v-show vs v-if difference in Vue - Visual Side-by-Side Comparison

Concept Flow - v-show vs v-if difference

Component Render Start

↓

Evaluate v-if Condition

|Yes↓

Render Element in DOM

↓

Element Visible

↓

Condition False?

No↓

Remove Element from DOM

↓

Evaluate v-show Condition

|Yes↓

Element in DOM

↓

Set CSS display: block

↓

Element Visible

↓

Condition False?

No↓

Set CSS display: none

↓

Element Hidden but in DOM

v-if adds or removes the element from the DOM based on condition. v-show keeps the element in the DOM but toggles its visibility using CSS.

Execution Sample

Vue

<template>
  <div v-if="showIf">Visible with v-if</div>
  <div v-show="showShow">Visible with v-show</div>
</template>

<script setup>
import { ref } from 'vue'
const showIf = ref(true)
const showShow = ref(true)
</script>

This Vue component shows two divs controlled by v-if and v-show conditions.

Execution Table

Step	Condition	v-if DOM Action	v-show DOM Action	Element Visible?
1	showIf = true, showShow = true	Add element to DOM	Element in DOM, display:block	Both visible
2	showIf = false, showShow = true	Remove element from DOM	Element in DOM, display:block	v-if hidden, v-show visible
3	showIf = false, showShow = false	Remove element from DOM	Element in DOM, display:none	Both hidden (v-show hidden by CSS)
4	showIf = true, showShow = false	Add element to DOM	Element in DOM, display:none	v-if visible, v-show hidden by CSS

💡 Execution stops after all condition combinations are evaluated.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4
showIf	true	true	false	false	true
showShow	true	true	true	false	false

Key Moments - 3 Insights

Why does v-if remove the element from the DOM but v-show does not?

v-if conditionally renders the element, so when false it removes it completely (see execution_table step 2). v-show always keeps the element in the DOM but toggles CSS display property (see step 3).

If I want to toggle visibility frequently, which should I use?

Use v-show because it only changes CSS display without removing the element, making toggling faster (see execution_table steps 3 and 4).

Does v-show affect accessibility differently than v-if?

Yes, because v-show keeps the element in the DOM but hidden, screen readers might still detect it unless additional ARIA attributes are used.

Visual Quiz - 3 Questions

Look at the execution table, at step 3 what is the v-show DOM action?

A Remove element from DOM

B Element in DOM, display:none

C Add element to DOM

D Element in DOM, display:block

💡 Hint

Check the 'v-show DOM Action' column at step 3 in the execution_table.

At which step does v-if remove the element from the DOM?

A Step 4

B Step 1

C Step 2

D Step 3

💡 Hint

Look at the 'v-if DOM Action' column in the execution_table.

If showShow changes from true to false, what happens to the element controlled by v-show?

A Element remains in DOM but hidden with CSS

B Element becomes visible

C Element is removed from DOM

D Element is duplicated

💡 Hint

Refer to variable_tracker and execution_table steps where showShow changes to false.

Concept Snapshot

v-if conditionally adds/removes elements from the DOM.
v-show toggles element visibility using CSS display.
v-if is better for rare toggles.
v-show is better for frequent toggles.
v-show keeps element in DOM, affecting accessibility.
Use v-if to save resources when hidden.

Full Transcript

This visual execution compares v-if and v-show in Vue. v-if adds or removes elements from the DOM based on a condition, meaning the element does not exist in the DOM when the condition is false. v-show keeps the element always in the DOM but toggles its visibility by changing the CSS display property between 'block' and 'none'. The execution table shows four steps with different combinations of conditions for showIf and showShow variables. When showIf is false, the element controlled by v-if is removed from the DOM. When showShow is false, the element controlled by v-show remains in the DOM but is hidden by CSS. The variable tracker shows how these variables change over steps. Key moments clarify common confusions about DOM removal, toggling speed, and accessibility. The quiz tests understanding of these behaviors referencing the execution table and variable tracker. The snapshot summarizes the main differences and when to use each directive.