How to select data from database MS SQL from using canvas jscript?

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//Default.aspx

<div class="card-body">
                                       <div class="chart-area">
                                           <canvas id="myAreaChart"></canvas>
                                       </div>
                                   </div>

//chart-area.js

var ctx = document.getElementById("myAreaChart");
var myLineChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
    datasets: [{
      label: "Earnings",
      lineTension: 0.3,
      backgroundColor: "rgba(78, 115, 223, 0.05)",
      borderColor: "rgba(78, 115, 223, 1)",
      pointRadius: 3,
      pointBackgroundColor: "rgba(78, 115, 223, 1)",
      pointBorderColor: "rgba(78, 115, 223, 1)",
      pointHoverRadius: 3,
      pointHoverBackgroundColor: "rgba(78, 115, 223, 1)",
      pointHoverBorderColor: "rgba(78, 115, 223, 1)",
      pointHitRadius: 10,
      pointBorderWidth: 2,
      data: [0, 10000],
    }],
  },
  options: {
    maintainAspectRatio: false,
    layout: {
      padding: {
        left: 10,
        right: 25,
        top: 25,
        bottom: 0
      }
    },
    scales: {
      xAxes: [{
        time: {
          unit: 'date'
        },
        gridLines: {
          display: false,
          drawBorder: false
        },
        ticks: {
          maxTicksLimit: 7
        }
      }],
      yAxes: [{
        ticks: {
          maxTicksLimit: 5,
          padding: 10,
          // Include a dollar sign in the ticks
          callback: function(value, index, values) {
            return '$' + number_format(value);
          }
        },
        gridLines: {
          color: "rgb(234, 236, 244)",
          zeroLineColor: "rgb(234, 236, 244)",
          drawBorder: false,
          borderDash: [2],
          zeroLineBorderDash: [2]
        }
      }],
    },
    legend: {
      display: false
    },
    tooltips: {
      backgroundColor: "rgb(255,255,255)",
      bodyFontColor: "#858796",
      titleMarginBottom: 10,
      titleFontColor: '#6e707e',
      titleFontSize: 14,
      borderColor: '#dddfeb',
      borderWidth: 1,
      xPadding: 15,
      yPadding: 15,
      displayColors: false,
      intersect: false,
      mode: 'index',
      caretPadding: 10,
      callbacks: {
        label: function(tooltipItem, chart) {
          var datasetLabel = chart.datasets[tooltipItem.datasetIndex].label || '';
          return datasetLabel + ': $' + number_format(tooltipItem.yLabel);
        }
      }
    }
  }

What I have tried:

I don't want to use data given in chart-area.js. It should give output from database MS SQL. I have tried to insert in default.aspx.cs like below but it gives data from chart-area.js.

//Default.aspx.cs

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

       }

       [WebMethod]
       public static string GetAllRecords()
       {
           DataTable dt = new DataTable();
           using (SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["db"].ConnectionString))
           {
               using (SqlCommand cmd = new SqlCommand("SELECT MONTH(OrderDate), COUNT(Products) AS Products FROM tblOrderProducts GROUP BY OrderDate", con))
               {
                   con.Open();
                   SqlDataAdapter da = new SqlDataAdapter(cmd);
                   da.Fill(dt);
                   JavaScriptSerializer serializer = new JavaScriptSerializer();
                   List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
                   Dictionary<string, object> row;
                   foreach (DataRow dr in dt.Rows)
                   {
                       row = new Dictionary<string, object>();
                       foreach (DataColumn col in dt.Columns)
                       {
                           row.Add(col.ColumnName, dr[col]);
                       }
                       rows.Add(row);
                   }

                   return serializer.Serialize(rows);
               }
           }
       }
   }

Posted 4-Apr-21 7:25am

Member 15100384

Updated 4-Apr-21 23:43pm

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Arfat M · Answer 1 · 2021-04-04T23:43:00

C#

public List<Records>GetAllRecords()
 {
   List<Records> ListRecords = new List<Records>();

// Fetch data from db through the query


 // Use this for loop to construct List instead of your foreach loop

    for (int i = 0; i < dt.Rows.Count; i++)
            {                               
                Records oRec = new Records();
                oRec.Month = !string.IsNullOrEmpty(Convert.ToString(dt.Rows[i]["Month"])) ? Convert.ToString(dt.Rows[i]["Month"]) : "";              
                oRec.Count= !string.IsNullOrEmpty(Convert.ToString(dt.Rows[i]["Count"])) ? Convert.ToInt32(dt.Rows[i]["Count"]) : 0;

                ListRecords.Add(oRec);
            }
           
            return ListRecords;
               }
           }
       }

    public class Records
    {
      
        public string Month { get; set; }     
        public int Count { get; set; }
       
    }

add below script and html code in your default.aspx

<div id="curve_chart"></div>

JavaScript

<script type="text/javascript">
    google.charts.load('current', { 'packages': ['corechart'] });
</script>

<script type="text/javascript">

        
      var chartData = [];       
        GetAllRecords();   

        function GetAllRecords() {
            chartData = [];
       
            $.ajax({
                url: 'GetAllRecords',   //  path to your function
                contentType: "application/json; charset=utf-8",
                async: false,
                cache: false,
                data: obj,
                success: function (data) {
                   var resultData = data.ListRecords;               
               

                    var length = resultData.length;
                    $.each(resultData, function (index, value) {                      
                       chartData.push([value.Month, value.Count]);
                        if (index === (length - 1)) {
                            google.charts.setOnLoadCallback(drawChart);
                        }
                    });                     
                }
            });
        }

        function drawChart() {
           
            var data = new google.visualization.DataTable();             
            data.addColumn('string', 'Month');
            data.addColumn('number', 'Count');            
              
            data.addRows(chartData);

            var options = {             
                title: 'Monthwise Products count',
                pointsVisible: true,              
                legend: {position: 'none'},
                titleTextStyle: {
                    color: '#01579b',
                    fontSize: 30,
                    fontName: 'Arial',
                    bold: true,
                    italic: true
                },

                hAxis: {
                                
                    showTextEvery: 1,
                    slantedText: true,
                    slantedTextAngle: 60,
                    gridlines: { count: chartData.length }
                },
                vAxis: {
                    title: "",                    
                    minValue: 0,
                   // format: '',

                }
            };
         
            var chart = new google.visualization.AreaChart(document.getElementById('curve_chart'));
            chart.draw(data, options);
            
        }

</script>