VUE3 Quick Start: Using slots for slot distribution

Vue3 is a very popular JavaScript framework, popular due to its ease of use and flexibility. In Vue3, using slots for slot distribution allows users to customize components more flexibly. This article will introduce you how to use slots for slot distribution and get started with Vue3 quickly.

1. What is slot distribution

Slot distribution is a built-in function of the component in Vue3, which allows users to pass any type of content through the component to achieve different levels of rendering within the component. In short, slot distribution is applied to components, allowing you to distribute the content of the component in the following way: users can insert content into the slot location of the Vue3 component without needing to know the implementation details of the component. By using slot distribution, developers can have more flexible control over the presentation and interaction behavior of components.

2. How to use slot distribution

First of all, before using slot distribution, you need to define a Vue3 component. Suppose we need to implement a page with a title and text. The following functions can be achieved by using slot distribution:

1. Users can define the positions of the title and text.
2. The default position of text is below the title.

The code to define a Vue3 component is as follows:

<template>
    <div>
        <h1>组件名称</h1>
        <slot name="caption"></slot>
        <p>默认文本</p>
        <slot name="text"></slot>
    </div>
</template>

In the above code, we define a title named "Component Name" and use two types: The mark of the slot. One slot tag points to the slot location named "caption", while the other slot tag points to the slot location named "text".

Next, you can do slot distribution by using this component and providing content for the slot tag. For example:

<template>
    <div>
        <MyComponent>
            <template v-slot:caption>
                <h2>自定义标题</h2>
            </template>
            <template v-slot:text>
                <p>文本内容</p>
            </template>
        </MyComponent>
    </div>
</template>

In the above code, we assigned "I am a caption" and "I am a text" to the slot tags of the above components respectively.

3. Advanced techniques for using slots

1. Default slot

The default slot refers to a slot without a specified name. It will replace the parent slot. Anything a Vue3 component passes to a child component is passed to this location. For example, to apply a default slot in a component, include the content in markup. Example code is as follows:

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

This passes the address to everything in the component, for example the following code:

<template>
    <div>
        <MyComponent>
            <p>文本内容</p>
            <h2>自定义标题</h2>
            <ul>
                <li>列表项1</li>
                <li>列表项2</li>
            </ul>
        </MyComponent>
    </div>
</template>

2. Named Slot

Named Slot A slot is a slot where you can specify content by name. Default slots use default names unless specified. Use named slots to use multiple slots in the same component and select a specific slot based on its name. For example, to use a named slot in a component, add the "name" attribute in the slot tag, the sample code is as follows:

<template>
    <div>
        <h1>组件名称</h1>
        <slot name="header"></slot>
        <p>默认文本</p>
        <slot name="footer"></slot>
    </div>
</template>

Then when assigning a child component in the application, you can assign the slot based on the name The position corresponds to the data content, the sample code is as follows:

<template>
    <div>
        <MyComponent>
            <template v-slot:header>
                <h2>自定义标题</h2>
            </template>
            <template v-slot:footer>
                <h4>自定义页脚</h4>
            </template>
        </MyComponent>
    </div>
</template>

3. Scope slot

Scope slot is a way that you can pass context data to other Vue3 The component's slot. For example, to use scoped slots in a component, add a parameter to the slot tag, such as "slot-scope". The sample code is as follows:

<template>
    <div>
        <ul>
            <li v-for="{{ menuItem in menuItems }}">
                <slot name="item" v-bind="menuItem"></slot>
            </li>
        </ul>
    </div>
</template>

Then when assigning the child component, you can add a slot named "item" in the template as follows:

<template>
    <div>
        <Menu>
            <template v-slot:item="menuItem">
                <li>{{ menuItem.text }}</li>
            </template>
        </Menu>
    </div>
</template>

In the above example, "menuItem" is a context object passed to the slot that contains all the data passed with the component. You can refer to any single property by name, such as "menuItem.text".

Summary

In Vue3, using slot distribution allows users to customize components more flexibly. Powerful customization can be achieved by using three methods of slot distribution: default slots, named slots, and scope slots. This article details how to use slot distribution and advanced techniques for using slots. I hope it can help you quickly get started with Vue3 and start building dynamic and flexible web applications.

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