How to use the Suspense component in Vue 3 to achieve data loading transition effects

How to use the Suspense component in Vue 3 to achieve data loading transition effects

Introduction:
As the complexity of web applications increases, the data loading transition effect becomes meets an important user experience requirement. Vue 3 has made further improvements in this area and introduced the Suspense component to solve this problem. This article will introduce how to use the Suspense component in Vue 3 to achieve data loading transition effects, and attach corresponding code examples.

1. Introducing the Suspense component
   The Suspense component in Vue 3 was introduced to solve the problem of data loading status display during the loading process of asynchronous components. We can wrap the asynchronous component by using the Suspense component in the template and display a loading state before the asynchronous component is loaded.

<template>
  <Suspense>
    <template #default>
      <AsyncComponent/>
    </template>
    <template #fallback>
      <loading-component/>
    </template>
  </Suspense>
</template>

2. Define asynchronous components
   Asynchronous components can be dynamically loaded through the import function, and Vue will automatically convert them into asynchronous components. We can display a loading state during the loading process of an asynchronous component until the component is loaded.

const AsyncComponent = defineAsyncComponent(
  () => import('./AsyncComponent.vue'),
  {
    loadingComponent: loadingComponent,
    errorComponent: errorComponent,
    delay: 200, // 延迟200毫秒显示loading状态
    timeout: 3000 // 3秒超时时间
  }
);

3. Custom loading status component
   loadingComponent and errorComponent are our custom components, which represent the status of data loading and loading failure respectively. We can customize the display effects of these two components according to actual needs. The following is a sample code for loadingComponent:

<template>
  <div class="loading">数据加载中...</div>
</template>

<script>
export default {
  name: 'loadingComponent'
}
</script>

<style scoped>
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100px;
  background-color: #f5f5f5;
}
</style>

4. Display after the component is loaded
   When the component is loaded, we can display data in the asynchronous component. At this time, Vue will automatically replace the fallback template content of the Suspense component with the content of the asynchronous component.

<template>
  <div>
    <h1>{{title}}</h1>
    <p>{{content}}</p>
  </div>
</template>

<script>
export default {
  name: 'AsyncComponent',
  data() {
    return {
      title: '',
      content: ''
    }
  },
  created() {
    fetch('/api/data')
      .then(response => response.json())
      .then(data => {
        this.title = data.title;
        this.content = data.content;
      })
      .catch(error => {
        console.error(error);
      });
  }
}
</script>

5. Complete sample code
   The following is a complete sample code that shows how to use the Suspense component in Vue 3 to achieve the data loading transition effect.

<template>
  <Suspense>
    <template #default>
      <AsyncComponent/>
    </template>
    <template #fallback>
      <loading-component/>
    </template>
  </Suspense>
</template>

<script>
import { defineAsyncComponent, Suspense } from 'vue';
import AsyncComponent from './AsyncComponent.vue';
import LoadingComponent from './LoadingComponent.vue';

export default {
  name: 'App',
  components: {
    AsyncComponent,
    LoadingComponent
  }
}
</script>

Conclusion:
The Suspense component in Vue 3 allows us to more easily implement data loading transition effects. By introducing the Suspense component, defining asynchronous components and custom loading status components, we can easily achieve the transition effect of data loading and improve user experience. I hope this article is helpful to you, thank you for reading!

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