改成“absolute"后,需要获得元素的绝对位置。
var getAbsolutePos = function(el){
var d = /^div$/i.test(el.tagName),l = el.scrollLeft,t = el.scrollTop;
var L = d && l?l:0, T = d && t?t:0, r = [e1.offsetLeft - L,el.offsetTop - T];
if(el.offsetParent){
var p = getAbsolutePos(el.offsetParent);
r[0]+= p[0];r[1]+=p[1];
}
return r;
}
将:
this.dx = parseInt(this.handle.style.left + 0) - e.clientX;
this.dy = parseInt(this.handle.style.top + 0) - e.clientY;
改为:
var absp = getAbsolutePos(this.handle);
this.dx = absp[0]- e.clientX;
this.dy = absp[1]- e.clientY;
var getAbsolutePos = function(el){
var d = /^div$/i.test(el.tagName),l = el.scrollLeft,t = el.scrollTop;
var L = d && l?l:0, T = d && t?t:0, r = [e1.offsetLeft - L,el.offsetTop - T];
if(el.offsetParent){
var p = getAbsolutePos(el.offsetParent);
r[0]+= p[0];r[1]+=p[1];
}
return r;
}
将:
this.dx = parseInt(this.handle.style.left + 0) - e.clientX;
this.dy = parseInt(this.handle.style.top + 0) - e.clientY;
改为:
var absp = getAbsolutePos(this.handle);
this.dx = absp[0]- e.clientX;
this.dy = absp[1]- e.clientY;
<head>
<title>Page Title</title>
<style>.drag {
cursor: move;
} .box {
margin: 0px;
width: 200px;
border: 1px solid #ccc;
}
.box h3.title {
margin: 0px;
width: 100%;
background-color: #ccc;
}
.box div.content {
margin: 0px;
width: 100%;
text-align: left;
}
</style><script type="text/javascript">
var getAbsolutePos = function(el){
var d = /^div$/i.test(el.tagName),l = el.scrollLeft,t = el.scrollTop;
var L = d && l?l:0, T = d && t?t:0, r = [el.offsetLeft - L,el.offsetTop - T];
if(el.offsetParent){
var p = getAbsolutePos(el.offsetParent);
r[0]+= p[0];r[1]+=p[1];
}
return r;
}
//GreatGhoul
//兼容ff, ie
//要拖动的对象的title设置为'dragable'
//拖动点的class设置为'drag',拖动点必须为可拖动对象的子节点var DragableObj = {
handle: null,
dx: 0,
dy: 0, init: function(e) {
e = e || event;
this.handle = e.target || e.srcElement;
if (this.handle.className.indexOf('drag') == -1) return;
//这句不知道谁写的,真他妈好用!
while (this.handle.tagName != 'HTML' && this.handle.title != "dragable") {
this.handle = this.handle.parentNode || this.handle.parentElement;
}
if (this.handle.title != 'dragable') return;
//如果改为absolute,点击例2后会出现错位,怎么解决。
this.handle.style.position = 'absolute';
var absp = getAbsolutePos(this.handle);
this.dx = absp[0]- e.clientX;
this.dy = absp[1]- e.clientY; document.onmousemove = DragableObj.drag;
},
drag: function(e) {
e = e || event;
if (this.handle != null) {
this.handle.style.left = (e.clientX + this.dx) + 'px';
this.handle.style.top = (e.clientY + this.dy) + 'px';
}
},
drop: function(e) {
this.handle = null;
document.onmousemove = null;
}
};
document.onmousedown = DragableObj.init;
document.onmouseup = DragableObj.drop;
document.onselectstart = function(e) {
e = e || event;
eo = e.target || event.srcElement;
if (eo.className.indexOf('drag') != -1) return false;
};</script>
</head>
<body>
<br>例1:
<div class="box" title="dragable">
<h3 class="drag title">title</h3>
<div class="content">fdsaffdsafdsafdsafds</div>
</div><br>例2:
<div class="drag" title="dragable">拖动我</div></body>
</html>
我尚不知道你的设计意图。但在一个“功能块”中,1、最好全部绝对定位或者全部相对定位。2、所有元素,包括TITLE 都应该包含在一个HTML标签中(div 或者 span)。根据你的需要,可以设计一套CSS,让这些元素绝对定位,再修正布局位置,也许可以解决你的问题。但绝对定位后,计算元素位置必须取得绝对位置,用那个getAbsolutePos方法应该没什么问题。
this.dx = this.dx > maxX?maxX:this.dx<minX?minX:this.dx;
this.dy = this.dy > maxY?maxY:this.dy<minY?minY:this.dy;
这个难点在于临界点的处理
例如当左边界到达临界线时,除了停止拖动,建议把div往右移到容器范围内一点
不然div会定在临界线不动
这个可能需要方向的判断应该可以做出来还有就是注意offset和left这些属性
由于offset是包括边框等整个div的长(宽)度的
所以在临界线的定位和移动上要注意一点