Vue.js • Chapter 35 • Foundations to Advanced
Vue Router Fundamentals
Each topic includes substantial explanation, ten focused examples, its own Vue code example, step-by-step reasoning, expected behavior, and practice.
35.1 Creating a Router
Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to Creating a Router and trace how it changes the rendered interface. In Chapter 35, trace the value or control flow from its source to the rendered interface so you can explain why Vue changes the screen.
For Creating a Router in Chapter 35, inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Keep writable state ownership explicit, derive values when possible, and separate display calculations from network, DOM, storage, timer, or other external work.
This lesson connects Creating a Router to vue router fundamentals. Start with one working case, verify the expected output, then add one edge case and explain what Vue tracks, reuses, creates, removes, or updates.
Concept in plain language
Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to Creating a Router and trace how it changes the rendered interface.
10 teaching examples
Example 1: Smallest useful case
Build the smallest analytics view that demonstrates Creating a Router. Keep one input and one visible result, then explain URL state, route parameters, matched records, navigation lifecycle, and failure states. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to Creating a Router and trace how it changes the rendered interface. This is example 1 for Chapter 35, topic 1.
Example 2: Change one reactive value
Change one value involved in Creating a Router inside the support form. Predict what Vue will update before running it, then compare the prediction with the rendered result.
Example 3: Parent-child comparison
Use Creating a Router across two components in the course dashboard. Compare which component owns the writable data and which component only receives or presents it.
Example 4: Edge case
Add an empty, missing, invalid, delayed, or rapidly changing value to the profile editor. Handle the Creating a Router edge case explicitly instead of leaving stale output.
Example 5: Accessibility review
Use Creating a Router in the search panel while checking semantic HTML, labels, focus order, keyboard access, and understandable status feedback. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to Creating a Router and trace how it changes the rendered interface. This is example 5 for Chapter 35, topic 1.
Example 6: State ownership review
Remove duplicated state from the shopping cart. For Creating a Router, derive values when possible and keep the writable source with the component or store that owns it.
Example 7: Slow-network scenario
Assume the lesson tracker has a slow request while using Creating a Router. Decide what remains interactive, what shows pending feedback, and how stale responses are prevented.
Example 8: Refactoring exercise
Extract the Creating a Router responsibility from a crowded booking form into a focused component or composable with a narrow API.
Example 9: Performance experiment
Measure the message panel before optimizing Creating a Router. Check reactive work, repeated calculations, list size, component updates, and user-visible delay.
Example 10: Production review
Review Creating a Router in the admin table for errors, security, localization, RTL, narrow screens, accessibility, and what monitoring should report. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to Creating a Router and trace how it changes the rendered interface. This is example 10 for Chapter 35, topic 1.
Vue code example
<script setup>
import { useRoute, useRouter } from 'vue-router'
const route = useRoute()
const router = useRouter()
function goHome(){ router.push('/') }
</script>
<template><p>Route: {{ route.fullPath }}</p><button @click="goHome">Home</button></template>Step-by-step code explanation
- Identify the Vue responsibility demonstrated by Creating a Router.
- Read the reactive state, props, route/store input, or injected value before the template.
- Trace the event, dependency, watcher, lifecycle hook, or navigation action that changes the display.
- Test one normal path and one edge case, including cleanup when external work is involved.
- Confirm accessibility, mobile width, and RTL behavior for user-facing controls and translated text.
Expected behavior: A small Vue interface demonstrates Creating a Router and updates according to the interaction or data in the example.
Practice exercise
Create a small Vue feature focused on Creating a Router from Chapter 35. Predict the result before running it, test one edge case, and explain which reactive value, prop, event, route, store, or lifecycle step caused the update. Then check accessibility, narrow-screen width, and RTL behavior where relevant.
35.2 Route Records
Route Records is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. In Chapter 35, trace the value or control flow from its source to the rendered interface so you can explain why Vue changes the screen.
For Route Records in Chapter 35, inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Keep writable state ownership explicit, derive values when possible, and separate display calculations from network, DOM, storage, timer, or other external work.
This lesson connects Route Records to vue router fundamentals. Start with one working case, verify the expected output, then add one edge case and explain what Vue tracks, reuses, creates, removes, or updates.
Concept in plain language
Route Records is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements.
10 teaching examples
Example 1: Smallest useful case
Build the smallest profile editor that demonstrates Route Records. Keep one input and one visible result, then explain URL state, route parameters, matched records, navigation lifecycle, and failure states. Route Records is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. This is example 1 for Chapter 35, topic 2.
Example 2: Change one reactive value
Change one value involved in Route Records inside the search panel. Predict what Vue will update before running it, then compare the prediction with the rendered result.
