Angular - Components
Which of the following selectors can be used to define an Angular component?
Which of the following selectors can be used to define an Angular component?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Angular selector rules
Angular component selectors must be valid CSS selectors and cannot start with a number or contain spaces.Step 2: Evaluate each option
selector: 'app-header' is a valid element selector. selector: '#appHeader' uses an ID selector which is invalid for components. selector: '123app' starts with a number, invalid. selector: 'app header' contains a space, invalid.Final Answer:
selector: 'app-header' -> Option AQuick Check:
Valid CSS selector without spaces or invalid characters [OK]
Quick Trick: Component selectors must be valid CSS selectors without spaces [OK]
Common Mistakes:
- Using spaces in selectors
- Starting selectors with numbers
- Using ID selectors for components
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