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How to Get the CheckBoxlist Value using JavaScript?

, 18 Sep 2007 CPOL
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I am using checkboxlist in ASP.NET 2.0 C#.I bind a list of records in checklistbox from DB. I could not get the value from JavaScript.


We have to update the checkboxlist into a new control say name:"CheckBoxListExCtrl" which can inherit checkboxlist property.


CheckBoxList extension.

Using the Code

Create a new control by the following steps.

Step 1

Create a class library project:

using System;
using System.Collections.Generic; 
using System.Text; 
using System.Globalization; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
namespace CheckBoxListExCtrl 
public class CheckBoxListExCtrl :CheckBoxList, IRepeatInfoUser 
 void IRepeatInfoUser.RenderItem(ListItemType itemType, 
	int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) 
     writer.WriteAttribute("type", "checkbox"); 
     writer.WriteAttribute("name", UniqueID); 
     writer.WriteAttribute("id", ClientID + "_" + 
     writer.WriteAttribute("value", Items[repeatIndex].Value); 
     System.Web.UI.AttributeCollection attrs = Items[repeatIndex].Attributes; 
     foreach (string key in attrs.Keys) 
        writer.WriteAttribute(key, attrs[key]);

Step 2

Build it into a *.dll file,and add it to toolbox of VS.NET. Then you can use it from your project.

Step 3

When we add this control into *.aspx page, the& following code is generated.

<checkboxlistexctrl id="CheckBoxListExCtrl1" runat="server"></checkboxlistexctrl>

Step 4

From the code behind, we have to write code to bind the CheckBoxListExCtrl control.

protected void PopulateCheckBoxListExCtrl() 
   CheckBoxListExCtrl.DataSource = DtRecords;//DataTable DtRecords from DB
   CheckBoxListExCtrl.DataTextField ="Column1"; 
   CheckBoxListExCtrl.DataValueField ="Column2"; 

Step 5

Then we can get the checkbox list value easily by:



  • 19th September, 2007: Initial post


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Trilochan Nayak.
Software Developer (Senior) Tata Consultancy Services Ltd
India India
Trilochan Nayak is a B.TECH graduate from Institute of Engineering and Management,Kolkata.
He is proficient in:
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Comments and Discussions

GeneralThanks PinmemberRavishRanjane7-Oct-09 6:56 
GeneralGetting only the value of the first item PinmemberpalluCodeProject7-Mar-09 16:29 
GeneralGreat Article Pinmemberrameshsethu2-Dec-08 11:55 
AnswerStartIndex error & persistance issues PinmemberMember 97937818-Jun-08 3:23 
GeneralRe: StartIndex error & persistance issues PinmemberTrilochan Nayak.13-Aug-08 22:24 
GeneralGood Article PinmemberAnil R28-Mar-08 6:00 
GeneralUseful PinmemberKen Hales19-Oct-07 9:51 
GeneralHey dude u helped of a article of it's kind PinmemberRitesh K Singh19-Sep-07 5:06 
GeneralGreat Artilcle PinmemberMatrix.18-Sep-07 22:04 

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