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@Carmen,
Based on your requirement it seems you are trying to render a chart corresponding to the options selected from a dropdown list. If so, please check this JSFiddle example.
You can update the chart options / data based on the options selected from dropdown list as shown below –
$( ".dropdown" ).change(function() { chart.options.data[0].dataPoints = []; var e = document.getElementById("dd"); var selected = e.options[e.selectedIndex].value; dps = jsonData[selected]; for(var i in dps) { var xVal = dps[i].x; chart.options.data[0].dataPoints.push({x: new Date(xVal), y: dps[i].y}); } chart.render(); });
___________ Indranil Deo Team CanvasJS