how to implement onscroll loading in asp.net c#

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i uses this code but it repeats the same data at every on scroll load please give any idea to solve this prob

my.aspx page

<script type="text/javascript">
    var pageIndex = 1;
    var pageCount;
    $(window).scroll(function () {
        if ($(window).scrollTop() == $(document).height() - $(window).height()) {
            GetRecords();
        }
    });

    $(function () {
        $("[id$=ItemsList] tr").eq(0).remove();
    });

   
                $("[id$=ItemsList]").append(row);

            }
            $.ajax({
                type: "POST",
                url: "Latest-Products-in-greater-noida.aspx/GetLatestProd",
                data: '{pageIndex: ' + pageIndex + '}',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: OnSuccess,
                failure: function (response) {
                    alert(response.d);
                },
                error: function (response) {
                    alert(response.d);
                }
            });
        }
    }

    //Function to recieve XML response append rows to GridView
    function OnSuccess(response) {
        var xmlDoc = $.parseXML(response.d);
        var xml = $(xmlDoc);
        pageCount = parseInt(xml.find("PageCount").eq(0).find("PageCount").text());
        var Products = xml.find("Products");        
        $("[id$=ItemsList] .loader").remove();
        Products.each(function () {
            var Product = $(this);
            var row = $("[id$=ItemsList] tr").eq(0).clone(true);
            $(".discount", row).html(Product.find("Discount").text());
            $(".product_Id", row).html(Product.find("Product_Id").text());
            $(".product_Name", row).html(Product.find("Product_Name").text());
            $(".print_Price", row).html(Product.find("Print_Price").text());
            $(".selling_Price", row).html(Product.find("Selling_Price").text());
            $(".status", row).html(Product.find("status").text());
            $(".category", row).html(Product.find("Category").text());
            $(".image_Name", row).html(Product.find("Image_Name").text());
            $("[id$=ItemsList]").append(row);
        });

        //Hide Loader
        $("#loader").hide();
    }
</script>
 
                    <asp:DataList ID="ItemsList" BorderColor="black" CellPadding="7" CellSpacing="0"
                        RepeatDirection="Horizontal" RepeatLayout="Table" RepeatColumns="5" BorderWidth="0"
                        runat="server" OnItemCommand="ItemsList_ItemCommand">
                        <ItemTemplate>
                            <div class="latestproduct" style="margin-removed 32px; margin-removed 20px;">
                                <table cellpadding="0" cellspacing="0" class="latestproducttbl">
                                    <tr>
                                        <td style="height: 44px;">
                                            <div class="discountcat">
                                                <table cellpadding="0" cellspacing="0" class="discountcattbl">
                                                    <tr>
                                                        <td style="font-size: 14px; color: White; padding-removed 8px;">
                                                            <%#DataBinder.Eval(Container.DataItem, "Discount")%>%
                                                        </td>
                                                    </tr>
                                                    <tr>
                                                        <td style="color: White;">
                                                            off
                                                        </td>
                                                    </tr>
                                                </table>
                                            </div>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td style="height: 150px;">
                                            <div class="proimage">
                                                <asp:ImageButton ID="ImageButton1" runat="server" CommandName="Details" CommandArgument='<%# Eval("Product_Id") + "," + Eval("Product_Name")%>'
                                                    ImageUrl='<%# Bind("Image_Name", "~/Admin/ProductImage/{0}") %>' Width="140px"
                                                    Height="150px" />
                                            </div>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td style="text-align: center; height: 40px; font-size: 14px; padding: 0px 7px 0px 7px;
                                            vertical-align: top; color: #0875a3;">
                                            <asp:LinkButton ID="LinkButton2" runat="server" CommandName="Details" CommandArgument='<%# Eval("Product_Id") + "," + Eval("Product_Name")%>'
                                                CssClass="lnkpname"><%#DataBinder.Eval(Container.DataItem, "Product_Name")%></asp:LinkButton>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td class="tblprice">
                                            <span class="reduce">Rs.
                                                <asp:LinkButton ID="LinkButton3" runat="server" CommandName="Details" CommandArgument='<%# Eval("Product_Id") + "," + Eval("Product_Name")%>'
                                                    CssClass="reduce"> <%#DataBinder.Eval(Container.DataItem, "Print_Price")%></asp:LinkButton></span>   
                                            Rs.class="sellprice"><asp:LinkButton ID="LinkButton1" runat="server"
                                                CommandName="Details" CommandArgument='<%# Eval("Product_Id") + "," + Eval("Product_Name")%>' CssClass="lnkdtl"
                                                ForeColor="#CD0000"><%#DataBinder.Eval(Container.DataItem, "Selling_Price")%></asp:LinkButton>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td style="text-align: center; height: 50px;">
                                            <asp:LinkButton ID="LinkButton4" runat="server" CommandName="Details" CommandArgument='<%# Eval("Product_Id") + "," + Eval("Product_Name")%>'
                                                CssClass="shopnow">Shop Now</asp:LinkButton>
                                        </td>
                                    </tr>
                                </table>
                            </div>
                        </ItemTemplate>
                    </asp:DataList>

