[Solved] Given this Angular template snippet:<input type="text" name="username" ngModel required minlength="4" #usernameRef="ngModel"> <div *ngIf="usernameRef.invalid && usernameRef.... | Angular

Angular - Template-Driven Forms

Given this Angular template snippet:

<input type="text" name="username" ngModel required minlength="4" #usernameRef="ngModel">
<div *ngIf="usernameRef.invalid && usernameRef.touched">
  <small *ngIf="usernameRef.errors?.required">Username is required.</small>
  <small *ngIf="usernameRef.errors?.minlength">Minimum 4 characters.</small>
</div>

What will happen if the user types "abc" and then clicks outside the input?

AThe message "Minimum 4 characters." will be shown

BNo message will be shown because the input is valid

CThe message "Username is required." will be shown

DBoth messages will be shown

Step-by-Step Solution

Solution:

Step 1: Check input value against validation rules
The input value "abc" has 3 characters, which is less than the minlength of 4, so minlength validation fails.
Step 2: Determine which error messages show on invalid and touched
The input is not empty, so required is satisfied. Since usernameRef.invalid and usernameRef.touched are true, only the minlength error message appears.
Final Answer:
The message "Minimum 4 characters." will be shown -> Option A
Quick Check:
Input too short = minlength error shown [OK]

Quick Trick: Check which validation fails for input value and touched state [OK]

Common Mistakes:

MISTAKES

Showing required error when input is not empty
Showing no message when input is invalid and touched
Showing both errors when only one applies

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More Angular Quizzes

Given this Angular template snippet:

Step 1: Check input value against validation rules

Step 2: Determine which error messages show on invalid and touched

Final Answer:

Quick Check:

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