Angular - Lifecycle Hooks
What does the
ngOnChanges lifecycle hook detect in an Angular component?What does the ngOnChanges lifecycle hook detect in an Angular component?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the role of
ngOnChangesThis hook is called when Angular sets or resets data-bound input properties.
Step 2: Identify what triggers
ngOnChangesIt triggers only when input properties from the parent change, not internal variables or template changes.
Final Answer:
Changes to input properties passed from a parent component -> Option CQuick Check:
ngOnChangesdetects input changes [OK]
Quick Trick: ngOnChanges runs only on input property changes [OK]
Common Mistakes:
- Thinking it detects internal variable changes
- Confusing it with template or style changes
- Assuming it runs on every component update
Master "Lifecycle Hooks" in Angular
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