Slot Into Place Definition
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This page assumes you’ve already read the Components Basics. Read that first if you are new to components.
In 2.6.0, we introduced a new unified syntax (the v-slot
directive) for named and scoped slots. It replaces the slot
and slot-scope
attributes, which are now deprecated, but have not been removed and are still documented here. The rationale for introducing the new syntax is described in this RFC.
Slot Content
Vue implements a content distribution API inspired by the Web Components spec draft, using the <slot>
element to serve as distribution outlets for content.
Once all the containers are in place, cladding and branding can be easily applied to the outside to complete the building. In Edinburgh, meanwhile, a 160-bedroom Courtyard hotel by Marriott is being developed by Polcom using modular construction and finished with brick and aluminum panels.
- Alternatively known as a bus slot or expansion port, an expansion slot is a connection or port inside a computer on the motherboard or riser card. It provides an installation point for a hardware expansion card to be connected.
- Slot-in definition: Verb 1. Used other than as an idiom: slot in. To put something into a slot. To put something into its desired place 4. To schedule something for a particular time.I'll slot you in between my 3 o'clock and 4 o'clock appointmen.
This allows you to compose components like this:
Then in the template for <navigation-link>
, you might have:
When the component renders, <slot></slot>
will be replaced by “Your Profile”. Slots can contain any template code, including HTML:
Or even other components:
If <navigation-link>
‘s template did not contain a <slot>
element, any content provided between its opening and closing tag would be discarded.
Compilation Scope
When you want to use data inside a slot, such as in:
That slot has access to the same instance properties (i.e. the same “scope”) as the rest of the template. The slot does not have access to <navigation-link>
‘s scope. For example, trying to access url
would not work:
As a rule, remember that:
Everything in the parent template is compiled in parent scope; everything in the child template is compiled in 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 <submit-button>
component:
We might want the text “Submit” to be rendered inside the <button>
most of the time. To make “Submit” the fallback content, we can place it in between the <slot>
tags:
Now when we use <submit-button>
in a parent component, providing no content for the slot:
will render the fallback content, “Submit”:
But if we provide content:
Then the provided content will be rendered instead:
Named Slots
Updated in 2.6.0+. See here for the deprecated syntax using the slot
attribute.
There are times when it’s useful to have multiple slots. For example, in a <base-layout>
component with the following template:
For these cases, the <slot>
element has a special attribute, name
, which can be used to define additional slots:
A <slot>
outlet without name
implicitly has the name “default”.
To provide content to named slots, we can use the v-slot
directive on a <template>
, providing the name of the slot as v-slot
‘s argument:
Now everything inside the <template>
elements will be passed to the corresponding slots. Any content not wrapped in a <template>
using v-slot
is assumed to be for the default slot.
However, you can still wrap default slot content in a <template>
if you wish to be explicit:
Either way, the rendered HTML will be:
Note that v-slot
can only be added to a <template>
(with one exception), unlike the deprecated slot
attribute.
Scoped Slots
Updated in 2.6.0+. See here for the deprecated syntax using the slot-scope
attribute.
Sometimes, it’s useful for slot content to have access to data only available in the child component. For example, imagine a <current-user>
component with the following template:
We might want to replace this fallback content to display the user’s first name, instead of last, like this:
That won’t work, however, because only the <current-user>
component has access to the user
and the content we’re providing is rendered in the parent.
To make user
available to the slot content in the parent, we can bind user
as an attribute to the <slot>
element:
Attributes bound to a <slot>
element are called slot props. Now, in the parent scope, we can use v-slot
with a value to define a name for the slot props we’ve been provided:
In this example, we’ve chosen to name the object containing all our slot props slotProps
, but you can use any name you like.
Abbreviated Syntax for Lone Default Slots
In cases like above, when only the default slot is provided content, the component’s tags can be used as the slot’s template. This allows us to use v-slot
directly on the component:
This can be shortened even further. Just as non-specified content is assumed to be for the default slot, v-slot
without an argument is assumed to refer to the default slot:
Note that the abbreviated syntax for default slot cannot be mixed with named slots, as it would lead to scope ambiguity:
Whenever there are multiple slots, use the full <template>
based syntax for all slots:
Destructuring Slot Props
Internally, scoped slots work by wrapping your slot content in a function passed a single argument:
That means the value of v-slot
can actually accept any valid JavaScript expression that can appear in the argument position of a function definition. So in supported environments (single-file components or modern browsers), you can also use ES2015 destructuring to pull out specific slot props, like so:
This can make the template much cleaner, especially when the slot provides many props. It also opens other possibilities, such as renaming props, e.g. user
to person
:
You can even define fallbacks, to be used in case a slot prop is undefined:
Dynamic Slot Names
New in 2.6.0+
Dynamic directive arguments also work on v-slot
, allowing the definition of dynamic slot names:
Named Slots Shorthand
New in 2.6.0+
Similar to v-on
and v-bind
, v-slot
also has a shorthand, replacing everything before the argument (v-slot:
) with the special symbol #
. For example, v-slot:header
can be rewritten as #header
:
However, just as with other directives, the shorthand is only available when an argument is provided. That means the following syntax is invalid:
Instead, you must always specify the name of the slot if you wish to use the shorthand:
Other Examples
Slot props allow us to turn slots into reusable templates that can render different content based on input props. This is most useful when you are designing a reusable component that encapsulates data logic while allowing the consuming parent component to customize part of its layout.
