Transition modes (in-out, out-in) in Vue - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the transition mode to 'in-out' in a Vue <transition> component.

Vue

<transition mode="[1]">
  <div v-if="show">Content</div>
</transition>

Drag options to blanks, or click blank then click option'

Ain-out

Bout-in

Cfade

Dslide

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'fade' or 'slide' as mode values, which are not valid modes.

Confusing 'in-out' with 'out-in'.

The mode attribute controls the sequence of entering and leaving transitions. 'in-out' means the new element enters first, then the old leaves.

2fill in blank

medium

Complete the code to set the transition mode to 'out-in' in a Vue <transition> component.

Vue

<transition mode="[1]">
  <div v-if="visible">Panel</div>
</transition>

Drag options to blanks, or click blank then click option'

Ain-out

Bslide

Cfade

Dout-in

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'in-out' instead of 'out-in'.

Using invalid mode values like 'fade' or 'slide'.

The 'out-in' mode makes the old element leave first, then the new element enters.

3fill in blank

hard

Fix the error in the transition mode attribute to correctly use 'out-in'.

Vue

<transition mode=[1]>
  <div v-if="active">Box</div>
</transition>

Drag options to blanks, or click blank then click option'

A"out-in"

B"in-out"

C'out-in'

Dout-in

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the mode value, causing a syntax error.

Using single quotes instead of double quotes in HTML attributes.

The mode attribute value must be a string wrapped in double quotes inside the template.

4fill in blank

hard

Fill both blanks to create a Vue <transition> with mode 'in-out' and a fade transition name.

Vue

<transition mode="[1]" name="[2]">
  <p v-if="showText">Hello</p>
</transition>

Drag options to blanks, or click blank then click option'

Ain-out

Bout-in

Cfade

Dslide

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing mode and name values.

Using invalid mode or name values.

The mode 'in-out' controls transition order, and 'fade' is the transition name for CSS classes.

5fill in blank

hard

Fill all three blanks to create a Vue <transition> with mode 'out-in', name 'slide', and a div with key 'box'.

Vue

<transition mode="[1]" name="[2]">
  <div v-if="visible" key=[3]>Slide Content</div>
</transition>

Drag options to blanks, or click blank then click option'

Ain-out

Bout-in

C"slide"

D"box"

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the key value.

Using wrong mode or name values.

Omitting the key attribute causing transition glitches.

The mode is 'out-in' for transition order, name is 'slide' for CSS, and the key must be a quoted string 'box' for Vue to track element identity.

Practice

1. What does the in-out transition mode do in Vue transitions?

easy

A. No transition happens; elements switch instantly.

B. The old element leaves first, then the new element enters.

C. Both elements enter and leave simultaneously.

D. The new element enters first, then the old element leaves.

Solution

1. Step 1: Understand transition modes

   Vue transition modes control the order of entering and leaving animations.

2. Step 2: Recall in-out behavior

   in-out means the new element enters first, then the old element leaves.

3. Final Answer:

   The new element enters first, then the old element leaves. -> Option D

4. Quick Check:

   in-out = new enters first [OK]

Hint: Remember: in-out means 'in' happens before 'out' [OK]

Common Mistakes:

• Confusing in-out with out-in order
• Thinking both enter and leave happen simultaneously
• Assuming no animation delay

2. Which is the correct syntax to apply the out-in transition mode in a Vue <transition> component?

easy

A.

B.

C.

D.

Solution

1. Step 1: Identify correct mode attribute

   The mode attribute on <transition> sets the transition mode.

2. Step 2: Match mode value for out-in

   The correct value for the mode that makes old element leave first is "out-in".

3. Final Answer:

   <transition mode="out-in"> -> Option A

4. Quick Check:

   out-in mode syntax = mode="out-in" [OK]

Hint: Use mode="out-in" exactly for old leaves first [OK]

Common Mistakes:

• Using mode="in-out" instead of out-in
• Using invalid mode values like "both" or "enter-leave"
• Omitting quotes around mode value

3. Given this Vue template snippet:

<transition mode="out-in">
  <component :is="view" />
</transition>

If view changes from "A" to "B", what happens first?

medium

A. Component A leaves, then component B enters.

B. Component B enters, then component A leaves.

C. Both components enter and leave at the same time.

D. No transition occurs; component switches instantly.

Solution

1. Step 1: Identify transition mode in code

   The mode is set to "out-in", meaning the old component leaves first.

2. Step 2: Understand transition order

   When view changes, component A leaves first, then component B enters.

3. Final Answer:

   Component A leaves, then component B enters. -> Option A

4. Quick Check:

   out-in mode = old leaves first [OK]

Hint: out-in means old leaves before new enters [OK]

Common Mistakes:

• Thinking new enters before old leaves in out-in mode
• Assuming simultaneous enter and leave
• Ignoring the mode attribute effect

4. You wrote this Vue transition:

<transition mode="in-out">
  <div v-if="show">Hello</div>
</transition>

But the old element leaves before the new one enters. What is the likely mistake?

medium

A. You need to add a key attribute to the div.

B. You forgot to add v-show instead of v-if.

C. You used mode="in-out" but expected out-in behavior.

D. You must wrap the element in a <transition-group> instead.

Solution

1. Step 1: Analyze transition mode and behavior

   The mode is set to "in-out", which means new enters first, old leaves after.

2. Step 2: Compare expected and actual behavior

   The old element leaves before new enters, which matches "out-in" mode, not "in-out".

3. Final Answer:

   You used mode="in-out" but expected out-in behavior. -> Option C

4. Quick Check:

   in-out mode means new enters first [OK]

Hint: Match mode to expected order: in-out vs out-in [OK]

Common Mistakes:

• Confusing in-out and out-in modes
• Thinking v-if vs v-show affects mode order
• Assuming transition-group is needed for single elements

5. You want to create a Vue transition where the old element fades out completely before the new element fades in. Which transition mode and setup should you use?

hard

A. Use mode="in-out" with CSS fade-in on enter and fade-out on leave.

B. Use mode="out-in" with CSS fade-out on leave and fade-in on enter.

C. Use no mode and rely on simultaneous fade animations.

D. Use mode="both" with combined fade animations.

Solution

1. Step 1: Understand desired animation order

   You want the old element to fade out completely before the new element fades in.

2. Step 2: Choose correct transition mode

   out-in mode makes the old element leave first, then the new enters, matching the requirement.

3. Step 3: Confirm CSS setup

   Use CSS classes for fade-out on leave and fade-in on enter to achieve smooth transitions.

4. Final Answer:

   Use mode="out-in" with CSS fade-out on leave and fade-in on enter. -> Option B

5. Quick Check:

   Old fades out first = out-in mode [OK]

Hint: Old fades out first? Use out-in mode [OK]

Common Mistakes:

• Using in-out mode which enters new before old leaves
• Assuming simultaneous fades without mode
• Using invalid mode values like "both"