use jquery-datatable data source for generating google visualization chart

Question

I am not very conversant with javascript.I have a jquery datatable loaded using an ajax call as follows:

$('#table').dataTable( {
    "processing": true,
    "serverSide": true,
    "ajax": "http://api.mywebsite.com/report",
            "columns": [
        { "data": "date" },
        { "data": "ordernumber" },
        { "data": "totalsales" },
        { "data": "subtotal" }
           ]
} );

I want to load the dataTable together with a Google chart but I have no clue how to get the data object from above dataTable initialization to the the Google code below and trigger the same routine every time the datable is re-populated:

google.setOnLoadCallback(drawChart);
  function drawChart() {
    var data = google.visualization.arrayToDataTable([
      ['Date', 'Sales'],
      ['20 Jan - Feb 04',  10340 ],
      ['20 Feb - Mar 05',  23470 ],
      ['20 June - Dec 06',  450 ],
      ['20 Mar - Aug 07',  3030 ]
    ]);

    var options = {
      title: 'Company Performance'
    };

    var chart = new google.visualization.LineChart(document.getElementById('chart_div'));

    chart.draw(data, options);
  }

Is there a way I can replace below

     `['Date', 'Sales'],
      ['20 Jan - Feb 04',  10340 ],
      ['20 Feb - Mar 05',  23470 ],
      ['20 June - Dec 06',  450 ],
      ['20 Mar - Aug 07',  3030 ]`

with something like:

dataTable.data[date]

Answer 1

This is quite easy. I notice you are using dataTables 1.10.x, and then you can use the API to iterate over each row, and build up a data array google visualization will use :

$("#buildChart").click(function() {
    var dataArray = [];
    dataArray.push([ 'date', 'totalsales' ]);
    table.rows().data().each(function(value, index) {
        dataArray.push([ value.date, value.totalsales ]);
    });
    drawChart(dataArray);
});

and the called drawChart function is pretty much like the one in your question :

function drawChart(dataArray) {
    var data = google.visualization.arrayToDataTable(dataArray);
    var options = {
      title: 'dataTables to google visualization'
    };
    var chart = new google.visualization.LineChart(document.getElementById('chart'));
    chart.draw(data, options);
}

---

see demo using your data -> http://jsfiddle.net/9wvvh8sk/