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 Dynamic Components & Asynchronous Components

Dynamic and asynchronous components can make your Vue application more flexible and efficient. Let's dive into each:

Dynamic Components:

A dynamic component is used when you want to switch between different components at the same spot. The is special attribute is used to achieve this. It allows you to bind it to your data and change the rendered component dynamically.

<template>
  <button @click="toggle">Toggle</button>
  <component :is="currentComponent"></component>
</template>

<script>
import ComponentA from './ComponentA.vue';
import ComponentB from './ComponentB.vue';

export default {
  components: {
    ComponentA,
    ComponentB
  },
  data() {
    return {
      currentComponent: 'ComponentA'
    }
  },
  methods: {
    toggle() {
      this.currentComponent = 
        this.currentComponent === 'ComponentA' ? 'ComponentB' : 'ComponentA';
    }
  }
}
</script>

In this example, the toggle method switches currentComponent between 'ComponentA' and 'ComponentB', which in turn changes the component that gets rendered.

Asynchronous Components:

An asynchronous component is a component that is loaded only when it is needed, instead of at the initial load of the application. This can be beneficial for performance because it reduces the size of the initial JavaScript payload.

To create an asynchronous component in Vue 3, you can use the defineAsyncComponent method from the Vue library.

import { defineAsyncComponent } from 'vue'

const AsyncComponent = defineAsyncComponent(() =>
  import('./AsyncComponent.vue')
)

export default {
  components: {
    AsyncComponent
  }
}

Here, the import('./AsyncComponent.vue') function is passed to defineAsyncComponent. This function will be called the first time the AsyncComponent needs to be rendered, and it will dynamically import the component.

Note that if the component loading fails, Vue will retry loading the component when triggered next time. You can also provide error and loading components as options to defineAsyncComponent.

import { defineAsyncComponent } from 'vue'

const AsyncComponent = defineAsyncComponent({
  loader: () => import('./AsyncComponent.vue'),
  delay: 200, // default: 200ms
  timeout: 3000, // default: Infinity
  errorComponent: () => import('./ErrorComponent.vue'),
  loadingComponent: () => import('./LoadingComponent.vue'),
  onError(error, retry, fail, attempts) {
    if (error.message.includes('fetch') && attempts <= 3) {
      // retry on fetch errors, up to 3 times
      retry()
    } else {
      // Note that retry/fail are mere function arguments to onError.
      // It's up to you what to do with them. For example, you could try
      // loading a different component, which could serve as a fallback.
      fail()
    }
  }
})

export default {
  components: {
    AsyncComponent
  }
}

In the above code, ErrorComponent will be displayed if loading fails, and LoadingComponent will be displayed during load. If the loading takes longer than timeout, then loading will be considered failed. If there's an error, onError will be called.

Dynamic Component Binding in Vue 3.0: Use the is attribute for dynamic component binding.

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

data() {
  return {
    currentComponent: 'ComponentA',
  };
},

Vue 3.0 is and v-bind:is for Dynamic Components: Use is or v-bind:is to dynamically switch components.

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

data() {
  return {
    currentComponent: 'ComponentA',
  };
},

Conditional Rendering with Dynamic Components in Vue 3.0: Use conditional statements for dynamic component rendering.
```
<component :is="isCondition ? 'ComponentA' : 'ComponentB'"></component>
```

Asynchronous Component Loading in Vue 3.0: Load components asynchronously using import.

const AsyncComponent = () => import('./AsyncComponent.vue');

data() {
  return {
    currentComponent: AsyncComponent,
  };
},

Vue 3.0 Dynamic Component Transitions: Apply transitions to dynamically switched components.

<transition name="fade" mode="out-in">
  <component :is="currentComponent"></component>
</transition>

Dynamic Component Props in Vue 3.0: Pass dynamic props to dynamically switched components.
```
<component :is="currentComponent" :propName="propValue"></component>
```

Vue 3.0 Dynamic Component Lifecycle Hooks: Lifecycle hooks for dynamic components are triggered as usual.

data() {
  return {
    currentComponent: 'ComponentA',
  };
},
components: {
  ComponentA: {
    created() {
      console.log('ComponentA created');
    },
  },
},

Lazy Loading Components in Vue 3.0: Lazy load components using dynamic import for better performance.

const LazyComponent = () => import('./LazyComponent.vue');

data() {
  return {
    currentComponent: LazyComponent,
  };
},

Vue 3.0 Asynchronous Component Loading Strategies: Choose between synchronous and asynchronous loading strategies based on your app's needs.

// Synchronous loading
import SyncComponent from './SyncComponent.vue';

// Asynchronous loading
const AsyncComponent = () => import('./AsyncComponent.vue');

Vue 3.0 Dynamic and Async Component Examples: Combine dynamic and asynchronous loading for complex scenarios.

<template>
  <transition name="fade" mode="out-in">
    <component :is="currentComponent"></component>
  </transition>
</template>

<script>
const AsyncComponentA = () => import('./AsyncComponentA.vue');
const AsyncComponentB = () => import('./AsyncComponentB.vue');

export default {
  data() {
    return {
      currentComponent: AsyncComponentA,
    };
  },
  methods: {
    switchComponent() {
      this.currentComponent = this.currentComponent === AsyncComponentA ? AsyncComponentB : AsyncComponentA;
    },
  },
};
</script>