How to Extend A Vue.js Component With Slots?

To extend a Vue.js component with slots, you can use the v-slot directive in the parent component to pass content into designated slots of the child component. Slots allow you to create flexible and reusable components by injecting different content into specific areas of the component.

In the child component, you can define named slots using the slot element and give them a name attribute. These named slots serve as placeholders where the content from the parent component will be inserted. You can also provide default content within the slot element, which will be displayed if no content is passed in from the parent component.

In the parent component, you can use the v-slot directive to bind specific content to the named slots in the child component. You can pass any type of content, such as text, HTML elements, or even other Vue components, into the slots. This gives you the flexibility to customize the appearance and functionality of the child component based on the content passed in from the parent component.

By extending a Vue.js component with slots, you can create more dynamic and versatile components that can be easily reused and customized in different parts of your application. Slots provide a powerful way to separate the structure and design of your components, making your code more modular and easier to maintain.

What is slot default in Vue.js?

In Vue.js, a slot default is a placeholder in a component where content can be inserted. When a component has a slot default, any content that is not explicitly assigned to a named slot will be inserted into the slot default. This allows for more flexibility in how components can be used and allows for dynamic content to be inserted into the component.

How to access data in a slot in Vue.js?

To access data in a slot in Vue.js, you can use the scoped slot feature. Scoped slots allow you to pass data from a parent component to a slot in a child component.

Here's an example of how you can access data in a slot using scoped slots:

1. In the parent component, define a data property that you want to pass to the slot:

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<template>
  <div>
    <child-component>
      <template v-slot="slotProps">
        <p>The data passed from the parent component is: {{ slotProps.data }}</p>
      </template>
    </child-component>
  </div>
</template>

<script>
export default {
  data() {
    return {
      parentData: 'Hello from parent component'
    }
  }
}
</script>

1. In the child component, define a slot and pass the data property from the parent component using the v-bind directive:

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<template>
  <div>
    <slot v-bind:data="parentData"></slot>
  </div>
</template>

<script>
export default {
  props: ['parentData']
}
</script>

In this example, the parentData property from the parent component is passed to the slot in the child component using scoped slots. The data can be accessed in the slot using the slotProps object.

How to render multiple slots in Vue.js?

To render multiple slots in Vue.js, you can use named slots. Named slots allow you to define multiple slots in a component and give them a specific name. Here's how you can render multiple slots in Vue.js:

1. Define the slots in your component template using the element and give each slot a unique name:

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<template>
  <div>
    <h1><slot name="header"></slot></h1>
    <div><slot name="content"></slot></div>
    <footer><slot name="footer"></slot></footer>
  </div>
</template>

1. Use the component in a parent component and provide content for each slot using the v-slot directive:

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<template>
  <div>
    <my-component>
      <template v-slot:header>
        Header content goes here
      </template>
      
      <template v-slot:content>
        Main content goes here
      </template>
      
      <template v-slot:footer>
        Footer content goes here
      </template>
    </my-component>
  </div>
</template>

<script>
import MyComponent from './MyComponent.vue'

export default {
  components: {
    MyComponent
  }
}
</script>

In this example, the MyComponent component has three named slots: header, content, and footer. In the parent component, we provide content for each slot using the v-slot directive and specify the slot name.

By using named slots, you can render multiple slots with different content in Vue.js.

What is slot-scope shorthand in Vue.js?

In Vue.js, the slot-scope shorthand is a syntax for passing data from the parent component to a slot in a child component. It allows the child component to access and manipulate the data passed from the parent component within the slot content.

The shorthand syntax uses the "v-slot" directive with a colon followed by the name of the data variable that will be passed to the slot. For example:

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<template>
  <parent-component>
    <template v-slot:default="data">
      // Access and use data here
    </template>
  </parent-component>
</template>

In this example, the data variable is passed from the parent component to the slot in the child component, allowing the child component to access and use the data within the slot content.