asp.net 在listbox中实现上移、下移、置顶、置底效果

先看效果:

这个问题是我女朋友问我的,她学的是VB,我自己尝试用asp.net来完成，在同学的帮助下完成了.

具体实现大家可以看下面代码;

default2.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!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" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
            <asp:ListItem Value="0">苹果</asp:ListItem>
            <asp:ListItem Value="1">荔汁</asp:ListItem>
            <asp:ListItem Value="2">桃子</asp:ListItem>
            <asp:ListItem Value="3">里</asp:ListItem>
        </asp:ListBox>
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" Text="置顶" OnClick="Button1_Click" /><br />
        <br />
        <asp:Button ID="btnUp" runat="server" Text="上移" OnClick="btnUp_Click" /><br />
        <br />
        <asp:Button ID="btnDown" runat="server" Text="下移" OnClick="btnDown_Click" /><br />
        <br />
        <asp:Button ID="Button2" runat="server" Text="置底" OnClick="Button2_Click" /><br />
    </div>
    </form>
</body>
</html>

default2.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default2 : System.Web.UI.Page
{
  
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.ListBox1.SelectedIndex = 0;
        }
      
    }

    protected string getSelectedValue()
    {
        return this.ListBox1.SelectedItem.Value;
    }

    protected string getSelectedText()
    {
        return this.ListBox1.SelectedItem.Text;
    }

    protected void btnUp_Click(object sender, EventArgs e)
    {
        if (this.ListBox1.SelectedIndex > 0)
        {
            string newValue = getSelectedValue();
            string newText = getSelectedText();

            //获取当前索引号
            int newIndex = this.ListBox1.SelectedIndex;


            //交换位置
            this.ListBox1.SelectedItem.Value = this.ListBox1.Items[newIndex - 1].Value;
            this.ListBox1.SelectedItem.Text = this.ListBox1.Items[newIndex - 1].Text;
            this.ListBox1.Items[newIndex - 1].Value = newValue;
            this.ListBox1.Items[newIndex - 1].Text = newText;

            //设定上一项为当前项
            this.ListBox1.SelectedIndex--;
        }
        else
        {
            Response.Write("<script>alert('超出');</script>");
        }

    }
    protected void btnDown_Click(object sender, EventArgs e)
    {
        if (this.ListBox1.SelectedIndex < this.ListBox1.Items.Count - 1)
        {
            string newValue = getSelectedValue();
            string newText = getSelectedText();

            //获取当前索引号
            int newIndex = this.ListBox1.SelectedIndex;


            //交换位置
            this.ListBox1.SelectedItem.Value = this.ListBox1.Items[newIndex + 1].Value;
            this.ListBox1.SelectedItem.Text = this.ListBox1.Items[newIndex + 1].Text;
            this.ListBox1.Items[newIndex + 1].Value = newValue;
            this.ListBox1.Items[newIndex + 1].Text = newText;

            //设定下一页为当前页
            this.ListBox1.SelectedIndex++;
        }
        else
        {
            Response.Write("<script>alert('超出');</script>");
        }

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
      
        string newValue = getSelectedValue();
        string newText = getSelectedText();

        //获取当前选中的索引
        int newIndex = this.ListBox1.SelectedIndex;


        for(int i = newIndex - 1;i >= 0;i --)
        {
            this.ListBox1.Items[i + 1].Text = this.ListBox1.Items[i].Text;
            this.ListBox1.Items[i + 1].Value = this.ListBox1.Items[i].Value;
        }
       
        this.ListBox1.Items[0].Value = newValue;
        this.ListBox1.Items[0].Text = newText;

        this.ListBox1.SelectedIndex = 0;
    }


    protected void Button2_Click(object sender, EventArgs e)
    {
        string newValue = getSelectedValue();
        string newText = getSelectedText();

        //获取当前选中的索引
        int newIndex = this.ListBox1.SelectedIndex;

        //获取总的数目
        int newCount = this.ListBox1.Items.Count;

        for (int i = newIndex; i < newCount - 1; i++)
        {
            this.ListBox1.Items[i].Text = this.ListBox1.Items[i + 1].Text;
            this.ListBox1.Items[i].Value = this.ListBox1.Items[i + 1].Value;
        }

        this.ListBox1.Items[newCount-1].Value = newValue;
        this.ListBox1.Items[newCount-1].Text = newText;

        this.ListBox1.SelectedIndex = newCount-1;
    }
}




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  • 日期：2007-5-14 22:53:00
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