slotplus

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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😄 Outlet ​

We have learned that components can accept

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

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

😄 child component render the fragment within its own template.

For example, we may have a

component that supports usage like😄 this:

template < FancyButton > Click

me!

The template of looks like

this:

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

button >

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

slot content should be rendered.

And the final rendered DOM:

html < button class😄 =

"fancy-btn" >Click me!

With slots, the is responsible for

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

provided by the parent component.

Another way to understand slots is by comparing them

to JavaScript😄 functions:

js // parent component passing slot content FancyButton (

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

FancyButton ( slotContent ) { return `

R${ slotContent }

` }

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

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

components:

template😄 < 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😄 inner

content, but all with the same fancy styling.

Vue components' slot mechanism is

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

that we will see later.

Render Scope ​

Slot content has access to the data scope of😄 the

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

template < span >{{

message }} <😄 FancyButton >{{ message }}

Here both {{ message

}} interpolations will render the same content.

Slot content does not have😄 access to

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

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

words:

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

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

Fallback Content

​

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

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

😄 component:

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

We might

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

any slot content. To make "Submit" the fallback content,😄 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😄 for the slot:

template < SubmitButton />

This will render the

fallback content, "Submit":

html < button type = "submit" >Submit

But😄 if we

provide content:

template < SubmitButton >Save

Then the provided

content will be rendered instead:

html < button type =😄 "submit" >Save

Named

Slots ​

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

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

template:

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

For these cases,😄 the

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

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

template < div

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

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

div >

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

In a parent

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

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

To pass a

named slot,😄 we need to use a