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 >

转载于:https://www.cnblogs.com/downmoon/archive/2007/12/29/1020089.html