How to implement dynamic loading of components in Vue

How to implement dynamic loading of components in Vue

In Vue, dynamic loading of components is a very common requirement. It allows us to load components when needed based on specific business logic, thereby reducing the initial loading time and enabling better performance optimization.

Vue provides several methods to implement dynamic loading of components. Below we will introduce two of the common methods, with code examples.

1. Using asynchronous components

Vue provides the function of asynchronous components, allowing us to load components when needed. We can use the Vue.component method to define an asynchronous component, which accepts a factory function as a parameter and returns a Promise object.

Vue.component('AsyncComponent', () => import('./AsyncComponent.vue'));

In the above code example, we define an asynchronous component named AsyncComponent and use the import syntax to asynchronously load the code file of the component . Vue will automatically trigger asynchronous loading when the component needs it.

When using asynchronous components, we can use the <component></component> tag in the template to dynamically load the component. For example:

<component v-bind:is="currentComponent"></component>

In the above code, we bind the currentComponent variable to the is property of <component></component>, thus Achieve dynamic loading of different components according to needs.

2. Use the Vue.lazy method

Vue 2.6.0 version introduced the Vue.lazy method, which allows We define a lazy loading component. We can use a factory function to return a Promise object, which will load the component when resolved. Compared with asynchronous components, using the Vue.lazy method is more concise.

const AsyncComponent = Vue.lazy(() => import('./AsyncComponent.vue'))

In the above code example, we use the Vue.lazy method to define a lazy loading component named AsyncComponent.

In the template, we can use the <suspense></suspense> component to wrap the code that uses lazy loading components, and set the fallback attribute to specify the amount of time it takes to load the component. Character. For example:

<Suspense>
  <template #default>
    <AsyncComponent></AsyncComponent>
  </template>
  <template #fallback>
    <div>Loading...</div>
  </template>
</Suspense>

In the above code, we use the <suspense></suspense> component to wrap the <asynccomponent></asynccomponent> and specify a placeholder when loading symbol, that is, the fallback part. The loading placeholder is displayed until the component has finished loading.

Summary:

In Vue, we can use asynchronous components or lazy loading components to achieve dynamic loading of components. Asynchronous components are defined through the Vue.component method, while lazy loading components are defined through the Vue.lazy method. No matter which method is used, it can help us improve the performance of the application and dynamically load components according to specific needs.

The above is the introduction and code examples of dynamic loading of components in Vue. I hope to be helpful!

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