How can you define a trigger with dynamic states that depend on a boolean variable isOpen to toggle between open and closed states in Angular animations?
hard📝 Application Q9 of 15
Angular - Animations
How can you define a trigger with dynamic states that depend on a boolean variable isOpen to toggle between open and closed states in Angular animations?
AChange CSS classes manually instead of using triggers
BBind <code>isOpen</code> directly to the trigger without states
CUse <code>[@triggerName]="isOpen ? 'open' : 'closed'"</code> in the template and define both states in the trigger
DUse two separate triggers for open and closed states
Step-by-Step Solution
Solution:
Step 1: Understand state binding in Angular animations
You bind the trigger state to an expression that returns the state name string. Using a ternary expression isOpen ? 'open' : 'closed' correctly toggles states.
Final Answer:
Use [@triggerName]="isOpen ? 'open' : 'closed'" in the template and define both states in the trigger -> Option C
Quick Check:
Bind trigger state with ternary expression [OK]
Quick Trick:Use ternary to toggle states in template binding [OK]
Common Mistakes:
Binding boolean directly without state names
Using multiple triggers instead of one
Avoiding Angular animation binding
Master "Animations" in Angular
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