Named slots and scoped slots in Vue - Deep Dive

Overview - Named slots and scoped slots

What is it?

Named slots and scoped slots are ways to pass content from a parent component to a child component in Vue. Named slots let you define multiple placeholders in a child component and fill them with different content from the parent. Scoped slots allow the child to send data back to the parent inside the slot content, making the slot dynamic and interactive. Together, they help build flexible and reusable components.

Why it matters

Without named and scoped slots, components would be rigid and hard to customize. Developers would have to create many similar components for small variations, making code bulky and hard to maintain. Named and scoped slots let you create one component that adapts to many uses, saving time and reducing bugs. This makes apps easier to build, update, and understand.

Where it fits

Before learning named and scoped slots, you should understand Vue components and basic slots. After mastering these, you can learn advanced component patterns like render functions and provide/inject. This topic fits in the middle of Vue component communication techniques.

Mental Model

Core Idea

Named and scoped slots let child components define flexible placeholders that parents fill with content and receive data back, enabling dynamic and reusable UI parts.

Think of it like...

Think of a restaurant menu (child component) with different sections (named slots) like appetizers and desserts. The chef (parent) decides what dishes go in each section. Scoped slots are like the chef telling the waiter details about each dish (data) so the waiter can describe it to customers dynamically.

Child Component
┌─────────────────────────────┐
│  Named Slots:               │
│  ┌───────────────┐          │
│  │ slot 'header' │◄─────────┤ Parent fills with custom header content
│  ├───────────────┤          │
│  │ slot 'footer' │◄─────────┤ Parent fills with custom footer content
│  └───────────────┘          │
│                             │
│  Scoped Slot:                │
│  ┌───────────────────────┐  │
│  │ slot 'item'           │  │
│  │ provides data (e.g.,  │  │
│  │ item info) to parent  │  │
│  └───────────────────────┘  │
└─────────────────────────────┘

Build-Up - 7 Steps

1

Foundation

Basic slots for content insertion

Concept: Introduce the simplest way to pass content from parent to child using default slots.

In Vue, a slot is a placeholder inside a child component where the parent can insert content. For example, a component might have a slot where the parent puts a title or text. The child uses to mark this spot. When rendered, the parent's content appears inside the child at the slot location.

Result

The child component displays the parent's inserted content exactly where the slot is placed.

Understanding basic slots is essential because named and scoped slots build on this idea of passing content into components.

2

Foundation

Named slots for multiple placeholders

Concept: Learn how to define and use multiple slots with names to insert different content pieces.

Sometimes a component needs more than one slot. Named slots let you label each slot with a name, like and . The parent uses