Understanding AJAX Filters and Browser Navigation: Should the ‘Back’ Button Remember Filter Selections?

When developing a custom WordPress website for a freelance design client, one common feature developers implement is AJAX-based filtering. These filters allow visitors to refine content dynamically without reloading the page, providing a smooth user experience. However, a nuanced challenge often emerges: how should the site handle browser navigation, particularly the ‘Back’ button?

Recently, I encountered a scenario where I built bespoke AJAX category filters from scratch—since existing plugins didn’t meet the project’s specific requirements. The filters function flawlessly; users can select categories, and content updates seamlessly. Yet, I noticed that when a user clicks on a post and then hits the browser’s back button, the filters reset to their default state instead of restoring the previous selections.

This behavior isn’t explicitly communicated by the client, but it raises an important question: should we expect our custom filters to preserve their state through browser navigation? Handling this smoothly can significantly enhance user experience, ensuring visitors don’t lose their filters inadvertently.

Implementing persistent filter states requires additional development effort—likely a couple of days’ work—especially when starting from scratch. Given that this project has already been delivered at a favorable price point, balancing client needs with scope is essential.

So, what’s the best approach here? Should you proactively suggest adding this feature at an extra cost, or is it acceptable to keep the current setup as-is? Ultimately, transparency and aligning the scope with client expectations are key to delivering a satisfying final product.