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Selecting / Deselecting all the CheckBoxes Inside a GridView

, 9 May 2008 CPOL
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This article describes how to select and unselect all the checkboxes inside a GridView control.

Preview.gif

Introduction

I am going to present here a functionality that selects / deselects all checkboxes of a particular column inside a GridView control, provided the header checkbox of that column is checked or unchecked using JavaScript. This functionality also has a feature that when all checkboxes of a particular column inside the GridView are checked, then the header checkbox gets checked, and vice versa.

Using the code

I have used a TemplateField inside the GridView and put a CheckBox in the ItemTemplate as well as another CheckBox in the HeaderTemplate of the TemplateField.

The HTML code looks like this:

<asp:GridView ID="gvCheckboxes" runat="server" 
              AutoGenerateColumns="False" OnRowCreated="gvCheckboxes_RowCreated">
   <Columns>
      <asp:BoundField HeaderText="S.N." DataField="sno">
         <HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="50px" />
         <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="50px" />
      </asp:BoundField>
      <asp:TemplateField HeaderText="Select">
         <ItemTemplate>
            <asp:CheckBox ID="chkBxSelect" runat="server" />
         </ItemTemplate>
         <HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="50px" />
         <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="50px" />
         <HeaderTemplate>
            <asp:CheckBox ID="chkBxHeader" 
                 onclick="javascript:HeaderClick(this);" runat="server" />
         </HeaderTemplate>
      </asp:TemplateField>
      <asp:TemplateField>
         <ItemTemplate>
            <asp:CheckBox ID="chkBx" runat="server" />
         </ItemTemplate>
         <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="50px" />
      </asp:TemplateField>
   </Columns>
   <RowStyle BackColor="Moccasin" />
   <AlternatingRowStyle BackColor="NavajoWhite" />
   <HeaderStyle BackColor="DarkOrange" Font-Bold="true" ForeColor="white" />
</asp:GridView>

Attach a client-side onclick event on the header checkbox [chkBxHeader].

<asp:CheckBox ID="chkBxHeader" onclick="javascript:HeaderClick(this);" runat="server" /> 

Put the following code in the GridView's RowCreated event:

if (e.Row.RowType == DataControlRowType.DataRow && 
   (e.Row.RowState == DataControlRowState.Normal ||
    e.Row.RowState == DataControlRowState.Alternate))
{
   CheckBox chkBxSelect = (CheckBox)e.Row.Cells[1].FindControl("chkBxSelect");
   CheckBox chkBxHeader = (CheckBox)this.gvCheckboxes.HeaderRow.FindControl("chkBxHeader");
   chkBxSelect.Attributes["onclick"] = string.Format
                                          (
                                             "javascript:ChildClick(this,'{0}');",
                                             chkBxHeader.ClientID
                                          );
}

In the above code, a client side onclick event has been attached to the child checkbox [chkBxChild].

Add this JavaScript in the page’s head section:

<script type="text/javascript">
var TotalChkBx;
var Counter;

window.onload = function()
{
   //Get total no. of CheckBoxes in side the GridView.
   TotalChkBx = parseInt('<%= this.gvCheckboxes.Rows.Count %>');

   //Get total no. of checked CheckBoxes in side the GridView.
   Counter = 0;
}

function HeaderClick(CheckBox)
{
   //Get target base & child control.
   var TargetBaseControl = 
       document.getElementById('<%= this.gvCheckboxes.ClientID %>');
   var TargetChildControl = "chkBxSelect";

   //Get all the control of the type INPUT in the base control.
   var Inputs = TargetBaseControl.getElementsByTagName("input");

   //Checked/Unchecked all the checkBoxes in side the GridView.
   for(var n = 0; n < Inputs.length; ++n)
      if(Inputs[n].type == 'checkbox' && 
                Inputs[n].id.indexOf(TargetChildControl,0) >= 0)
         Inputs[n].checked = CheckBox.checked;

   //Reset Counter
   Counter = CheckBox.checked ? TotalChkBx : 0;
}

function ChildClick(CheckBox, HCheckBox)
{
   //get target control.
   var HeaderCheckBox = document.getElementById(HCheckBox);

   //Modifiy Counter; 
   if(CheckBox.checked && Counter < TotalChkBx)
      Counter++;
   else if(Counter > 0) 
      Counter--;

   //Change state of the header CheckBox.
   if(Counter < TotalChkBx)
      HeaderCheckBox.checked = false;
   else if(Counter == TotalChkBx)
      HeaderCheckBox.checked = true;
}
</script>

In the above script, there are two global variables: TotalChkBx and Counter. These are initialised in the window.onload event. There are two methods: HeaderClick and ChildClick. The method HeaderClick checks / unchecks all checkboxes of a particular column inside the GridView depending upon whether the header checkbox is checked or unchecked. The method ChildClick checks / unchecks the header checkbox depending upon whether all checkboxes of a particular column inside the GridView are checked or unchecked.

