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@ben551445,
You can use the rangeChanged event handler to sync the range of both the stockcharts when there is a change in the inputFields, rangeButtons or navigator. Please refer to the code snippet below:
function syncHandler(e) { for(i = 0; i < stockCharts.length; i++) { var stockChart = stockCharts[i]; if(stockChart != e.stockChart) { stockChart.options.navigator.slider.minimum = e.minimum; stockChart.options.navigator.slider.maximum = e.maximum; stockChart.render(); } } }
Please take a look at this JSFiddle for working code.
— Thangaraj Raman Team CanvasJS