How to use slots to distribute content in Vue

Vue is a popular front-end framework that provides a convenient way to manage and organize components on the page. Among them, slot is a very practical function in Vue, which can help us dynamically distribute content in components. This article will introduce how to use slots to distribute content in Vue, and provide some additional usage and precautions.

1. How slot works

In Vue, slot is used to provide a slot for the child component in the parent component template, so that the child component can directly insert content into the template of the parent component. When using slots, you usually add the slot tag in the parent component template, and add named slots and default slots in the child component.

The default slot is a slot without a name, which can be used to insert some default content into subcomponents. Default slots are defined using the special placeholder 58cb293b8600657fad49ec2c8d37b472.

Named slots are defined through the name attribute, and you can specify the named slot into which content is to be inserted in the parent component template. For example:

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<h3>这是一个标题</h3>

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<p>这是一个底部</p>

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e388a4556c0f65e1904146cc1a846beeThis is some content94b3e26ee717c64999d7867364b1b4a3
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<slot name="header"></slot>
<!-- 默认插槽 -->
<slot></slot>
<slot name="footer"></slot>

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In this example, the parent component uses named slots to specify the position of the header and footer in the template, and also uses the default slot to specify the position of the p element.

2. Usage of slot

In Vue, slot also has some common usages, which can make our code more concise, flexible and powerful.

2.1 Exclusive default slot

Sometimes, we may want to let the child component occupy the default slot instead of distributing content to the parent component. In this case, we can use the v-slot:default directive to tell Vue to use the default slot as the template for the subcomponent. For example:

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2.2 Scoped Slot

Sometimes, we may want to access the data of the child component in the parent component. In this case, we can use the scoped slot (scoped slot) to access the data of the child component. The data is passed to the parent component. Scope slots are defined using slot tags with parameters, which are the data passed by the slot to the parent component. For example:

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e388a4556c0f65e1904146cc1a846bee{{ slotProps.msg }}94b3e26ee717c64999d7867364b1b4a3
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5561ea5dffb38dc98d527b0e6fe67885{{ item }}94b3e26ee717c64999d7867364b1b4a3

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<p v-for="item in items" :key="item">{{ item }} - 处理后</p>

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In this example, we use a named slot name , and use the v-slot:name directive in the parent component to receive the data slotProps passed by the child component. In the child component, we loop through the items array and then use scope slots to pass the data to the parent component. In the parent component, we use {{ slotProps.msg }} to access the passed data.

Notes

3. When using slot, you need to pay attention to the following aspects:

3.1 slot can only have one default slot. If you need to define multiple default slots in a component, you can use named slots instead.

3.2 When using slot, all content in the parent component template must be included in the slot, otherwise Vue will report an error.

3.3 When using scope slots, you need to pay attention to naming conflicts. If there are variables or methods with the same name in both parent and child components, unpredictable results may occur.

Summary

4. In Vue, slot is a very useful function that can help us dynamically distribute content to components. By using named slots and scoped slots, we can make our components more flexible and powerful. When using slots, you need to pay attention to some precautions, such as there can only be one default slot. In short, slot is a very important mechanism in Vue, which can help us manage and organize components in the page.

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