Example 3: Parent-child comparison
Use Route Records across two components in the shopping cart. Compare which component owns the writable data and which component only receives or presents it.
Example 4: Edge case
Add an empty, missing, invalid, delayed, or rapidly changing value to the lesson tracker. Handle the Route Records edge case explicitly instead of leaving stale output.
Example 5: Accessibility review
Use Route Records in the booking form while checking semantic HTML, labels, focus order, keyboard access, and understandable status feedback. Route Records is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. This is example 5 for Chapter 35, topic 2.
Example 6: State ownership review
Remove duplicated state from the message panel. For Route Records, derive values when possible and keep the writable source with the component or store that owns it.
Example 7: Slow-network scenario
Assume the admin table has a slow request while using Route Records. Decide what remains interactive, what shows pending feedback, and how stale responses are prevented.
Example 8: Refactoring exercise
Extract the Route Records responsibility from a crowded photo gallery into a focused component or composable with a narrow API.
Example 9: Performance experiment
Measure the notification center before optimizing Route Records. Check reactive work, repeated calculations, list size, component updates, and user-visible delay.
Example 10: Production review
Review Route Records in the task board for errors, security, localization, RTL, narrow screens, accessibility, and what monitoring should report. Route Records is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. This is example 10 for Chapter 35, topic 2.
Vue code example
<script setup>
import { useRoute, useRouter } from 'vue-router'
const route = useRoute()
const router = useRouter()
function goHome(){ router.push('/') }
</script>
<template><p>Route: {{ route.fullPath }}</p><button @click="goHome">Home</button></template>Step-by-step code explanation
- Identify the Vue responsibility demonstrated by Route Records.
- Read the reactive state, props, route/store input, or injected value before the template.
- Trace the event, dependency, watcher, lifecycle hook, or navigation action that changes the display.
- Test one normal path and one edge case, including cleanup when external work is involved.
- Confirm accessibility, mobile width, and RTL behavior for user-facing controls and translated text.
Expected behavior: A small Vue interface demonstrates Route Records and updates according to the interaction or data in the example.
Practice exercise
Create a small Vue feature focused on Route Records from Chapter 35. Predict the result before running it, test one edge case, and explain which reactive value, prop, event, route, store, or lifecycle step caused the update. Then check accessibility, narrow-screen width, and RTL behavior where relevant.
35.3 RouterView
Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterView and trace how it changes the rendered interface. In Chapter 35, trace the value or control flow from its source to the rendered interface so you can explain why Vue changes the screen.
For RouterView in Chapter 35, inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Keep writable state ownership explicit, derive values when possible, and separate display calculations from network, DOM, storage, timer, or other external work.
This lesson connects RouterView to vue router fundamentals. Start with one working case, verify the expected output, then add one edge case and explain what Vue tracks, reuses, creates, removes, or updates.
Concept in plain language
Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterView and trace how it changes the rendered interface.
10 teaching examples
Example 1: Smallest useful case
Build the smallest lesson tracker that demonstrates RouterView. Keep one input and one visible result, then explain URL state, route parameters, matched records, navigation lifecycle, and failure states. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterView and trace how it changes the rendered interface. This is example 1 for Chapter 35, topic 3.
Example 2: Change one reactive value
Change one value involved in RouterView inside the booking form. Predict what Vue will update before running it, then compare the prediction with the rendered result.
Example 3: Parent-child comparison
Use RouterView across two components in the message panel. Compare which component owns the writable data and which component only receives or presents it.
Example 4: Edge case
Add an empty, missing, invalid, delayed, or rapidly changing value to the admin table. Handle the RouterView edge case explicitly instead of leaving stale output.
Example 5: Accessibility review
Use RouterView in the photo gallery while checking semantic HTML, labels, focus order, keyboard access, and understandable status feedback. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterView and trace how it changes the rendered interface. This is example 5 for Chapter 35, topic 3.
Example 6: State ownership review
Remove duplicated state from the notification center. For RouterView, derive values when possible and keep the writable source with the component or store that owns it.
Example 7: Slow-network scenario
Assume the task board has a slow request while using RouterView. Decide what remains interactive, what shows pending feedback, and how stale responses are prevented.
Example 8: Refactoring exercise
Extract the RouterView responsibility from a crowded language selector into a focused component or composable with a narrow API.
Example 9: Performance experiment
Measure the quiz screen before optimizing RouterView. Check reactive work, repeated calculations, list size, component updates, and user-visible delay.
Example 10: Production review
Review RouterView in the analytics view for errors, security, localization, RTL, narrow screens, accessibility, and what monitoring should report. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterView and trace how it changes the rendered interface. This is example 10 for Chapter 35, topic 3.
