Vue.js 3.0 Tutorial

Vue.js 3.0 Component Advanced

Vue.js 3.0 Transitions & Animations

Vue.js 3.0 Reusable & Combinable

Vue.js 3.0 Advanced

Vue.js 3.0 Tools

Vue.js 3.0 Scale

Vue.js 3.0 Accessibility

Vue.js 3.0 Migrating from Vue2

Vue.js 3.0 Contribute Documentation

Vue.js 3.0 API References

Vue.js 3.0 Style Guide

Vue 3.0 Style Guide

Vue 3.0 Slot Unity

The concept of slots in Vue is used for component composition. Slots give you an outlet to place content in new places or make components more reusable.

In Vue 3, there have been some changes in the syntax for slots, making them easier to read and understand.

Here is a simple example to illustrate the use of slots in Vue 3:

Let's suppose we have a reusable component called BaseLayout.vue, which contains the structure for a page, but we want to allow content to be customized.

<!-- BaseLayout.vue -->
<template>
  <div>
    <header>
      <slot name="header"></slot>
    </header>
    <main>
      <slot></slot>
    </main>
    <footer>
      <slot name="footer"></slot>
    </footer>
  </div>
</template>

In the BaseLayout component, we've specified three slots: one unnamed default slot and two named slots (header and footer).

Now, we'll use this BaseLayout component in our HomePage.vue component and fill in the slots:

<!-- HomePage.vue -->
<template>
  <base-layout>
    <template #header>
      <h1>Here is the page title</h1>
    </template>

    <p>This is some main content for the page...</p>

    <template #footer>
      <p>Here is some footer content</p>
    </template>
  </base-layout>
</template>

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

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

In the HomePage component, we're using the BaseLayout component and providing content for the slots.

Notice the new v-slot shorthand # used for defining slots in Vue 3. <template #header> is equivalent to <template v-slot:header> in Vue 2.

The <template> tag is a placeholder element that doesn't get rendered to the DOM itself. It's only used to apply directives to its content or slots in this case.

That's a basic introduction to using slots in Vue 3. Slots are a powerful tool for creating reusable components and can get much more complex with the use of scoped slots, which allow you to pass data from the child component back up to the parent.

Vue 3.0 Scoped Slots:
- Description: Scoped slots allow parent components to pass data to child components for rendering.
- Code Example:
```

<template>
  <ChildComponent v-slot="{ data }">
    {{ data }}
  </ChildComponent>
</template>
```

Vue 3.0 Slot Usage Examples:

Code Example:

<!-- ParentComponent.vue -->
<template>
  <ChildComponent>
    <div>Slot Content</div>
  </ChildComponent>
</template>

Vue 3.0 Slot Props:

Description: Slot props allow passing data to slot content.

Code Example:

<!-- ChildComponent.vue -->
<template>
  <div>
    <slot :data="slotData"></slot>
  </div>
</template>

<!-- ParentComponent.vue -->
<template>
  <ChildComponent v-slot="{ data }">
    {{ data }}
  </ChildComponent>
</template>

Dynamic Components in Vue 3.0:

Code Example:

<component :is="currentComponent"></component>

Named Slots in Vue 3.0:

Code Example:

<template>
  <BaseLayout>
    <template #header>
      <Header />
    </template>
    <template #footer>
      <Footer />
    </template>
  </BaseLayout>
</template>

Composition API in Vue 3.0:

Description: Composition API allows organizing component logic using functions.

Code Example:

<script>
import { ref, computed } from 'vue';

export default {
  setup() {
    const count = ref(0);
    const doubleCount = computed(() => count.value * 2);

    return { count, doubleCount };
  },
};
</script>

Vue 3.0 v-slot Directive:

Code Example:

<template>
  <BaseLayout v-slot="{ header, footer }">
    <Header :data="header" />
    <Footer :data="footer" />
  </BaseLayout>
</template>

Vue 3.0 Slot Content Distribution:

Code Example:

<template>
  <BaseLayout>
    <Header />
    <Content />
    <Footer />
  </BaseLayout>
</template>

Vue 3.0 Slot Fallback Content:

Code Example:

<template>
  <BaseLayout>
    <template #default>
      Fallback Content
    </template>
  </BaseLayout>
</template>

Vue 3.0 slot-scope Usage:

Code Example:

<template>
  <BaseList v-slot="{ items }">
    <ul>
      <li v-for="item in items">{{ item.text }}</li>
    </ul>
  </BaseList>
</template>

Vue 3.0 Slot Change Detection:

Description: Vue 3.0 automatically re-renders components when slot content changes.

Example:

<template>
  <BaseLayout>
    <template #header>
      <Header :key="headerKey" />
    </template>
  </BaseLayout>
</template>

<script>
export default {
  data() {
    return {
      headerKey: 1,
    };
  },
  methods: {
    updateHeader() {
      this.headerKey += 1;
    },
  },
};
</script>

Transition Effects with Slots in Vue 3.0:

Code Example:

<transition name="fade">
  <slot></slot>
</transition>

/* CSS for the fade transition */
.fade-enter-active, .fade-leave-active {
  transition: opacity 0.5s;
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}