NinjaScript tutorials from someone who’s been writing it since NT6.5. Start at the top if you’re new — or jump to whatever you’re stuck on.
A property’s C# identifier isn’t always what you want users to see in the indicator settings dialog. Period reads fine; atrPeriodLookback looks like a raw variable name. The [Display] attribute lets you set a friendlier label, add a tooltip, group related properties together, and control the order they appear. Four parameters cover almost all of…
Search TradingView’s community scripts for terms like “machine learning” or “AI” and you’ll find a long list of community-built indicators that lean on one of the simplest and oldest algorithms in ML. k-Nearest Neighbors — the algorithm we’re building from scratch in NinjaScript today — dates to the 1950s and remains one of the most…
You wrote an indicator. It works great on a chart. Now you want to use it from a strategy — you write var sma = MySma(20); in State.DataLoaded and expect the cross-script reference to just work. Or you want to optimize Period in Strategy Analyzer and see which value produces the best backtest. How does…
At the end of Calculate Modes, we looked at an arrow-on-condition indicator that behaved differently depending on whether it was running on historical bars or live ticks. The fix in that post was a draw-cleanup pattern — remove the arrow before each OnBarUpdate pass and let the live condition repaint it. Good enough if you…
You wrote your first custom indicator. It plots cleanly, the math is right, you’re happy. Then you want to see it update live instead of only at bar close, so you flip Calculate from OnBarClose to OnPriceChange — a one-line change — and suddenly what shows up on the chart isn’t quite what it was…
You’ve read enough of the foundational posts in this series to know what OnBarUpdate, OnStateChange, and Plots do in isolation. This post puts them together. By the end of this walkthrough you’ll have a working NinjaScript indicator on your chart that plots a moving average and recolors itself based on slope — green when it’s…
I’m not “back to posting.” I’m not starting a schedule. I’m not making promises. I’m not doing the whole “consistent content” thing again just to disappear in a week. If anything, this post is the opposite. This might be my last post. I’m undecided. I’m writing this more for me than for anyone else. I’ve…
In Part 3, we laid the groundwork for our Better Moving Average (BMA) indicator — setting up the file structure, building inputs for multiple moving average types, and wiring up the core logic. But identifying the average is only half the story. In this post, we’re diving into trend detection. 📉📈 You’ll learn how to:…
If you’ve ever wanted to track live trades, monitor bid/ask changes, or build a tool that reacts faster than a bar can form, OnMarketData() is where the action begins. Unlike OnBarUpdate(), which reacts to completed bars, OnMarketData() responds to every change in Level I market data — including bid, ask, and last price updates. That…
Debugging is one of the most underrated skills when it comes to writing NinjaScript indicators. You can have the cleanest code in the world, but if the logic isn’t behaving how you expect—or worse, it’s silently failing—you’ll find yourself stuck staring at a chart wondering what went wrong. In NinjaTrader, debugging isn’t quite the same…
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