Javascript 元素拖曳操作 By shawl.qiu (相容IE,Opera,Firefox)
說明:
拖曳流程
滑鼠按下->(滑鼠移動->元素移動)
滑鼠按鍵彈起->元素停止移動
針對 IE, 主要使用 obj.attachEvent() && obj.detachEvent()
針對 Firefox 主要使用 DOM 2 的 obj.addEventListener() && obj.removeEventListener
Opera 以上兩種方法都支援
在本文中, 需要拖曳的元素必須指定style 屬性為 position:absolute;
且應指定 left && top 的座標值, 如:
linenum
- <div style=" border:1px dashed blue; width: 180px; text-align:center; position:absolute; left:100px; top: 150px;" onmousedown="fDragging(this, event, true);">
- element 1<br/>
- dragging compatibility for IE, Opera, Firefox.
- </div>
函數 fDragging(obj, e, limit) 的各參數解釋:
obj: HTML元素對象, 要拖曳的元素
e: 指定為 event 對象, 主要為相容 Firefox
limit: 布爾值, 指定是否只能在父元素中拖曳, false 可移動至任何位置.
函數 fDragging(obj, e, limit) 應該在 HTML onmousedown 屬性 下使用, 如:
linenum
- <div style=" border:1px dashed blue; width: 180px; text-align:center; position:absolute; left:50px; top: 50px;" onmousedown="fDragging(this, event, true);">
- element <br/>
- dragging compatibility for IE, Opera, Firefox.
- </div>
shawl.qiu
2006-11-10
http://blog.csdn.net/btbtd
函數: fDragging(obj, e, limit) 及使用示範
linenum
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
- <html xmlns=" http://www.w3.org/1999/xhtml">
- <!-- DW6 -->
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <title>shawl.qiu template</title>
- <script type="text/javascript">
- //<![CDATA[
- function fDragging(obj, e, limit){
- if(!e) e=window.event;
- var x=parseInt(obj.style.left);
- var y=parseInt(obj.style.top);
-
- var x_=e.clientX-x;
- var y_=e.clientY-y;
-
- if(document.addEventListener){
- document.addEventListener('mousemove', inFmove, true);
- document.addEventListener('mouseup', inFup, true);
- } else if(document.attachEvent){
- document.attachEvent('onmousemove', inFmove);
- document.attachEvent('onmouseup', inFup);
- }
-
- inFstop(e);
- inFabort(e)
-
- function inFmove(e){
- var evt;
- if(!e)e=window.event;
-
- if(limit){
- var op=obj.parentNode;
- var opX=parseInt(op.style.left);
- var opY=parseInt(op.style.top);
-
- if((e.clientX-x_)<0) return false;
- else if((e.clientX-x_+obj.offsetWidth+opX)>(opX+op.offsetWidth)) return false;
-
- if(e.clientY-y_<0) return false;
- else if((e.clientY-y_+obj.offsetHeight+opY)>(opY+op.offsetHeight)) return false;
- //status=e.clientY-y_;
- }
-
- obj.style.left=e.clientX-x_+'px';
- obj.style.top=e.clientY-y_+'px';
-
- inFstop(e);
- } // shawl.qiu script
- function inFup(e){
- var evt;
- if(!e)e=window.event;
-
- if(document.removeEventListener){
- document.removeEventListener('mousemove', inFmove, true);
- document.removeEventListener('mouseup', inFup, true);
- } else if(document.detachEvent){
- document.detachEvent('onmousemove', inFmove);
- document.detachEvent('onmouseup', inFup);
- }
-
- inFstop(e);
- } // shawl.qiu script
-
- function inFstop(e){
- if(e.stopPropagation) return e.stopPropagation();
- else return e.cancelBubble=true;
- } // shawl.qiu script
- function inFabort(e){
- if(e.preventDefault) return e.preventDefault();
- else return e.returnValue=false;
- } // shawl.qiu script
- }
- //]]>
- </script>
- </head>
- <body>
- <div style=" border:1px dashed blue; width: 760px; height:600px; text-align:center; position:absolute; left:100px; top: 10px;"> this parent
-
- <div style=" border:1px dashed blue; width: 180px; text-align:center; position:absolute; left:50px; top: 50px;" onmousedown="fDragging(this, event, true);">
- element <br/>
- dragging compatibility for IE, Opera, Firefox.
- </div>
- <div style=" border:1px dashed blue; width: 180px; text-align:center; position:absolute; left:100px; top: 150px;" onmousedown="fDragging(this, event, true);">
- element 1<br/>
- dragging compatibility for IE, Opera, Firefox.
- </div>
- <div style=" border:1px dashed blue; width: 180px; text-align:center; position:absolute; left:200px; top: 250px;" onmousedown="fDragging(this, event, false);">
- element 2<br/>
- dragging compatibility for IE, Opera, Firefox. <br/>
- <font color="red">dragging everywhere</font>
- </div>
- </div>
- </body>
- </html>
