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Jelch,
Here y values are string. So, by parsing newly assigned y values to number will render the updated chart. Change the click handler function as below-
$("#AddDate").click(function () { dataPointsK.push({ x:TrainingNr ,y: Number(document.getElementById("deadlift").value)}); dataPointsB.push({ x: TrainingNr,y: Number(document.getElementById("benchpress").value)}); TrainingNr = TrainingNr +1 chart.render(); });