v-else and v-else-if in Vue - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What will this Vue template render?

Given the following Vue template snippet, what will be rendered if status is 'loading'?

<template>
  <div>
    <p v-if="status === 'success'">Success!</p>
    <p v-else-if="status === 'loading'">Loading...</p>
    <p v-else>Error occurred</p>
  </div>
</template>

A Success!

B Nothing is rendered

C Error occurred

D Loading...

💡 Hint

Check which condition matches the status value.

The v-if checks if status is 'success', which is false. Then v-else-if checks if status is 'loading', which is true, so it renders 'Loading...'.

📝 Syntax

intermediate

Which option is a valid use of v-else in Vue?

Choose the correct Vue template snippet that uses v-else properly.

A

<p v-if="show">Shown</p>
<p v-else>Hidden</p>

B

<p v-else>Hidden</p>
<p v-if="show">Shown</p>

C

<p v-if="show">Shown</p>
<p v-else v-if="!show">Hidden</p>

D

<p v-if="show">Shown</p>
<p v-else="true">Hidden</p>

💡 Hint

v-else must immediately follow a v-if or v-else-if element.

Option A correctly places v-else immediately after v-if. Option A reverses the order, which is invalid. Option A mixes v-else and v-if on the same element, which is invalid. Option A uses an invalid attribute value for v-else.

🔧 Debug

advanced

Why does this Vue template cause a compilation error?

Examine the Vue template below and identify the cause of the error.

<template>
  <div>
    <p v-if="isActive">Active</p>
    <span>Not active</span>
    <p v-else>Inactive</p>
  </div>
</template>

A The <code>v-else</code> must be immediately after the <code>v-if</code> element without any other elements in between.

B The <code>v-else</code> directive cannot be used on a <code>p</code> element.

C The <code>v-if</code> directive is missing a closing tag.

D The <code>v-else</code> must have a condition like <code>v-else-if</code>.

💡 Hint

Check the placement of v-else relative to v-if.

Vue requires v-else to be immediately after the v-if or v-else-if element. Here, a span is between them, causing a compilation error.

❓ state_output

advanced

What is the rendered output when count is 0?

Consider this Vue template and data:

<template>
  <div>
    <p v-if="count > 0">Positive</p>
    <p v-else-if="count === 0">Zero</p>
    <p v-else>Negative</p>
  </div>
</template>

<script setup>
import { ref } from 'vue'
const count = ref(0)
</script>

A Positive

B Zero

C Negative

D No output

💡 Hint

Check the conditions in order and see which matches count.

count is 0, so count > 0 is false, count === 0 is true, so 'Zero' is rendered.

🧠 Conceptual

expert

Why must v-else not have a condition?

In Vue, v-else cannot have a condition like v-if or v-else-if. Why is this restriction important?

A Because <code>v-else</code> elements are always hidden and never rendered.

B Because Vue does not support multiple conditions on the same element.

C Because <code>v-else</code> is a fallback that automatically applies when previous conditions fail, adding a condition would break this logic.

D Because <code>v-else</code> must be used only inside <code>v-for</code> loops.

💡 Hint

Think about the purpose of v-else as a fallback.

v-else is designed to show content only if all previous v-if and v-else-if conditions fail. Adding a condition would contradict its role as a fallback.

Practice

1. What does the v-else directive do in Vue?

easy

A. Runs only if the first v-if condition is true

B. Runs when all previous v-if and v-else-if conditions are false

C. Runs independently of any other condition

D. Runs only if the last v-else-if condition is true

Solution

1. Step 1: Understand v-if and v-else-if behavior

   v-if runs if its condition is true; v-else-if runs if the previous v-if or v-else-if was false and its own condition is true.

2. Step 2: Understand v-else behavior

   v-else runs only if all previous v-if and v-else-if conditions are false, acting as a fallback.

3. Final Answer:

   Runs when all previous v-if and v-else-if conditions are false -> Option B

4. Quick Check:

   v-else = fallback [OK]

Hint: Remember: v-else is the fallback after all conditions fail [OK]

Common Mistakes:

• Thinking v-else runs independently
• Confusing v-else with v-else-if
• Assuming v-else requires a condition

2. Which of the following is the correct syntax for using v-else-if in Vue?

easy

A. <div v-else-if="condition">Content</div>

B. <div v-else-if>condition</div>

C. <div v-else-if:condition>Content</div>

D. <div v-else-if(condition)>Content</div>

Solution

1. Step 1: Recall Vue directive syntax

   Vue directives use the format v-directive="expression" to bind conditions or values.

