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Selecting multiple checkboxes inside a GridView control

, 3 Aug 2005
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This article describes how you can select checkboxes inside a GridView control.

Introduction

GridView is a new data bound control introduced by Microsoft in Visual Studio .NET 2005. Most of the operations like sorting, paging and selecting items from the GridView are already built in and you can use it through the design view. In this article, I will explain how you can select single as well as all the checkboxes which are inside a GridView control.

Selecting Checkboxes inside the GridView Control

GridView has a CheckboxField column which maps the checkbox to a field in the database. In this article we won't be using that, we will make a checkbox in a template column. Simply add a asp:checkbox control in the item template of the GridView control. If you are working with a DataGrid control and want the same functionality, then please check out my article: Selecting multiple checkboxes inside a DataGrid control.

The HTML code looks something like this:

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
   AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="PersonID" 
   DataSourceID="mySource" Width="366px" CellPadding="4" 
   ForeColor="#333333" GridLines="None">
 <Columns>
   <asp:CommandField ShowSelectButton="True" />
   <asp:BoundField DataField="PersonID" HeaderText="PersonID" 
         InsertVisible="False" ReadOnly="True" SortExpression="PersonID" />
   <asp:BoundField DataField="Name" HeaderText="Name" 
                                       SortExpression="Name" />
   <asp:TemplateField HeaderText="Select">
    <ItemTemplate>
       <asp:CheckBox ID="chkSelect" runat="server" />
    </ItemTemplate>
    <HeaderTemplate>
    </HeaderTemplate>
   </asp:TemplateField>

 </Columns>

 <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
 <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
 <PagerStyle BackColor="#FFCC66" ForeColor="#333333" 
                           HorizontalAlign="Center" />
 <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
 <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
 <AlternatingRowStyle BackColor="White" />
</asp:GridView>

Now in the button click event, write this code:

// StringBuilder object
StringBuilder str = new StringBuilder();

// Select the checkboxes from the GridView control
for (int i = 0; i < GridView1.Rows.Count; i++)
{
  GridViewRow row = GridView1.Rows[i];
  bool isChecked = ((CheckBox) row.FindControl("chkSelect")).Checked;

  if (isChecked)
  {
    // Column 2 is the name column
    str.Append(GridView1.Rows[i].Cells[2].Text);
  }
}

// prints out the result
Response.Write(str.ToString());

The code above just iterates through the GridView and selects the checked checkboxes. Later it appends the selected value to a StringBuilder object. In order to use StringBuilder you will need to add the System.Text namespace.

Making a CheckAll functionality

To add a check-all functionality in the GridView, simply add a HTML CheckBox to the header template of the checkbox column.

<HeaderTemplate>
  <input id="chkAll" onclick="javascript:SelectAllCheckboxes(this);" 
              runat="server" type="checkbox" />
</HeaderTemplate>

SelectAllCheckboxes JavaScript method:

<script language="javascript">

 function SelectAllCheckboxes(spanChk){

   // Added as ASPX uses SPAN for checkbox
   var oItem = spanChk.children;
   var theBox= (spanChk.type=="checkbox") ? 
        spanChk : spanChk.children.item[0];
   xState=theBox.checked;
   elm=theBox.form.elements;

   for(i=0;i<elm.length;i++)
     if(elm[i].type=="checkbox" && 
              elm[i].id!=theBox.id)
     {
       //elm[i].click();
       if(elm[i].checked!=xState)
         elm[i].click();
       //elm[i].checked=xState;
     }
 }
</script>

This is it. I hope you like the article, happy coding!

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About the Author

azamsharp
Web Developer
United States United States
I am the founder of knowledge base website, HighOnCoding, GridViewGuy, RefactorCode.com and ScreencastADay.com.
 
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Comments and Discussions

 
GeneralUpdate Database Pinmemberpmosborne19-Jan-11 11:05 
GeneralGridview Pinmemberragini123021-Nov-10 20:46 
GeneralMy vote of 1 Pinmemberadolfhardik3-Jun-10 23:21 
QuestionHow to Invoke Child Listview controls' Edit and Update Events Pinmemberrenil64912-May-10 5:07 
QuestionMaster Page Pinmembervicky_geek28-Apr-10 4:51 
AnswerRe: Master Page Pinmemberazamsharp28-Apr-10 4:59 
GeneralRe: Master Page Pinmembervicky_geek28-Apr-10 19:17 
GeneralAutoPlay From the List Pinmembervondon17-Feb-10 8:56 
Generalit works great PinmemberAnilMiLaN26-Nov-09 18:16 
QuestionHow to bring Old state to the checkboxes of the gridview control when the postback occurs PinmemberRajeshgut14-Oct-09 3:40 
AnswerRe: How to bring Old state to the checkboxes of the gridview control when the postback occurs Pinmemberazamsharp28-Apr-10 5:00 
QuestionCan you do this without forms Pinmembercheesehead9118229-Sep-09 7:50 
QuestionHow to select a checkbox with ctrl and click instead of click Pinmemberemily022823-Jun-09 9:15 
GeneralNice article PinmemberDonsw18-Apr-09 10:21 
GeneralPlz can u help PinmemberMehul_qaz16-Apr-09 3:52 
Generalnice article Pinmemberkanza azhar12-Apr-09 3:37 
QuestionCheckboxes and GridView paging [modified] Pinmemberboqboq2-Mar-09 1:58 
AnswerRe: Checkboxes and GridView paging PinmembercUbeindaclUb5-Sep-11 23:37 
QuestionBeautiful!...How can I have 2 gridviews on a page and NOT have them control each other? PinmemberBrian Fay9-Feb-09 11:51 
AnswerRe: Beautiful!...How can I have 2 gridviews on a page and NOT have them control each other? Pinmemberazamsharp11-Feb-09 7:50 
GeneralExcelente Mi Amigo. Sos pero jodido. PinmemberLuis Rangel4-Feb-09 6:34 
GeneralAA - Awesome Azam! Pinmemberplanetregin23-Dec-08 4:39 
Generalgood PinmemberMember 273824627-Aug-08 22:33 
GeneralThank you for the great article Pinmemberjitendra v patil22-Aug-08 0:11 
QuestionSessions questions PinmemberManigandanmax2cs16-Jul-08 0:31 

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