我发现下面有人在这个论坛上发布的代码是我需要的。但此代码仅适用于 IE，不适用于 Mozilla Firefox。此代码可以执行向上/向下拖动行（右侧的绿色符号）。
从链接获得此代码：
在 Mozilla Firefox 中，我不断收到“ReferenceError：未定义事件”。似乎是 Firefox 无法识别该事件，但我不知道如何修复它。
有人可以帮忙吗。谢谢！
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<body bgcolor=white>
<table width=100% height=100% cellpadding=0 cellspacing=0>
<tr>
<td valign=top style="padding: 5px;" rowspan=2 height=99%>
<script language="JavaScript">
function get( e ){ return( document.getElementById( e ) ); }
function findPosX( obj )
{
var curleft = 0;
if( obj.offsetParent )
{
while( obj.offsetParent )
{
curleft += obj.offsetLeft;
obj = obj.offsetParent;
}
}
else if( obj.x ) curleft += obj.x;
return( curleft );
}
function findPosY( obj )
{
var curtop = 0;
if( obj.offsetParent )
{
while( obj.offsetParent )
{
curtop += obj.offsetTop;
obj = obj.offsetParent;
}
}
else if( obj.y ) curtop += obj.y;
return( curtop );
}
function getClickX( e )
{
if( !e ) e = event;
var scrollLeft = document.body.scrollLeft;
if( scrollLeft <= 0 && document.documentElement )
{
scrollLeft = document.documentElement.scrollLeft;
}
return( e.clientX + scrollLeft );
}
function getClickY( e )
{
if( !e ) e = event;
var scrollTop = document.body.scrollTop;
if( scrollTop <= 0 && document.documentElement )
{
scrollTop = document.documentElement.scrollTop;
}
return( e.clientY + scrollTop );
}
window.onload = function()
{
addTask( "" );
};
document.onclick = function()
{
with( get("ControlDiv") )
{
style.visibility = "hidden";
}
}
function RowFromPos( table, x, y )
{
if( x >= findPosX( table ) && x < findPosX( table ) + table.clientWidth )
{
if( y >= findPosY( table ) && y < findPosY( table ) + table.clientHeight )
{
for( i = 0 ; i < table.rows.length ; i++ )
{
if( x >= findPosX( table.rows[i] ) && x < findPosX( table.rows[i] ) + table.rows[i].clientWidth &&
y >= findPosY( table.rows[i] ) && y < findPosY( table.rows[i] ) + table.rows[i].clientHeight )
{
return( i );
}
}
}
}
return( -1 );
}
var clickY = 0, dragRow = null;
function onDragBegin( row )
{
document.onmouseup = onDragDrop;
document.onmousemove = onDragDrag;
dragRow = row;
clickY = getClickY( event );
dragRow.style.backgroundColor = "gold";
}
function onDragDrag()
{
var curX = getClickX( event );
var curY = getClickY( event );
var rowIndex = RowFromPos( get("TaskTable"), curX, curY );
if( rowIndex != -1 && rowIndex != dragRow.rowIndex )
{
if( rowIndex < dragRow.rowIndex )
{
// Move Up
var parent = dragRow.parentNode;
var prev = dragRow.previousSibling;
if( prev )
{
parent.removeChild( dragRow );
parent.insertBefore( dragRow, prev );
}
}
else
{
// Move down
var next = dragRow.nextSibling;
var par = dragRow.parentNode;
par.removeChild( dragRow );
if( next.nextSibling )
{
par.insertBefore( dragRow, next.nextSibling );
}
else
{
par.appendChild( dragRow );
}
}
}
}
function onDragDrop()
{
document.onmouseup = null;
document.onmousemove = null;
dragRow.style.backgroundColor = "";
fixTable();
}
function addTask( task)
{
var table = get("TaskTable");
var row = table.insertRow( table.rows.length );
var cell = row.insertCell( row.cells.length );
cell.align = "right"; cell.vAlign = "bottom";
cell.width = "1%"; cell.noWrap = true;
cell.innerHTML = "<b>0.</b>";
cell = row.insertCell( row.cells.length );
cell.width = "99%";
var div = document.createElement("DIV");
div.designMode = "on";
div.contentEditable = true;
div.style.width = "99%";
div.style.height = "50px";
div.style.border = "1px solid black";
div.style.padding = "2px";
div.style.overflow = "scroll";
div.style.overflowX = "auto";
div.style.cursor = "text";
div.innerHTML = ( task != "" ? task : "<font color=\"gray\" face=\"Tahoma\">Enter task desciption here</font>" );
div.onfocus = function()
{
if( this.innerText == "Enter task desciption here" )
{
this.innerHTML = "";
}
event.cancelBubble = true;
showControlDiv( this );
}
div.onclick = function()
{
event.cancelBubble = true;
};
div.onblur = function()
{
if( this.innerText.replace(/^\s*/, "").replace(/\s*$/, "") == "" )
{
this.innerHTML = "<font color=\"gray\" face=\"Tahoma\">Enter task desciption here</font>";
}
}
div.onselectstart = function()
{
event.cancelBubble = true;
};
cell.appendChild( div );
cell = row.insertCell( row.cells.length );
