You have component properties firstName and lastName bound to two input fields using ngModel. How can you ensure a fullName property updates automatically whenever either input changes?
hard📝 component behavior Q8 of 15
Angular - Template-Driven Forms
You have component properties firstName and lastName bound to two input fields using ngModel. How can you ensure a fullName property updates automatically whenever either input changes?
AUse a getter property that concatenates <code>firstName</code> and <code>lastName</code> dynamically
BManually update <code>fullName</code> inside each input's <code>(ngModelChange)</code> event handler
CBind <code>fullName</code> directly to one of the inputs using <code>ngModel</code>
DUse <code>ngModel</code> only on <code>fullName</code> and remove bindings from <code>firstName</code> and <code>lastName</code>
Step-by-Step Solution
Solution:
Step 1: Understand reactive updates
A getter property recalculates fullName whenever firstName or lastName changes.
Step 2: Avoid manual event handling
Using a getter avoids manual updates and keeps code clean.
Final Answer:
Use a getter property that concatenates firstName and lastName dynamically -> Option A
Quick Check:
Getter recalculates on property change [OK]
Quick Trick:Use getter for fullName to auto-update [OK]
Common Mistakes:
MISTAKES
Manually updating fullName in event handlers
Binding fullName directly to inputs
Removing bindings from firstName and lastName
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