Named slots and scoped slots in Vue - Mini Project: Build & Apply

Using Named Slots and Scoped Slots in Vue

📖 Scenario: You are building a simple card component in Vue that can display different content in its header and footer areas. You want to use named slots so users can put custom content in these areas. Also, you want to pass some data from the card to the slot content using scoped slots.

🎯 Goal: Create a Vue component called BaseCard that uses named slots for header and footer. Pass a title string from the component to the header slot using a scoped slot. Then use BaseCard in an app and provide custom content for the named slots.

📋 What You'll Learn

Create a Vue component named BaseCard with a title prop set to 'Welcome'.

Inside BaseCard, define named slots called header and footer.

Pass the title prop to the header slot as a scoped slot property.

Use BaseCard in the main app and provide custom content for the header and footer slots.

In the header slot content, display the passed title property.

💡 Why This Matters

🌍 Real World

Named and scoped slots let you build flexible UI components that can be customized by users without changing the component code.

💼 Career

Understanding slots is essential for Vue developers to create reusable components and collaborate on large projects.

1

Create the BaseCard component with a title prop

Create a Vue component called BaseCard with a props option that defines a title prop with the default value 'Welcome'.

Vue

// Create BaseCard component with a title prop
export default {
  name: 'BaseCard',
  props: {
    // Your code here
  }
}

Hint

Use props: { title: { type: String, default: 'Welcome' } } inside the component.

2

Add named slots for header and footer in BaseCard template

Add a template section to BaseCard with a <div> container. Inside it, add two named slots: one named header and one named footer. Use <slot name="header"></slot> and <slot name="footer"></slot>.

Vue

export default {
  name: 'BaseCard',
  props: {
    title: {
      type: String,
      default: 'Welcome'
    }
  },
  template: `
    
      
    
  `
}

Hint

Use <slot name="header"></slot> and <slot name="footer"></slot> inside the template.

3

Pass the title prop to the header slot as a scoped slot

Modify the header slot in BaseCard to pass the title prop as a scoped slot property named title. Use <slot name="header" :title="title"></slot>.

Vue

export default {
  name: 'BaseCard',
  props: {
    title: {
      type: String,
      default: 'Welcome'
    }
  },
  template: `
    
      
      
      
    
  `
}

Hint

Add :title="title" to the header slot tag to pass the prop as a scoped slot.

4

Use BaseCard with named slots and display scoped slot title

In the main app component, import BaseCard and use it. Provide content for the header slot using <template #header="{ title }"> that displays the title inside an <h1>. Provide content for the footer slot with a <p> that says 'Footer content here'.

Vue

// Import BaseCard component
// Your code here



  
    
    
      
    
    
    
      
    
  

Hint

Use <template #header="{ title }"> to access the scoped slot property and display it inside an <h1>.

Practice

1. What is the main purpose of named slots in Vue components?

easy

A. To handle component lifecycle hooks

B. To share data from parent to child components

C. To create reactive state inside a component

D. To place different content in specific parts of a component

Solution

1. Step 1: Understand named slots concept

   Named slots allow you to define multiple placeholders inside a component where different content can be inserted.

2. Step 2: Identify the purpose of named slots

   They help organize content by placing it in specific parts of the component template.

3. Final Answer:

   To place different content in specific parts of a component -> Option D

4. Quick Check:

   Named slots = specific content placement [OK]

Hint: Named slots = different content in specific places [OK]

Common Mistakes:

• Confusing named slots with props
• Thinking named slots share data
• Mixing named slots with lifecycle hooks

2. Which of the following is the correct syntax to define a named slot called header inside a Vue component?

easy

A.

B.

C.

D.

Solution

1. Step 1: Recall named slot syntax in Vue

   Named slots are defined using the element with a name attribute.

2. Step 2: Match correct syntax

   The correct syntax is . Other options are invalid or deprecated.

3. Final Answer:

   <slot name="header"></slot> -> Option C

4. Quick Check:

   Named slot syntax = <slot name="..."> [OK]

Hint: Named slots use syntax [OK]

Common Mistakes:

• Using which is deprecated
• Trying to create custom tags like
• Confusing named slots with props

3. Given this parent usage of a scoped slot:

<MyList>
  <template #item="{ item }">
    <li>{{ item.text }}</li>
  </template>
</MyList>

And this child component template:

<ul>
  <slot name="item" :item="listItem"></slot>
</ul>

What will be rendered if listItem is { text: 'Hello' }?

medium

A. Hello

B.

C. {{ item.text }}

D.

Solution

1. Step 1: Understand scoped slot data passing

   The child passes listItem as item to the slot content using :item="listItem".

2. Step 2: Parent uses slot scope to access item.text

   The parent template receives item and renders <li>{{ item.text }}</li>, which becomes <li>Hello</li>.

3. Final Answer:

   <ul><li>Hello</li></ul> -> Option A

4. Quick Check:

   Scoped slot passes data = rendered content [OK]

Hint: Scoped slots pass data object to slot content [OK]

Common Mistakes:

• Ignoring the slot scope and expecting raw slot tags
• Not using the slot props correctly in parent
• Confusing named slots with scoped slots

4. Identify the error in this Vue component usage:

<MyComponent>
  <template slot="footer">Footer Content</template>
</MyComponent>

Assuming MyComponent defines a named slot footer using <slot name="footer">.

medium

A. Missing v-slot directive on template

B. Using deprecated slot attribute instead of #footer shorthand

C. Named slot must be inside MyComponent template, not usage

D. No error, this is correct syntax

Solution

1. Step 1: Check slot syntax in Vue 3

   The slot attribute on template is deprecated in Vue 3.

2. Step 2: Identify correct syntax for named slots

   Use v-slot:footer or shorthand #footer instead of slot="footer".

3. Final Answer:

   Using deprecated slot attribute instead of #footer shorthand -> Option B

4. Quick Check:

   Use v-slot or # for named slots [OK]

Hint: Use v-slot or #, not slot attribute [OK]

Common Mistakes:

• Using old slot attribute syntax
• Confusing slot definition with slot usage
• Thinking no syntax change in Vue 3

5. You want to create a reusable Card component with named slots for header, body, and footer. The body slot should receive a scoped prop info from the component. Which is the correct way to define the Card template?

hard

A.

B.

C.

D.

Solution

1. Step 1: Identify named slots and scoped props

   The body slot must receive the scoped prop info from the component's data.

2. Step 2: Check slot definitions

   Only the body slot has :info='cardInfo' to pass the scoped prop. The others are simple named slots without props.

3. Final Answer:

   Correct template with named slots and scoped prop on body slot -> Option A

4. Quick Check:

   Scoped prop on body slot only [OK]

Hint: Pass scoped props only on slots needing data [OK]

Common Mistakes:

• Passing scoped props on wrong slots
• Missing scoped prop on body slot
• Using default slot instead of named slots