Vue3 sample code for elegantly handling asynchronous component loading using Suspense

introduction

Vue3 is the latest version, which brings many exciting new features and improvements. One of the important features is Suspense, which provides us with an elegant way to handle asynchronous component loading and error handling.

Introduction to Suspense

Suspense is a newly added component in Vue3. It can be used to handle waiting states and error states during asynchronous component loading. In traditional Vue development, we usually use v-if or v-show to control the display and hiding of components, but this method is not friendly to the waiting state and error handling when loading asynchronous components. Suspense provides a more elegant and concise way to deal with these situations.

In Vue3, Suspense is implemented by combining <template v-slot> and <Suspense> components. When an asynchronous component is loaded, <template v-slot> displays a placeholder and replaces it with the actual content after the asynchronous component is loaded. If the asynchronous component fails to load, the error message can be displayed via <template v-slot>.

usage

Using Suspense is very simple, just wrap the components that need to be loaded asynchronously in<Suspense>Just in the label. Here is a basic example:

<template>
  <Suspense>
    <template v-slot:default>
      <!-- Placeholder when asynchronous component loading -->
      <div>Loading...</div>
    </template>
    <template v-slot:error>
      <!-- Error message when asynchronous component fails to load -->
      <div>Failed to load component.</div>
    </template>
    <AsyncComponent />
  </Suspense>
</template>

<script>
import { defineAsyncComponent } from 'vue';

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

export default {
  components: {
    AsyncComponent
  }
};
</script>

In the example above,<Suspense>Packed with label<AsyncComponent>and use<template v-slot:default>and<template v-slot:error>To define placeholders and error messages when asynchronous component loading. When the asynchronous component is loaded, the placeholder is replaced with the actual content.

Example of usage scenario

Asynchronous component loading

<template>
  <Suspense>
    <template v-slot:default>
      <!-- Placeholder when asynchronous component loading -->
      <div>Loading...</div>
    </template>
    <AsyncComponent />
  </Suspense>
</template>

<script>
import { defineAsyncComponent } from 'vue';

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

export default {
  components: {
    AsyncComponent
  }
};
</script>

In the above example, when<AsyncComponent>When loaded, a placeholder of "Loading..." will be displayed. When the asynchronous component is loaded, the placeholder is replaced with the actual content.

Asynchronous component loading failure handling

<template>
  <Suspense>
    <template v-slot:default>
      <!-- Placeholder when asynchronous component loading -->
      <div>Loading...</div>
    </template>
    <template v-slot:error>
      <!-- Error message when asynchronous component fails to load -->
      <div>Failed to load component.</div>
    </template>
    <AsyncComponent />
  </Suspense>
</template>

<script>
import { defineAsyncComponent } from 'vue';

const AsyncComponent = defineAsyncComponent(() =>
  import('./').catch(() => {
    throw new Error('Failed to load component.');
  })
);

export default {
  components: {
    AsyncComponent
  }
};
</script>

In the example above, when loading fails, an error message "Failed to load component." is displayed.

Summarize

Vue3 Suspense is a very useful feature that provides an elegant way to handle asynchronous component loading and error handling. By combining<template v-slot>and<Suspense>Components, we can easily implement the waiting state and error state when asynchronous component loading.

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