my .cs page

C#

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ItemsList.DataSource = GetLatestProdPageWise(1);
            ItemsList.DataBind();
        }
    }

  public static DataSet GetLatestProdPageWise(int pageIndex)
    {
        string constring = ConfigurationManager.ConnectionStrings["Grocery"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constring))
        {
            using (SqlCommand cmd = new SqlCommand("[GetLatestProdPageWise]"))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@PageIndex", pageIndex);
                cmd.Parameters.AddWithValue("@PageSize", 20);
                cmd.Parameters.Add("@PageCount", SqlDbType.Int, 4).Direction = ParameterDirection.Output;
                using (SqlDataAdapter sda = new SqlDataAdapter())
                {
                    cmd.Connection = con;
                    sda.SelectCommand = cmd;
                    using (DataSet ds = new DataSet())
                    {
                        sda.Fill(ds, "Products");
                        DataTable dt = new DataTable("PageCount");
                        dt.Columns.Add("PageCount");
                        dt.Rows.Add();
                        dt.Rows[0][0] = cmd.Parameters["@PageCount"].Value;
                        ds.Tables.Add(dt);
                        return ds;
                    }
                }
            }
        }
    }

    [WebMethod]
    public static string GetLatestProd(int pageIndex)
    {
        //Added to similate delay so that we see the loader working
        //Must be removed when moving to production
        System.Threading.Thread.Sleep(2000);

        return GetLatestProdPageWise(pageIndex).GetXml();
    }

my stored procedure

SQL

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE PROCEDURE [dbo].[GetLatestProdPageWise]
      @PageIndex INT = 1
      ,@PageSize INT = 20
      ,@PageCount INT OUTPUT
AS
BEGIN
      SET NOCOUNT ON;
      SELECT ROW_NUMBER() OVER
            (
                  ORDER BY [ID] ASC
            )AS RowNumber
      ,[Product_Name]
      ,[Product_Id]
      ,[Category]
      ,[Image_Name]
      ,[Selling_Price]
      ,[Print_Price]
      ,[Discount]
      ,[status]
    INTO #Results
      FROM [Product_Inventory] where (Category='Latest Products') and status='1' Order By Date DESC
    
      DECLARE @RecordCount INT
      SELECT @RecordCount = COUNT(*) FROM #Results
 
      SET @PageCount = CEILING(CAST(@RecordCount AS DECIMAL(10, 2)) / CAST(@PageSize AS DECIMAL(10, 2)))
      PRINT       @PageCount
          
      SELECT * FROM #Results
      WHERE RowNumber BETWEEN(@PageIndex -1) * @PageSize + 1 AND(((@PageIndex -1) * @PageSize + 1) + @PageSize) - 1
    
      DROP TABLE #Results
END
GO

Posted 19-Mar-15 1:07am

Kriti Sharma 10400841

Updated 19-Mar-15 1:15am

v6

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Afzaal Ahmad Zeeshan · Answer 1 · 2015-03-19T01:20:00

The actual problem you're facing is because you're only checking the current location of scroll, you're not having a condition to test whether the data has been loaded or not.

Try this,

JavaScript

var pageIndex = 1;
var pageCount;

// condition for loading data
var loaded = false;
$(window).scroll(function () {
    if ($(window).scrollTop() == $(document).height() - $(window).height() 
        // AND operator to test whether it has been loaded or not
        && !loaded) {
        GetRecords();
        // Set value to true, so it doesn't execute again.
        loaded = true;
    }
});

So, now the variable has been set to true; thus !loaded would result in false and the AND operator would make sure that the code doesn't get executed. Thus, it would load only once; or if you want to it to be executed any other place.