OnProduct

Onproduct, often written as onProduct in camelCase, is a term used in software development to describe a callback or event handler associated with a product entity. It denotes a function or listener that should be invoked when a product-related event occurs, such as a product being loaded, viewed, added to cart, updated, or removed.

In front-end codebases, onProduct is commonly passed to components as a prop or registered as an event listener. For example: widget.on('product', onProduct); function onProduct(product) { // process product data }

In analytics and data layers, a product event may be emitted with a payload containing product identifiers, names, categories, prices, and variant information. An onProduct handler can map this payload to internal models, trigger UI updates, or push events to a data layer for tracking.

Variations in spelling and case are common; some projects use onproduct, OnProduct, or onProductChanged to reflect the specific event type. The term does not refer to a formal standard but rather to a general design pattern. It commonly appears in documentation and code examples across languages that support event-driven programming.

See also: event handler, callback, product data model, data layer, product event.