Lifecycle Hooks in Angular
Exploring the Lifecycle Hooks in Angular
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Angular’s lifecycle hooks are methods in Angular components and directives that allow you to tap into key moments in the lifecycle of a component or directive. Below is a description of the main lifecycle hooks with their execution order and a graph to illustrate their flow:
Key Lifecycle Hooks in Angular
ngOnChanges:
Triggered when the input properties of a component or directive are changed.
Receives a
SimpleChangesobject containing the previous and current values of the bound inputs.
2. ngOnInit:
Called once, after the first
ngOnChanges.Used for initialization logic that requires input properties to be set.
3. ngDoCheck:
Called during every change detection run, after
ngOnChangesandngOnInit.Used to detect changes that Angular does not.
4. ngAfterContentInit:
Called once after the content (e.g., <ng-content>) is projected into the component.
- Used for logic that depends on projected content.
5. ngAfterContentChecked:
Called after every check of the projected content.
- Used for logic that depends on content changes.
6. ngAfterViewInit:
Called once after the component’s view and its children have been initialized.
- Useful for interacting with child components or DOM elements.
7. ngAfterViewChecked:
Called after the view (and child views) have been checked.
Used for logic that depends on view changes.
8. ngOnDestroy:
Called just before the component or directive is destroyed.
Used for cleanup tasks, like unsubscribing from observables or detaching event handlers.
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