Vue.js 3.0 Tutorial

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Vue.js 3.0 Style Guide

Vue 3.0 Style Guide

Vue 3.0 handles edge cases

In Vue 3.0, several improvements have been made to handle various edge cases in a more efficient and streamlined way. In this tutorial, we'll be exploring how Vue 3.0 deals with edge cases such as:

Handling async components
Conditionally rendering components
Direct parent-child communication

Handling Async Components

Async components can be defined as a function that returns a Promise (which should resolve to a component). This allows you to render a component dynamically and only when needed.

Here's an example of an async component:

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

You can also handle loading state, error state, delay before showing the loading indicator, and timeout for when to give up trying to load the component:

const AsyncComponent = defineAsyncComponent({
  loader: () => import('./MyComponent.vue'),
  loadingComponent: LoadingComponent,
  errorComponent: ErrorComponent,
  delay: 200,
  timeout: 3000
})

Conditionally Rendering Components

Conditional rendering is straightforward with Vue 3.0's v-if, v-else-if, v-else directives. You can conditionally render different components or templates based on certain conditions.

Here's an example:

<template>
  <div v-if="isLoading">
    <loading-component />
  </div>
  <div v-else>
    <my-component />
  </div>
</template>

<script>
export default {
  data() {
    return {
      isLoading: true,
    };
  },
  mounted() {
    setTimeout(() => {
      this.isLoading = false;
    }, 2000);
  },
};
</script>

In this example, the loading-component will show while isLoading is true. Once isLoading becomes false, my-component will render instead.

Direct Parent-Child Communication

In Vue 3.0, you can use provide and inject for direct parent-child communication. This can be particularly useful when you have deeply nested components and you want to avoid 'prop drilling'.

Here's an example:

// ParentComponent
export default {
  provide() {
    return {
      color: 'red',
    };
  },
  // ...
}

// ChildComponent
export default {
  inject: ['color'],
  // ...
}

In this example, the parent component provides a color property, and the child component injects it, making it available to use directly.

Remember to handle these edge cases properly in Vue 3.0 to build resilient and efficient applications. Understanding and using these features effectively can help improve your Vue.js development experience.