Angular - Reactive Forms
What does a custom validator function in Angular return when the input is valid?
What does a custom validator function in Angular return when the input is valid?
easy🧠 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Angular validator return values
Angular custom validators returnnullwhen the input passes validation, meaning no errors.Step 2: Identify the valid return for no errors
Returningnullsignals the form control is valid, while any object means invalid.Final Answer:
null -> Option DQuick Check:
Valid input returns null [OK]
Quick Trick: Valid inputs always return null from validators [OK]
Common Mistakes:
MISTAKES- Returning true or false instead of null or error object
- Returning empty string instead of null
- Confusing valid with invalid return values
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