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<script language="javascript">
function MoveSingleItem(sel_source, sel_dest)
{
if (sel_source.selectedIndex==-1) //源：没有点选任何项目
return;
if (sel_source.options[0].text=="无") //源：只有“无”项目
return;
if (sel_dest.options[0].text=="无") //目标：只有“无”项目，则先删除该提示性项目
sel_dest.options.remove(0);
var SelectedText = sel_source.options[sel_source.selectedIndex].text;
sel_dest.options.add(new Option(SelectedText));
sel_source.options.remove(sel_source.selectedIndex);
if (sel_source.options.length==0) //源：如果删除完所有有用项目，则添加提示项目：“无”
sel_source.options.add(new Option("无"));
}
function MoveAllItems(sel_source, sel_dest)
{
if (sel_source.options[0].text=="无") //源：只有“无”项目
return;
if (sel_dest.options[0].text=="无") //目标：只有“无”项目，则先删除该提示性项目
sel_dest.options.remove(0);
//首先拷贝所有项目到目标：
var sel_source_len = sel_source.length;
for (var j=0; j<sel_source_len; j++)
{
var SelectedText = sel_source.options[j].text;
sel_dest.options.add(new Option(SelectedText));
}
//然后删除“源”所有项目：
while ((k=sel_source.length-1)>=0)
{
if (sel_source.options[0].text=="无") //源：只有“无”项目
break;
sel_source.options.remove(k);
if (sel_source.options.length==0) //源：如果删除完所有有用项目，则添加提示项目：“无”
sel_source.options.add(new Option("无"));
}
}
function SelectAll(theSel) //选中select中全部项目
{ for (i = 0 ;i<theSel.length;i++)
theSel.options.selected = true;
}
</script>
<body>
<form name="frm1" id="frm1" method="post" action="save.asp">
<input name="allowsubmit" type="hidden" value="OK">
<table width="500" border="0" cellspacing="0" cellpadding="0" align="center">
<tr height=10><td colspan=3></td></tr>
<tr>
<td width="220" align=center valign="top">
已分配该用户管理的栏目：<br><br>
<select name="SelectedItem" id="SelectedItem" size=12 multiple="true">
<option>无</option>
</select>
</td>
<td width="80" align=center>
<br><br>
<button onClick="MoveSingleItem(WaitSelectItem, SelectedItem)"><</button><br><br>
<button onClick="MoveAllItems(WaitSelectItem, SelectedItem)"><<</button><br><br><br><br>
<button onClick="MoveSingleItem(SelectedItem, WaitSelectItem)">></button><br><br>
<button onClick="MoveAllItems(SelectedItem, WaitSelectItem)">>></button><br>
</td>
<td width="220" align=center valign="top">
待分配的栏目：<br><br>
<select name="WaitSelectItem" size=12 multiple=true>
<option >师大要闻</option>
<option >师大要闻2</option>
</select>
</td>
</tr>
</table>
</form>
function MoveSingleItem(sel_source, sel_dest)
{
if (sel_source.selectedIndex==-1) //源：没有点选任何项目
return;
if (sel_source.options[0].text=="无") //源：只有“无”项目
return;
if (sel_dest.options[0].text=="无") //目标：只有“无”项目，则先删除该提示性项目
sel_dest.options.remove(0);
var SelectedText = sel_source.options[sel_source.selectedIndex].text;
sel_dest.options.add(new Option(SelectedText));
sel_source.options.remove(sel_source.selectedIndex);
if (sel_source.options.length==0) //源：如果删除完所有有用项目，则添加提示项目：“无”
sel_source.options.add(new Option("无"));
}
function MoveAllItems(sel_source, sel_dest)
{
if (sel_source.options[0].text=="无") //源：只有“无”项目
return;
if (sel_dest.options[0].text=="无") //目标：只有“无”项目，则先删除该提示性项目
sel_dest.options.remove(0);
//首先拷贝所有项目到目标：
var sel_source_len = sel_source.length;
for (var j=0; j<sel_source_len; j++)
{
var SelectedText = sel_source.options[j].text;
sel_dest.options.add(new Option(SelectedText));
}
//然后删除“源”所有项目：
while ((k=sel_source.length-1)>=0)
{
if (sel_source.options[0].text=="无") //源：只有“无”项目
break;
sel_source.options.remove(k);
if (sel_source.options.length==0) //源：如果删除完所有有用项目，则添加提示项目：“无”
sel_source.options.add(new Option("无"));
}
}
function SelectAll(theSel) //选中select中全部项目
{ for (i = 0 ;i<theSel.length;i++)
theSel.options.selected = true;
}
</script>
<body>
<form name="frm1" id="frm1" method="post" action="save.asp">
<input name="allowsubmit" type="hidden" value="OK">
<table width="500" border="0" cellspacing="0" cellpadding="0" align="center">
<tr height=10><td colspan=3></td></tr>
<tr>
<td width="220" align=center valign="top">
已分配该用户管理的栏目：<br><br>
<select name="SelectedItem" id="SelectedItem" size=12 multiple="true">
<option>无</option>
</select>
</td>
<td width="80" align=center>
<br><br>
<button onClick="MoveSingleItem(WaitSelectItem, SelectedItem)"><</button><br><br>
<button onClick="MoveAllItems(WaitSelectItem, SelectedItem)"><<</button><br><br><br><br>
<button onClick="MoveSingleItem(SelectedItem, WaitSelectItem)">></button><br><br>
<button onClick="MoveAllItems(SelectedItem, WaitSelectItem)">>></button><br>
</td>
<td width="220" align=center valign="top">
待分配的栏目：<br><br>
<select name="WaitSelectItem" size=12 multiple=true>
<option >师大要闻</option>
<option >师大要闻2</option>
</select>
</td>
</tr>
</table>
</form>