# Changes to the chart or parameters

If there is a change to the chart, such as a switch of timeframe, or a change by the user to your user-defined settings, then the chart will always make your UDI recalculate all its data by issuing a call to UDI.onCalculate().

However, if you need to take special, extra action when these values/settings change, then you can implement the optional functions UDI.onContextChange() and UDI.onParameterChange()


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