Vue code example
<script setup>
import { useRoute, useRouter } from 'vue-router'
const route = useRoute()
const router = useRouter()
function goHome(){ router.push('/') }
</script>
<template><p>Route: {{ route.fullPath }}</p><button @click="goHome">Home</button></template>Step-by-step code explanation
- Identify the Vue responsibility demonstrated by RouterView.
- Read the reactive state, props, route/store input, or injected value before the template.
- Trace the event, dependency, watcher, lifecycle hook, or navigation action that changes the display.
- Test one normal path and one edge case, including cleanup when external work is involved.
- Confirm accessibility, mobile width, and RTL behavior for user-facing controls and translated text.
Expected behavior: A small Vue interface demonstrates RouterView and updates according to the interaction or data in the example.
Practice exercise
Create a small Vue feature focused on RouterView from Chapter 35. Predict the result before running it, test one edge case, and explain which reactive value, prop, event, route, store, or lifecycle step caused the update. Then check accessibility, narrow-screen width, and RTL behavior where relevant.
35.4 RouterLink
Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterLink and trace how it changes the rendered interface. In Chapter 35, trace the value or control flow from its source to the rendered interface so you can explain why Vue changes the screen.
For RouterLink in Chapter 35, inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Keep writable state ownership explicit, derive values when possible, and separate display calculations from network, DOM, storage, timer, or other external work.
This lesson connects RouterLink to vue router fundamentals. Start with one working case, verify the expected output, then add one edge case and explain what Vue tracks, reuses, creates, removes, or updates.
Concept in plain language
Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterLink and trace how it changes the rendered interface.
10 teaching examples
Example 1: Smallest useful case
Build the smallest admin table that demonstrates RouterLink. Keep one input and one visible result, then explain URL state, route parameters, matched records, navigation lifecycle, and failure states. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterLink and trace how it changes the rendered interface. This is example 1 for Chapter 35, topic 4.
Example 2: Change one reactive value
Change one value involved in RouterLink inside the photo gallery. Predict what Vue will update before running it, then compare the prediction with the rendered result.
Example 3: Parent-child comparison
Use RouterLink across two components in the notification center. Compare which component owns the writable data and which component only receives or presents it.
Example 4: Edge case
Add an empty, missing, invalid, delayed, or rapidly changing value to the task board. Handle the RouterLink edge case explicitly instead of leaving stale output.
Example 5: Accessibility review
Use RouterLink in the language selector while checking semantic HTML, labels, focus order, keyboard access, and understandable status feedback. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterLink and trace how it changes the rendered interface. This is example 5 for Chapter 35, topic 4.
Example 6: State ownership review
Remove duplicated state from the quiz screen. For RouterLink, derive values when possible and keep the writable source with the component or store that owns it.
Example 7: Slow-network scenario
Assume the analytics view has a slow request while using RouterLink. Decide what remains interactive, what shows pending feedback, and how stale responses are prevented.
Example 8: Refactoring exercise
Extract the RouterLink responsibility from a crowded support form into a focused component or composable with a narrow API.
Example 9: Performance experiment
Measure the course dashboard before optimizing RouterLink. Check reactive work, repeated calculations, list size, component updates, and user-visible delay.
Example 10: Production review
Review RouterLink in the profile editor for errors, security, localization, RTL, narrow screens, accessibility, and what monitoring should report. Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterLink and trace how it changes the rendered interface. This is example 10 for Chapter 35, topic 4.
Vue code example
<script setup>
import { useRoute, useRouter } from 'vue-router'
const route = useRoute()
const router = useRouter()
function goHome(){ router.push('/') }
</script>
<template><p>Route: {{ route.fullPath }}</p><button @click="goHome">Home</button></template>Step-by-step code explanation
- Identify the Vue responsibility demonstrated by RouterLink.
- Read the reactive state, props, route/store input, or injected value before the template.
- Trace the event, dependency, watcher, lifecycle hook, or navigation action that changes the display.
- Test one normal path and one edge case, including cleanup when external work is involved.
- Confirm accessibility, mobile width, and RTL behavior for user-facing controls and translated text.
Expected behavior: A small Vue interface demonstrates RouterLink and updates according to the interaction or data in the example.
Practice exercise
Create a small Vue feature focused on RouterLink from Chapter 35. Predict the result before running it, test one edge case, and explain which reactive value, prop, event, route, store, or lifecycle step caused the update. Then check accessibility, narrow-screen width, and RTL behavior where relevant.
35.5 History Modes
History Modes is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. In Chapter 35, trace the value or control flow from its source to the rendered interface so you can explain why Vue changes the screen.
