Having trouble adding global method using Plugin in Vue 3?

Question

Having trouble adding global method using Plugin in Vue 3?

I have been working on creating a method that can generate local image URLs to be used in any template automatically.

However, I encountered an issue while trying to develop a plugin that adds a global property.

Plugin Implementation:

// src/plugins/urlbuilder.js
export default {
    install: (app) => {
        app.config.globalProperties.buildImageUrl = imageName => require('@/assets/images/' + imageName);
    }
}

Main.js Configuration:

// src/main.js
import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import urlbuilder from './plugins/urlbuilder.js'

createApp(App).use(router).use(urlbuilder).mount('#app')

Home View – Image Rendering:

// src/views/Home.vue
<template>
    <img :src="buildImageUrl('myimage.jpg')">
</template>

Unfortunately, when attempting to render the image, I encountered the following error in the console:

Uncaught (in promise) TypeError: _ctx.buildImageUrl is not a function
    at Proxy.render (cjs.js?!./node_modules/babel-loader/lib/index.js!./node_modules/vue-loader-v16/dist/templateLoader.js?!./node_modules/cache-loader/dist/cjs.js?!./node_modules/vue-loader-v16/dist/index.js?!./src/views/Home.vue?vue&type=template&id=fae5bece&scoped=true:57)
    at renderComponentRoot (runtime-core.esm-bundler.js:922)
    ...

Note: While it works by directly adding a global property without using a plugin, I have read that the recommended approach is to use a plugin.

In conclusion, the manual setup below works successfully:

app = createApp(App)

app.config.globalProperties.buildImageUrl = imageName => require('@/assets/images/' + imageName)

app.use(router).mount('#app')

What could potentially be going wrong with my current implementation?

javascript vue.js vuejs3

Answer 1

Answer №1

If you want to access global properties, you can do so using the following method:

  const instance = getCurrentInstance()
  const globalProperties = instance.appContext.config.globalProperties
  console.log(globalProperties)

It is recommended to use provide and inject.

Alternatively, you can create a hook file:

useGlobalProps.ts

import { getCurrentInstance } from 'vue'
import type { ComponentInternalInstance } from 'vue'

function useGlobalProps() {
  const { appContext } = getCurrentInstance() as ComponentInternalInstance
  const globalProps = appContext.config.globalProperties
  return { ...globalProps }
}

export default useGlobalProps

Then, you can use this hook in your component:

import useGlobalProps  from '@/hooks/useGlobalProps'
const { testFn, globalFn } = useGlobalProps()
testFn()
globalFn('global function in main.js')

Don't forget to register globalFn in your main.js file:

app.config.globalProperties.globalFn = function testGlobal(name: string) {
  console.log(name)
}

You can also register testFn through a plugin:

myPlugin.js

export default function (app: App<HTMLElement>) {
  app.config.globalProperties.testFn = () => {
    console.log('install global properties')
  }
  return app
}

Lastly, make sure to use this plugin in your main.js file:

import myPlugin from './myPlugin.js'
// ...
app.use(myPlugin)

Answer 2

If you want to access global properties, you can do so using the following method:

  const instance = getCurrentInstance()
  const globalProperties = instance.appContext.config.globalProperties
  console.log(globalProperties)

It is recommended to use provide and inject.

Alternatively, you can create a hook file:

useGlobalProps.ts

import { getCurrentInstance } from 'vue'
import type { ComponentInternalInstance } from 'vue'

function useGlobalProps() {
  const { appContext } = getCurrentInstance() as ComponentInternalInstance
  const globalProps = appContext.config.globalProperties
  return { ...globalProps }
}

export default useGlobalProps

Then, you can use this hook in your component:

import useGlobalProps  from '@/hooks/useGlobalProps'
const { testFn, globalFn } = useGlobalProps()
testFn()
globalFn('global function in main.js')

Don't forget to register globalFn in your main.js file:

app.config.globalProperties.globalFn = function testGlobal(name: string) {
  console.log(name)
}

You can also register testFn through a plugin:

myPlugin.js

export default function (app: App<HTMLElement>) {
  app.config.globalProperties.testFn = () => {
    console.log('install global properties')
  }
  return app
}

Lastly, make sure to use this plugin in your main.js file:

import myPlugin from './myPlugin.js'
// ...
app.use(myPlugin)

Answer 3

Answer №2

An improved method involves utilizing provide and inject in Vue.js

import urlbuilder from './plugins/urlbuilder.js'

app.provide('$urlbuilder', urlbuilder);

For further information, refer to provide and inject documentation

Answer 4

An improved method involves utilizing provide and inject in Vue.js

import urlbuilder from './plugins/urlbuilder.js'

app.provide('$urlbuilder', urlbuilder);

For further information, refer to provide and inject documentation

Having trouble adding global method using Plugin in Vue 3?

Answer №1

Answer №2

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