9999;
drag.LockX = drag.LockY = drag.Lock = false;
}$("idLock").onclick = function() {
drag.Lock = true;
}
$("idLockX").onclick = function() {
drag.LockX = true;
}
$("idLockY").onclick = function() {
drag.LockY = true;
}
$("idLimit").onclick = function() {
drag.mxRight = drag.mxBottom = 200;
drag.Limit = true;
}
$("idLimitOff").onclick = function() {
drag.Limit = false;
}</script><!-- Generated by RunJS (Sun Mar 13 10:40:31 CST 2016) 0ms --></body></html>
效果：http://sandbox.runjs.cn/show/hbhrnv2g
1.2 简易拖放效果
<!DOCTYPE html>
<!-- saved from url=(0037)http://sandbox.runjs.cn/show/xq0yj0sd -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>简易拖放效果</title>
</head>
<body>
<div id="central" style="position: absolute;">
此拖动效果要将被拖动元素布局设为absolute
</div> <style>#central
{
background-color:pink;
width:300px;
height:200px;
}</style>
<script>var isIE = (document.all) ? true: false;var $ = function(id) {
return "string" == typeof id ? document.getElementById(id) : id;
};var Class = {
create: function() {
return function() {
this.initialize.apply(this, arguments);
}
}
}var Extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
}var Bind = function(object, fun) {
return function() {
return fun.apply(object, arguments);
}
}var BindAsEventListener = function(object, fun) {
return function(event) {
return fun.call(object, (event || window.event));
}
}function addEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.addEventListener) {
oTarget.addEventListener(sEventType, fnHandler, false);
} else if (oTarget.attachEvent) {
oTarget.attachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = fnHandler;
}
};function removeEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.removeEventListener) {
oTarget.removeEventListener(sEventType, fnHandler, false);
} else if (oTarget.detachEvent) {
oTarget.detachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = null;
}
};//拖放程序
var SimpleDrag = Class.create();
SimpleDrag.prototype = {
//拖放对象,触发对象
initialize: function(drag) {
this.Drag = $(drag);
this._x = this._y = 0;
this._fM = BindAsEventListener(this, this.Move);
this._fS = Bind(this, this.Stop);
this.Drag.style.position = "absolute";
addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start));
},
//准备拖动
Start: function(oEvent) {
this._x = oEvent.clientX - this.Drag.offsetLeft;
this._y = oEvent.clientY - this.Drag.offsetTop;
addEventHandler(document, "mousemove", this._fM);
addEventHandler(document, "mouseup", this._fS);
},
//拖动
Move: function(oEvent) {
this.Drag.style.left = oEvent.clientX - this._x + "px";
this.Drag.style.top = oEvent.clientY - this._y + "px";
},
//停止拖动
Stop: function() {
removeEventHandler(document, "mousemove", this._fM);
removeEventHandler(document, "mouseup", this._fS);
}
};new SimpleDrag("central");</script><!-- Generated by RunJS (Sun Mar 13 10:41:02 CST 2016) 0ms --></body></html>
效果：http://sandbox.runjs.cn/show/xq0yj0sd
实现2
<!DOCTYPE html>
<!-- saved from url=(0037)http://sandbox.runjs.cn/show/o8sbts8t -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><html"><title>
D类
</title><div id="block1_outer">
<div id="block1_inner" onmousedown="var wc = this;D.start(wc, null, function (property) {
var node = wc.parentNode;
var a = D.pos(node), b = D.pos(wc);
node.style.left = property.left - b.x + a.x + 'px';node.style.top = property.top - b.y + a.y + 'px';
}, null);">
拽
</div>
</div><div id="block2_outer" onmousedown="var wc = this;D.start(wc, null, function (property) {
wc.style.left = property.left + 'px';
wc.style.top = property.top + 'px';
}, null);">
拽
</div> <style>html, body {
margin:0;
}#block1_outer
{
position:relative;
width:100px;
height:100px;
background-color:#000000;
}
#block1_inner
{
position:absolute;
width:20px;
height:20px;
line-height:20px;
left:50%;
top:50%;
margin:-10px 0 0 -10px; background-color:#F00;
text-align:center;
cursor:move;
}#block2_outer
{
