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This page assumes you've already read the Components Basics. Read that first if you are

new to components.

Slot Content and 馃崐 Outlet 鈥?/p>

We have learned that components can accept

props, which can be JavaScript values of any type. But how about 馃崐 template content? In

some cases, we may want to pass a template fragment to a child component, and let the

馃崐 child component render the fragment within its own template.

For example, we may have a

component that supports usage like 馃崐 this:

template < FancyButton > Click

me!

The template of looks like

this:

template < 馃崐 button class = "fancy-btn" > < slot >

button >

The element is 馃崐 a slot outlet that indicates where the parent-provided

slot content should be rendered.

And the final rendered DOM:

html < button class 馃崐 =

"fancy-btn" >Click me!

With slots, the is responsible for

rendering the outer (and its fancy styling), 馃崐 while the inner content is

provided by the parent component.

Another way to understand slots is by comparing them

to JavaScript 馃崐 functions:

js // parent component passing slot content FancyButton (

'Click me!' ) // FancyButton renders slot content in its own 馃崐 template function

FancyButton ( slotContent ) { return `

R${ slotContent }

` }

Slot content is not just limited to 馃崐 text. It can be any valid template

content. For example, we can pass in multiple elements, or even other

components:

template 馃崐 < FancyButton > < span style = "color:red" >Click me! <

AwesomeIcon name = "plus" />

By using slots, our is more

flexible and reusable. We can now use it in different places with different 馃崐 inner

content, but all with the same fancy styling.

Vue components' slot mechanism is

inspired by the native Web Component 馃崐 element, but with additional capabilities

that we will see later.

Render Scope 鈥?/p>

Slot content has access to the data scope of 馃崐 the

parent component, because it is defined in the parent. For example:

template < span >{{

message }} < 馃崐 FancyButton >{{ message }}

Here both {{ message

}} interpolations will render the same content.

Slot content does not have 馃崐 access to

the child component's data. Expressions in Vue templates can only access the scope it

is defined in, consistent 馃崐 with JavaScript's lexical scoping. In other

words:

Expressions in the parent template only have access to the parent scope;

expressions in 馃崐 the child template only have access to the child scope.

Fallback Content

鈥?/p>

There are cases when it's useful to specify fallback 馃崐 (i.e. default) content for a

slot, to be rendered only when no content is provided. For example, in a

馃崐 component:

template < button type = "submit" > < slot >

We might

want the text "Submit" 馃崐 to be rendered inside the if the parent didn't provide

any slot content. To make "Submit" the fallback content, 馃崐 we can place it in between the

tags:

template < button type = "submit" > < slot > Submit

Now when we use in a parent component,

providing no content 馃崐 for the slot:

template < SubmitButton />

This will render the

fallback content, "Submit":

html < button type = "submit" >Submit

But 馃崐 if we

provide content:

template < SubmitButton >Save

Then the provided

content will be rendered instead:

html < button type = 馃崐 "submit" >Save

Named

Slots 鈥?/p>

There are times when it's useful to have multiple slot outlets in a single

component. 馃崐 For example, in a component with the following

template:

template < div class = "container" > < header > < main > < footer >

For these cases, 馃崐 the

element has a special attribute, name , which can be used to assign a unique ID to

different 馃崐 slots so you can determine where content should be rendered:

template < div

class = "container" > < header > < 馃崐 slot name = "header" > < main >

< slot > < footer > < slot name = "footer" >

div >

A outlet 馃崐 without name implicitly has the name "default".

In a parent

component using , we need a way to pass multiple 馃崐 slot content fragments,

each targeting a different slot outlet. This is where named slots come in.

To pass a

named slot, 馃崐 we need to use a