Access to High, Low, Open, Close, Time series out of OnBarUpdate

[tidicofx]

Hello
I am trying to access OHLC, Time data series out of OnBarUpdate , but it seems these data are invalid as most of time I get index out of range exception
so as general rule is there anyway to access these data on other modules like OnRender or OnMouseDown when user click on any bar on chart? how I should loop into these data series when user click on specific bar, for example when user click on a bar, I want to check if this bar is lower than previous day low, how I can loop into High/Low data series out of OnBarUpdate (in this case in OnMouseDown handler)

[tidicofx]

to make it more clear I attach a sample code I have written, I have tried to read indicator value for 46 Bars ago once in OnBarUpdate and once in OnRender
value read in OnBarUpdate is written on top right, and exception I have gotten when trying to read in OnRender function is printed on top left

        protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
        {
            if (!dataIsReady) return;
            try
            {
                if (CurrentBar>46)
                {
                    double obv=Mavis()[46];
                    Draw.TextFixed(this, "Test", obv.ToString(), TextPosition.TopLeft);
                }
            }
            catch (Exception ex)
            {
                Draw.TextFixed(this, "Test", CurrentBar.ToString()+", "+ex.Message, TextPosition.TopLeft);
            }
        }
        
        protected override void OnBarUpdate()
        {
            try
            {
                if (CurrentBar>46)
                {
                    value=Mavis()[46];
                    Draw.TextFixed(this, "Test2", value.ToString(), TextPosition.TopRight);
                }
            }
            catch (Exception ex)
            {
            }
        }
​

flag dataIsReady is set to true on OnStateChange when State=DataLoaded
else if (State == State.DataLoaded)
{
dataIsReady=true;
}

[NinjaTrader_Jesse]

Hello tidicofx,

I would not suggest trying to use drawing objects from OnRender, the code you have shown would be best suited for OnBarUpdate. OnRender is used for custom rendering where you write your own rendering code. You can see an example of that here: https://ninjatrader.com/support/help...htsub=onrender

OnRender is not a NinjaScript bar processing method so you would need to know the specific indexes of the bars to get values from OnRender. You can use a series GetValueAt method to get prices based on an index. I would suggest looking at the sample in the following page. When using OnRender you should only try to access bar data for currently visible bars to avoid delaying OnRender, that makes it more efficient.

https://ninjatrader.com/support/helpGuides/nt8/chartbars_toindex.htm?zoom_highlightsub=toindex

[tidicofx]

Hello tidicofx,

I would not suggest trying to use drawing objects from OnRender, the code you have shown would be best suited for OnBarUpdate. OnRender is used for custom rendering where you write your own rendering code. You can see an example of that here: https://ninjatrader.com/support/help...htsub=onrender

OnRender is not a NinjaScript bar processing method so you would need to know the specific indexes of the bars to get values from OnRender. You can use a series GetValueAt method to get prices based on an index. I would suggest looking at the sample in the following page. When using OnRender you should only try to access bar data for currently visible bars to avoid delaying OnRender, that makes it more efficient.

https://ninjatrader.com/support/helpGuides/nt8/chartbars_toindex.htm?zoom_highlightsub=toindex

hello, than you for replying
I sent that code just as sample, so I need to know if Data series are accessible out of OnBarUpdate or not
here is practical reason why I need them out of OnBarUpdate
suppose I want to write a tool that is going to trigger an action when user press a specific key
this action is to scan last 4days and check for specific conditions based on indicator values/and market data
this is not something that I can do in OnBarUpdate or maybe I dont know how it is possible, because trigger comes from OnKeyDown module for example
the sample code I have written above was to just show that data access is different when I try samething in OnBarUpdate and out of it

[NinjaTrader_Jesse]

Hello tidicofx,

The link I provided shows how to access a data series outside of OnbarUpdate in areas like OnRender. You need the specific index of the bar to access its value.

Using OnRender is not a good use case for a DrawingTool. The code you provided would be suited to be used in OnBarUpdate because DrawingTools expect to be used from OnBarUpdate with a BarsAgo. TextFixed does not use a BarsAgo but can still be used from OnBarUpdate to make sure it does not use more resources than necessary because OnRender is called very frequently.

If you are writing code that happens based on a key press your code should be inside the key event handler and not OnRender. When using key events you also need to use TriggerCustomEvent and surround the code in the handler so you can access series values using a BarsAgo. TriggerCustomEvent should not be used from OnRender that will cause lagging.

https://ninjatrader.com/support/helpGuides/nt8/triggercustomevent.htm

TriggerCustomEvent(o =>
{
   //your code here
}, null);

[tidicofx]

Hello tidicofx,

The link I provided shows how to access a data series outside of OnbarUpdate in areas like OnRender. You need the specific index of the bar to access its value.

Using OnRender is not a good use case for a DrawingTool. The code you provided would be suited to be used in OnBarUpdate because DrawingTools expect to be used from OnBarUpdate with a BarsAgo. TextFixed does not use a BarsAgo but can still be used from OnBarUpdate to make sure it does not use more resources than necessary because OnRender is called very frequently.

If you are writing code that happens based on a key press your code should be inside the key event handler and not OnRender. When using key events you also need to use TriggerCustomEvent and surround the code in the handler so you can access series values using a BarsAgo. TriggerCustomEvent should not be used from OnRender that will cause lagging.

https://ninjatrader.com/support/helpGuides/nt8/triggercustomevent.htm

TriggerCustomEvent(o =>
{
//your code here
}, null);

yes using TriggerCustomEvent makes it work without problem
thank you for your reply