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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm3.aspx.cs" Inherits="test.WEB_APP.WebForm3" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" >
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<head runat="server">
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<title>无标题页</title>
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<script language="Javascript" type="text/javascript">
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var obj , count,selectIndex,type;
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var MSG = [ {id:1,msg:"请选择要移动的项"},
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{id:2,msg:"已是第一个无法上移"},
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{id:3,msg:"已是最后一个无法下移"},
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]
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//初始化相关数据
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function intial(t)
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{
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obj = rtObject();
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count = ItemCount();
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selectIndex = getSelectIndex();
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type = t;
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}
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function move(t)
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{
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intial(t);
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if(!check())
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moveHandle();
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}
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function moveHandle()
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{
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//根据相关操作获得要变换位置的索引
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var operate = type == 1 ? "-1" : "+1" ;
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var index = eval( selectIndex + operate);
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var values = obj.options[index].value;
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var text = obj.options[index].text;
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obj.options[index].value = obj.options[selectIndex].value;
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obj.options[index].text = obj.options[selectIndex].text;
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obj.options[selectIndex].value = values;
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obj.options[selectIndex].text = text;
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obj.options[index].selected = true;
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}
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//检查是否可以移动
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function check()
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{
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var bool = type == 1 ? selectIndex == 0 : selectIndex == count-1 ;
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if(bool)
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alert(MSG[type].msg);
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return bool;
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}
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//获取当前选中项的索引
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function getSelectIndex()
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{
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var index = -1;
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for(var i = 0 ; i < count ; i ++)
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{
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if(obj.options[i].selected)
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{
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index = i;
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break;
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}
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}
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//判断有没有选择移动项
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if(index >=0 )
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return index;
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else
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alert(MSG[0].msg);
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}
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//获取项总数
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function ItemCount()
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{
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return obj.options.length;
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}
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//返回ListBox对象
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function rtObject()
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{
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return document.form1.elements["lb"];
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}
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</script>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<asp:ListBox ID="lb" runat="server" Height="144px" Width="179px">
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<asp:ListItem>a</asp:ListItem>
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<asp:ListItem>b</asp:ListItem>
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<asp:ListItem>c</asp:ListItem>
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<asp:ListItem>d</asp:ListItem>
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<asp:ListItem>e</asp:ListItem>
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<asp:ListItem>f</asp:ListItem>
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<asp:ListItem>g</asp:ListItem>
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<asp:ListItem>h</asp:ListItem>
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</asp:ListBox>
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<input id="Button1" type="button" onclick="move(1)" value="上移" />
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<input id="Button2" type="button" onclick="move(2)" value="下移" /></div>
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</form>
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</body>
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</html>
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