Background Coloring Indicator Not Working

[redart1021]

Hi would anyone know why this indicator works on some charts but fails to load on others?
Thanks

protected override void OnBarUpdate()
{
BackBrush = Brushes.PaleGreen;
BackBrush = null;

if (EMA(30)[0] >= Close[0] && EMA(30)[0] >= Close[1] && EMA(30)[0] >= Close[2])
{
BackBrush = Brushes.LightPink;
}
else if (EMA(30)[0] <= Close[0] && EMA(30)[0] <= Close[1] && EMA(30)[0] <= Close[2])
{
BackBrush = Brushes.DarkSeaGreen;
}
else
{
BackBrush = Brushes.PapayaWhip;
}
}

[NinjaTrader_PaulH]

Hello redart1021,

Thanks for your post and welcome to the NinjaTrader forums!

When an indicator is not working as expected, please check the "log" tab of the NinjaTrader control center.

Based on the code you have shared I suspect that you would see an error messages about bar indexing.

What happens when you load a script is that it will start processing the very first bar in the data series that is applied to the chart. If on the first bar of data processed the script tries to access a prior bar (I see [1] and [2] in your code) then it will fail because those bars are not available at that time.

The reason it is inconsistent ( works on some charts but fails to load on others) is related to the conditions you have. If part of the condition is not true the rest is not evaluated so in that case you can get lucky and see the indicator. I would expect that the indicator could fail on any given chart on any given day when it is loaded.

What you need to do is to prevent your code from processing until, from what I see, at least 2 bars have been loaded. In OnBarUpdate() before your code accesses any previous bars, add this line of code:

if (CurrentBar < 2) return; // do not process below this line until at least 2 bars

You could also use 20 bars as a number because no indicator will print before 20 bars have been loaded.

Reference: https://ninjatrader.com/support/help...currentbar.htm

[redart1021]

Thanks Paul. This worked great