JavaScript hooks for transitions in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are JavaScript hooks in Vue transitions?

JavaScript hooks are special functions you can add to Vue's transition component to run code at specific moments during an element's entering or leaving animation, like before it starts or after it ends.

beginner

Name the four main JavaScript hooks used in Vue transitions.

The four main hooks are: <strong>before-enter</strong>, <strong>enter</strong>, <strong>leave</strong>, and <strong>after-leave</strong>. They let you control what happens before and during entering and leaving animations.

intermediate

How does the enter hook work in Vue transitions?

The enter hook runs when an element starts to appear. You can use it to add classes or styles to animate the element. It also receives a callback to tell Vue when the animation is done.

intermediate

Why use JavaScript hooks instead of CSS-only transitions in Vue?

JavaScript hooks let you run custom code during transitions, like starting complex animations, controlling timing precisely, or triggering other actions. CSS-only transitions are simpler but less flexible.

intermediate

What is the role of the callback function in Vue's enter and leave hooks?

The callback tells Vue when your JavaScript animation or transition is finished. Vue waits for this callback before removing or showing the element, ensuring smooth animations.

Which Vue transition hook runs right before an element starts to enter?

A leave

B enter

C before-enter

D after-leave

The before-enter hook runs just before the element begins its entering animation.

In Vue transitions, what must you call inside the enter hook to signal animation completion?

A done() callback

B start() function

C finish() method

D end() event

You call the done() callback to tell Vue the enter animation is finished.

Which hook would you use to run code after an element has fully left the DOM?

A after-leave

B enter

C leave

D before-enter

The after-leave hook runs after the element has been removed from the DOM.

Why might you choose JavaScript hooks over CSS transitions in Vue?

A Because JavaScript hooks are easier to write

B Because CSS transitions are slower

C To avoid using classes

D To run custom code during animations

JavaScript hooks let you run custom code during transitions, offering more control.

Which Vue transition hook is called when an element starts to leave?

A enter

B leave

C before-enter

D after-leave

The leave hook runs when an element begins its leaving animation.

Explain how JavaScript hooks control the timing of transitions in Vue.

Think about how Vue waits for your code to finish before changing the element.

Describe a simple example of using the enter and leave hooks in a Vue transition.

Imagine fading an element in and out with JavaScript hooks.