width:50px;
height:50px;
line-height:50px;
text-align:center;
background-color:#F00;
position:absolute; cursor:move;
}#block2_inner
{
position:absolute;
width:20px;
height:20px;
line-height:20px;
left:50%;
top:50%;
margin:-10px 0 0 -10px; background-color:#F00;
text-align:center;
cursor:move;
}</style>
<script>//实现拖动的插件
!! window.__defineGetter__ && !/MSIE/.test(navigator.userAgent) &&
function() { ! window.opera && window.__defineGetter__('event',
function() {
//兼容Event对象
var o = arguments.callee;
do {
if (o.arguments[0] instanceof Event) return o.arguments[0];
} while ( o = o . caller );
return null;
}); window.attachEvent = Document.prototype.attachEvent = Element.prototype.attachEvent = function(type, listener, capture) {
//兼容attachEvent方法
return this.addEventListener(new String(type).substr(2), listener, capture || false);
}; window.detachEvent = Document.prototype.detachEvent = Element.prototype.detachEvent = function(type, listener, capture) {
//兼容detachEvent方法
return this.removeEventListener(new String(type).substr(2), listener, capture || false);
};} ();
var D = {
//拽补助类
lock: false ,
dom: function() {
//document相关属性
return {
left: document.documentElement.scrollLeft,
top: document.documentElement.scrollTop,
width: document.documentElement.clientWidth,
height: document.documentElement.clientHeight,
body: document.documentElement
};
} ,
mos: function(e) {
//获取鼠标绝对位置
var dom = this.dom(); return {
'x': dom.left + e.clientX,
'y': dom.top + e.clientY
}
} ,
pos: function(o) {
//获取元素绝对位置
var x = 0,
y = 0;
do {
x += o.offsetLeft, y += o.offsetTop;
} while ( o = o . offsetParent );
return {
'x': x,
'y': y
};
} ,
start: function(element, startEventHandler, moveEventHandler, stopEventHandler) {
//移动开始
if (this.lock) return;
else this.lock = true;
//先上锁安全。。。:D
var pos = this.pos(element) //元素位置
,
mos = this.mos(window.event) //鼠标位置
,
eventHandlers = {
MF: null,
EF: null
}
//事件记录
,
property = {
x: mos.x - pos.x,
y: mos.y - pos.y,
left: pos.x,
top: pos.y
}
//属性
,
_MF = this.move(moveEventHandler, property) //移动过程事件闭包
,
_EF = this.stop(element, stopEventHandler, eventHandlers);
//移动停止事件闭包
try {
document.selection && document.selection.empty && (document.selection.empty(), 1) || window.getSelection && window.getSelection().removeAllRanges();
} catch(exp) {} document.attachEvent('onmousemove', _MF);
//鼠标移动
document.attachEvent('onmouseup', _EF);
//鼠标释放
element.setCapture ? (element.setCapture(), element.attachEvent('onlosecapture', _EF)) : window.attachEvent('onblur', _EF);
//鼠标捕获丢失则释放
eventHandlers.MF = _MF,
eventHandlers.EF = _EF; startEventHandler && startEventHandler(property);
//直接传过去。。。请误污染- -
} ,
move: function(moveEventHandler, property) {
//移动中
var wc = this; return function(e) {
var mos = wc.mos(e || window.event),
dom = wc.dom();
window.getSelection && window.getSelection().removeAllRanges(); /MSIE/.test(navigator.userAgent) &&
function() {
//IE滚屏
if (mos.x > dom.left + dom.width) dom.body.scrollLeft = mos.x - dom.width;
else if (mos.x < dom.left) dom.body.scrollLeft = mos.x; if (mos.y > dom.top + dom.height) dom.body.scrollTop = mos.y - dom.height;
else if (mos.y < dom.top) dom.body.scrollTop = mos.y;
} (); property.left = mos.x - property.x,
property.top = mos.y - property.y; moveEventHandler && moveEventHandler(property);
//直接传过去。。。请误污染- -;
};
} ,
stop: function(element, stopEventHandler, eventHandlers) {
//移动结束
var wc = this;
return function(e) {
document.detachEvent('onmousemove', eventHandlers.MF);
document.detachEvent('onmouseup', eventHandlers.EF);
element.setCapture ? (element.detachEvent('onlosecapture', eventHandlers.EF), element.releaseCapture()) : window.detachEvent('onblur', eventHandlers.EF);
wc.lock = false;
//事件都干掉了可以放心解锁了
stopEventHandler && stopEventHandler();
};
}};</script><!-- Generated by RunJS (Sun Mar 13 10:41:11 CST 2016) 1ms --></html"></body></html>
