Hello,

This is my first experience with C# Web Service & AJAX ... I would like to build a page like Facebook that will load the next set of records when we scroll down ...

I'm trying to use the code but it's not working at all ... Can you help me ?

Thank you

Paul

HTML Code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="auto-load.aspx.cs" Inherits="auto_load" %>

<!DOCTYPE html>

<html>
    <head>
        <title>AEM - Comments</title>
    <link href="Style.css" rel="Stylesheet" />

    <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.1.min.js"></script>
    <script>
        var isLoading = false;
        var v_page_number = 1, v_page_size = 5;

        $(document).ready(function () 
        {
            loadComments();

            $(window).scroll(function () 
            {
                // Start loading when 200px from the bottom
                if ($(window).scrollTop() + $(window).height() > $('#main').height() - 200 && !isLoading) 
                {
                    loadComments();
                }
            });
        });

        function loadComments() 
        {
            isLoading = true;

            $.ajax(
            {
                    type: 'POST',
                    url: "auto-load.aspx/GetComment",
                    data: '{ "p_page_number" : ' + v_page_number + ', "p_page_size" : ' + v_page_size + ' }',
                    //contentType: "application/json; charset=utf-8",
                    dataType: "xml",
                    success: OnSuccess,
                    error: OnError
            });

        }


        // 
        function OnSuccess(data)
        {
            ShowXMLData(data);
        }


        // 
        function OnError(p_error)
        {

            if (p_error.status != 200) 
            { 
                $("#loading").html('Error:' + p_error.responseText + '<br /><br /><br /> Status: ' + p_error.status);
                //alert('Error:' + err.responseText + '  Status: ' + err.status); 
            }
        }


        function ShowXMLData(xml)
        {
            debugger;
            try
            {
                var v_comment = $(xml).find('Table');

                for (var i = 0; i < v_comment.length; i++) 
                {
                    var v_time_log_id  = v_comment[i]["time_log_id"];
                    var v_description  = v_comment[i]["description"];
                    var v_hours        = v_comment[i]["hours"];

                    // 
                    var v_comment = $('<div>');
                    var v_h2_description = $('<h2>');
                    var v_span_hours = $('<span>');

                    v_h2_description.html(v_description + ' / Id = ' + v_time_log_id + '</h2>');
                    v_span_hours.html('Number of hours: ' + v_hours + '</span>');


                    v_comment.append(v_h2_description);
                    v_comment.append(v_span_hours);
                    v_comment.append('</div>');

                    $('#feed').append(v_comment);

                });
            }

            catch(err)
            {
                var txt  = "There was an error on this page.\n\n";
                    txt += "Error description: " + err.description + "\n\n";
                    txt += "Click OK to continue.\n\n";

                alert(txt);
            }
        }


    </script>
</head>
<body>
    <form id="frmMain" runat="server">
    <div id="main">
        <h1>AEM - Comments</h1>
        <p>Showing Comments for AEM</p>
        <div id="feed">
        </div>
        <div id="loading">
            Loading Comments...
        </div>
    </div>
    </form>
</body>

C# Code

    using System;
    using System.Data;
    using System.Configuration;
    using System.Collections;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;

    using LibAEM;

    using System.Data.SqlClient;
    using System.Web.Services;

    public partial class auto_load : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }


        [WebMethod]
        public string GetComment(int p_page_number, int p_page_size)
        {


            // ------------------------------------------------------------------------------------------
            // Variable declaration
            // ------------------------------------------------------------------------------------------
            string v_connection_string = LibNamtek.CConnection.GetDBConnection();   // Data Source=192.168.2.40;Initial Catalog=AEM;User ID=aem;Password=aem
            SqlConnection v_connection = new SqlConnection(v_connection_string);


            try
            {
                // ------------------------------------------------------------------------------------------
                // Main program
                // ------------------------------------------------------------------------------------------

                // Open Connection
                v_connection.Open();

                SqlCommand cmd = new SqlCommand("pr_get_paging", v_connection);
                cmd.CommandType = CommandType.StoredProcedure;

                cmd.Parameters.Add("@p_page_number", SqlDbType.Int);
                cmd.Parameters["@p_page_number"].Value = p_page_number;

                cmd.Parameters.Add("@p_page_size", SqlDbType.Int);
                cmd.Parameters["@p_page_size"].Value = p_page_size;

                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet("TimeLog");
                da.Fill(ds);

                string v1 = ds.GetXml();
                return v1;
            }

            catch (Exception ex)
            {
                throw ex;
            }

            finally
            {
                if (v_connection != null)
                {
                    v_connection.Close();
                }
            }
        }


    }

Here's the content of XML result

<?xml version="1.0" standalone="yes"?>
    <TimeLog>
      <Table>
        <time_log_id>1</time_log_id>
        <description>Analysis for C# Project</description>
        <hours>7</hours>
        <minutes>0</minutes>
      </Table>
      <Table>
        <time_log_id>2</time_log_id>
        <description>Create Database Structure</description>
        <hours>4</hours>
        <minutes>10</minutes>
      </Table>
      <Table>
        <time_log_id>4</time_log_id>
        <description>Create SP to get list of Contacts & Employees</description>
        <hours>3</hours>
        <minutes>20</minutes>
      </Table>
      <Table>
        <time_log_id>5</time_log_id>
        <description>Create Web UI with ASP.Net</description>
        <hours>2</hours>
        <minutes>30</minutes>
      </Table>
      <Table>
        <time_log_id>6</time_log_id>
        <description>Test the program</description>
        <hours>1</hours>
        <minutes>15</minutes>
      </Table>
    </TimeLog>

Have you stepped through with the debugger? does v_comment contain anything when you get to the append command?

cv_comment contains the following value: b.fn.b.init[0]

What does it mean ?
Any idea how to parse the xml result from DataSet ?

EDIT:
If i store the result in a xml file physical and i use the same code posted few hours ago, it works fine!

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