Chart js: Update line chart having two data sets

Question

I want to update a line chart in chart js with two data sets. I've somehow managed to empty the chart and then able to fill in one of the data set. but unable to make both data sets working. here's the code.

ajaxRequest(
    {
        url: 'reports/updateChart/?filter=true',
        method: 'post',
        data: data
    }, function (response)
        {
            /*refresh the tables with the new data sets*/
            removeData(myChart);
            let label = [1, 234, 234, 234, 234, 234, 234, 34, 234, 23, 23, 41, 3, 2, 4];
            let data = [234, 234, 5, 23, 34, 234, 234, 234],[22, 1, 123, 14, 2]
        }; addData(myChart, label, data);
    });

});

functions:

function removeData(chart) {
    chart.data.labels = [];
    chart.data.datasets.forEach((dataset) => {
        dataset.data = [];
    });
    chart.update();
}

function addData(chart, label, data) {
    $.each(label, function (index, value) {
        chart.data.labels.push(value);
    });

    chart.data.datasets.forEach((dataset) => {
        $.each(data, function (index, value) {
            dataset.data.push(value);
        });
    });
    chart.update();
}

Is data really two data sets? And does the single dataset that you successfully plot include all the data from both datasets? — Mawg says reinstate Monica
8 plotted points from the first array. when i add second array like that it gives me an error — Rey Young
That's teh first time you have mentioned an error :-) Care to tell us what it says? That might help — Mawg says reinstate Monica

Kunal Khivensara Kunal Khivensara · Accepted Answer · 2018-10-26T03:44:06

I am not able to find out the issue with your code, but you can refer the below way of updating charts which is very similar to what you have tried but this is working. You can refer the fiddle also -> http://jsfiddle.net/cuzx3L7j/4/

Hope it helps!

function clearAndAddNewDataSets() {
  myChart.config.data.datasets = [];
  myChart.config.data.labels = [];

  var labels = ['Label1', 'Label2', 'Label3', 'Label4', 'Label5', 'Label6', 'Label8', 'Label8'];
  var data = [
    [234, 234, 5, 23, 34, 234, 234, 234],
    [22, 1, 123, 14, 2]
  ]

  var colors = ['Red', 'Green'];

  myChart.config.data.labels = labels;

  for (i = 0; i < data.length; i++) {
    var dataSet = {
      label: 'testLabel' + i,
      data: data[i],
      backgroundColor: colors[i]
    }

    myChart.config.data.datasets.push(dataSet);
  }

  myChart.update();

}

Chart js: Update line chart having two data sets

1 Answers