CheckBox为CheckBoxList实现全选或全取消选择

某一个时候，CheckBoxList的选择太多，用户需要一个全选或全取消的功能。下面Insus.NET使用Javascript来实现它。

准备好一个对象：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for MusicType
/// </summary>
namespace Insus.NET
{
    public class MusicType
    {
        private int _ID;
        private string _TypeName;

        public int ID
        {
            get { return _ID; }
            set { _ID = value; }
        }
        public string TypeName
        {
            get { return _TypeName; }
            set { _TypeName = value; }
        }

        public MusicType()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        public MusicType(int id, string typeName)
        {
            this._ID = id;
            this._TypeName = typeName;
        }        
    }
}

填充对象：

 public List<MusicType> GetMusicType()
    {
        List<MusicType> mt = new List<MusicType>();

        mt.Add(new MusicType(1, "甜密情歌"));
        mt.Add(new MusicType(2, "网络红歌"));
        mt.Add(new MusicType(3, "儿童歌曲"));
        mt.Add(new MusicType(4, "民族精选"));
        mt.Add(new MusicType(5, "校园歌曲"));
        mt.Add(new MusicType(6, "摇滚音乐"));
        mt.Add(new MusicType(7, "胎教音乐"));
        mt.Add(new MusicType(8, "红色名曲"));
        mt.Add(new MusicType(9, "串烧金曲"));
        mt.Add(new MusicType(10, "动慢歌曲"));
        return mt;
    }

在站点建一个aspx网页，并拉两个控件，一个是CheckBox和CheckBoxList:

全选<asp:CheckBox ID="CheckBoxAll" runat="server" onClick="javascript:Check_Uncheck_All(this);" /><br />
            <asp:CheckBoxList ID="CheckBoxListMusicType" runat="server" RepeatColumns="3" RepeatDirection="Horizontal" Width="300"></asp:CheckBoxList>

接下来，我们为CheckBoxList绑定数据：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Insus.NET;

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

    private void Data_Binding()
    {
        this.CheckBoxListMusicType.DataSource = GetMusicType();
        this.CheckBoxListMusicType.DataTextField = "TypeName";
        this.CheckBoxListMusicType.DataValueField = "ID";
        this.CheckBoxListMusicType.DataBind ();
    }   
}

最后是写Javascript代码：

 <script type="text/javascript">
        function Check_Uncheck_All(cb) {
            var cbl = document.getElementById("<%=CheckBoxListMusicType.ClientID%>");
            var input = cbl.getElementsByTagName("input");

            if (cb.checked) {
                for (var i = 0; i < input.length; i++) {
                    input[i].checked = true;
                }
            }
            else {
                for (var i = 0; i < input.length; i++) {
                    input[i].checked = false;
                }
            }            
        }
    </script>

ok完成，看看效果：