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- Article · Angular
Angular Reactive Forms – Dynamic Validation with Real-Time Issue and Fix
This article explains how to handle dynamic form validation in Angular Reactive Forms. It shares a real-world scenario where validation rules need to change based on user input like requiring a PAN number for individuals and a company name for organizations. The article highlights a common mistake developers make: forgetting to call updateValueAndValidity() after setting or clearing validators, which causes the form to behave unexpectedly. It walks through the issue, shows the incorrect and corrected code, and provides a reusable custom validator for PAN format. Overall, this article helps developers understand how to implement clean, dynamic validation logic in Angular forms with a practical example and real-time bug resolution.
