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CanvasJS click event is fired only when you click on datapoint (marker) & not when you click on line as of now. However, with a few lines of code you can achieve to detect if the click has happened on the line. To do so, you can bind click event to the chart canvas & with the help of point on the line formula, you can determine whether the click happened on the line connecting two datapoints.

Please take a look at this JSFiddle for a working example.

Click event handler for dataseries line

Sachin Bisht
Team CanvasJS