Route parameters with useRoute in Vue - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the useRoute function from Vue Router.

Vue

import { [1] } from 'vue-router';

Drag options to blanks, or click blank then click option'

AuseRoute

BuseRouter

CuseRouteParams

DuseRouterParams

Attempts:

3 left

💡 Hint

Common Mistakes

Importing useRouter instead of useRoute

Using a non-existent function like useRouteParams

The useRoute function is imported from vue-router to access the current route's information.

2fill in blank

medium

Complete the code to get the current route object inside the setup function.

Vue

const route = [1]();

Drag options to blanks, or click blank then click option'

AuseRouter

BuseRouteParams

CgetCurrentRoute

DuseRoute

Attempts:

3 left

💡 Hint

Common Mistakes

Calling useRouter() instead of useRoute()

Trying to call a non-existent function getCurrentRoute()

Calling useRoute() inside setup() returns the current route object.

3fill in blank

hard

Fix the error in accessing the route parameter named 'id'.

Vue

const userId = route.params.[1];

Drag options to blanks, or click blank then click option'

Aid

Bparams

CuserId

DrouteId

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong parameter name like 'userId' instead of 'id'

Trying to access route.params.params

Route parameters are accessed by their name, here 'id', inside route.params.

4fill in blank

hard

Fill both blanks to create a reactive computed property that returns the 'id' parameter as a number.

Vue

import { computed } from 'vue';
const route = useRoute();
const userId = computed(() => Number(route.params.[1]));

console.log(userId.[2]);

Drag options to blanks, or click blank then click option'

Aid

Bvalue

Cparams

Did.value

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'params' instead of 'id' for the parameter

Trying to access computed property without '.value'

The parameter name is 'id'. The computed property value is accessed with .value.

5fill in blank

hard

Fill all three blanks to create a Vue component that displays the route 'id' parameter reactively.

Vue

<script setup>
import { [1] } from 'vue';
import { useRoute } from 'vue-router';

const route = useRoute();
const userId = [2](() => route.params.[3]);
</script>

<template>
  <p>User ID: {{ userId }}</p>
</template>

Drag options to blanks, or click blank then click option'

Acomputed

Bref

Cid

Dparams

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ref' instead of 'computed' for a derived reactive value

Using 'params' instead of 'id' as the parameter name

We import computed from Vue, use it to create a reactive property, and access the 'id' parameter.

Practice

1. What does the useRoute function in Vue Router allow you to do inside a component?

easy

A. Access the current route's parameters and information

B. Change the URL path programmatically

C. Register a new route dynamically

D. Navigate to a different route without reloading

Solution

1. Step 1: Understand the purpose of useRoute

   useRoute is a Vue Router composable that provides access to the current route object inside a component.

2. Step 2: Identify what can be accessed with useRoute

   It allows reading route parameters, query, name, and path but does not change routes or register them.

3. Final Answer:

   Access the current route's parameters and information -> Option A

4. Quick Check:

   useRoute reads route info = B [OK]

Hint: useRoute reads route info, doesn't change or register routes [OK]

Common Mistakes:

• Thinking useRoute changes routes
• Confusing useRoute with useRouter
• Assuming useRoute registers routes

2. Which of the following is the correct way to import and use useRoute in a Vue 3 component's setup() function?

easy

A. import { useRoute } from 'vue-router'; const route = useRoute(route);

B. import useRoute from 'vue-router'; const route = useRoute();

C. import { useRoute } from 'vue-router'; const route = useRoute();

D. import { useRoute } from 'vue'; const route = useRoute();

Solution

1. Step 1: Check the import source

   useRoute is exported from 'vue-router', so import must be from 'vue-router'.

2. Step 2: Verify usage syntax

   The correct usage is calling useRoute() without arguments to get the current route object.

3. Final Answer:

   import { useRoute } from 'vue-router'; const route = useRoute(); -> Option C

4. Quick Check:

   Correct import and call = D [OK]

Hint: Import from 'vue-router' and call useRoute() with no arguments [OK]

Common Mistakes:

• Importing from 'vue' instead of 'vue-router'
• Calling useRoute with arguments
• Using default import instead of named import

3. Given this Vue 3 component code snippet, what will be logged when the URL is /user/42 and the route is defined as /user/:id?

import { useRoute } from 'vue-router';
import { onMounted } from 'vue';

export default {
  setup() {
    const route = useRoute();
    onMounted(() => {
      console.log(route.params.id);
    });
  }
}

medium

A. null

B. undefined

C. user

D. 42

Solution

1. Step 1: Identify the route parameter

   The route is defined as /user/:id, so id is a parameter expected in route.params.

2. Step 2: Check the URL and logged value

   The URL is /user/42, so route.params.id will be "42". The console logs this value on mount.

3. Final Answer:

   42 -> Option D

4. Quick Check:

   route.params.id = "42" [OK]

Hint: Route param matches URL segment after colon :id [OK]

Common Mistakes:

• Expecting param name instead of value
• Confusing params with query
• Logging before route is ready

4. What is the main issue with this Vue 3 component code that tries to react to route parameter changes?

import { useRoute } from 'vue-router';
import { computed } from 'vue';

export default {
  setup() {
    const route = useRoute();
    const userId = computed(() => route.params.id);
    return { userId };
  }
}

The component does not update userId when the route changes.

medium

A. The route object is not reactive, so computed won't update

B. The computed function is missing a dependency array

C. The useRoute hook must be called inside onMounted

D. The userId should be a ref, not computed

Solution

1. Step 1: Understand reactivity of route

   The route object returned by useRoute() is reactive, but its params property is not deeply reactive by default.

2. Step 2: Why computed does not update

   Because route.params is not reactive, the computed property does not track changes, so userId stays the same.

3. Final Answer:

   The route object is not reactive, so computed won't update -> Option A

4. Quick Check:

   Route params not reactive = A [OK]

Hint: Route params are not deeply reactive; watch route.fullPath instead [OK]

Common Mistakes:

• Assuming route.params is reactive
• Calling useRoute inside lifecycle hooks
• Using ref instead of computed incorrectly

5. You want to create a Vue 3 component that displays the user ID from the route parameter and updates automatically when the route changes. Which approach correctly achieves this?

import { useRoute } from 'vue-router';
import { computed, watch, ref } from 'vue';

export default {
  setup() {
    const route = useRoute();
    // What should userId be?
    const userId = ???
    return { userId };
  }
}

hard

A. computed(() => route.params.id)

B. computed(() => route.params.id) with a watch on route.fullPath to trigger updates

C. computed(() => route.fullPath.split('/')[2])

D. ref(route.params.id) without any watcher

Solution

1. Step 1: Understand reactivity limitations

   Route params are not deeply reactive, so computed(() => route.params.id) alone won't update when params change.

2. Step 2: Use a watch on route.fullPath to trigger updates

   Watching route.fullPath (which is reactive) and recomputing userId ensures updates when the route changes.

3. Final Answer:

   computed(() => route.params.id) with a watch on route.fullPath to trigger updates -> Option B

4. Quick Check:

   Watch route.fullPath for param changes = C [OK]

Hint: Watch route.fullPath to react to param changes in computed [OK]

Common Mistakes:

• Using computed alone without watch
• Parsing fullPath manually without reactivity
• Using ref without updating on route change