Alternative text in Power BI is often treated as an afterthought, yet for screen‑reader users, it’s the only way a visual becomes meaningful. And while dynamic alt text is essential for interactive reports, writing it repeatedly across visuals and projects can quickly become tedious.
This article explores how DAX User‑Defined Functions (UDFs) can transform that workflow. By encapsulating reusable narrative patterns into native DAX functions, you can build a consistent, scalable foundation for accessible reporting, one that adapts to slicers, filters, drill‑downs and refreshes without rewriting the same logic over and over.
You’ll learn how UDFs work, how to structure parameters, how to call them from measures, and why separating narrative logic from model logic makes accessibility both easier and more maintainable. Whether you’re building reports solo or supporting a wider BI team, this approach helps you create alt text that’s dynamic, meaningful and genuinely helpful for screen‑reader users.
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