怎么用javascript进行拖拽 / 学生王国

怎么用javascript进行拖拽

本文译自：http://www.webreference.com/programming/javascript/mk/column2/index.html
所有版权归原文所有

Javascript的特点是dom的处理与网页效果，大多数情况我们只用到了这个语言的最简单的功能，比如制作图片轮播/网页的tab等等，这篇文章将向你展示如何在自己的网页上制作拖拽．

有很多理由让你的网站加入拖拽功能，最简单的一个是数据重组．例如：你有一个序列的内容让用户排序，用户需要给每个条目进行输入或者用select选择，替代前面这个方法的就是拖拽．或许你的网站也需要一个用户可以拖动的导航窗口！那么这些效果都是很简单：因为你可以很容易的实现！

网页上实现拖拽其实也不是很复杂．第一你需要知道鼠标坐标，第二你需要知道用户鼠标点击一个网页元素并实现拖拽，最后我们要实现移动这个元素．

运行代码框
<SCRIPT src="/articleimg/2006/07/3791/drag_drop.js" type=text/javascript></SCRIPT> <STYLE type=text/css>LI { MARGIN-BOTTOM: 10px } OL { MARGIN-TOP: 5px } .DragContainer { BORDER-RIGHT: #669999 2px solid; PADDING-RIGHT: 5px; BORDER-TOP: #669999 2px solid; PADDING-LEFT: 5px; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN: 3px; BORDER-LEFT: #669999 2px solid; WIDTH: 100px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 2px solid } .OverDragContainer { BORDER-RIGHT: #669999 2px solid; PADDING-RIGHT: 5px; BORDER-TOP: #669999 2px solid; PADDING-LEFT: 5px; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN: 3px; BORDER-LEFT: #669999 2px solid; WIDTH: 100px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 2px solid } .OverDragContainer { BACKGROUND-COLOR: #eee } .DragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .OverDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .DragDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .miniDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .OverDragBox { BACKGROUND-COLOR: #ffff99 } .DragDragBox { BACKGROUND-COLOR: #ffff99 } .DragDragBox { FILTER: alpha(opacity=50); BACKGROUND-COLOR: #ff99cc } LEGEND { FONT-WEIGHT: bold; FONT-SIZE: 12px; COLOR: #666699; FONT-FAMILY: verdana, tahoma, arial } FIELDSET { PADDING-RIGHT: 3px; PADDING-LEFT: 3px; PADDING-BOTTOM: 3px; PADDING-TOP: 3px } .History { FONT-SIZE: 10px; OVERFLOW: auto; WIDTH: 100%; FONT-FAMILY: verdana, tahoma, arial; HEIGHT: 82px } #DragContainer8 { BORDER-RIGHT: #669999 1px solid; PADDING-RIGHT: 0px; BORDER-TOP: #669999 1px solid; PADDING-LEFT: 5px; PADDING-BOTTOM: 0px; BORDER-LEFT: #669999 1px solid; WIDTH: 110px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 1px solid; HEIGHT: 110px } .miniDragBox { FLOAT: left; MARGIN: 0px 5px 5px 0px; WIDTH: 20px; HEIGHT: 20px } PRE { BORDER-RIGHT: #ccc 1px solid; PADDING-RIGHT: 10px; BORDER-TOP: #ccc 1px solid; PADDING-LEFT: 10px; PADDING-BOTTOM: 10px; BORDER-LEFT: #ccc 1px solid; PADDING-TOP: 10px; BORDER-BOTTOM: #ccc 1px solid; BACKGROUND-COLOR: #f8f8f0 } </STYLE> <body> <FIELDSET id=Demo4><LEGEND>样例- 拖拽页面元素</LEGEND> <DIV> <DIV class=DragContainer id=DragContainer4 overclass="OverDragContainer"> <DIV class=DragBox id=Item1 overclass="OverDragBox" dragclass="DragDragBox">Item #1</DIV> <DIV class=DragBox id=Item2 overclass="OverDragBox" dragclass="DragDragBox">Item #2</DIV> <DIV class=DragBox id=Item3 overclass="OverDragBox" dragclass="DragDragBox">Item #3</DIV> <DIV class=DragBox id=Item4 overclass="OverDragBox" dragclass="DragDragBox">Item #4</DIV></DIV> <DIV class=DragContainer id=DragContainer5 overclass="OverDragContainer"> <DIV class=DragBox id=Item5 overclass="OverDragBox" dragclass="DragDragBox">Item #5</DIV> <DIV class=DragBox id=Item6 overclass="OverDragBox" dragclass="DragDragBox">Item #6</DIV> <DIV class=DragBox id=Item7 overclass="OverDragBox" dragclass="DragDragBox">Item #7</DIV> <DIV class=DragBox id=Item8 overclass="OverDragBox" dragclass="DragDragBox">Item #8</DIV></DIV> <DIV class=DragContainer id=DragContainer6 overclass="OverDragContainer"> <DIV class=DragBox id=Item9 overclass="OverDragBox" dragclass="DragDragBox">Item #9</DIV> <DIV class=DragBox id=Item10 overclass="OverDragBox" dragclass="DragDragBox">Item #10</DIV> <DIV class=DragBox id=Item11 overclass="OverDragBox" dragclass="DragDragBox">Item #11</DIV> <DIV class=DragBox id=Item12 overclass="OverDragBox" dragclass="DragDragBox">Item #12</DIV></DIV></DIV></FIELDSET> </body> </html>

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