Angular - Lifecycle Hooks
In an Angular component, where is the best place to initiate an HTTP request to load data when the component is created, and why?
In an Angular component, where is the best place to initiate an HTTP request to load data when the component is created, and why?
hard📝 lifecycle Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Lifecycle Timing
The constructor runs before Angular sets input properties; ngOnInit runs after inputs are set.Step 2: Place HTTP Call in ngOnInit
ngOnInit is the recommended place to perform initialization logic like HTTP requests.Step 3: Avoid Constructor for HTTP Calls
Constructor should be lightweight; HTTP calls may depend on inputs not yet available.Final Answer:
Inside the ngOnInit method, because input properties are set and the component is initialized -> Option AQuick Check:
Use ngOnInit for initialization logic after inputs are ready [OK]
Quick Trick: Start HTTP calls in ngOnInit, not constructor [OK]
Common Mistakes:
- Starting HTTP calls in constructor
- Waiting until ngAfterViewInit unnecessarily
- Manually calling initialization methods
Master "Lifecycle Hooks" in Angular
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Angular Quizzes