How to use v-slot default slot in Vue

Vue is a popular front-end framework that provides many instructions to help us develop better. Among them, v-slot is a very important instruction, which allows us to combine components more flexibly and improve the readability and reusability of the code.

The default slot is a slot type in v-slot. Using the default slot, you can pass the HTML structure in the parent component to the child component, so that the child component can use it as its own child element. render. This article will introduce you in detail how to use the v-slot default slot in Vue.

The syntax of the default slot

First, let’s take a look at the basic syntax of the default slot:

<template>
  <div>
    <slot></slot>
  </div>
</template>

The above code defines a simple component, which contains a Default slot. When we use this component, we can place any HTML structure inside the component tag, and these HTML structures will be passed to the <slot></slot> tag inside the component, and in order Render it out.

<my-component>
  <p>Hello, world!</p>
</my-component>

The above code adds a <p></p> tag inside the <my-component></my-component> tag, this <p></p> The tag will be passed to the <slot></slot> tag inside the component and rendered.

Named Slots

When we use multiple slots in a component, if we all use the default slots, then these slots will be rendered in order. This situation may It will make our code cluttered. To avoid this we can use named slots.

The difference between named slots and default slots is that when using named slots, we need to give the slot a name and specify this name when passing the HTML structure. Here is an example of a component using named slots:

<template>
  <div>
    <slot name="header"></slot>
    <div>
      <slot></slot>
    </div>
    <slot name="footer"></slot>
  </div>
</template>

The above code defines three slots, where name="header" and name="footer" is a named slot, while the <slot></slot> label without the name attribute is the default slot. When we use this component, we can use the v-slot directive to specify the content of a slot and pass the HTML structure to this slot.

<my-component>
  <template v-slot:header>
    <h1 id="This-is-the-header">This is the header</h1>
  </template>
  <p>Hello, world!</p>
  <template v-slot:footer>
    <footer>Footer</footer>
  </template>
</my-component>

The above code uses the v-slot directive to specify the contents of three slots. It can be seen that using named slots can greatly improve the readability and maintainability of components. .

Abbreviated syntax

In order to further simplify the code, Vue 2.6.0 introduced a shorthand syntax:

<template>
  <div>
    <slot name="header"></slot>
    <div>
      <slot></slot>
    </div>
    <slot name="footer"></slot>
  </div>
</template>


  
  
Hello, world!
  

As you can see, we can use # instead of v-slot:, abbreviate v-slot:name to #name, which makes it easier to write code.

Summary

Using default slots can pass HTML structures in components, using named slots can make the code more readable and maintainable, and using abbreviated syntax can make it easier to write code . Mastering the use of v-slot allows us to organize code more flexibly and improve project development efficiency and code quality.

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