Google Line Chart - Dynamic add columns / rows from arraydatatable

Question

I want to plot the line chart, generate two lines into one chart, in order show the total for each Line on each day.

When i run the program, the error message "Row 1 has 1 columns, but must have 27".
in fact the code behind I have retrieved data from SQL and there is 26 rows in the table, and the script confused me there is 27 rows.

I tried to add columns one by one, but still the same error.

and I am thinking how can i add dynamic columns and rows instead of add columns manually?

Here is my script:

function drawMultiLineChart() {
            var options = {
                title: 'Multi Line Chart',
                width: 1000,
                height: 500,                                         
            };

       $.ajax({
            type: "POST",
            url: "Chart.aspx/GetMultiLineData",
            data: '{}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (r) {
                var data = google.visualization.arrayToDataTable(r.d);                                        
                data.addColumn('string', 'Line');
                data.addColumn('string', 'F1');
                data.addColumn('string', 'T1');
                data.addColumn('string', 'T10');
                data.addColumn('string', 'T11');
                data.addColumn('string', 'T12');
                data.addColumn('string', 'T13');
                data.addColumn('string', 'T14');
                data.addColumn('string', 'T15');
                data.addColumn('string', 'T16');
                data.addColumn('string', 'T19');
                data.addColumn('string', 'T2');
                data.addColumn('string', 'T21');
                data.addColumn('string', 'T22');
                data.addColumn('string', 'T23');
                data.addColumn('string', 'T24');
                data.addColumn('string', 'T25');
                data.addColumn('string', 'T26');
                data.addColumn('string', 'T27');
                data.addColumn('string', 'T28');
                data.addColumn('string', 'T3');
                data.addColumn('string', 'T4');
                data.addColumn('string', 'T5');
                data.addColumn('string', 'T6');
                data.addColumn('string', 'T7');
                data.addColumn('string', 'T8');
                data.addColumn('string', 'T9');                                        
                var chart = new google.visualization.LineChart($("#divMultiLineChart")[0]);
                chart.draw(data, options);
            },
            failure: function (r) {
                alert(r.d);
            },
            error: function (r) {
                alert(r.d);
            }
        });
    }

will you please share a sample of the data? --> console.log(JSON.stringify(r.d)); — WhiteHat
– WhiteHat, Commented Oct 20, 2020 at 11:22
Hi WhiteHat, thank you for your reply, here is my data, total 590 rows, and sort by date, — Andy Man
– Andy Man, Commented Oct 20, 2020 at 12:44
Hi WhiteHat, thank you, here is the link of the file: dropbox.com/s/lz49pxzclc66ezz/localhost-1603199334530.log?dl=0 — Andy Man
– Andy Man, Commented Oct 20, 2020 at 13:24
and i cannot paste the file directly due to the characters limited., thanks. — Andy Man
– Andy Man, Commented Oct 20, 2020 at 13:26
thank you. when using arrayToDataTable, it will create the columns for you, no need to use addColumn afterwards. however, I noticed in your data sample, the rows don't appear correct...? --> ["System.Collections.Generic.List'1[System.String]"], — WhiteHat
– WhiteHat, Commented Oct 20, 2020 at 14:01

WhiteHat · Accepted Answer · 2020-10-20 15:31:15Z

in order to draw multiple lines on a chart.
each series / line must be in a separate column in the data table.

the format of the rows and columns would need to be formatted as follows...

[
  ["SelectedDate","F1","T1","T2","T3", ...]
  ["08/01/2020",8,10,12,14, ...]
  ...
]

if this format is difficult to produce in SQL,
we can manipulate the data on the client, before drawing the chart.

the current format of the data is as follows...

[
  ["SelectedDate","Line","TotalCavities"],
  ["08/01/2020","F1",8],
  ["08/01/2020","T1",21],
  ...
]

we can use methods provided by google to transform the data into the proper format.

first, we create the data table. group on the second column, then create a data view,
with a column for each line.

see following working snippet...

google.charts.load("current", {
  packages: ["corechart"]
}).then(function () {
  var options = {
    title: "Multi Line Chart",
    width: 1800,
    height: 700,
    legend: { position: "bottom" }
  };

