Nested routes and child views in Vue

Introduction

Nested routes let you show pages inside other pages. This helps organize your app and keep related views together.

You want a main page with smaller sections inside it, like a dashboard with tabs.

You have a profile page with subpages for settings, posts, and friends.

You want to keep your URL structure clear and show parts of the page that change inside a main layout.

You want to reuse a layout component and show different content inside it based on the route.

Syntax

Vue

const routes = [
  {
    path: '/parent',
    component: ParentComponent,
    children: [
      {
        path: 'child',
        component: ChildComponent
      }
    ]
  }
];

The children array holds nested routes inside a parent route.

Child paths do not start with a slash; they are relative to the parent path.

Examples

This example shows a dashboard with two child views: stats and settings.

Vue

const routes = [
  {
    path: '/dashboard',
    component: Dashboard,
    children: [
      { path: 'stats', component: Stats },
      { path: 'settings', component: Settings }
    ]
  }
];

An empty string '' as a child path means it shows by default when visiting the parent route.

Vue

const routes = [
  {
    path: '/profile',
    component: Profile,
    children: [
      { path: '', component: ProfileOverview },
      { path: 'posts', component: ProfilePosts }
    ]
  }
];

Sample Program

This Vue app shows a parent view with a nested child view. When you visit /parent/child, you see the child content inside the parent layout.

Vue

<template>
  <router-view />
</template>

<script setup>
import { createRouter, createWebHistory } from 'vue-router';
import { createApp } from 'vue';

const Parent = {
  template: `<div>
    <h2>Parent View</h2>
    <router-view />
  </div>`
};

const Child = {
  template: `<div><p>This is the child view inside the parent.</p></div>`
};

const routes = [
  {
    path: '/parent',
    component: Parent,
    children: [
      {
        path: 'child',
        component: Child
      }
    ]
  }
];

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

const app = createApp({});
app.use(router);
app.mount('#app');
</script>

Important Notes

Always include a <router-view /> in the parent component to show child views.

Child routes build on the parent path automatically, so no leading slash in child paths.

Use nested routes to keep your app organized and improve user experience with clear layouts.

Summary

Nested routes let you show smaller views inside bigger views.

Child routes go inside a children array in the parent route.

Use <router-view /> in parent components to display child views.

Practice

1. What is the main purpose of nested routes in Vue Router?

easy

A. To load multiple Vue apps on the same page

B. To display child views inside a parent view using <router-view />

C. To create routes without components

D. To disable navigation guards

Solution

1. Step 1: Understand nested routes concept

   Nested routes allow smaller views (child views) to be shown inside bigger views (parent views).

2. Step 2: Identify how child views are displayed

   Child views appear inside the parent component where <router-view /> is placed.

3. Final Answer:

   To display child views inside a parent view using <router-view /> -> Option B

4. Quick Check:

   Nested routes = child views inside parent with <router-view /> [OK]

Hint: Nested routes show child views inside parents with [OK]

Common Mistakes:

• Thinking nested routes load separate apps
• Believing nested routes don't need
• Confusing nested routes with route guards

2. Which of the following is the correct way to define a child route inside a parent route in Vue Router?

easy

A. { path: '/parent', component: Parent, children: [{ path: 'child', component: Child }] }

B. { path: '/parent/child', component: Child }

C. { path: '/parent', component: Parent, child: [{ path: 'child', component: Child }] }

D. { path: '/parent', component: Parent, children: { path: 'child', component: Child } }

Solution

1. Step 1: Recall Vue Router child route syntax

   Child routes go inside a children array property of the parent route object.

2. Step 2: Check each option's structure

   { path: '/parent', component: Parent, children: [{ path: 'child', component: Child }] } correctly uses children: [{ path: 'child', component: Child }]. Options C and D use wrong keys or types. { path: '/parent/child', component: Child } defines a separate route, not nested.

