本文譯自：http://www.webreference.com/programming/javascript/mk/column2/index.html
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Javascript的特點是dom的處理與網頁效果，大多數情況我們只用到了這個語言的最簡單的功能，比如製作圖片輪播/網頁的tab等等，這篇文章將向你展示如何在自己的網頁上製作拖拽．
有很多理由讓你的網站加入拖拽功能，最簡單的一個是資料重組．例如：你有一個序列的內容讓使用者排序，使用者需要給每個條目進行輸入或者用select選擇，替代前面這個方法的就是拖拽．或許你的網站也需要一個使用者可以拖動的導航視窗！那麼這些效果都是很簡單：因為你可以很容易的實現！
網頁上實現拖拽其實也不是很複雜．第一你需要知道滑鼠座標，第二你需要知道使用者滑鼠點擊一個網頁元素並實現拖拽，最後我們要實現移動這個元素．
<SCRIPT src="http://www.blueidea.com/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>範例- 拖拽頁面元素</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>
[Ctrl+A 全選 注:如需引入外部Js需重新整理才能執行]
擷取滑鼠移動資訊
第一我們需要擷取滑鼠的座標．我們加一個使用者函數到document.onmousemove就可以了:
複製代碼 代碼如下:
document.onmousemove = mouseMove;
function mouseMove(ev){
ev = ev || window.event;
var mousePos = mouseCoords(ev);
}
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
};
}
<script> function mouseMove(ev){ ev = ev || window.event; var mousePos = mouseCoords(ev); document.getElementById('xxx').value = mousePos.x; document.getElementById('yyy').value = mousePos.y; } 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 }; } document.onmousemove = mouseMove; </script>Mouse X Position: <input id=xxx type=text> Mouse Y Position: <input id=yyy type=text> </body> </html>
[Ctrl+A 全選 注:如需引入外部Js需重新整理才能執行]
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