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In Angular, when should you show validation error messages for a form field?

easy🧠 Conceptual Q11 of 15
Angular - Template-Driven Forms
In Angular, when should you show validation error messages for a form field?
AOnly after the user has touched or changed the field and it is invalid
BImmediately when the form loads, regardless of user interaction
COnly after the form is submitted, ignoring field interaction
DAlways show errors even if the field is valid
Step-by-Step Solution
Solution:

  1. Step 1: Understand user experience best practice

    Showing errors only after user interaction prevents confusion and clutter.

  2. Step 2: Angular validation behavior

    Angular's touched or dirty flags help detect user interaction before showing errors.

  3. Final Answer:

    Only after the user has touched or changed the field and it is invalid -> Option A

  4. Quick Check:

    Show errors after user interaction = D [OK]
Quick Trick: Show errors only when user touched and invalid [OK]
Common Mistakes:
MISTAKES
  • Showing errors immediately on page load
  • Showing errors without checking if field is invalid
  • Waiting only for form submit to show errors

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