Vue Router installation and setup - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Vue Router used for in a Vue.js application?

Vue Router helps you create different pages or views in your Vue app and lets users move between them without reloading the page.

beginner

How do you install Vue Router in a Vue 3 project?

You run npm install vue-router@4 or yarn add vue-router@4 to add Vue Router version 4, which works with Vue 3.

intermediate

What is the purpose of createRouter and createWebHistory in Vue Router setup?

createRouter creates the router instance that controls navigation. createWebHistory tells the router to use browser history mode for clean URLs without hashes.

beginner

Where do you add the router to your Vue app?

You add the router to your app by calling app.use(router) before mounting the app with app.mount('#app').

beginner

What component do you use in your template to display the matched route's component?

You use the <router-view> component in your template. It shows the component for the current route.

Which command installs Vue Router version 4 for Vue 3?

A npm install vue-router@4

B npm install vue-router@3

C npm install vue-router

D npm install vue-router@5

Vue Router version 4 is designed for Vue 3, so you install it with npm install vue-router@4.

What does createWebHistory() do in Vue Router?

A Enables hash-based URLs

B Defines routes

C Enables browser history mode for clean URLs

D Creates a new Vue app

createWebHistory() uses the browser's history API to create clean URLs without hashes.

Where should you place app.use(router) in your Vue app setup?

A After mounting the app

B In the main component's template

C Inside the router file

D Before mounting the app

You must add the router to the app with app.use(router) before calling app.mount().

Which component renders the matched route's component in Vue Router?

A <router-link>

B <router-view>

C <router-route>

D <router-display>

is the placeholder where the current route's component is displayed.

What is the first step after installing Vue Router to set it up?

A Create a router instance with routes

B Add <router-view> in HTML

C Call app.mount()

D Write components

After installing, you create a router instance with your route definitions using createRouter.

Explain the steps to install and set up Vue Router in a new Vue 3 project.

Think about installation, router creation, app integration, and template usage.

Describe the role of and how it works with Vue Router.

Focus on how Vue Router shows different pages inside your app.

Practice

1. What is the main purpose of Vue Router in a Vue application?

easy

A. To manage navigation between different pages or views

B. To style components with CSS

C. To handle data fetching from APIs

D. To compile Vue components into JavaScript

Solution

1. Step 1: Understand Vue Router's role

   Vue Router is designed to help Vue apps navigate between different pages or views smoothly.

2. Step 2: Compare with other options

   Styling, data fetching, and compiling are handled by other tools, not Vue Router.

3. Final Answer:

   To manage navigation between different pages or views -> Option A

4. Quick Check:

   Vue Router = Navigation [OK]

Hint: Vue Router controls page navigation in Vue apps [OK]

Common Mistakes:

• Confusing Vue Router with styling or data fetching tools
• Thinking Vue Router compiles components
• Assuming Vue Router manages state

2. Which of the following is the correct way to install Vue Router in a Vue 3 project using npm?

easy

A. npm install vue-router@3

B. npm install vue-router@4

C. npm install vue-router@2

D. npm install vue-router@5

Solution

1. Step 1: Identify Vue Router version for Vue 3

   Vue 3 uses Vue Router version 4, so you must install vue-router@4.

2. Step 2: Check other versions

   Versions 2 and 3 are for Vue 2 or earlier, and version 5 does not exist yet.

3. Final Answer:

   npm install vue-router@4 -> Option B

4. Quick Check:

   Vue 3 uses Vue Router 4 [OK]

Hint: Vue 3 pairs with vue-router version 4 [OK]

Common Mistakes:

• Installing older Vue Router versions for Vue 3
• Using a non-existent version number
• Forgetting to specify version for compatibility

3. Given this Vue Router setup code, what will be the rendered output when navigating to '/about'?

import { createRouter, createWebHistory } from 'vue-router';
import Home from './components/Home.vue';
import About from './components/About.vue';

const routes = [
  { path: '/', component: Home },
  { path: '/about', component: About }
];

const router = createRouter({
  history: createWebHistory(),
  routes
});

export default router;

And in App.vue template:

<router-view />

medium

A. The Home component content is shown

B. An error occurs because routes are missing

C. Nothing is shown because router is not used

D. The About component content is shown

Solution

1. Step 1: Understand route matching

   When the URL is '/about', Vue Router matches the route with path '/about' and renders the About component.

2. Step 2: Check router-view usage

   The <router-view /> in App.vue displays the matched component, so About content appears.

3. Final Answer:

   The About component content is shown -> Option D

4. Quick Check:

   URL '/about' shows About component [OK]

Hint: URL path matches route, router-view shows that component [OK]

Common Mistakes:

• Assuming Home shows for all paths
• Forgetting router-view renders matched component
• Thinking router must be manually mounted in template

4. What is wrong with this Vue Router setup code?

import { createRouter, createWebHistory } from 'vue-router';
import Home from './components/Home.vue';
import Contact from './components/Contact.vue';

const routes = [
  { path: '/', component: Home },
  { path: '/contact', component: Contact }
];

const router = createRouter({
  history: createWebHistory,
  routes
});

export default router;

medium

A. Components Home and Contact are not imported

B. Routes array is empty

C. createWebHistory is missing parentheses when used

D. Router is not created with createRouter function

Solution

1. Step 1: Check createWebHistory usage

   createWebHistory is a function and must be called with parentheses: createWebHistory()

2. Step 2: Verify other parts

   Routes are defined with imported components, router is created correctly.

3. Final Answer:

   createWebHistory is missing parentheses when used -> Option C

4. Quick Check:

   Functions need parentheses to execute [OK]

Hint: Call createWebHistory() with () to avoid errors [OK]

Common Mistakes:

• Forgetting parentheses on createWebHistory
• Believing routes array is empty
• Misnaming createRouter function

5. You want to add a navigation menu with links to Home and About pages using Vue Router. Which template code correctly uses Vue Router components for navigation?

hard

A.
Home
About

B.
Home
About

C.
Home
About

D.
Home
About

Solution

1. Step 1: Use correct attribute for router-link

   The correct attribute to specify the route path is 'to', not 'href'.

2. Step 2: Use correct path format

   Paths must start with '/', so '/about' is correct, while 'about' without slash is incorrect.

3. Final Answer:

   Use <router-link to="/"> and <router-link to="/about"> with router-view -> Option A

4. Quick Check:

   router-link uses 'to' with leading slash paths [OK]

Hint: Use 'to' attribute with leading slash in router-link [OK]

Common Mistakes:

• Using 'href' instead of 'to' in router-link
• Omitting leading slash in paths
• Using plain anchor tags instead of router-link