Currently I use this to add data to my charts:

 targetChart.addData(value,targetDataSetIndex,);

because I thought that this would add data to a specific set, adding an empty label.

But this doesnt work.

I then tried doing it myself by introducing a new method in the Chart.js script, like this:

    addDataValueToSpecificDataSet :function(value,datasetIndex)

    {

        this.datasets[datasetIndex].points.push(new this.PointClass({

            value: value,

            label: label,

            x: this.scale.calculateX(this.scale.valuesCount + 1),

            y: this.scale.endPoint,

            strokeColor: this.datasets[datasetIndex].pointStrokeColor,

            fillColor: this.datasets[datasetIndex].pointColor

        }));

    }

But when executing it isnt found. Where in Chart.JS do I need to put this so that it is accessible from the outside? Or can someone please tell me how im supposed to add data to a chart with multiple datasets one by one. I cant find it in the documentation which covers everything BUT adding and removing data.