当前位置: 首页 > 图文教程 > 网络编程 > Javascript > 拖动一个HTML元素

Javascript
一个可以兼容IE FF的加为首页与加入收藏实现代码
javascript(jquery)利用函数修改全局变量的代码
JQuery 解析多维的Json数据格式
javascript 按回车键相应按钮提交事件
深入认识javascript中的eval函数
jquery tree 可编辑节点实现代码(jquery一句话节点菜单)
js window.onload 加载多个函数的方法
MAC官方菜单纯CSS实现灰色会换色
CSS Filter背景透明提示
CSS鼠标悬停菜单 图片交换技术实现
纯JS图片批量预加载技术代码
实用的层滑开js实现代码
jQuery get和post 方法传值注意事项
JQuery打造PHP的AJAX表单提交实例
Jquery AJAX 框架的使用方法
基于JQuery框架的AJAX实例代码
jquery ajax 检测用户注册时用户名是否存在
javascript 限制输入脚本大全
JavaScript window.setTimeout() 的详细用法
JavaScript 表格高亮类的应用[高级]

No. « 270 271 272 273 »

技术文章搜索

关键字

Javascript 中的 拖动一个HTML元素

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-09-12   浏览: 98 ::
收藏到网摘: n/a

<script content="text/javascript">
var iMouseDown = false;
var dragObject = null;
Number.prototype.NaN0=function(){return isNaN(this)?0:this;}
// Demo 0 variables
var DragDrops = [];
var curTarget = null;
var lastTarget = null;
function makeDraggable(item){
if(!item) return;
item.onmousedown = function(ev){
dragObject = this;
mouseOffset = getMouseOffset(this, ev);
return false;
}
}
function getMouseOffset(target, ev){
ev = ev || window.event;
var docPos = getPosition(target);
var mousePos = mouseCoords(ev);
return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};
}
function getPosition(e){
var left = 0;
var top = 0;
while (e.offsetParent){
left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0);
top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0);
e = e.offsetParent;
}
left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0);
top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0);
return {x:left, y:top};
}
function mouseCoords(ev){
if(ev.pageX || ev.pageY){
return {x:ev.pageX, y:ev.pageY};
}
return {
x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
y:ev.clientY + document.body.scrollTop - document.body.clientTop
};
}
function mouseDown(ev){
ev = ev || window.event;
var target = ev.target || ev.srcElement;
if(target.onmousedown || target.getAttribute('DragObj')){
return false;
}
}
function mouseUp(ev){
//dragObject = null;
if(dragObject){
ev = ev || window.event;
var mousePos = mouseCoords(ev);
var dT = dragObject.getAttribute('droptarget');
if(dT){
var targObj = document.getElementById(dT);
var objPos = getPosition(targObj);
if((mousePos.x > objPos.x) && (mousePos.y > objPos.y)
&& (mousePos.x<(objPos.x+parseInt(targObj.offsetWidth)))
&& (mousePos.y<(objPos.y+parseInt(targObj.offsetHeight)))){
var nSrc = targObj.getAttribute('newSrc');
if(nSrc){
dragObject.src = nSrc;
setTimeout(function(){
if(!dragObject || !dragObject.parentNode) return;
dragObject.parentNode.removeChild(dragObject);
dragObject = null;
}, parseInt(targObj.getAttribute('timeout')));
} else {
dragObject.parentNode.removeChild(dragObject);
}
}
}
}
dragObject = null;
iMouseDown = false;
}
function mouseMove(ev){
ev = ev || window.event;
/*
We are setting target to whatever item the mouse is currently on
Firefox uses event.target here, MSIE uses event.srcElement
*/
var target = ev.target || ev.srcElement;
var mousePos = mouseCoords(ev);
if(dragObject){
dragObject.style.position = 'absolute';
dragObject.style.top = mousePos.y - mouseOffset.y;
dragObject.style.left = mousePos.x - mouseOffset.x;
}
// track the current mouse state so we can compare against it next time
lMouseState = iMouseDown;
// this prevents items on the page from being highlighted while dragging
if(curTarget || dragObject) return false;
}
function addDropTarget(item, target){
item.setAttribute('droptarget', target);
}
document.onmousemove = mouseMove;
document.onmousedown = mouseDown;
document.onmouseup = mouseUp;
window.onload = function (){
makeDraggable(document.getElementById('DragImage9'));
makeDraggable(document.getElementById('DragImage10'));
makeDraggable(document.getElementById('DragImage11'));
makeDraggable(document.getElementById('DragImage12'));
addDropTarget(document.getElementById('DragImage9'), 'TrashImage1');
addDropTarget(document.getElementById('DragImage10'), 'TrashImage1');
addDropTarget(document.getElementById('DragImage11'), 'TrashImage1');
addDropTarget(document.getElementById('DragImage12'), 'TrashImage1');
}
</script>
</head>
<body>
<fieldset id="Demo6" style="height: 70px"><h3>Demo - Drag any of the images</h3>
<img id="TrashImage1" src="http://www.cnlei.org/codes/javascript/js-drag-drop/images/drag_drop_trash.gif" />
<img id="DragImage9" src="http://www.cnlei.org/codes/javascript/js-drag-drop/images/drag_drop_spade.gif" />
<img id="DragImage10" src="http://www.cnlei.org/codes/javascript/js-drag-drop/images/drag_drop_heart.gif" />
<img id="DragImage11" src="http://www.cnlei.org/codes/javascript/js-drag-drop/images/drag_drop_diamond.gif" />
<img id="DragImage12" src="http://www.cnlei.org/codes/javascript/js-drag-drop/images/drag_drop_club.gif" />
</fieldset>