一个Page页面多个CheckBoxList的客户端验证(.net1.1及2.0实现)

一，基于.net1.1
1、类文件

    
using System;
using System.Web.UI;
using System.Web;
using System.Web.UI.WebControls;
using System.Text;

namespace AgrExibition.Common.Framework.Util ...{

    欢迎与邀月交流,net技术与软件架构 2007/07/26#region downmoon 2007/07/26
    /**//// <summary>
    /// 一个Page页面多个CheckBoxList的客户端验证(.net1.1实现)(downmoon)
    /// </summary>
    #endregion
    public class RadioButtonListRequiredFieldValidator : BaseValidator 
    ...{

        protected override bool ControlPropertiesValid()
        ...{
            return true;
        }

        protected override bool EvaluateIsValid() 
        ...{
            return this.EvaluateIsChecked();
        }
        protected bool EvaluateIsChecked() 
        ...{
            ListControl _listcontrol = ((ListControl)this.FindControl(this.ControlToValidate)); 
            foreach( ListItem li in _listcontrol.Items ) 
            ...{
                if (li.Selected) return true; 
            }
            return false; 
        }

        protected override void OnPreRender( EventArgs e )
        ...{

            if ( this.EnableClientScript ) ...{ this.ClientScript(); }
            base.OnPreRender( e );

        }

        protected void ClientScript() 
        ...{
            this.Attributes["evaluationfunction"] = "cb_vefify";

            StringBuilder sb_Script = new StringBuilder();
            sb_Script.Append( "<script language="javascript">" );
            sb_Script.Append( " " );
            sb_Script.Append( " " );
            sb_Script.Append( "function cb_vefify(val) {" );
            sb_Script.Append( " " );
            sb_Script.Append("var val =document.getElementById(val.controltovalidate);");
            sb_Script.Append( " " );
            sb_Script.Append( "var col = val.all;" );
            sb_Script.Append( " " );
            sb_Script.Append( "if ( col != null ) {" );
            sb_Script.Append( " " );
            sb_Script.Append( "for ( i = 0; i < col.length; i++ ) {" );
            sb_Script.Append( " " );
            sb_Script.Append( "if (col.item(i).tagName.toUpperCase() == "INPUT") {" );
            sb_Script.Append( " " );
            sb_Script.Append( "if ( col.item(i).checked ) {" );
            sb_Script.Append( " " );
            sb_Script.Append( " " );
            sb_Script.Append( "return true;" );
            sb_Script.Append( " " );
            sb_Script.Append( "}" );
            sb_Script.Append( " " );
            sb_Script.Append( "}" );
            sb_Script.Append( " " );
            sb_Script.Append( "}" );
            sb_Script.Append( " " );
            sb_Script.Append( " " );
            sb_Script.Append( " " );
            sb_Script.Append( "return false;" );
            sb_Script.Append( " " );
            sb_Script.Append( "}" );
            sb_Script.Append( " " );
            sb_Script.Append( "}" );
            sb_Script.Append( " " );
            sb_Script.Append( "</script>" );
            if(!this.Page.IsClientScriptBlockRegistered("RBLScript"))
            ...{
                this.Page.RegisterClientScriptBlock( "RBLScript", sb_Script.ToString() );
            }
   
