In Vue3, we often encounter situations where we need to deal with list rendering. Vue3 introduces a new syntax, namely #default="scope", for more convenient handling of list rendering and scoped slots. This article will introduce in detail the usage and features of the #default="scope" code in Vue3.
What is #default="scope"?
In Vue3, #default="scope" is a syntax for handling list rendering. It allows us to define a slot in the parent component and pass data to the slot through the child component. This way we can use the data of the child component in the parent component and render as needed.
How to use #default="scope"?
To use the #default="scope" code, we need to define a slot in the parent component and pass data to the slot in the child component. Here are the basic steps to use #default="scope" code:
- Define a slot in the parent component, use the #default directive, and name it "scope". For example:
<template>
<div>
<slot #default="scope"></slot>
</div>
</template>
- In a subcomponent, pass data to the slot. The data can be bound to the slot's properties using the v-bind directive. For example:
<template>
<div>
<slot v-bind:item="item" v-for="item in items" :key=""></slot>
</div>
</template>
In this example, we use the v-for directive to iterate over an array called items and pass each item to the slot. We also used the :key directive to ensure that each slot has a unique identifier.
- Use child components in the parent component and access the data passed by the child component in the slot. The slot properties can be used to access the data passed by the child component. For example:
<template>
<div>
<my-component>
<template #default="scope">
<div>{{ }}</div>
</template>
</my-component>
</div>
</template>
In this example, we use the child component my-component in the parent component and the #default="scope" code in the slot. By doing this, we can access the item data passed by the child component and render it in the parent component.
The feature of #default="scope"
Using the #default="scope" code has the following features:
- The parent component can access the data of the child component: Through the #default="scope" code, the parent component can access the data passed by the child component and render it in the parent component. This makes it easier to handle list rendering and scoped slots.
- The data of the subcomponent can be used in the slot: Through the properties of the slot, we can access the data passed by the subcomponent in the slot and render it as needed. This allows for more flexible list rendering and component reuse.
- Support loop rendering: Through the v-for directive, we can loop render subcomponents and pass the data of each subcomponent to the slot. This allows easy handling of list renderings containing multiple subcomponents.
Summarize
In Vue3, the #default="scope" code provides us with a more convenient syntax for handling list rendering and scoped slots. By defining slots in the parent component and passing data in the child component, we can handle list rendering more flexibly and access the child component's data in the parent component. This syntax introduction makes Vue3 more powerful and easy to use, providing us with more possibilities to build complex applications.
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