Vue Js Slot Props
Vue 2.6 is released with new syntax for Slots using v-slot
directive. In this tutorial, we’re gonna show you:
- Syntax to use Vue Slot with
v-slot
directive along with its shorthand - How to use Vue Named Slots with
v-slot
& examples - How to use Vue
v-slot
for Scoped Slots & examples - Vue Dynamic slots example
It tells Vue which named slot to use, exposes the passed props, which we can destructure. This could be a method or data and works a bit like a render-function in React. Dynamic scoped slots. Right, the final piece of the puzzle. Dynamic scoped slots are much like regular scoped slots, but they have a name derived at runtime.
Related Post: Vue 3 Composition API tutorial with examples
Vue.js - The Progressive JavaScript Framework. 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. In this course, you'll learn how to use slots and scoped slots to create flexible and reusable Vue.js components. Slots allow us to pass components and HTML to components, giving us greater control of the appearance than what we get with props. Slots do not replace props. 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. This allows you to compose components like this.
Vuejs Slot Prop
Contents
Vue slots syntax with v-slot directive
With new v-slot
directive, we can:
– combine html layers: component tag and scope of the slot.
– combine the slot and the scoped slot in a single directive.
For example, this is old syntax with slot-scope
:
This is how we combine ListComponent
and template
tag:
And this is old named slots syntax:
Now we use new Vue v-slot
directive:
You can see that:
– We use <template v-slot:header>
to wrap <p>
tag instead of <p slot='header'>
directly. This is because Vue v-slot
can only be used in <component>
or <template>
html tag. It cannot be used in plain HTML tags (<p>
for example).
– We replace slot='content' slot-scope='{data}'
with v-slot:content='{data}'
by combining slot
& slot-scope
. With new Vue v-slot
directive, all slots are compiled into scoped slots. It improves the performance. Why?
Normal slots are rendered during the parent component’s render cycle. So, if any dependency of a slot changes, both the parent and child components will be re-rendered.
When we use scoped slots, slots are compiled into inline functions and called during the child component’s render cycle. This means:
- data from a scoped slot are collected by the child component which is re-rendered separately.
- the changes of parent scope dependency only affect the parent, not the child component. So the child component doesn’t need to update if it uses only scoped slots.
Shorthand for v-slot
#
is the shorthand for Vue v-slot
directive.
For example, #content
stands for v-slot:content
.
Vue Js Slot Props For Sale
The code above can be written as:
Remember that when using shorthand, we must always specify the name of the slot after #
symbol. We cannot use shorthand like this: #='{item}'
.
It must be: #default='{item}'
in which, #default
is the shorthand for v-slot:default
.
In the next parts, we show you some examples that apply new Vue v-slot
directive in practice.
Vue v-slot examples with Named Slots
If we want to use multiple slots in one component, Named Slots are useful.
The code below shows BkrCard
component template with 3 slots:
- header
- title
- default
Remember that <slot>
without name
attribute has the name default
.
Now look at the parent component which use v-slot
directive to specify name for named slots on <template>
tag:
The result will be:
If we pass only one named slot, the default value will be shown:
Vue v-slot example with default slot
In the example above, we use <template v-slot:default>
for the default slot.
We have other ways to specify html code to be considered as default slot also:
Vue Js Slot Props Car Bodies
– wrap it in a <template>
without Vue v-slot
directive:
– do not wrap it in a <template>
:
The result are the same for 2 cases:
Vue v-slot examples with Scoped Slots
What we should do when we want a child component to allow parent component access its data?
In this example, categories
need to be available to the slot content in the parent. So we bind the categories
as an attribute to the <slot>
element:
The categories
attribute is called slot props.
In the parent scope, Vue v-slot
directive can help us get value of the slot props above:
The result will be:
- Dart
- Flutter
- Vue.js
This is shorthand for v-slot
:
Vue Dynamic slots example
We can use a JavaScript expression in v-slot
directive argument with square brackets:
Now look at the example:
Clicking on the Change button will change the collection
value dynamically.v-slot:[collection]='{categories}'
could become:
v-slot:default='{categories}'
v-slot:new_categories='{categories}'
This is BkrCategories
component with default
and new_categories
slot name:
The result will be:
Conclusion
We’ve learned almost aspects of new Vue v-slot
directive, from v-slot
syntax to its handshort, then apply v-slot
directive on Named Slot examples to Scoped Slots and Dynamic Slots examples.
Happy learning! See you again!