Clear Nuxt data cache: clearNuxtData

title: Clear Nuxt Data Cache: clearNuxtData
date: 2024/8/6
updated: 2024/8/6
author: cmdragon

excerpt:
Abstract: This article describes in detail the clearNuxtData method in the framework, which is used to clear the data, error status and pending promises cached by useAsyncData and useFetch to realize real-time data updating and reloading. Through practical examples to show how to apply clearNuxtData in different pages to improve user experience and data freshness, including method signature, usage scenarios and specific code implementation steps.

categories:

front-end development

tags:

Nuxt
(computing) cache
digital
removals
subassemblies
refresh (computer window)
routing (in computer networks)

scanningtwo-dimensional barcodeFollow or microsoft search:Programming Intelligence Front-End to Full-Stack Communication and Growth

In theuseAsyncData cap (a poem)useFetch are two very commonly used combinators for fetching data from the server and displaying it in a component. If you are using these two combinators in your application, you may need a way to clear data that has been cached, especially when routes are switched or data is updated.

What is it?`clearNuxtData`？

clearNuxtData is a program for deletinguseAsyncData cap (a poem)useFetch method for cached data, error states, and pending promises. This method makes it easy for developers to invalidate or reload certain data when they want to.

method signature

clearNuxtData(keys?: string | string[] | ((key: string) => boolean)): void

keys: one or more of the following in theuseAsyncData The key used in to specify which cached data to clear. If you do not provide thekeysIf you do not want to use it, it will clear all the cached data.

Usage Scenarios

When you need to re-fetch data from a page.
When you route switch, you want the data on the new page to reload.
When you want to clear specific cached data to avoid the impact of old data on users.

Example: How to use`clearNuxtData`

Here's a simple application example showing how to use theclearNuxtData。

Creating Nuxt Applications

First, make sure you have created and set up a Nuxt application. If you haven't, you can create a new project using the following command.

npx nuxi@latest init my-nuxt-app

Go to the project catalog:

cd my-nuxt-app

1. Installation of dependencies

Make sure you have the Nuxt dependencies installed in your project.

2. Utilization`useAsyncData` Getting data

existpages/ In this case, we will use theuseAsyncData Get some data.

<template>
  <div>
    <h1>home page (of a website)</h1>
    <button @click="reloadData">Reload data</button>
    <ul>
      <li v-for="item in data" :key="">{{ }}</li>
    </ul>
  </div>
</template>

<script setup>

const { data, refresh } = await useAsyncData('my-data-key', async () => {
  const response = await fetch('/users')
  return await ()
})

const reloadData = () => {
  // removals'My Data Keys'caches
  clearNuxtData('my-data-key')
  // Reload data
  refresh()
}
</script>

In the above example, we defined a button for reloading data.reloadData method, we first pass theclearNuxtData clearedmy-data-key of the cached data and then call therefresh method to reload the data.

3. Create another page

We can create a new page likepages/This page will also use the same data.

<template>
  <div>
    <h1>About Page</h1>
    <div>
      <h2>user list</h2>
      <ul>
        <li v-for="item in data" :key="">{{ }}</li>
      </ul>
    </div>
    <button @click="reloadData">Reload data</button>
  </div>
</template>

<script setup>

const { data, refresh } = await useAsyncData('my-data-key', async () => {
  const response = await fetch('/users')
  return await ()
})

const reloadData = () => {
  clearNuxtData('my-data-key')
  refresh()
}
</script>

Here. also calls theclearNuxtData cap (a poem)refreshto ensure that the most up-to-date data is available when the Reload button is clicked.

4. Running the application

Run the application in the project root directory:

npm run dev

Open your browser and visithttp://localhost:3000, you should be able to see the home page and the about page, each of which can load data individually and refresh the data when needed.

summarize

clearNuxtData Provides a simple but effective way to manage data caching and state. This will be useful when you need to control data invalidation or refetch data. With the examples above, you can start using theclearNuxtDatato improve user experience and data freshness.

For the rest of the article, please click to jump to the personal blog page or scan the code to follow or WeChat search:Programming Intelligence Front-End to Full-Stack Communication and Growth, read the full article:Clear Nuxt Data Cache: clearNuxtData | cmdragon's Blog

Past articles are archived:

Clearing processed errors with clearError | cmdragon's Blog
Dynamically Adding Middleware with addRouteMiddleware | cmdragon's Blog
Blocking Navigation with abortNavigation | cmdragon's Blog
HTTP request using $fetch | cmdragon's Blog
Managing Responsive State with useState | cmdragon's Blog
Optimize your website for SEO with useServerSeoMeta | cmdragon's Blog
SEO Configuration with useSeoMeta | cmdragon's Blog
Must Read: Runtime Configuration Made Easy with useRuntimeConfig | cmdragon's Blog
Route Management: The useRouter Method and Routing Middleware Applications | cmdragon's Blog
UseRoute Function Details and Examples | cmdragon's Blog
Accessing a request URL using the useRequestURL combinatorial function | cmdragon's Blog
Configuring and Using Environment Variables | cmdragon's Blog
Data fetching in server-side rendering: combining useRequestHeaders and useFetch | cmdragon's Blog
Accessing Request Events with the useRequestEvent Hook | cmdragon's Blog
Efficient Data Acquisition and Management with useNuxtData | cmdragon's Blog
Nuxt 3 User Guide: Getting to grips with useNuxtApp and the runtime context | cmdragon's Blog
Asynchronous Data Fetching with useLazyFetch | cmdragon's Blog