2. Step 2: Check each option's syntax

   <div v-else-if="condition">Content</div> uses v-else-if="condition", which is correct. Options B, C, and D use invalid syntax forms.

3. Final Answer:

   <div v-else-if="condition">Content</div> -> Option A

4. Quick Check:

   Directive syntax = v-else-if="condition" [OK]

Hint: Use quotes for conditions in v-else-if [OK]

Common Mistakes:

• Omitting quotes around condition
• Using parentheses or colons incorrectly
• Writing v-else-if without a condition

3. Given this Vue template snippet:

<div v-if="score >= 90">A</div>
<div v-else-if="score >= 75">B</div>
<div v-else-if="score >= 60">C</div>
<div v-else>F</div>

What will be displayed if score is 80?

medium

A. A

B. C

C. B

D. F

Solution

1. Step 1: Evaluate the first condition score >= 90

   Since 80 is less than 90, this condition is false, so this block does not render.

2. Step 2: Evaluate the second condition score >= 75

   80 is greater than or equal to 75, so this condition is true. Vue renders this block and skips the rest.

3. Final Answer:

   B -> Option C

4. Quick Check:

   80 >= 75 = true, so output is B [OK]

Hint: Check conditions top to bottom; first true runs [OK]

Common Mistakes:

• Choosing the first condition without checking value
• Ignoring order of v-else-if blocks
• Assuming multiple blocks render

4. What is wrong with this Vue template?

<div v-if="isActive">Active</div>
<div v-else-if>Inactive</div>
<div v-else>Unknown</div>

medium

A. The v-else-if directive is missing a condition

B. The v-else directive cannot be used after v-else-if

C. The v-if directive must have a closing tag

D. There should be no v-else after v-if

Solution

1. Step 1: Check v-else-if usage

   v-else-if requires a condition to evaluate. Here, it is used without any condition, which is invalid syntax.

2. Step 2: Verify other directives

   v-else can follow v-else-if, and v-if has proper closing tags, so no issues there.

3. Final Answer:

   The v-else-if directive is missing a condition -> Option A

4. Quick Check:

   v-else-if needs a condition [OK]

Hint: v-else-if always needs a condition in quotes [OK]

Common Mistakes:

• Leaving v-else-if without condition
• Thinking v-else can't follow v-else-if
• Confusing v-if closing tags

5. You want to display a message based on a user's status using Vue directives. The statuses are: 'admin', 'editor', and others. Which template correctly uses v-if, v-else-if, and v-else to show 'Admin Access', 'Editor Access', or 'Guest Access' respectively?

hard

A. <div v-if="status === 'admin'">Admin Access</div>
<div v-else>Editor Access</div>
<div v-else-if="status === 'editor'">Guest Access</div>

B. <div v-if="status === 'admin'">Admin Access</div>
<div v-if="status === 'editor'">Editor Access</div>
<div v-else>Guest Access</div>

C. <div v-if="status === 'admin'">Admin Access</div>
<div v-else-if>Editor Access</div>
<div v-else>Guest Access</div>

D. <div v-if="status === 'admin'">Admin Access</div>
<div v-else-if="status === 'editor'">Editor Access</div>
<div v-else>Guest Access</div>

Solution

1. Step 1: Check the chaining of conditions

   <div v-if="status === 'admin'">Admin Access</div>
   <div v-else-if="status === 'editor'">Editor Access</div>
   <div v-else>Guest Access</div>

   correctly uses v-if, then v-else-if with a condition, then v-else as fallback.

2. Step 2: Verify other options for errors

   <div v-if="status === 'admin'">Admin Access</div>
   <div v-if="status === 'editor'">Editor Access</div>
   <div v-else>Guest Access</div>

   uses two v-if directives, which are independent and can cause multiple blocks to render.

   <div v-if="status === 'admin'">Admin Access</div>
   <div v-else-if>Editor Access</div>
   <div v-else>Guest Access</div>

   uses v-else-if without a condition, which is invalid.

   <div v-if="status === 'admin'">Admin Access</div>
   <div v-else>Editor Access</div>
   <div v-else-if="status === 'editor'">Guest Access</div>

   places v-else before v-else-if, which breaks the chain.

3. Final Answer:

   The template that correctly chains v-if, v-else-if with condition, and v-else -> Option D

4. Quick Check:

   v-if, v-else-if with condition, then v-else [OK]

Hint: Chain conditions: v-if, v-else-if with condition, then v-else [OK]

Common Mistakes:

• Using multiple v-if instead of v-else-if
• Omitting condition in v-else-if
• Placing v-else before v-else-if