You want to bind the value property of an <input> element to a component variable userName. Which is the correct way to update the input's value dynamically when userName changes?

hard📝 component behavior Q8 of 15

Angular - Templates and Data Binding

You want to bind the value property of an <input> element to a component variable userName. Which is the correct way to update the input's value dynamically when userName changes?

A<input [value]="userName">

B<input #value="userName">

C<input (value)="userName">

D<input value="{{userName}}">

Step-by-Step Solution

Solution:

Step 1: Identify dynamic property binding
To update the input's value dynamically, use property binding with square brackets.
Step 2: Eliminate other options
uses interpolation which sets initial value but won't update dynamically. is event binding, and is template reference.
Final Answer:
<input [value]=\"userName\"> -> Option A
Quick Check:
Use [value] for dynamic input value binding [OK]

Quick Trick: Use [value]="variable" for dynamic input values [OK]

Common Mistakes:

Using interpolation which is static after first render
Confusing event binding with property binding
Using template references incorrectly

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You want to bind the value property of an <input> element to a component variable userName. Which is the correct way to update the input's value dynamically when userName changes?

Step 1: Identify dynamic property binding

Step 2: Eliminate other options

Final Answer:

Quick Check:

Want More Practice?