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Identify the issue in this Angular template:

medium📝 Debug Q6 of 15
Angular - Templates and Data Binding
Identify the issue in this Angular template:
<input [ngModel]="userName" (ngModelChange)="userName = $event" />
<p>User: {{userName}}</p>
AThe component property userName is not declared.
BThe input element is missing a closing tag.
CThe interpolation syntax is incorrect.
DThis syntax can cause change detection issues compared to using [(ngModel)].
Step-by-Step Solution
Solution:
  1. Step 1: Understand the syntax

    The snippet uses separate property binding and event binding instead of the shorthand [(ngModel)].
  2. Step 2: Potential issues

    This can cause timing or change detection problems because the update cycle is split.
  3. Step 3: Preferred approach

    Using [(ngModel)] ensures atomic two-way binding and better synchronization.
  4. Final Answer:

    This syntax can cause change detection issues compared to using [(ngModel)]. -> Option D
  5. Quick Check:

    Use [(ngModel)] for reliable two-way binding [OK]
Quick Trick: Separate bindings may cause sync issues; prefer [(ngModel)] [OK]
Common Mistakes:
  • Ignoring change detection implications
  • Assuming separate bindings are equivalent to two-way binding
  • Overlooking the importance of atomic updates

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