Just download the sample application and enjoy coding! I hope you will like this article.

Supported browsers

I have tested this script on the following browsers:

Browsers.png

License

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

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About the Author

Samir NIGAM
Technical Lead Infogain India Pvt Ltd
India India

Samir NIGAM is a Microsoft Certified Professional. He is an insightful IT professional with results-driven comprehensive technical skill having rich, hands-on work experience n web-based applications using ASP.NET, C#, AJAX, Web Service, WCF, jQuery, Microsoft Enterprise Library , LINQ, MS Entity Framework, nHibernate, MS SQL Server & SSRS.

He has earned his master degree (MCA) from U.P. Technical University, Lucknow, INDIA, his post graduate dipoma (PGDCA ) from Institute of Engineering and Rural Technology, Allahabad, INDIA and his bachelor degree (BSc - Mathematics) from University of Allahabad, Allahabad, INDIA.

He has good knowledge of Object Oriented Programming, n-Tier Architecture, SOLID Principle, and Algorithm Analysis & Design as well as good command over cross-browser client side programming using JavaScript & jQuery,.

Awards:


Comments and Discussions

 
GeneralThanks! Pin
yaroopig17-Nov-11 16:32
memberyaroopig17-Nov-11 16:32 
GeneralMy vote of 5 Pin
Manu K.Jayadev26-May-11 0:38
memberManu K.Jayadev26-May-11 0:38 
GeneralMy vote of 5 Pin
theintoehan10-Mar-11 19:26
membertheintoehan10-Mar-11 19:26 
GeneralMy vote of 5 Pin
ankurbhutani26-Feb-11 9:25
memberankurbhutani26-Feb-11 9:25 
GeneralMy vote of 5 Pin
Thrinath reddy25-Feb-11 1:28
memberThrinath reddy25-Feb-11 1:28 
GeneralMy vote of 5 Pin
jcrussell23-Feb-11 1:34
memberjcrussell23-Feb-11 1:34 
GeneralSlight Change Pin
jcrussell23-Feb-11 1:32
memberjcrussell23-Feb-11 1:32 
GeneralMy vote of 5 Pin
noblevaibhav4-Feb-11 7:04
membernoblevaibhav4-Feb-11 7:04 
GeneralMy vote of 5 Pin
soul negi21-Sep-10 3:46
membersoul negi21-Sep-10 3:46 
GeneralPb with value rows.count() Pin
gdoub12-Apr-10 4:38
membergdoub12-Apr-10 4:38 
Generalwell done Pin
Donsw18-Apr-09 11:34
memberDonsw18-Apr-09 11:34 
GeneralRe: well done Pin
Samir NIGAM14-Sep-09 2:35
mvpSamir NIGAM14-Sep-09 2:35 
GeneralHelpful article Pin
Sanjay4India6-Apr-09 2:40
memberSanjay4India6-Apr-09 2:40 
GeneralRe: Helpful article Pin
Samir NIGAM14-Sep-09 2:36
mvpSamir NIGAM14-Sep-09 2:36 
GeneralRe: Helpful article Pin
Samir NIGAM17-Sep-09 11:09
mvpSamir NIGAM17-Sep-09 11:09 
QuestionNot working inside UpdatePanel Pin
Tamil Mannan9-Mar-09 21:12
memberTamil Mannan9-Mar-09 21:12 
AnswerRe: Not working inside UpdatePanel Pin
Samir NIGAM14-Sep-09 2:52
mvpSamir NIGAM14-Sep-09 2:52 
Generalsimplified version Pin
Jim Brooks24-Feb-09 11:44
memberJim Brooks24-Feb-09 11:44 
GeneralRe: simplified version Pin
Samir NIGAM14-Sep-09 2:55
mvpSamir NIGAM14-Sep-09 2:55 
Generalissue with paging on postback with filtered records Pin
svknair27-Jan-09 2:32
membersvknair27-Jan-09 2:32 
GeneralRe: issue with paging on postback with filtered records Pin
Samir NIGAM14-Sep-09 2:59
mvpSamir NIGAM14-Sep-09 2:59 
