What happens during the lifecycle of a React component?
Câu trả lời
During the lifecycle of a React component, several key phases occur where specific methods are called to manage the component from creation to destruction. These phases include Initialization, Mounting, Updating, and Unmounting. Each phase has distinct responsibilities and associated methods that allow developers to hook into the lifecycle for executing code at the right time.
Initialization
In the Initialization phase, the component sets up its initial state and props. This is typically done in the constructor of a class component, where you can initialize state and bind event handlers. This phase sets the groundwork for the component before it is mounted into the DOM[4][5].
Mounting
Mounting is the phase where the React component is actually inserted into the DOM. This phase is critical as it prepares the component to be rendered for the first time. The main lifecycle methods involved in this phase are:
constructor(): Called before the component is mounted, used for setting up state and other initial values.
static getDerivedStateFromProps(): Invoked right before rendering the component, both on the initial mount and on subsequent updates. It enables the component state to be updated as a function of changes in props over time.
render(): The only required method in a class component, render tells React what should be displayed on the screen.
componentDidMount(): Called immediately after the component is mounted. This is where you can perform any DOM manipulations or data fetching operations[1][2][3][4][6].
Updating
The Updating phase occurs when the props or state of the component change, which triggers a re-render of the component. The methods called during this phase include:
