v-else and v-else-if in Vue - Step-by-Step Execution

Concept Flow - v-else and v-else-if

Evaluate v-if condition

Yes↓

Render v-if block

↓

Skip v-else-if and v-else blocks

No↓

Evaluate v-else-if condition

Yes↓

Render v-else-if block

↓

Skip v-else block

No↓

Render v-else block

↓

End of conditional rendering

Vue checks the v-if condition first. If false, it checks v-else-if conditions in order. If none match, it renders the v-else block.

Execution Sample

Vue

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

This code shows how Vue chooses which block to render based on the value of 'status'.

Execution Table

Step	Condition Checked	Condition Result	Block Rendered
1	status === 'loading'	False	No
2	status === 'success'	True	Yes (v-else-if block)
3	v-else block	Skipped	No

💡 v-else-if condition is true, so its block is rendered and v-else block is skipped.

Variable Tracker

Variable	Start	After Step 1	After Step 2	Final
status	'success'	'success'	'success'	'success'

Key Moments - 2 Insights

Why does Vue skip the v-else block when a v-else-if condition is true?

Because v-else only runs if all previous v-if and v-else-if conditions are false, as shown in execution_table step 3.

Can v-else be used without a preceding v-if or v-else-if?

No, v-else must directly follow a v-if or v-else-if block to work properly, otherwise Vue will give a warning.

Visual Quiz - 3 Questions

Look at the execution table, what block is rendered at step 2?

A v-else-if block

B v-if block

C v-else block

D No block rendered

💡 Hint

Check the 'Block Rendered' column at step 2 in the execution_table.

At which step does Vue decide not to render the v-else block?

A Step 1

B Step 2

C Step 3

D Never

💡 Hint

Look at the 'Condition Result' and 'Block Rendered' columns for step 3 in the execution_table.

If 'status' was 'loading', which block would Vue render?

A v-else-if block

B v-if block

C v-else block

D No block rendered

💡 Hint

Refer to the condition 'status === "loading"' in execution_table step 1.

Concept Snapshot

Vue conditional rendering uses v-if, v-else-if, and v-else.
v-if checks first; if false, v-else-if checks next.
v-else runs only if all previous conditions are false.
v-else must follow v-if or v-else-if directly.
Only one block renders based on the first true condition.

Full Transcript

This lesson shows how Vue decides which block to render using v-if, v-else-if, and v-else. Vue first checks the v-if condition. If it is true, Vue renders that block and skips the others. If false, Vue checks each v-else-if condition in order. If one is true, Vue renders that block and skips the rest. If none are true, Vue renders the v-else block. The example code uses a variable 'status' to decide which message to show. The execution table traces the condition checks and which block renders. The variable tracker shows 'status' stays 'success' throughout. Key moments clarify why v-else only runs if all previous conditions fail and that v-else must follow v-if or v-else-if. The quiz questions help check understanding by asking which block renders at each step and what happens if 'status' changes. This visual trace helps beginners see exactly how Vue picks which block to show.