3. Final Answer:

   { path: '/parent', component: Parent, children: [{ path: 'child', component: Child }] } -> Option A

4. Quick Check:

   Child routes = inside children array [OK]

Hint: Child routes go inside a children array in parent route [OK]

Common Mistakes:

• Using 'child' instead of 'children' key
• Defining child routes outside parent route
• Using object instead of array for children

3. Given this route config and components, what will be rendered when navigating to /dashboard/settings?

const routes = [
  { path: '/dashboard', component: Dashboard, children: [
    { path: 'settings', component: Settings }
  ]}
];

// Dashboard.vue template:
// 
Dashboard

// Settings.vue template:
// 
Settings Page

medium

A. Nothing renders due to missing

B. Settings Page

C. DashboardSettings Page

D. Dashboard

Solution

1. Step 1: Understand nested route rendering

   When visiting '/dashboard/settings', Vue renders Dashboard component first, then inside its <router-view /> renders Settings component.

2. Step 2: Combine rendered HTML from both components

   Dashboard shows <h1>Dashboard</h1> and Settings shows <h2>Settings Page</h2>. Both appear together.

3. Final Answer:

   <h1>Dashboard</h1><h2>Settings Page</h2> -> Option C

4. Quick Check:

   Nested route renders parent + child views [OK]

Hint: Nested routes render parent plus child inside [OK]

Common Mistakes:

• Expecting only child component to render
• Forgetting in parent
• Confusing full path with child path

4. What is wrong with this route configuration if child views do not appear?

const routes = [
  { path: '/profile', component: Profile, children: [
    { path: 'edit', component: EditProfile }
  ]}
];

// Profile.vue template:
// 
Profile Page

medium

A. Profile.vue is missing to display child routes

B. Child route path should start with '/'

C. Children array should be outside the parent route object

D. EditProfile component must be imported inside Profile.vue

Solution

1. Step 1: Check how child routes display

   Child routes render inside the parent's <router-view />. Without it, child views won't show.

2. Step 2: Inspect Profile.vue template

   Profile.vue only has <h1>Profile Page</h1> and no <router-view />, so child routes can't render.

3. Final Answer:

   Profile.vue is missing <router-view /> to display child routes -> Option A

4. Quick Check:

   Missing <router-view /> = no child views [OK]

Hint: Parent needs to show child routes [OK]

Common Mistakes:

• Adding '/' at start of child path incorrectly
• Placing children outside parent route object
• Assuming child component imports affect rendering

5. You want to create a nested route where /shop shows a Shop component and /shop/products shows a Products component inside Shop. Which setup correctly achieves this and ensures accessibility and responsiveness? A) Define routes with children array, use <router-view /> in Shop, and add ARIA roles and responsive CSS. B) Define separate routes for /shop and /shop/products without nesting, and use CSS media queries only. C) Use nested routes but omit <router-view /> in Shop and rely on v-if to show Products. D) Use nested routes with children but place <router-view /> outside Shop component.

hard

A. Use nested routes but place outside Shop component

B. Define separate routes without nesting and use only CSS media queries

C. Use nested routes but omit in Shop and use v-if for Products

D. Define routes with children array, use in Shop, add ARIA roles and responsive CSS

Solution

1. Step 1: Setup nested routes properly

   Use a children array in the /shop route to define /shop/products as a child route.

2. Step 2: Ensure Shop component includes <router-view />

   This allows Products component to render inside Shop when navigating to /shop/products.

3. Step 3: Add accessibility and responsiveness

   Use ARIA roles for landmarks and semantic HTML, plus responsive CSS (like Flexbox or Grid) to adapt layout on different screens.

4. Final Answer:

   Define routes with children array, use <router-view /> in Shop, add ARIA roles and responsive CSS -> Option D

5. Quick Check:

   Nested routes + router-view + accessibility + responsive CSS = Define routes with children array, use in Shop, add ARIA roles and responsive CSS [OK]

Hint: Nested routes need router-view in parent plus ARIA and responsive CSS [OK]

Common Mistakes:

• Omitting router-view in parent component
• Not adding ARIA roles for accessibility
• Ignoring responsive design in CSS
• Placing router-view outside parent component