Angular - Reactive Forms
Which of the following is the correct signature for a synchronous custom validator function in Angular?
Which of the following is the correct signature for a synchronous custom validator function in Angular?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Recall Angular validator function signature
A synchronous custom validator takes an AbstractControl and returns ValidationErrors or null.Step 2: Match the correct function signature
function myValidator(control: AbstractControl): ValidationErrors | null matches the required signature exactly, others do not fit Angular patterns.Final Answer:
function myValidator(control: AbstractControl): ValidationErrors | null -> Option BQuick Check:
Validator signature = function myValidator(control: AbstractControl): ValidationErrors | null [OK]
Quick Trick: Validator functions take AbstractControl and return errors or null [OK]
Common Mistakes:
MISTAKES- Using wrong parameter types like string or Event
- Returning boolean instead of error object or null
- Missing return type or returning void
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