Web Components API Lifecycle Methods

Web Components have several built-in lifecycle methods that allow you to hook into different stages of the component's lifecycle:

  • connectedCallback(): Called when the component is inserted into the DOM.
  • disconnectedCallback(): Called when the component is removed from the DOM.
  • adoptedCallback(): Called when the component is moved to a new document.
  • attributeChangedCallback(name, oldValue, newValue): Called when an observed attribute of the component changes.

These methods allow you to perform setup, cleanup, and other actions at the appropriate times during the component's lifecycle.

Modular Development

Web Components enable modular development by allowing you to encapsulate functionality, styles, and markup within a self-contained unit. This promotes code reuse, maintainability, and separation of concerns.

Some best practices for modular development with Web Components include:

  • Encapsulate Functionality: Implement all the logic, styles, and markup related to a specific feature or UI element within a single custom element.

  • Separate Concerns: Keep the component's internal implementation details hidden from the outside world, exposing only the necessary API (attributes, properties, methods).

  • Dependency Management: Manage dependencies between components carefully to avoid conflicts and ensure predictable behavior.

  • Composability: Design components to be composable, allowing them to be combined and nested to build more complex UIs.