You want to create a form with two inputs bound to firstName and lastName properties. How do you update a fullName property automatically when either input changes using [(ngModel)]?
hard📝 component behavior Q8 of 15
Angular - Templates and Data Binding
You want to create a form with two inputs bound to firstName and lastName properties. How do you update a fullName property automatically when either input changes using [(ngModel)]?
AUse <code>[(ngModel)]</code> on inputs and update <code>fullName</code> inside a setter or <code>ngModelChange</code> event
BBind <code>fullName</code> directly with <code>[(ngModel)]</code> on both inputs
CUse only one input with <code>[(ngModel)]</code> bound to <code>fullName</code>
DUse <code>[(ngModel)]</code> but update <code>fullName</code> manually in the template
Step-by-Step Solution
Solution:
Step 1: Understand two-way binding on multiple inputs
Each input binds to its own property with [(ngModel)].
Step 2: Update combined property
Use a setter or listen to ngModelChange to update fullName when either changes.
Final Answer:
Use [(ngModel)] on inputs and update fullName inside a setter or ngModelChange event -> Option A
Quick Check:
Update combined property via setter or event = D [OK]
Quick Trick:Update combined values in setter or ngModelChange [OK]
Common Mistakes:
Binding fullName to both inputs
Using one input for fullName only
Trying to update fullName in template
Ignoring event or setter updates
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