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rangeChanging and rangeChanged are triggered everytime when viewportMinimum or viewPortMaximum are updated while zooming, panning, or reset. If you like to perform some task within rangeChanging/rangeChanged for custom range, you can add a condition to check the range before the actual functionality.

rangeChanging: function(e) {
    if(e.axisX[0].viewportMinimum > customRangeMinimum && e.axisX[0].viewportMaximum < customRangeMaximum) {
        //Your code goes here

Vishwas R
Team CanvasJS