crud operations in asp.net gridview using jquery

<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”CS.aspx.cs” Inherits=”_Default” %> 

<script type="text/javascript">
    $(function () {
        $.ajax({
            type: "POST",
            url: "CS.aspx/GetCustomers",
            data: '{}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: OnSuccess
        });
    });

    function OnSuccess(response) {
        var xmlDoc = $.parseXML(response.d);
        var xml = $(xmlDoc);
        var customers = xml.find("Table");
        var row = $("[id*=gvCustomers] tr:last-child").clone(true);
        $("[id*=gvCustomers] tr").not($("[id*=gvCustomers] tr:first-child")).remove();
        $.each(customers, function () {
            var customer = $(this);
            AppendRow(row, $(this).find("CustomerId").text(), $(this).find("Name").text(), $(this).find("Country").text())
            row = $("[id*=gvCustomers] tr:last-child").clone(true);
        });
    }

    function AppendRow(row, customerId, name, country) {
        //Bind CustomerId.
        $(".CustomerId", row).find("span").html(customerId);

        //Bind Name.
        $(".Name", row).find("span").html(name);
        $(".Name", row).find("input").val(name);

        //Bind Country.
        $(".Country", row).find("span").html(country);
        $(".Country", row).find("input").val(country);
        $("[id*=gvCustomers]").append(row);
    }

    //Add event handler.
    $("body").on("click", "[id*=btnAdd]", function () {
        var txtName = $("[id*=txtName]");
        var txtCountry = $("[id*=txtCountry]");
        $.ajax({
            type: "POST",
            url: "CS.aspx/InsertCustomer",
            data: '{name: "' + txtName.val() + '", country: "' + txtCountry.val() + '" }',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (response) {
                var row = $("[id*=gvCustomers] tr:last-child").clone(true);
                AppendRow(row, response.d, txtName.val(), txtCountry.val());
                txtName.val("");
                txtCountry.val("");
            }
        });
        return false;
    });

    //Edit event handler.
    $("body").on("click", "[id*=gvCustomers] .Edit", function () {
        var row = $(this).closest("tr");
        $("td", row).each(function () {
            if ($(this).find("input").length > 0) {
                $(this).find("input").show();
                $(this).find("span").hide();
            }
        });
        row.find(".Update").show();
        row.find(".Cancel").show();
        row.find(".Delete").hide();
        $(this).hide();
        return false;
    });

    //Update event handler.
    $("body").on("click", "[id*=gvCustomers] .Update", function () {
        var row = $(this).closest("tr");
        $("td", row).each(function () {
            if ($(this).find("input").length > 0) {
                var span = $(this).find("span");
                var input = $(this).find("input");
                span.html(input.val());
                span.show();
                input.hide();
            }
        });
        row.find(".Edit").show();
        row.find(".Delete").show();
        row.find(".Cancel").hide();
        $(this).hide();

        var customerId = row.find(".CustomerId").find("span").html();
        var name = row.find(".Name").find("span").html();
        var country = row.find(".Country").find("span").html();
        $.ajax({
            type: "POST",
            url: "CS.aspx/UpdateCustomer",
            data: '{customerId: ' + customerId + ', name: "' + name + '", country: "' + country + '" }',
            contentType: "application/json; charset=utf-8",
            dataType: "json"
        });

        return false;
    });

    //Cancel event handler.
    $("body").on("click", "[id*=gvCustomers] .Cancel", function () {
        var row = $(this).closest("tr");
        $("td", row).each(function () {
            if ($(this).find("input").length > 0) {
                var span = $(this).find("span");
                var input = $(this).find("input");
                input.val(span.html());
                span.show();
                input.hide();
            }
        });
        row.find(".Edit").show();
        row.find(".Delete").show();
        row.find(".Update").hide();
        $(this).hide();
        return false;
    });

    //Delete event handler.
    $("body").on("click", "[id*=gvCustomers] .Delete", function () {
        if (confirm("Do you want to delete this row?")) {
            var row = $(this).closest("tr");
            var customerId = row.find("span").html();
            $.ajax({
                type: "POST",
                url: "CS.aspx/DeleteCustomer",
                data: '{customerId: ' + customerId + '}',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (response) {
                    row.remove();
                }
            });
        }

        return false;
    });
</script>
</form>

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