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full from of cbet component that supports usage like this:
template < FancyButton > Click
me!
The template of looks like
this:
template < button class = "fancy-btn" > < slot >
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" >
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 element with the v-slot directive, and then
pass the name of the slot as an argument to v-slot :
template < BaseLayout > < template
v-slot:header >
v-slot has a dedicated shorthand # , so can be shortened to
just . Think of it as "render this template fragment in the child
component's 'header' slot".
Here's the code passing content for all three slots to
using the shorthand syntax:
template < BaseLayout > < template # header >
< h1 >Here might be a page title < template # default > < p >A
paragraph for the main content. < p >And another one. <
template # footer > < p >Here's some contact info
When a component accepts both a default slot and named slots, all top-level non-
nodes are implicitly treated as content for the default slot. So the above
can also be written as:
template < BaseLayout > < template # header > < h1 >Here might
be a page title < p >A paragraph
for the main content. < p >And another one. < template # footer > < p
>Here's some contact info
Now everything inside the
elements will be passed to the corresponding slots. The final rendered HTML
will be:
html < div class = "container" > < header > < h1 >Here might be a page title < main > < p >A paragraph for the main content. < p >And another
one. < footer > < p >Here's some contact info
Again, it may help you understand named slots better using the JavaScript function
analogy:
js // passing multiple slot fragments with different names BaseLayout ({
header: `...` , default: `...` , footer: `...` }) // renders them in
different places function BaseLayout ( slots ) { return `
${ slots . default }
` }
Dynamic Slot Names
Dynamic directive arguments also
work on v-slot , allowing the definition of dynamic slot names:
template < base-layout
> < template v-slot: [ dynamicSlotName ]> ... <
template #[ dynamicSlotName ]> ...
Do note the
expression is subject to the syntax constraints of dynamic directive arguments.
Scoped
Slots
As discussed in Render Scope, slot content does not have access to state in the
child component.
However, there are cases where it could be useful if a slot's content
can make use of data from both the parent scope and the child scope. To achieve that,
we need a way for the child to pass data to a slot when rendering it.
In fact, we can
do exactly that - we can pass attributes to a slot outlet just like passing props to a
component:
template < div > < slot : text = "
greetingMessage " : count = " 1 " >
Receiving the slot props is a bit
different when using a single default slot vs. using named slots. We are going to show
how to receive props using a single default slot first, by using v-slot directly on the
child component tag:
template < MyComponent v-slot = " slotProps " > {{ slotProps.text
}} {{ slotProps.count }}
The props passed to the slot by the child are
available as the value of the corresponding v-slot directive, which can be accessed by
expressions inside the slot.
You can think of a scoped slot as a function being passed
into the child component. The child component then calls it, passing props as
arguments:
js MyComponent ({ // passing the default slot, but as a function default : (
slotProps ) => { return `${ slotProps . text }R${ slotProps . count }` } }) function
MyComponent ( slots ) { const greetingMessage = 'hello' return `${ // call the
slot function with props! slots . default ({ text: greetingMessage , count: 1 })
}
` }
In fact, this is very close to how scoped slots are compiled, and how you
would use scoped slots in manual render functions.
Notice how v-slot="slotProps"
matches the slot function signature. Just like with function arguments, we can use
destructuring in v-slot :
template < MyComponent v-slot = " { text, count } " > {{ text
}} {{ count }}
Named Scoped Slots
Named scoped slots work similarly
- slot props are accessible as the value of the v-slot directive:
v-slot:name="slotProps" . When using the shorthand, it looks like this:
template <
MyComponent > < template # header = " headerProps " > {{ headerProps }} <
template # default = " defaultProps " > {{ defaultProps }} < template #
footer = " footerProps " > {{ footerProps }}
Passing
props to a named slot:
template < slot name = "header" message = "hello" >
Note the name of a slot won't be included in the props because it is reserved - so
the resulting headerProps would be { message: 'hello' } .
If you are mixing named slots
with the default scoped slot, you need to use an explicit tag for the
default slot. Attempting to place the v-slot directive directly on the component will
result in a compilation error. This is to avoid any ambiguity about the scope of the
props of the default slot. For example:
template <
template > < MyComponent v-slot = " { message } " > < p >{{ message }} < template
# footer > < p
>{{ message }}
Using an explicit
tag for the default slot helps to make it clear that the message prop is not
available inside the other slot:
template < template > < MyComponent > < template # default = " { message } " > < p >{{ message }} < template # footer > < p >Here's some contact info
Fancy List Example
You may be wondering what would
be a good use case for scoped slots. Here's an example: imagine a component
that renders a list of items - it may encapsulate the logic for loading remote data,
using the data to display a list, or even advanced features like pagination or infinite
scrolling. However, we want it to be flexible with how each item looks and leave the
styling of each item to the parent component consuming it. So the desired usage may
look like this:
template < FancyList : api-url = " url " : per-page = " 10 " > <
template # item = " { body, username, likes } " > < div class = "item" > < p >{{ body
}} < p >by {{ username }} | {{ likes }} likes
Inside , we can render the same multiple times with
different item data (notice we are using v-bind to pass an object as slot
props):
template < ul > < li v-for = " item in items " > < slot name = "item" v-bind =
" item " >
Renderless Components
The use case we
discussed above encapsulates both reusable logic (data fetching, pagination etc.) and
visual output, while delegating part of the visual output to the consumer component via
scoped slots.
If we push this concept a bit further, we can come up with components
that only encapsulate logic and do not render anything by themselves - visual output is
fully delegated to the consumer component with scoped slots. We call this type of
component a Renderless Component.
An example renderless component could be one that
encapsulates the logic of tracking the current mouse position:
template < MouseTracker
v-slot = " { x, y } " > Mouse is at: {{ x }}, {{ y }}
While an
interesting pattern, most of what can be achieved with Renderless Components can be
achieved in a more efficient fashion with Composition API, without incurring the
overhead of extra component nesting. Later, we will see how we can implement the same
mouse tracking functionality as a Composable.
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