        }

    }

}

2、页面

<%...@ Register TagPrefix="AgrExibition" Namespace="AgrExibition.Common.Framework.Util" Assembly="AgrExibition.Common.Framework"%>
<asp:CheckBoxList id="cbB_Property" runat="server" RepeatDirection="Horizontal" RepeatColumns="3">
                <asp:ListItem Value="1">投资商</asp:ListItem>
                <asp:ListItem Value="2">投资促进机构</asp:ListItem>
                <asp:ListItem Value="3">代理商</asp:ListItem>
                <asp:ListItem Value="4">科研及信息单位协会</asp:ListItem>
                <asp:ListItem Value="5">零售商</asp:ListItem>
                <asp:ListItem Value="6">批发商</asp:ListItem>
                <asp:ListItem Value="7">仓储业</asp:ListItem>
                <asp:ListItem Value="8">跨国公司</asp:ListItem>
                <asp:ListItem Value="9">进出口商</asp:ListItem>
                <asp:ListItem Value="10">生产商</asp:ListItem>
                <asp:ListItem Value="11">超市</asp:ListItem>
                <asp:ListItem Value="12">酒店</asp:ListItem>
                <asp:ListItem Value="13">宾馆及后勤服务</asp:ListItem>
                <asp:ListItem Value="-1">其他</asp:ListItem>
            </asp:CheckBoxList>
            <asp:TextBox id="txtB_Property" Runat="Server" CssClass="input2" Width="400px" />
            <AgrExibition:RADIOBUTTONLISTREQUIREDFIELDVALIDATOR id="rbValid1" Display="Dynamic" ErrorMessage="请选择或输入业务性质！"
                runat="server" ControlToValidate="cbB_Property" Text="*">*</AgrExibition:RADIOBUTTONLISTREQUIREDFIELDVALIDATOR>
<br/>
<asp:CheckBoxList id="cbPurpose" runat="server" RepeatDirection="Horizontal" RepeatColumns="3">
                <asp:ListItem Value="1">采购产品</asp:ListItem>
                <asp:ListItem Value="2">搜集市场信息</asp:ListItem>
                <asp:ListItem Value="3">与业务伙伴会面</asp:ListItem>
                <asp:ListItem Value="4">了解行业动向</asp:ListItem>
                <asp:ListItem Value="5">观看观摩</asp:ListItem>
                <asp:ListItem Value="6">投资项目洽谈</asp:ListItem>
                <asp:ListItem Value="7">获取行业信息</asp:ListItem>
                <asp:ListItem Value="8">寻找供应商或买家</asp:ListItem>
                <asp:ListItem Value="-1">其他</asp:ListItem>
            </asp:CheckBoxList>
            <asp:TextBox id="txtPurpose" Runat="Server" CssClass="input2" Width="400px" />
            <AgrExibition:RADIOBUTTONLISTREQUIREDFIELDVALIDATOR id="rbValid2" Display="Dynamic" ErrorMessage="请选择或输入参会目的!"
                runat="server" ControlToValidate="cbPurpose" Text="*">*</AgrExibition:RADIOBUTTONLISTREQUIREDFIELDVALIDATOR>
        <asp:ValidationSummary id="ValidationSummary1" runat="server" ShowMessageBox="True" ShowSummary="False"
    HeaderText="请检查输入表单内容:"></asp:ValidationSummary>

二、基于.net 2.0
1、类文件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ShiXun.Commoon.Web.Validor
...{
   
   欢迎与邀月交流,net技术与软件架构 2007/07/26#region downmoon 2007/07/26
    /**//// <summary>
    /// 一个Page页面多个CheckBoxList的客户端验证(.net2.0实现)(downmoon)
    /// </summary>
    #endregion
   
    [DefaultProperty("ErrorMessage"), ToolboxData("<{0}:ListControlRequiredFieldValidator runat=server></{0}:ListControlRequiredFieldValidator>")]
    public class ListControlRequiredFieldValidator : BaseValidator
    ...{
        /**//// <summary>
        /// Validator Requirement
        /// </summary>

        /// <returns>True if dependencies are valid.</returns>
        protected override bool ControlPropertiesValid()
        ...{
            Control controlToValidate = FindControl(ControlToValidate) as ListControl;
            return (controlToValidate != null);
        }

        /**//// <summary>
        /// Validator Requirement
        /// </summary>
        /// <returns>true if ControlToValidate 
        /// has one item or more selected</returns>

        protected override bool EvaluateIsValid()
        ...{
            return this.EvaluateIsChecked();
        }

        /**//// <summary>
        /// Return true if an item in the list is selected.
        /// </summary>
        /// <returns>true if ControlToValidate 
        ///      has one item or more selected</returns>
        protected bool EvaluateIsChecked()
        ...{
            ListControl listToValidate = ((ListControl)this.FindControl(this.ControlToValidate));

            foreach (ListItem li in listToValidate.Items)
            ...{
                if (li.Selected == true)
                    return true;
            }
            return false;
        }

        /**//// <summary>

        /// Pre Render
        /// </summary>
        /// <param name="e"></param >
        protected override void OnPreRender(EventArgs e)
        ...{
            System.Web.HttpContext.Current.Trace.Write("Override OnPreRender");
            if (this.DetermineRenderUplevel() && this.EnableClientScript)
            ...{
                Page.ClientScript.RegisterExpandoAttribute(this.ClientID, "evaluationfunction", "ListItemVerify");
                Page.ClientScript.RegisterExpandoAttribute(this.ClientID, "minimumNumberOfSelectedCheckBoxes", "1");

                //System.Web.UI.Page.(this.ClientID, "evaluationfunction", "ListItemVerify");
                //Page.ClientScript.RegisterExpandoAttribute(this.ClientID, "minimumNumberOfSelectedCheckBoxes", "1"); 


                //TODO: imporove to allow variable number.
                this.RegisterClientScript();
            }
            else
            ...{
                this.Attributes.Remove("evaluationfunction");
            }
            base.OnPreRender(e);
        }

        /**//// <summary>
        /// Register the client script.
        /// </summary>

        protected void RegisterClientScript()
        ...{
            string script = @"

