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@malvika,
You can reset the axis range programmatically by setting viewportMinimum & viewportMaximum to null. Please refer to the code-snippet below which shows how to reset the axis range on button click.
document.getElementById("resetChart").addEventListener("click", function() { chart.axisX[0].set("viewportMinimum", null, false); chart.axisX[0].set("viewportMaximum", null); });
Please take a look at this JSFiddle for complete code.
— Vishwas R Team CanvasJS