Slot Into Place Definition Francais
For example, we are implementing a <todo-list>
component that contains the layout and filtering logic for a list:
Instead of hard-coding the content for each todo, we can let the parent component take control by making every todo a slot, then binding todo
as a slot prop:
Now when we use the <todo-list>
component, we can optionally define an alternative <template>
for todo items, but with access to data from the child:
However, even this barely scratches the surface of what scoped slots are capable of. For real-life, powerful examples of scoped slot usage, we recommend browsing libraries such as Vue Virtual Scroller, Vue Promised, and Portal Vue.
Deprecated Syntax
The v-slot
directive was introduced in Vue 2.6.0, offering an improved, alternative API to the still-supported slot
and slot-scope
attributes. The full rationale for introducing v-slot
is described in this RFC. The slot
and slot-scope
attributes will continue to be supported in all future 2.x releases, but are officially deprecated and will eventually be removed in Vue 3.
Named Slots with the slot
Attribute
Deprecated in 2.6.0+. See here for the new, recommended syntax.
To pass content to named slots from the parent, use the special slot
attribute on <template>
(using the <base-layout>
component described here as example):
Or, the slot
attribute can also be used directly on a normal element:
There can still be one unnamed slot, which is the default slot that serves as a catch-all for any unmatched content. In both examples above, the rendered HTML would be:
Scoped Slots with the slot-scope
Attribute
Deprecated in 2.6.0+. See here for the new, recommended syntax.
To receive props passed to a slot, the parent component can use <template>
with the slot-scope
attribute (using the <slot-example>
described here as example):
Here, slot-scope
declares the received props object as the slotProps
variable, and makes it available inside the <template>
scope. You can name slotProps
anything you like similar to naming function arguments in JavaScript.
Here slot='default'
can be omitted as it is implied:
The slot-scope
attribute can also be used directly on a non-<template>
element (including components):
The value of slot-scope
can accept any valid JavaScript expression that can appear in the argument position of a function definition. This means in supported environments (single-file components or modern browsers) you can also use ES2015 destructuring in the expression, like so:
Using the <todo-list>
described here as an example, here’s the equivalent usage using slot-scope
:
Alternatively known as a bus slot or expansion port, an expansion slot is a connection or port inside a computer on the motherboard or riser card. It provides an installation point for a hardware expansion card to be connected. For example, if you wanted to install a new video card in the computer, you'd purchase a video expansion card and install that card into the compatible expansion slot.
Computer expansion slots
Below is a listing of expansion slots commonly found in a computer and the devices associated with those slots. Clicking on any of the links below provide you with additional details.
- AGP - Video card.
- AMR - Modem, sound card.
- CNR - Modem, network card, sound card.
- EISA - SCSI, network card, video card.
- ISA - Network card, sound card, video card.
- PCI - Network card, SCSI, sound card, video card.
- PCI Express - Video card, modem, sound card, network card.
- VESA - Video card.
Many of the above expansion card slots are obsolete. You're most likely only going to encounter AGP, PCI, and PCI Express when working with computers today. In the picture below is an example of what expansion slots may look like on a motherboard. In this picture, there are three different types of expansion slots: PCI Express, PCI, and AGP.
How many expansion slots does my computer have?
Every computer motherboard is different, to determine how many expansion slots are on your computer motherboard identify the manufacturer and model of the motherboard. Once you've identified the model of motherboard, you can find complete information about the motherboard in its manual.
Adding additional expansion slots for older motherboards could be accomplished by using a riser board, which would add several ISA or PCI slots. Today, riser boards are rarely used with motherboards, as there is limited need for additional expansion slots with modern motherboards.
Slot Into Place Definition Synonym
What type of expansion slots are on my motherboard?
As mentioned above, every motherboard model is unique, so to determine the type of expansion slots on the motherboard, consult the board's specifications and owner's manual. You can also open the computer case and visually examine the motherboard.
Slot Into Place Definition Dictionary
Why do computers have expansion slots?
Computers have expansion slots to give the user the ability to add new devices to their computer. For example, a computer gamer may upgrade their video card to get better performance in their games. An expansion slot allows them to remove the old video card and add a new video card without replacing the motherboard.
What is the most common expansion slot today?
Today, the most commonly used expansion slot used and found on computer motherboards is the PCI Express expansion slot.
Does a laptop have an expansion slot?
Laptops do not have expansion slots like a desktop computer. However, some laptops do have PC Cards that can be inserted into the side of the laptop. They may also have a Cardbus slot for an ExpressCard to be added.
Related expansion slot pages
Slot Into Place Definition Synonyms
Expansion, Expansion card, Motherboard terms, Seated