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@elitriona,
It seems like you are not rendering the chart after updating the datapoints on ajax request. Calling chart.render() after updating the datapoints will work fine in your case. Please take a look the code snippet below for the same.
chart.render()
$.getJSON('https://trionacgm.fly.dev/api/v1/entries.json?count=12', function(data) { chart.options.data[0].dataPoints = []; $.each(data, function(key, value) { chart.options.data[0].dataPoints.push({ x: (value['date']), y: Number(value['sgv']) }); }); chart.render(); });
Also, check out this JSFiddle for complete working code.
—- Manoj Mohan Team CanvasJS