Generalerror in using the selectall checkbox Pin
svknair27-Jan-09 2:22
membersvknair27-Jan-09 2:22 
GeneralRe: error in using the selectall checkbox Pin
Samir NIGAM14-Sep-09 2:57
mvpSamir NIGAM14-Sep-09 2:57 
GeneralPaging Issue Pin
CoolBreeze81230-May-08 5:10
memberCoolBreeze81230-May-08 5:10 
GeneralRe: Paging Issue Pin
SAMir Nigam 30-May-08 20:27
member SAMir Nigam 30-May-08 20:27 
GeneralRe: Paging Issue Pin
CoolBreeze81231-May-08 4:26
memberCoolBreeze81231-May-08 4:26 
GeneralError when datasource is empty Pin
Petr Stejskal4-May-08 10:54
memberPetr Stejskal4-May-08 10:54 
GeneralRe: Error when datasource is empty Pin
Samir Nigam 6-May-08 20:46
member Samir Nigam 6-May-08 20:46 
Generalhi Pin
Mohamad Kaifi2-May-08 19:23
memberMohamad Kaifi2-May-08 19:23 
GeneralRe: hi Pin
Samir Nigam 2-May-08 19:29
member Samir Nigam 2-May-08 19:29 
GeneralRe: hi Pin
Mohamad Kaifi2-May-08 19:32
memberMohamad Kaifi2-May-08 19:32 
GeneralRe: hi Pin
Samir Nigam 3-May-08 0:51
member Samir Nigam 3-May-08 0:51 
Questionhow to include javascript functions instead of placing in the aspx file? Pin
Petr Stejskal1-May-08 9:46
memberPetr Stejskal1-May-08 9:46 
AnswerRe: how to include javascript functions instead of placing in the aspx file? [modified] Pin
Samir Nigam 1-May-08 20:17
member Samir Nigam 1-May-08 20:17 
GeneralRe: how to include javascript functions instead of placing in the aspx file? Pin
tfpayne7224-Nov-08 10:10
membertfpayne7224-Nov-08 10:10 
GeneralRe: how to include javascript functions instead of placing in the aspx file? Pin
Sameer NIGAM24-Nov-08 19:21
memberSameer NIGAM24-Nov-08 19:21 
Questionhow to create dropdownlist option in grid view control Pin
Pragya Khatri24-Feb-08 20:07
memberPragya Khatri24-Feb-08 20:07 
AnswerRe: how to create dropdownlist option in grid view control Pin
SAMir Nigam 21-May-08 19:09
member SAMir Nigam 21-May-08 19:09 
Generalhighlight row Pin
Tim Vandeweerd19-Feb-08 9:38
memberTim Vandeweerd19-Feb-08 9:38 
GeneralRe: highlight row Pin
Samir Nigam 19-Feb-08 17:42
member Samir Nigam 19-Feb-08 17:42 
GeneralExcellent Job..... Pin
D. PAUL17-Feb-08 19:19
memberD. PAUL17-Feb-08 19:19 
GeneralRe: Excellent Job..... Pin
SAMir Nigam 21-May-08 19:06
member SAMir Nigam 21-May-08 19:06 
GeneralPaging Pin
Mark Henke13-Feb-08 5:34
memberMark Henke13-Feb-08 5:34 
GeneralRe: Paging Pin
Samir Nigam 13-Feb-08 21:41
member Samir Nigam 13-Feb-08 21:41 
GeneralRe: Paging Pin
Samir Nigam 13-Feb-08 22:54
member Samir Nigam 13-Feb-08 22:54 
GeneralRe: Paging Pin
Mark Henke14-Feb-08 4:59
memberMark Henke14-Feb-08 4:59 
GeneralRe: Paging Pin
Samir Nigam 14-Feb-08 18:00
member Samir Nigam 14-Feb-08 18:00 
GeneralAdvanced Features When Selected CheckBoxes Inside the GridView Control Pin
azamsharp7-Feb-08 18:06
memberazamsharp7-Feb-08 18:06 
GeneralRe: Advanced Features When Selected CheckBoxes Inside the GridView Control Pin
Samir Nigam 7-Feb-08 22:24
member Samir Nigam 7-Feb-08 22:24 
GeneralRe: Advanced Features When Selected CheckBoxes Inside the GridView Control Pin
Samir Nigam 13-Feb-08 20:48
member Samir Nigam 13-Feb-08 20:48 

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