Vue Get Slot Props

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If a slot is defined without a name attribute then any content which is placed within component tags not specifying a slot attribute will be placed into that slot. See the multi insertion example on the Vue.js official docs. 在Vue中，slot是很实用的api，父组件可以很容易通过插槽向子组件插入内容，插槽还分为单个插槽，多个插槽和作用域插槽。 在React中，能不能实现和插槽一样的功能呢？当然有了，我们分别来看.

You're browsing the documentation for v2.x and earlier. For v3.x, click here.

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 element to serve as distribution outlets for content.

This allows you to compose components like this:

Then in the template for , you might have:

When the component renders, will be replaced by 'Your Profile'. Slots can contain any template code, including HTML:

Or even other components:

If ‘s template did not contain a 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 ‘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 component:

We might want the text 'Submit' to be rendered inside the most of the time. To make 'Submit' the fallback content, we can place it in between the tags:

Now when we use 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 component with the following template:

For these cases, the element has a special attribute, name, which can be used to define additional slots:

A outlet without name implicitly has the name 'default'.

To provide content to named slots, we can use the v-slot directive on a , providing the name of the slot as v-slot‘s argument:

Now everything inside the elements will be passed to the corresponding slots. Any content not wrapped in a using v-slot is assumed to be for the default slot.

However, you can still wrap default slot content in a if you wish to be explicit:

Either way, the rendered HTML will be:

Note that v-slot can only be added to a (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 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 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 element:

Attributes bound to a 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 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.

For example, we are implementing a 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 component, we can optionally define an alternative 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 (using the 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:

Vue Get Slot Props Games

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 with the slot-scope attribute (using the described here as example):

Here, slot-scope declares the received props object as the slotProps variable, and makes it available inside the 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- 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 described here as an example, here's the equivalent usage using slot-scope:

Scoped slots are a useful feature of Vue.js that can make components more versatile and reusable. The only problem is they're difficult to understand! Trying to get your head around the interweaving of parent and child scopes is like solving a tough math equation.

A good approach when you can't understand something easily is to try put it to use in solving a problem. In this article, I'll demonstrate how I used scoped slots to build a reusable list component.

Note: You can see the finished product in this Codepen.

The basic component

The component we're going to build is called my-list and it displays lists of things. The special feature is that you can customize how the list items are rendered in every usage of the component.

Let's tackle the simplest use case first, and get my-list to render just one list of things: an array of geometric shape names and the number of sides they have.

app.js

index.html

With a bit of CSS added, that will look the following:

Generalizing my-list

Now we want to make my-list versatile enough to render any kind of list. The second test case will be a list of colors, including a small swatch to show what the color looks like.

To do this, we'll have to abstract any data specific to the shapes list. Since the items in our lists may be structured differently, we'll give my-list a slot so the parent can define how any particular list will display.

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 (using the 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:

Vue Get Slot Props Games

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 with the slot-scope attribute (using the described here as example):

Here, slot-scope declares the received props object as the slotProps variable, and makes it available inside the 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- 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 described here as an example, here's the equivalent usage using slot-scope:

Scoped slots are a useful feature of Vue.js that can make components more versatile and reusable. The only problem is they're difficult to understand! Trying to get your head around the interweaving of parent and child scopes is like solving a tough math equation.

A good approach when you can't understand something easily is to try put it to use in solving a problem. In this article, I'll demonstrate how I used scoped slots to build a reusable list component.

Note: You can see the finished product in this Codepen.

The basic component

The component we're going to build is called my-list and it displays lists of things. The special feature is that you can customize how the list items are rendered in every usage of the component.

Let's tackle the simplest use case first, and get my-list to render just one list of things: an array of geometric shape names and the number of sides they have.

app.js

index.html

With a bit of CSS added, that will look the following:

Generalizing my-list

Now we want to make my-list versatile enough to render any kind of list. The second test case will be a list of colors, including a small swatch to show what the color looks like.

To do this, we'll have to abstract any data specific to the shapes list. Since the items in our lists may be structured differently, we'll give my-list a slot so the parent can define how any particular list will display.

app.js

index.html

Let's now create two instances of the my-list component in the root instance to display our two test case lists:

app.js

That will look like this:

Superficial components

What we've just created works fine, but is not great code. my-list is, by name, a component for displaying a list. But we've had to abstract all the logic for rendering the list into the parent. The component does little more than wrap the list with some presentational markup.

Given that there's still repeated code in both declarations of the component (i.e.