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Infinite Scroll

Overview

Infinite scroll loads more vehicles automatically as a shopper scrolls down the Search Results Page (SRP). The shopper does not click a Next Page button and does not navigate through page numbers.

Infinite scroll is integrated with filters and sorting. When a shopper changes filters mid-scroll, the grid refreshes from the top using the new filter state.

What shoppers experience

  • The SRP loads an initial set of vehicles.
  • As the shopper approaches the bottom of the grid, more vehicles appear.
  • When the shopper changes a filter, the grid resets to the top with the new results.

Why Marketplace uses infinite scroll

Inventory browsing is comparison-driven. Shoppers scan many vehicles and return to the same vehicles multiple times during a session. Infinite scroll keeps the browsing flow continuous.

How infinite scroll loads more vehicles

Marketplace loads additional results through the ERS (Edge Rendering Service) tunnel over a WebSocket connection.

Key behaviors:

  • The WebSocket stays open for the session.
  • Scroll loads do not require a new connection setup.
  • The request includes the current SRP URL state so the server loads the exact filtered and sorted view.

What is sent to the server

Each load request includes:

  • Offset: where to start in the result set
  • Current URL: filters and sort state
  • Current filter configuration: so the server can return consistent counts

The offset increments immediately when a scroll load is triggered to prevent duplicate requests during rapid scrolling.

What comes back

The server response includes everything needed to update the page without a reload:

  • Vehicle card data for the next batch
  • Updated total count
  • Updated facet counts
  • Updated page title
  • Updated SEO metadata (when refreshed for crawlers)

All updates are applied in one WebSocket response.

Filter changes vs scroll loads

  • Scroll loads append more vehicles to the existing grid.
  • Filter changes replace the full grid.

When filters change:

  • Offset resets to zero.
  • Sentinels reposition for the new result set.
  • Browsing resumes from the top of the refreshed grid.
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