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@mihaela,
You can zoom the chart using mousewheel by attaching wheel event to the chart. Please find the code snippet below.
document.getElementsByClassName("canvasjs-chart-canvas")[1].addEventListener("wheel", function(e){ e.preventDefault(); if(e.clientX < chart.plotArea.x1 || e.clientX > chart.plotArea.x2 || e.clientY < chart.plotArea.y1 || e.clientY > chart.plotArea.y2) return; var axisX = chart.axisX[0]; var viewportMin = axisX.get("viewportMinimum"), viewportMax = axisX.get("viewportMaximum"), interval = axisX.get("minimum"); var newViewportMin, newViewportMax; if (e.deltaY < 0) { newViewportMin = viewportMin + interval; newViewportMax = viewportMax - interval; } else if (e.deltaY > 0) { newViewportMin = viewportMin - interval; newViewportMax = viewportMax + interval; } if(newViewportMin >= chart.axisX[0].get("minimum") && newViewportMax <= chart.axisX[0].get("maximum") && (newViewportMax - newViewportMin) > (2 * interval)){ chart.axisX[0].set("viewportMinimum", newViewportMin, false); chart.axisX[0].set("viewportMaximum", newViewportMax); } });
Please take a look at this JSFiddle for complete code.
— Vishwas R Team CanvasJS