cell.width = 15; cell.align = "right"; cell.vAlign = "bottom";
cell.innerHTML = "<font color=red face=Tahoma size=2 style='cursor: pointer;' onclick='JavaScript: deleteTask( this.parentElement.parentElement.rowIndex );'><b>X</b></a>";
var handle = document.createElement( "DIV" );
handle.innerHTML = "<font color=green size=6><b>*</b></font>";
handle.style.cursor = "n-resize";
handle.onmousedown = function()
{
onDragBegin( this.parentElement.parentElement );
};
cell.appendChild( handle );
fixTable();
}
function deleteTask( row )
{
get("TaskTable").deleteRow( row );
fixTable();
}
function deleteAll()
{
var table = get("TaskTable");
while( table.rows.length > 0 ) table.deleteRow( 0 );
}
function fixTable()
{
var numTask = 0;
var table = get("TaskTable");
for( var i = 0 ; i < table.rows.length ; i++ )
{
numTask++;
table.rows[i].cells[0].innerHTML = "<b>" + numTask + ".</b>";
}
}
function showControlDiv( parent )
{
var div = get("ControlDiv");
var x = findPosX( parent );
var y = findPosY( parent );
div.style.top = ( y - 39 ) + "px";
div.style.left = x + "px";
div.style.width = ( parent.offsetWidth - 17 ) + "px";
div.style.visibility = "visible";
}
</script>
<form method=post action="blah">
<div unselectable=on id=ControlDiv style=" visibility: hidden; position: absolute; top: -1000px; left: -1000px;; padding-top: 3px; padding-left: 15px; background-color: white; border: 1px solid black; border-bottom: 0px; border-top-left-radius: 15px; border-top-right-radius: 15px; width: 100%; height: 35px;">
<button unselectable=on style="border: 1px solid black; width: 30px; height: 30px; display: inline; text-align: center; cursor: pointer; margin-right: 10px;" onclick="JavaScript: event.cancelBubble=true; document.execCommand( 'Bold' ); return( false );"><font size=4><b>B</b></b></font></button>
<button unselectable=on style="border: 1px solid black; width: 30px; height: 30px; display: inline; text-align: center; cursor: pointer; margin-right: 10px;" onclick="JavaScript: event.cancelBubble=true; document.execCommand( 'Italic' ); return( false );"><font size=4><i>I</b></i></font></button>
<button unselectable=on style="border: 1px solid black; width: 30px; height: 30px; display: inline; text-align: center; cursor: pointer; margin-right: 10px;" onclick="JavaScript: event.cancelBubble=true; document.execCommand( 'Underline' ); return( false );"><font size=4><u>U</b></u></font></button>
<!-- <button unselectable=on style="border: 1px solid black; width: 30px; height: 30px; display: inline; text-align: center; cursor: pointer; margin-right: 10px;" onclick="JavaScript: event.cancelBubble=true; return( false );"><img src=images/img.bmp></button> -->
Font Face:
<select unselectable=on style="width: 200px; margin-right: 10px;" onclick="JavaScript: event.cancelBubble=true;" onchange="JavaScript: document.execCommand( 'FontName', false, this.value ); return( false );">
<option value="Times New Roman">Times New Roman</option>
<option value="Courier New">Courier New</option>
<option value="Tahoma">Tahoma</option>
</select>
Font Size:
<select unselectable=on style="width: 75px;" onclick="JavaScript: event.cancelBubble=true;" onchange="JavaScript: document.execCommand( 'FontSize', false, this.value ); return( false );">
<option value=1>1 (8pt)</option>
<option value=2>2 (10pt)</option>
<option value=3 selected>3 (12pt)</option>
<option value=4>4 (14pt)</option>
<option value=5>5 (18pt)</option>
<option value=6>6 (24pt)</option>
<option value=7>7 (36pt)</option>
</select>
</div>
<br><br><br>
<table width=100% onselectstart="JavaScript: return( false );">
<tr>
<td width=1% nowrap><font size=5><b>Task List:</b></font></td>
<td width=33% align=center style="color: blue; font-family: Tahoma; cursor: pointer;" onclick="JavaScript: addTask( '', false );"><font size=5>+</font> Add Task</td>
<td width=33% align=center style="color: red; font-family: Tahoma; cursor: pointer;" onclick="JavaScript: if( confirm( 'Are you sure you want to delete all tasks from this template?' ) ) deleteAll();"><font size=2><b>X</b></font> Delete All</td>
</tr>
</table>
<table width=100% id=TaskTable cellspacing=0 onselectstart="JavaScript: return( false );"></table>
</form>
<br><br><br><br><br>
</td>
</tr>
</table>
</body>
</html>