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Managing responsive state with useState

Popularity：298 ℃/2024-08-01 12:08:18

title: Managing responsive state with useState
date: 2024/8/1
updated: 2024/8/1
author: cmdragon

excerpt:
Abstract: This article describes in detail how to use useState for responsive state management in the Nuxt3 framework, including its basic concepts, advantages, usage, shared state implementation, and performance optimization techniques. useState supports server-side rendering (SSR), and can be used to create responsive state and share it among components, and shows its basic usage, how to share state among multiple components, and how to improve performance using allowRef, with specific examples. The following examples show the basic usage of useState, how to share state among multiple components, and how to use allowRef to improve performance.

categories:

  • front-end development

tags:

  • Nuxt3
  • useState
  • SSR
  • Status Management
  • subassemblies
  • responsive
  • shared state

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In the Nuxt3 framework, theuseState
is a powerful tool for creating responsive state and supporting server-side rendering (SSR). It allows you to manage state in your components and share that state between client and server side. Here is a detailed tutorial to help the novice user understand how to use theuseState。

What is it?useState？

useState
is a composite function for creating responsive state. It can be used in components, allows you to share state throughout your application, and supports server-side rendering. It can be used to create responsive state via theuseState
The state created is consistent across the different lifecycles of the component and can automatically respond to changes in state.

Why useuseState？

1. Responsive state management

useState The state created is responsive, which means that when the state changes, the associated component is automatically re-rendered. This way, you can easily manage and update the state of your components without having to manually deal with the
DOM Update.

2. Server-side rendering support

useState Support for server-side rendering (SSR) means that you can pre-generate state on the server side and then pass it to the client. This improves page loading performance and ensures consistent state on both the client and server side.

3. Shared status

useState Allows you to share state between multiple components. By defining state as global, you can easily access and update the same state in different parts of your application.

How to useuseState？

basic usage

useState can be used to create responsive states and set default values. The following is a simple example:


<template>
  <div>
    <p> counter value: {{ count }}</p>
    <button @click="increase"> increase</button>
  </div>
</template>

<script setup lang="ts">

  // Create a responsive state and set the default value to 0
  const count = useState('counter', () =>0);

  // Function to increment the value of the counter
  const increment = () => {
    ++;
  };
</script>

In this example, we use theuseState creates a file namedcount responsive state and set its initial value to 0. When the user clicks the button, theincrement
function will increase thecount value, the component automatically updates to display the new counter value.

shared state

useState Allows you to share state between different components. Below is an example showing how to share the same state across multiple components:


<template>
  <div>
    <p>counter value：{{ count }}</p>
    <button @click="increment">rise</button>
  </div>
</template>

<script setup lang="ts">

  // Use the same key to share state
  const count = useState('sharedCounter', () => 0);

  const increment = () => {
    ++;
  };
</script>



<template>
  <div>
    <p> Counter value display: {{ count }}</p>
  </div>
</template>

<script setup lang="ts">;

  // Use the same key to share state
  const count = useState('sharedCounter');
</script>

In this example, the cap (a poem) Both use the same status key'sharedCounter'. In this way, when
When the counter value in the The component is also automatically updated to display the latest counter values.

utilizationshallowRef improve performance

When the state contains large objects or arrays, you may wish to use theshallowRef to improve performance.shallowRef Allows you to create shallow responsive state, thus avoiding deep responsive updates.

Example: UsingshallowRef


<template>
  <div>
    <p>{{ }}</p>
    <button @click="updateDeep">update</button>
  </div>
</template>

<script setup lang="ts">

  // utilization shallowRef Creating shallow responsive state
  const state = useState('shallowState', () => shallowRef({deep: '未update'}));

  const updateDeep = () => {
     = '已update';
  };
</script>

In this example, we use theshallowRef A state containing large objects is created.shallowRef Responsive processing of only references to objects, without deeper responsive processing of the internal properties of the object.

Parameter description

  • key: A unique key for the status. Ensures that the data is properly de-emphasized in the request. If the key is not provided, it will be used for theuseState instance generates a unique key.
  • init: A function that provides the initial value of the state when the state is not initialized. This function can also return aRef。
  • T: The type of the state (TypeScript only).

summarize

useState is a powerful tool for creating responsive state in Nuxt3 and supporting server-side rendering. This is accomplished by using theuseState
You can share state between components, improve application performance, and simplify state management.

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:Managing Responsive State with useState | cmdragon's Blog

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