  $.ajax({
    type: "POST",
    url: "Chart.aspx/GetMultiLineData",
    data: "{}",
    contentType: "application/json; charset=utf-8",
    dataType: "json"
  }).done(drawMultiLineChart).fail(function () {
    drawMultiLineChart({d: [["SelectedDate","Line","TotalCavities"],["08/01/2020","F1",8],["08/01/2020","T1",21],["08/01/2020","T10",0],["08/01/2020","T11",24],["08/01/2020","T12",24],["08/01/2020","T13",24],["08/01/2020","T16",24],["08/01/2020","T19",20],["08/01/2020","T21",21],["08/01/2020","T22",29],["08/01/2020","T23",32],["08/01/2020","T26",16],["08/01/2020","T27",16],["08/01/2020","T4",0],["08/01/2020","T5",30],["08/01/2020","T6",15],["08/01/2020","T7",26],["08/01/2020","T8",24],["08/01/2020","T9",32],["08/02/2020","T1",15],["08/02/2020","T10",0],["08/02/2020","T11",23],["08/02/2020","T12",32],["08/02/2020","T13",14],["08/02/2020","T16",24],["08/02/2020","T19",30],["08/02/2020","T21",21],["08/02/2020","T22",19],["08/02/2020","T23",32],["08/02/2020","T26",16],["08/02/2020","T3",0],["08/02/2020","T4",0],["08/02/2020","T5",20],["08/02/2020","T6",15],["08/02/2020","T7",8],["08/02/2020","T8",32],["08/02/2020","T9",24],["08/03/2020","T1",18],["08/03/2020","T10",8],["08/03/2020","T11",23],["08/03/2020","T12",24],["08/03/2020","T13",24],["08/03/2020","T16",24],["08/03/2020","T19",18],["08/03/2020","T21",21],["08/03/2020","T22",21],["08/03/2020","T23",32],["08/03/2020","T27",24],["08/03/2020","T4",0],["08/03/2020","T5",18],["08/03/2020","T6",17],["08/03/2020","T7",20],["08/03/2020","T8",23],["08/03/2020","T9",24],["08/04/2020","F1",24],["08/04/2020","T1",24],["08/04/2020","T10",0],["08/04/2020","T11",24],["08/04/2020","T12",32],["08/04/2020","T13",16],["08/04/2020","T16",8],["08/04/2020","T19",18],["08/04/2020","T21",21],["08/04/2020","T22",30],["08/04/2020","T23",32],["08/04/2020","T5",30],["08/04/2020","T6",17],["08/04/2020","T7",24],["08/04/2020","T8",23],["08/04/2020","T9",24],["08/05/2020","F1",24],["08/05/2020","T1",11],["08/05/2020","T11",31],["08/05/2020","T12",24],["08/05/2020","T13",30],["08/05/2020","T19",18],["08/05/2020","T21",29],["08/05/2020","T23",32],["08/05/2020","T4",24],["08/05/2020","T5",18],["08/05/2020","T6",18],["08/05/2020","T7",24],["08/05/2020","T8",24],["08/05/2020","T9",32],["08/06/2020","F1",32],["08/06/2020","T1",25],["08/06/2020","T11",23],["08/06/2020","T12",40],["08/06/2020","T13",28],["08/06/2020","T16",22],["08/06/2020","T19",26],["08/06/2020","T2",8],["08/06/2020","T21",28],["08/06/2020","T22",6],["08/06/2020","T23",36],["08/06/2020","T25",8],["08/06/2020","T27",32],["08/06/2020","T4",16],["08/06/2020","T5",26],["08/06/2020","T6",18],["08/06/2020","T8",24],["08/06/2020","T9",23],["08/07/2020","F1",32],["08/07/2020","T1",17],["08/07/2020","T11",21],["08/07/2020","T12",24],["08/07/2020","T13",18],["08/07/2020","T19",26],["08/07/2020","T21",21],["08/07/2020","T23",22],["08/07/2020","T25",32],["08/07/2020","T27",24],["08/07/2020","T3",14],["08/07/2020","T4",16],["08/07/2020","T5",34],["08/07/2020","T6",21],["08/07/2020","T7",20],["08/07/2020","T8",32],["08/07/2020","T9",29],["08/08/2020","F1",24],["08/08/2020","T1",24],["08/08/2020","T10",0],["08/08/2020","T11",21],["08/08/2020","T12",32],["08/08/2020","T13",26],["08/08/2020","T19",18],["08/08/2020","T21",21],["08/08/2020","T22",14],["08/08/2020","T23",21],["08/08/2020","T25",22],["08/08/2020","T27",24],["08/08/2020","T3",12],["08/08/2020","T4",0],["08/08/2020","T5",26],["08/08/2020","T6",15],["08/08/2020","T7",8],["08/08/2020","T8",22],["08/08/2020","T9",13],["08/09/2020","F1",24],["08/09/2020","T1",23],["08/09/2020","T11",24],["08/09/2020","T12",16],["08/09/2020","T13",28],["08/09/2020","T14",8],["08/09/2020","T19",18],["08/09/2020","T21",36],["08/09/2020","T22",20],["08/09/2020","T23",21],["08/09/2020","T25",21],["08/09/2020","T27",24],["08/09/2020","T3",0],["08/09/2020","T4",21],["08/09/2020","T5",18],["08/09/2020","T6",15],["08/09/2020","T7",0],["08/09/2020","T8",18],["08/09/2020","T9",10],["08/10/2020","F1",24],["08/10/2020","T1",17],["08/10/2020","T11",12],["08/10/2020","T12",32],["08/10/2020","T13",17],["08/10/2020","T14",8],["08/10/2020","T19",17],["08/10/2020","T2",23],["08/10/2020","T21",19],["08/10/2020","T22",18],["08/10/2020","T23",32],["08/10/2020","T25",24],["08/10/2020","T26",24],["08/10/2020","T27",24],["08/10/2020","T3",0],["08/10/2020","T4",15],["08/10/2020","T5",18],["08/10/2020","T6",15],["08/10/2020","T7",12],["08/10/2020","T8",14],["08/10/2020","T9",24],["08/11/2020","F1",29],["08/11/2020","T1",18],["08/11/2020","T11",0],["08/11/2020","T12",16],["08/11/2020","T13",23],["08/11/2020","T14",24],["08/11/2020","T19",20],["08/11/2020","T2",24],["08/11/2020","T21",28],["08/11/2020","T22",18],["08/11/2020","T23",40],["08/11/2020","T25",8],["08/11/2020","T26",21],["08/11/2020","T27",24],["08/11/2020","T3",0],["08/11/2020","T4",7],["08/11/2020","T5",20],["08/11/2020","T6",19],["08/11/2020","T7",29],["08/11/2020","T8",16],["08/11/2020","T9",24],["08/12/2020","F1",7],["08/12/2020","T1",18],["08/12/2020","T10",6],["08/12/2020","T11",8],["08/12/2020","T12",21],["08/12/2020","T13",21],["08/12/2020","T14",24],["08/12/2020","T15",14],["08/12/2020","T16",16],["08/12/2020","T19",24],["08/12/2020","T2",24],["08/12/2020","T21",21],["08/12/2020","T22",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  });

