Detailed explanation of slot function in Vue3: using slots to implement more flexible components

Vue is a popular JavaScript front-end framework. Its third version (Vue3) introduces many new features, one of which is the slot function. This article will explain in detail what the slot function is and how to use it to implement more flexible components.

What is the slot function

In Vue, a component is an abstracted part of a page element. A component can be included in other components. Normally, the content of a component is fixed, but sometimes we want the content of the component to be variable. This is the role of the slot function.

Simply put, the slot function is a special Vue component internal function, used in the component template, which allows the content of a component to be replaced with child elements provided by the parent component. In Vue2, the slot function can be used inside or outside the component. But in Vue3, the slot function must be used inside the component, and the syntax of slot is also somewhat different from Vue2.

How to use the slot function

Syntactically speaking, Vue3's slot function has two forms: ordinary slots and named slots.

Normal slot

Normal slot will replace the entire content of the parent component with the content of the child component. Here is a simple example:

Parent component code:

<template>
  <div>
    <h1 id="这是父组件的标题">这是父组件的标题</h1>
    <ChildComponent>
      <p>这是子组件的内容</p>
    </ChildComponent>
  </div>
</template>

Child component code:

<template>
  <div>
    <h2 id="这是子组件的标题">这是子组件的标题</h2>
    <slot></slot>
  </div>
</template>

In this example, the parent component contains a child component (ChildComponent), The subcomponent contains a normal slot. When the parent component renders, the child component will be replaced with the content provided by the parent component, and the result is as follows:

<div>
  <h1 id="这是父组件的标题">这是父组件的标题</h1>
  <div>
    <h2 id="这是子组件的标题">这是子组件的标题</h2>
    <p>这是子组件的内容</p>
  </div>
</div>

As can be seen from the result, the child component completely replaces the position of the slot, and the The content will be rendered in its original location.

Named Slot

Named slot is a more flexible slot type that allows us to define multiple slots in a component. The following is an example with multiple slots:

Parent component code:

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

In this example, we define three slots: header, default and footer. The default slot has no name, so the slot's name attribute is not used.

The parent component can control the content of the child component through the slot name when using the child component. Here is an example:

<template>
  <div>
    <MyComponent>
      <template #header>
        <h1 id="这是头部">这是头部</h1>
      </template>
      <p>这是内容</p>
      <template #footer>
        <h2 id="这是尾部">这是尾部</h2>
      </template>
    </MyComponent>
  </div>
</template>

In this example, the parent component uses MyComponent and controls its content through named slots. The results are as follows:

<div>
  <div class="header">
    <h1 id="这是头部">这是头部</h1>
  </div>
  <div class="body">
    <p>这是内容</p>
  </div>
  <div class="footer">
    <h2 id="这是尾部">这是尾部</h2>
  </div>
</div>

Summary

Through the introduction of this article, we have learned what the slot function is and how to use slots to implement more flexible components. The slot function in Vue3 is a very powerful tool that allows us to add any amount of dynamic content to a component and let the parent component control the location and display of these contents.

If you are learning Vue3, then the slot function is a technology that must be mastered. It can help you implement more flexible and reusable components. I hope this article will help you understand the slot function.

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