Get gridview checkbox value jQuery

get gridview selected checkboxes in jquery
In asp.net gridview we show checkboxes to select rows. Some times we need to get checked checkboxes in jQuery to perform some client side operations. in jQuery we need to first get object of gridview and then need to find checked checkboxes inside gridview.

Example to get gridview checked checkboxes in jQuery

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.11/jquery-ui.min.js"></script>
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.11/i18n/jquery-ui-i18n.min.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.1/themes/ui-lightness/jquery-ui.css" type="text/css"/>
    <title>Get checkboxes in gridview using jQuery</title>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#submit").click(function () {
               var $checkedCheckBoxes = $('#<%=GridView1.ClientID %>').find("input:checkbox:checked");
            });
        });
      
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BorderWidth="1px"
            CellPadding="3" BorderStyle="None" Font-Names="Arial">
            <FooterStyle></FooterStyle>
            <PagerStyle HorizontalAlign="Left"></PagerStyle>
            <HeaderStyle Font-Bold="True"></HeaderStyle>
            <Columns>
                <asp:TemplateField HeaderText="Select">
                   <ItemTemplate>
                        <asp:CheckBox ID="CheckBoxPurchase" runat="server" Enabled="true" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField HeaderText="Item No." DataField="ItemNo">
                    <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
                </asp:BoundField>
                <asp:BoundField HeaderText="Item Name" DataField="ItemName">
                    <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
                </asp:BoundField>
            </Columns>
        </asp:GridView>
        <input type="button" id="submit" value="Submit"/>
    </div>
    </form>
</body>
</html>