Understanding the Rendering Cycle in Angular Applications

2023/08/02

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The article explores the rendering cycle in Angular applications and the interaction between the browser, Angular, and zone.js. It explains how the browser provides the DOM and API for rendering, while JavaScript code, divided into framework code and application code, implements the business logic and updates the application state. Angular's change detection automatically runs after each asynchronous event to reflect the application state changes in the DOM. To know when these events occur, Angular uses the zone.js library, which intercepts all asynchronous events in the browser. Angular interacts with zone.js through NgZone, which restricts the scope of events that Angular should be notified about. The article also provides a step-by-step example of the rendering cycle and explains the browser's pipeline for rendering updates on the screen. Developers can use Chrome Dev Tools profiler to observe these operations. Overall, the article offers insights into the rendering process in Angular applications and highlights the importance of understanding the interaction between the browser, Angular, and zone.js.