How to add multiple charts using Chart.js in ASP.NET (web application)? RRS feed

  • Question

  • Hi all,

    I am creating a front-end application on ASP.NET web application using chart.js charting tool.

    I was able to plot one chart using data I have in SQL server. It look like this:

    This is the code I used to plot the chart above

    protected void Page_Load(object sender, EventArgs e)
                //Connect to the SQL server
                string myConnection = ConfigurationManager.ConnectionStrings["DataBaseConnectionString"].ConnectionString;
                SqlConnection con = new SqlConnection(myConnection);
                String query = "SELECT TOP (1000)[Engine_Hours],[Local_Time_Seconds] FROM [DADLoggerTable].[dbo].[DADLoggerTable]";
                SqlCommand cmd = new SqlCommand(query, con);
                DataTable tb = new DataTable();
                    SqlDataReader dr = cmd.ExecuteReader();
                    tb.Load(dr, LoadOption.OverwriteChanges);
                catch { }
                //Check if there is data in the datatable
                if (tb != null)
                    //Specify chart type
                    String chart = "";
                    chart = "<canvas id=\"line-chart\" width=\"100%\" height=\"40\"></canvas>";
                    chart += "<script>";
                    chart += "new Chart(document.getElementById(\"line-chart\"), { type: 'line', data: {labels: [";
                    //Select the first 460 data points
                    for (int i = 0; i < 460; i++)
                        chart += i.ToString() + ",";
                    chart = chart.Substring(0, chart.Length - 1);
                    chart += "],datasets: [{ data: [";
                    //Select data from the database and add to chart
                    String value = "";
                    for (int i = 0; i < tb.Rows.Count; i++)
                        value += tb.Rows[i]["Engine_Hours"].ToString() + ",";
                    value = value.Substring(0, value.Length - 1);
                    chart += value;
                    chart += "],label: \"Engine Hours\",borderColor: \"#3e95cd\",fill: true}"; // Chart color
                    chart += "]},options: { title: { display: true,text: 'Engine Hours (hr)'} }"; // Chart title
                    chart += "});";
                    chart += "</script>";
                    //Render the chart
                    ltChart.Text = chart;

    I want to be able to place charts on the top of each other and next to each other like those ones below.

    I would much appreciate any idea to get this working.

    Thank you in advance.


    Sami Arja

    • Edited by samiarja Friday, June 12, 2020 7:59 AM text editing
    • Moved by CoolDadTx Friday, June 12, 2020 1:17 PM ASP.NET related
    Friday, June 12, 2020 7:56 AM

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    Friday, June 12, 2020 11:08 AM