rangeChanged event handler for stockchart are called whenever any individual chart’s range is changed by zooming/panning as well as on changing range using navigator and slider. rangeChanged event handler of individual charts are called on zooming/panning the particular chart. Also, rangeChanged event of individual charts will be called first and then of stockchart when there is a change in the range of individual charts.
You can check out this JSFiddle to check how rangeChanged event handler is called for individual charts and stockcharts.
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Manoj Mohan
Team CanvasJS