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@unixssh,
Datapoint accepts x-value and y-value with optional label and z-value. In your case, on click of update button, you seem to be passing ‘w’ instead of ‘y’. Changing chart.options.data[0].dataPoints[i] = {x:date1, w:w}; to chart.options.data[0].dataPoints[i] = {x:date1, y:w}; should work fine in your case.
chart.options.data[0].dataPoints[i] = {x:date1, w:w};
chart.options.data[0].dataPoints[i] = {x:date1, y:w};
If this doesn’t solve your requirement, kindly create jsfiddle reproducing the issue, so that we can look into it and help you out.
— Vishwas R Team CanvasJS