Ensuring that only a single instance of an indicator is loaded on chart

[Shai Samuel]

Hi,

Is there a way to ensure, that only a single instance of an indicator is loaded on chart?

[NinjaTrader_MichaelM]

Hello Shai Samuel,

Thank you for writing in. While there is no way to prevent a user from attempting to add multiples of the same indicator, you can add a check in your indicator so that it simply returns if it has been added more than once.
For example:

#region Variables
    private bool alreadyExists = false;
#endregion
protected override void Initialize()
{
    foreach(Indicator i in ChartControl.Indicators)
    {
        if(i.Name == "myIndicator") //Replace with the name of your indicator
        {
            alreadyExists = true;
            return;
        } else {
            //Initialize the indicator
        }
    }
}
protected override void OnBarUpdate()
{
    if(!alreadyExists)
    {
        //your OnBarUpdate() code goes here
    }
}

Please let me know if I may be of further assistance.

[koganam]

Hi,

Is there a way to ensure, that only a single instance of an indicator is loaded on chart?

What action/notification do you want to see if a user attempts to add a second instance?

[Shai Samuel]

Thank you Michael, this is really helpful.

koganam, what I would add to this code, is a Log message with NinjaTrader.Cbi.LogLevel.Alert, and return.

[Shai Samuel]

Michael, how can I check that what I am running is a chart and not for example Market Analyzer?

[NinjaTrader_MichaelM]

Hello Shai Samuel,

Please see this post for more information on this topic: http://ninjatrader.com/support/forum...ad.php?t=64014

Please let me know if you have any further questions.