            <script language=""javascript"">
            function ListItemVerify(val) 
            {
                var control = document.getElementById(val.controltovalidate);
                var minimumNumberOfSelectedCheckBoxes = parseInt(val.minimumNumberOfSelectedCheckBoxes);
                var selectedItemCount = 0;
                var liIndex = 0;
                var currentListItem = document.getElementById(control.id + '_' + liIndex.toString());
                while (currentListItem != null)
                {
                    if (currentListItem.checked) selectedItemCount++;
                    liIndex++;
                    currentListItem = document.getElementById(control.id + '_' + liIndex.toString());
                }
                return selectedItemCount >= minimumNumberOfSelectedCheckBoxes;
            }
            </script>
            ";

            this.Page.ClientScript.RegisterClientScriptBlock(typeof(ListControlRequiredFieldValidator), "ListRequiredValidator_Script", script);
        }

    }
}

2、页面

<%...@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%...@ Register TagPrefix="ShiXun" NameSpace="ShiXun.Commoon.Web.Validor" Assembly="ShiXun.Commoon.Web.Validor" %>

<!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">
   <asp:CheckBoxList id="cbB_Property" runat="server" RepeatDirection="Horizontal" RepeatColumns="3">
                <asp:ListItem Value="1">投资商</asp:ListItem>
                <asp:ListItem Value="2">投资促进机构</asp:ListItem>
                <asp:ListItem Value="3">代理商</asp:ListItem>
                <asp:ListItem Value="4">科研及信息单位协会</asp:ListItem>
                <asp:ListItem Value="5">零售商</asp:ListItem>
                <asp:ListItem Value="6">批发商</asp:ListItem>
                <asp:ListItem Value="7">仓储业</asp:ListItem>
                <asp:ListItem Value="8">跨国公司</asp:ListItem>
                <asp:ListItem Value="9">进出口商</asp:ListItem>
                <asp:ListItem Value="10">生产商</asp:ListItem>
                <asp:ListItem Value="11">超市</asp:ListItem>
                <asp:ListItem Value="12">酒店</asp:ListItem>
                <asp:ListItem Value="13">宾馆及后勤服务</asp:ListItem>
                <asp:ListItem Value="-1">其他</asp:ListItem>
            </asp:CheckBoxList>
            <ShiXun:ListControlRequiredFieldValidator
    ControlToValidate="cbB_Property" 
    display="Dynamic" 
    ErrorMessage="至少选择一项！" 
    EnableClientScript="true" 
    runat="Server">
    至少选择一项
</ShiXun:ListControlRequiredFieldValidator>
        <br />
        <br />
        <asp:CheckBoxList ID="cbPurpose" runat="server" RepeatColumns="3" RepeatDirection="Horizontal">
            <asp:ListItem Value="1">采购产品</asp:ListItem>
            <asp:ListItem Value="2">搜集市场信息</asp:ListItem>
            <asp:ListItem Value="3">与业务伙伴会面</asp:ListItem>
            <asp:ListItem Value="4">了解行业动向</asp:ListItem>
            <asp:ListItem Value="5">观看观摩</asp:ListItem>
            <asp:ListItem Value="6">投资项目洽谈</asp:ListItem>
            <asp:ListItem Value="7">获取行业信息</asp:ListItem>
            <asp:ListItem Value="8">寻找供应商或买家</asp:ListItem>
            <asp:ListItem Value="-1">其他</asp:ListItem>
        </asp:CheckBoxList>
        <ShiXun:ListControlRequiredFieldValidator
    ControlToValidate="cbPurpose" 
    display="Dynamic" 
    ErrorMessage="至少选择一项！" 
    EnableClientScript="true" 
    runat="Server">
    至少选择一项
</ShiXun:ListControlRequiredFieldValidator>
        <br />
        <asp:CheckBoxList ID="cbChannel" runat="server" RepeatColumns="3" RepeatDirection="Horizontal">
            <asp:ListItem Value="1">报纸等平面媒体</asp:ListItem>
            <asp:ListItem Value="2">网络</asp:ListItem>
            <asp:ListItem Value="3">电视</asp:ListItem>
            <asp:ListItem Value="4">朋友介绍</asp:ListItem>
            <asp:ListItem Value="5">客户推荐</asp:ListItem>
            <asp:ListItem Value="-1">其他</asp:ListItem>
        </asp:CheckBoxList>
        <ShiXun:ListControlRequiredFieldValidator
    ControlToValidate="cbChannel" 
    display="Dynamic" 
    ErrorMessage="至少选择一项！" 
    EnableClientScript="true" 
    runat="Server">
    至少选择一项
</ShiXun:ListControlRequiredFieldValidator>
        <asp:TextBox ID="txtSourceChannel" runat="Server" CssClass="input2" Width="400px"></asp:TextBox>
        <br />
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" />
    </form>
</body>
</html>