search
HomeWeb Front-endVue.jsHow to use getCurrentInstance in Vue3 with ts
How to use getCurrentInstance in Vue3 with tsMay 15, 2023 pm 10:37 PM
vue3tsgetcurrentinstance

getCurrentInstance is used in combination with ts

In the vue3 project, it is okay to use it without ts

const { proxy } = getCurrentInstance()

If used in ts, an error will be reported: Error:... Type "ComponentInternalInstance | null”

We generally use many getCurrentInstance() methods in our projects, and encapsulate them directly

Create useCurrentInstance.ts file:

import { ComponentInternalInstance, getCurrentInstance } from 'vue'
export default function useCurrentInstance() {
    const { appContext } = getCurrentInstance() as ComponentInternalInstance
    const proxy = appContext.config.globalProperties
    return {
        proxy
    }
}

Use within the component:

<script lang="ts">
import { defineComponent } from "vue";
import useCurrentInstance from "@/utils/useCurrentInstance";
export default defineComponent({
  setup() {
    const { proxy } = useCurrentInstance();
    console.log(proxy);
  },
});
</script>

vue3 ts reports an error when using getCurrentInstance

There is no this in vue3 Various api methods

Vue3 provides methods to create instances similar to this.

const instance = getCurrentInstance() 

const a1= getCurrentInstance();
a1.$toast({type: &#39;error&#39;, text: &#39;登录失败&#39; });

This is only suitable for local debugging. An error will be reported when running online. The error details are:

The attribute "proxy" does not exist on the type "ComponentInternalInstance | null". ts(2339)

Then this error will be reported below

Unsafe member access .$axios on an `any` value. eslint@typescript-eslint/no-unsafe-member- access

Unsafe call of an `any` typed value. eslint@typescript-eslint/no-unsafe-call

Reason:

## The return type of #getCurrentInstance() is null, so just add an assertion here.

Add ? after proxy to filter null results, that is:

const instance = getCurrentInstance()?.proxy  
 instance ?.$toast(&#39;请xxx!&#39;)

The above is the detailed content of How to use getCurrentInstance in Vue3 with ts. For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:亿速云. If there is any infringement, please contact admin@php.cn delete
分享两个可以绘制 Flowable 流程图的Vue前端库分享两个可以绘制 Flowable 流程图的Vue前端库Sep 07, 2022 pm 07:59 PM

前端有没有现成的库,可以直接用来绘制 Flowable 流程图的?下面本篇文章就跟小伙伴们介绍一下这两个可以绘制 Flowable 流程图的前端库。

vue是前端css框架吗vue是前端css框架吗Aug 26, 2022 pm 07:37 PM

vue不是前端css框架,而是前端JavaScript框架。Vue是一套用于构建用户界面的渐进式JS框架,是基于MVVM设计模式的前端框架,且专注于View层。Vue.js的优点:1、体积小;2、基于虚拟DOM,有更高的运行效率;3、双向数据绑定,让开发者不用再去操作DOM对象,把更多的精力投入到业务逻辑上;4、生态丰富、学习成本低。

聊聊Vue3+qrcodejs如何生成二维码并添加文字描述聊聊Vue3+qrcodejs如何生成二维码并添加文字描述Aug 02, 2022 pm 09:19 PM

Vue3如何更好地使用qrcodejs生成二维码并添加文字描述?下面本篇文章给大家介绍一下Vue3+qrcodejs生成二维码并添加文字描述,希望对大家有所帮助。

手把手带你利用vue3.x绘制流程图手把手带你利用vue3.x绘制流程图Jun 08, 2022 am 11:57 AM

利用vue3.x怎么绘制流程图?下面本篇文章给大家分享基于 vue3.x 的流程图绘制方法,希望对大家有所帮助!

一文深入详解Vue路由:vue-router一文深入详解Vue路由:vue-routerSep 01, 2022 pm 07:43 PM

本篇文章带大家详解Vue全家桶中的Vue-Router,了解一下路由的相关知识,希望对大家有所帮助!

手把手带你使用Vue开发一个五子棋小游戏!手把手带你使用Vue开发一个五子棋小游戏!Jun 22, 2022 pm 03:44 PM

本篇文章带大家利用Vue基础语法来写一个五子棋小游戏,希望对大家有所帮助!

通过9个Vue3 组件库,看看聊前端的流行趋势!通过9个Vue3 组件库,看看聊前端的流行趋势!May 07, 2022 am 11:31 AM

本篇文章给大家分享9个开源的 Vue3 组件库,通过它们聊聊发现的前端的流行趋势,希望对大家有所帮助!

手把手带你了解VUE响应式原理手把手带你了解VUE响应式原理Aug 26, 2022 pm 08:41 PM

本篇文章我们来了解 Vue2.X 响应式原理,然后我们来实现一个 vue 响应式原理(写的内容简单)实现步骤和注释写的很清晰,大家有兴趣可以耐心观看,希望对大家有所帮助!

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Tools

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools