Use Slot Vue Js
2021年12月4日Register here: http://gg.gg/x4vm9
Transcript from the ’Slots’ Lesson
*Use Slot Vue Jsp
*Use Slot Vue Json
*Use Slot Vue Js Online
Analysis vue.js deeply. Render-slot 的参数 name 代表插槽名称 slotName，fallback 代表插槽的默认内容生成的 vnode 数组。 先忽略 scoped-slot，只看默认插槽逻辑。. This page assumes you’ve already read the Components Basics.Read that first if you are new to components. Vue implements a content distribution API that’s modeled after the current Web Components spec draft, using the slot element to serve as distribution outlets for content. It builds on the popularity and ease of use of Vue 2. In this article, we’ll look at how to use slots to populate content with Vue 3. We can add slots to let us distribute content to the location we want. For instance, we can write.
[00:00:00]
>> Sarah Drasner: Okay, slots are super exciting. I think slots are a really, really cool way to replace content per a thing and you don’t have to pass things down. You don’t have to use props to change things with slots, so they’re really really flexible. So if we have something like our child area here, and we have this slot.
[00:00:19] And then we have this ’p’ tag. It’s a very veritable slot machine, haha, with the terrible dad joke. We can have this slot inside of that component. And then inside the component itself, we actually have a tag. This is slot number one. And then we have this is slot number two.
[00:00:38] I can put in more info too. So if we look at these things, these are actually what’s gonna be inserted into our slots. So we can use slots to populate content. We have, this is slot number 1, I am a veritable slot machine, hahaha, and this is slot number 2 I can put more info into.
[00:00:56] So if we look back at this, we can see we didn’t have to pass things down from child to parent. We’re actually just using the markup itself to pass things into the slot as we need. We can put as much information as we want inside of one of these slots.
[00:01:12] So, we can also have defaults. I love defaults. We can have something like, I am some default text placed right inside of our slot. So that will just stay there and be the content of that slot until we decide that we want to replace it. So you can also have more than one.
[00:01:28] So, let’s say you needed a bunch of different slots for things. Then you can start naming them. And I would actually suggest that if you’re ever going to use more than one, you should start naming them. What would end up happening, if you had multiple slots and one of them had a name, and one of them didn’t, is that anything that was left over would go into the slot with no name.
[00:01:46] But it’s good to be a little bit more precise about those things. If you’re gonna use more than one slot, I would say definitely name them. So here we would do something like h1 slot is headerinfo. I will populate the headerinfo slot. So if we have this slot named header, and this other slot, then basically anything else will go into that extra space.
[00:02:09] So we have that h1 slot header. And I will go in the unnamed slot, and that will output to this. So we have main, this is the main title, and p, I will go into the unnamed slot. So if we want to look at a slots example, we could look at this wine label maker.
[00:02:25] We have, we can make whatever kind of wine we want. So we can say Frontend Masters wine here. And I need an S at the end of that. And I’m going to change the font and I’m going to give it a flourish. And maybe give it like wood grain or cards and then change the image opacity and change the label placement, etc.
[00:02:47] But I can go in between this black label and this white label, because what’s happening here is everything inside of here, this is one big SVG, everything inside of here is a slot. So we’re replacing all of the content that’s inside of there in the slot. And we can change out all of the styles based on that different change.
[00:03:11] So, if we go look at the code, we have this component that’s called black, appBlack and it’s got a template of black. And then we’ve got this div class of black with a slot inside of it. And that slot can populate whatever content we need or want in that place.
[00:03:32] When we start working with build tools, we won’t have to do even wrap that div with a class around it in order to style it, and I’ll show you why when we work with those scoped styles. But, basically we have this component is selected, remember we talked about that special is, and we can say, selected is appBlack, selected is appWhite based on what people are clicking, and we’re changing out the label color as well so, let’s go back to the demo itself and open it up.
[00:04:07]
>> Sarah Drasner: And in here, we’ve got our components, appblack and the template is black, over here we’ve got this container. We’ve got component is selected, and all of this stuff that’s inside of it and these templates or these components are really simple. It’s just got appblack, appwhite, and I can change out the styles based on what’s inside.
[00:04:32] So I’m using these components and switching them out based on what I’ve selected. So you can see how you can dynamically change all of the content or change all of the styling really really easily here. And that’s based off of, you know, clicking between those two values, like you saw here.
[00:04:53] So if we go back, here we got the component is selected and in the button we’re saying selected, is appBlack, or selected is appWhite. So I’m changing those two components out, but I’m not changing anything that’s inside of it, cuz that’s all gonna be inserted with the slot.
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 <slot> element to serve as distribution outlets for content.
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:Use Slot Vue Jsp
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.Use Slot Vue JsonAbbreviated 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 ExamplesUse Slot Vue Js Online
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 <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:← Custom EventsDynamic & Async Components → Caught a mistake or want to contribute to the documentation? Edit this on GitHub! Deployed on Netlify .
Register here: http://gg.gg/x4vm9
https://diarynote-jp.indered.space
Transcript from the ’Slots’ Lesson
*Use Slot Vue Jsp
*Use Slot Vue Json
*Use Slot Vue Js Online
Analysis vue.js deeply. Render-slot 的参数 name 代表插槽名称 slotName，fallback 代表插槽的默认内容生成的 vnode 数组。 先忽略 scoped-slot，只看默认插槽逻辑。. This page assumes you’ve already read the Components Basics.Read that first if you are new to components. Vue implements a content distribution API that’s modeled after the current Web Components spec draft, using the slot element to serve as distribution outlets for content. It builds on the popularity and ease of use of Vue 2. In this article, we’ll look at how to use slots to populate content with Vue 3. We can add slots to let us distribute content to the location we want. For instance, we can write.
[00:00:00]
>> Sarah Drasner: Okay, slots are super exciting. I think slots are a really, really cool way to replace content per a thing and you don’t have to pass things down. You don’t have to use props to change things with slots, so they’re really really flexible. So if we have something like our child area here, and we have this slot.
[00:00:19] And then we have this ’p’ tag. It’s a very veritable slot machine, haha, with the terrible dad joke. We can have this slot inside of that component. And then inside the component itself, we actually have a tag. This is slot number one. And then we have this is slot number two.
[00:00:38] I can put in more info too. So if we look at these things, these are actually what’s gonna be inserted into our slots. So we can use slots to populate content. We have, this is slot number 1, I am a veritable slot machine, hahaha, and this is slot number 2 I can put more info into.
[00:00:56] So if we look back at this, we can see we didn’t have to pass things down from child to parent. We’re actually just using the markup itself to pass things into the slot as we need. We can put as much information as we want inside of one of these slots.
[00:01:12] So, we can also have defaults. I love defaults. We can have something like, I am some default text placed right inside of our slot. So that will just stay there and be the content of that slot until we decide that we want to replace it. So you can also have more than one.
[00:01:28] So, let’s say you needed a bunch of different slots for things. Then you can start naming them. And I would actually suggest that if you’re ever going to use more than one, you should start naming them. What would end up happening, if you had multiple slots and one of them had a name, and one of them didn’t, is that anything that was left over would go into the slot with no name.
[00:01:46] But it’s good to be a little bit more precise about those things. If you’re gonna use more than one slot, I would say definitely name them. So here we would do something like h1 slot is headerinfo. I will populate the headerinfo slot. So if we have this slot named header, and this other slot, then basically anything else will go into that extra space.
[00:02:09] So we have that h1 slot header. And I will go in the unnamed slot, and that will output to this. So we have main, this is the main title, and p, I will go into the unnamed slot. So if we want to look at a slots example, we could look at this wine label maker.
[00:02:25] We have, we can make whatever kind of wine we want. So we can say Frontend Masters wine here. And I need an S at the end of that. And I’m going to change the font and I’m going to give it a flourish. And maybe give it like wood grain or cards and then change the image opacity and change the label placement, etc.
[00:02:47] But I can go in between this black label and this white label, because what’s happening here is everything inside of here, this is one big SVG, everything inside of here is a slot. So we’re replacing all of the content that’s inside of there in the slot. And we can change out all of the styles based on that different change.
[00:03:11] So, if we go look at the code, we have this component that’s called black, appBlack and it’s got a template of black. And then we’ve got this div class of black with a slot inside of it. And that slot can populate whatever content we need or want in that place.
[00:03:32] When we start working with build tools, we won’t have to do even wrap that div with a class around it in order to style it, and I’ll show you why when we work with those scoped styles. But, basically we have this component is selected, remember we talked about that special is, and we can say, selected is appBlack, selected is appWhite based on what people are clicking, and we’re changing out the label color as well so, let’s go back to the demo itself and open it up.
[00:04:07]
>> Sarah Drasner: And in here, we’ve got our components, appblack and the template is black, over here we’ve got this container. We’ve got component is selected, and all of this stuff that’s inside of it and these templates or these components are really simple. It’s just got appblack, appwhite, and I can change out the styles based on what’s inside.
[00:04:32] So I’m using these components and switching them out based on what I’ve selected. So you can see how you can dynamically change all of the content or change all of the styling really really easily here. And that’s based off of, you know, clicking between those two values, like you saw here.
[00:04:53] So if we go back, here we got the component is selected and in the button we’re saying selected, is appBlack, or selected is appWhite. So I’m changing those two components out, but I’m not changing anything that’s inside of it, cuz that’s all gonna be inserted with the slot.
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 <slot> element to serve as distribution outlets for content.
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:Use Slot Vue Jsp
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.Use Slot Vue JsonAbbreviated 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 ExamplesUse Slot Vue Js Online
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 <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:← Custom EventsDynamic & Async Components → Caught a mistake or want to contribute to the documentation? Edit this on GitHub! Deployed on Netlify .
Register here: http://gg.gg/x4vm9
https://diarynote-jp.indered.space
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