  function drawMultiLineChart(r) {
    // data table
    var data = google.visualization.arrayToDataTable(r.d);

    // data view
    var view = new google.visualization.DataView(data);

    // init column arrays
    var aggColumns = [];
    var viewColumns = [0];

    // build view & agg columns for each line
    data.getDistinctValues(1).forEach(function (line, index) {
      // add view column for each line
      viewColumns.push({
        calc: function (dt, row) {
          if (dt.getValue(row, 1) === line) {
            return dt.getValue(row, 2);
          }
          return null;
        },
        label: line,
        type: "number"
      });

      // add agg column
      aggColumns.push({
        aggregation: google.visualization.data.sum,
        column: index + 1,
        label: line,
        type: "number"
      });
    });

    // set view columns
    view.setColumns(viewColumns);

    // agg view by line
    var aggData = google.visualization.data.group(
      view,
      [0],
      aggColumns
    );

    // draw chart
    var chart = new google.visualization.LineChart($("#divMultiLineChart").get(0));
    chart.draw(aggData, options);
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="divMultiLineChart"></div>

hope this helps, in this example, the fail callback is used to pass the hard-coded data, and is only needed for example purposes here...
This really help, thanks. For the production environment, data will change daily, so is it means before user generate chart, i need to hard-coded the data, to transfer into proper format first if datatable is not in this format?
no, don't think so, if the data comes from the SQL query in the format hard-coded above, the JavaScript will transform to proper format dynamically. the data was hard-coded above, just so it would work on this site. since it can't reach "Chart.aspx/GetMultiLineData" from here. you can delete the fail callback above and it still work in your environment
I see, will check the log and query output format again, thanks.

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Google Line Chart - Dynamic add columns / rows from arraydatatable

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