For History Modes in Chapter 35, inspect reactive inputs, component ownership, rendered output, edge cases, and what causes another update. Keep writable state ownership explicit, derive values when possible, and separate display calculations from network, DOM, storage, timer, or other external work.
This lesson connects History Modes to vue router fundamentals. Start with one working case, verify the expected output, then add one edge case and explain what Vue tracks, reuses, creates, removes, or updates.
Concept in plain language
History Modes is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements.
10 teaching examples
Example 1: Smallest useful case
Build the smallest task board that demonstrates History Modes. Keep one input and one visible result, then explain reactive inputs, component ownership, rendered output, edge cases, and what causes another update. History Modes is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. This is example 1 for Chapter 35, topic 5.
Example 2: Change one reactive value
Change one value involved in History Modes inside the language selector. Predict what Vue will update before running it, then compare the prediction with the rendered result.
Example 3: Parent-child comparison
Use History Modes across two components in the quiz screen. Compare which component owns the writable data and which component only receives or presents it.
Example 4: Edge case
Add an empty, missing, invalid, delayed, or rapidly changing value to the analytics view. Handle the History Modes edge case explicitly instead of leaving stale output.
Example 5: Accessibility review
Use History Modes in the support form while checking semantic HTML, labels, focus order, keyboard access, and understandable status feedback. History Modes is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. This is example 5 for Chapter 35, topic 5.
Example 6: State ownership review
Remove duplicated state from the course dashboard. For History Modes, derive values when possible and keep the writable source with the component or store that owns it.
Example 7: Slow-network scenario
Assume the profile editor has a slow request while using History Modes. Decide what remains interactive, what shows pending feedback, and how stale responses are prevented.
Example 8: Refactoring exercise
Extract the History Modes responsibility from a crowded search panel into a focused component or composable with a narrow API.
Example 9: Performance experiment
Measure the shopping cart before optimizing History Modes. Check reactive work, repeated calculations, list size, component updates, and user-visible delay.
Example 10: Production review
Review History Modes in the lesson tracker for errors, security, localization, RTL, narrow screens, accessibility, and what monitoring should report. History Modes is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements. This is example 10 for Chapter 35, topic 5.
Vue code example
<script setup>
import { useRoute, useRouter } from 'vue-router'
const route = useRoute()
const router = useRouter()
function goHome(){ router.push('/') }
</script>
<template><p>Route: {{ route.fullPath }}</p><button @click="goHome">Home</button></template>Step-by-step code explanation
- Identify the Vue responsibility demonstrated by History Modes.
- Read the reactive state, props, route/store input, or injected value before the template.
- Trace the event, dependency, watcher, lifecycle hook, or navigation action that changes the display.
- Test one normal path and one edge case, including cleanup when external work is involved.
- Confirm accessibility, mobile width, and RTL behavior for user-facing controls and translated text.
Expected behavior: A small Vue interface demonstrates History Modes and updates according to the interaction or data in the example.
Practice exercise
Create a small Vue feature focused on History Modes from Chapter 35. Predict the result before running it, test one edge case, and explain which reactive value, prop, event, route, store, or lifecycle step caused the update. Then check accessibility, narrow-screen width, and RTL behavior where relevant.
Chapter 35 review — 10 questions and answers
1. What is the purpose of Creating a Router?
Answer: Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to Creating a Router and trace how it changes the rendered interface.
2. What should you inspect when Creating a Router behaves unexpectedly?
Answer: Inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Reduce the feature to a small component and trace reactive input through the rendered result.
3. What is the purpose of Route Records?
Answer: Route Records is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements.
4. What should you inspect when Route Records behaves unexpectedly?
Answer: Inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Reduce the feature to a small component and trace reactive input through the rendered result.
5. What is the purpose of RouterView?
Answer: Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterView and trace how it changes the rendered interface.
6. What should you inspect when RouterView behaves unexpectedly?
Answer: Inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Reduce the feature to a small component and trace reactive input through the rendered result.
7. What is the purpose of RouterLink?
Answer: Vue Router maps application URLs to component views and supplies navigation APIs. In Chapter 35, apply this definition specifically to RouterLink and trace how it changes the rendered interface.
8. What should you inspect when RouterLink behaves unexpectedly?
Answer: Inspect URL state, route parameters, matched records, navigation lifecycle, and failure states. Reduce the feature to a small component and trace reactive input through the rendered result.
9. What is the purpose of History Modes?
Answer: History Modes is a focused part of Vue application design in Chapter 35. Study its inputs, reactive dependencies, component ownership, rendered result, edge cases, and cleanup requirements.
10. What should you inspect when History Modes behaves unexpectedly?
Answer: Inspect reactive inputs, component ownership, rendered output, edge cases, and what causes another update. Reduce the feature to a small component and trace reactive input through the rendered result.