Check all checkboxes in GridView using jQuery

Introduction

This is the very basic need when you do bulk operations like email sending, export to excel, delete record etc. from a list. A CheckBox in header on which checked or unchecked all the CheckBoxes in the list should change respectively. Similar thing you can see in Gmail, Hotmail etc. which have more variations to select record.

Using the code 

I have created a Class Employee, add some records to it and bind it to grid. 

public class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
    public string Designation { get; set; }
}

protected void Page_Load(object sender, EventArgs e)
{
    var employees = new List<Employee>()
    {
        new Employee(){ Id = 1, Name = "Ms. Nancy Davolio",     Address = "507 - 20th Ave. E.  Apt. 2A",    Designation = "Sales Representative"},
        new Employee(){ Id = 2, Name = "Dr. Andrew Fuller",     Address = "908 W. Capital Way",             Designation = "Vice President Sales"},
        new Employee(){ Id = 3, Name = "Ms. Janet Leverling",   Address = "722 Moss Bay Blvd.",             Designation = "Sales Representative"},
        new Employee(){ Id = 4,	Name = "Mrs. Margaret Peacock", Address = "4110 Old Redmond Rd.",           Designation = "Sales Representative"},
        new Employee(){ Id = 5,	Name = "Mr. Steven Buchanan",   Address = "14 Garrett Hill",                Designation = "Sales Manager"},
        new Employee(){ Id = 6,	Name = "Mr. Michael Suyama",    Address = "Coventry House  Miner Rd.",      Designation = "Sales Representative"},
        new Employee(){ Id = 7,	Name = "Mr. Robert King",       Address = "Edgeham Hollow  Winchester Way", Designation = "Sales Representative"},
        new Employee(){ Id = 8,	Name = "Ms. Laura Callahan",    Address = "4726 - 11th Ave. N.E.",          Designation = "Inside Sales Coordinator"},
        new Employee(){ Id = 9, Name = "Ms. Anne Dodsworth",    Address = "7 Houndstooth Rd.",              Designation = "Sales Representative"}
    };

    gvEmployees.DataSource = employees;
    gvEmployees.DataBind();
}

This is my Grid Control 

<asp:GridView ID="gvEmployees" runat="server" AutoGenerateColumns="false" CellPadding="4" ForeColor="#333333"
    GridLines="None">
    <AlternatingRowStyle BackColor="White" />
    <Columns>
        <asp:TemplateField>
            <HeaderTemplate>
                <asp:CheckBox runat="server" ID="chkAll" />
            </HeaderTemplate>
            <ItemTemplate>
                <asp:CheckBox runat="server" ID="chkEmployee" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="ID">
            <ItemTemplate>
                <asp:Label runat="server" ID="lblID" Text='<%#Eval("Id") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Name">
            <ItemTemplate>
                <asp:Label runat="server" ID="lblName" Text='<%#Eval("Name") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Address">
            <ItemTemplate>
                <asp:Label runat="server" ID="lblAddress" Text='<%#Eval("Address") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Designation">
            <ItemTemplate>
                <asp:Label runat="server" ID="lblDesignation" Text='<%#Eval("Designation") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
    <EditRowStyle BackColor="#7C6F57" />
    <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#E3EAEB" />
    <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#F8FAFA" />
    <SortedAscendingHeaderStyle BackColor="#246B61" />
    <SortedDescendingCellStyle BackColor="#D4DFE1" />
    <SortedDescendingHeaderStyle BackColor="#15524A" />
</asp:GridView> 

We have two requirements.

1. When top CheckBox checked/unchecked, we have to check/uncheck all the CheckBoxes in the list.

Following function fulfill the requirement. 

$("#<%=gvEmployees.ClientID%> input[id*='chkAll']:checkbox").click(function () {
    //Check/uncheck all checkboxes in list according to main checkbox 
    $("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox").attr('checked', $(this).is(':checked'));
});

2. On each of the list CheckBox checked/unchecked, we have to determine Check/Uncheck top CheckBox.     

$("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox").click(function() {
    //Get number of checkboxes in list either checked or not checked
    var totalCheckboxes = $("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox").size();
    //Get number of checked checkboxes in list
    var checkedCheckboxes = $("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox:checked").size();
    //Check / Uncheck top checkbox if all the checked boxes in list are checked
    $("#<%=gvEmployees.ClientID%> input[id*='chkAll']:checkbox").attr('checked', totalCheckboxes == checkedCheckboxes);
});    

Following is Complete Javascript. 

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(document).ready(function () {
        $("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox").click(function() {
            //Get number of checkboxes in list either checked or not checked
            var totalCheckboxes = $("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox").size();
            //Get number of checked checkboxes in list
            var checkedCheckboxes = $("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox:checked").size();
            //Check / Uncheck top checkbox if all the checked boxes in list are checked
            $("#<%=gvEmployees.ClientID%> input[id*='chkAll']:checkbox").attr('checked', totalCheckboxes == checkedCheckboxes);
        });

        $("#<%=gvEmployees.ClientID%> input[id*='chkAll']:checkbox").click(function () {
            //Check/uncheck all checkboxes in list according to main checkbox 
            $("#<%=gvEmployees.ClientID%> input[id*='chkEmployee']:checkbox").attr('checked', $(this).is(':checked'));
        });
    });
</script>

Thanks and regards.