You want to toggle a boolean property isVisible in your component when a button is clicked. Which template statement correctly does this?

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Angular - Templates and Data Binding

You want to toggle a boolean property isVisible in your component when a button is clicked. Which template statement correctly does this?

A<button (click)="isVisible ? false : true">Toggle</button>

B<button (click)="toggleIsVisible()">Toggle</button>

C<button (click)="isVisible = !isVisible">Toggle</button>

D<button (click)="isVisible == !isVisible">Toggle</button>

Step-by-Step Solution

Solution:

Step 1: Understand toggling boolean in template
You can directly assign the negation of isVisible to itself in the template statement.
Step 2: Evaluate each option
<button (click)=\"isVisible = !isVisible\">Toggle</button> correctly toggles isVisible by assigning !isVisible. <button (click)=\"toggleIsVisible()\">Toggle</button> requires a method, the ternary option is an expression but not an assignment, and the comparison option uses == instead of assignment.
Final Answer:
<button (click)=\"isVisible = !isVisible\">Toggle</button> -> Option C
Quick Check:
Use assignment with !property to toggle booleans [OK]

Quick Trick: Toggle booleans with isVisible = !isVisible in template [OK]

Common Mistakes:

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