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

本文链接：https://blog.youkuaiyun.com/downmoon/article/details/1709929

本文提供了一个Page页面中多个CheckBoxList的客户端验证实现方案，包括基于.net1.1和.net2.0的不同实现方式，并展示了具体的代码示例。

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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

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( "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( "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( "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

[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 = @"

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 />

< 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 />

< asp:Button ID ="Button1" runat ="server" Text ="Button" />

</ form >

</ body >

</ html >