Question: how to declare global variable in vue js?, vue global variable undefined, how to load global variable when component instance loads vuejs?, vuejs mounted how to access global variable?

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vue global variable

Contents

In this Article, We want to share with you how to set & get global variable in vue js. so you can set(declare) and get(fetch) global variable with this data value as well as use global variable in vuejs. if you assign global variable then you can simply Retrive or access global variable in vuejs single page web application.

generally we required to get a describe data all over our app vuejs components in such phase we can create a global variable in vuejs app’s by using this best syntax with global variable this.

Vue.prototype.$variablename

what does $ mean in javascript ?

so, here where $ is a simple naming convention to assign or declare the global vuejs variables.

Declaring a global variable

In this best example, we are declare global variable a $axios variable which helps us to use the instance axios object in our vuejs components to send the server side http call or requests.

Open you main.js file and add the below code.

import Vue from 'vue'
import App from './App.vue'
import axios from 'axios'

// global variable
Vue.prototype.$axios = axios


new Vue({
  render: h => h(App),
}).$mount('#app')

Accessing global variable

We can get the global variable from any component instance by using reference global variable from instance vuejs this.$variablename.

App.vue

<template>
  <div id="app">
    <ul v-for="product in products" :key="product.id">
      <li>{{product.id}}</li>
      <li>{{product.name}}</li>
    </ul>
  </div>
</template>

<script>
export default {
  data: function() {
    return {
      products: []
    };
  },
  created: function() {
    this.$axios.get("https://jsonplaceholder.typicode.com/products")
    .then(res => {
      this.products = res.data;
    });
  }
};
</script>

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vue global variable undefined

So you can see bellow full vuejs working example:

<!DOCTYPE html>
<html>
<head>
    <title>How to declare global variable in VueJS? - Pakainfo.com</title>
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>
    
<div id="app">
    
  <p>Result : {{vueGlobalVariable}}</p>
  <button @click="clickFunction()">Click Me</button>
    
</div>
   
<script type="text/javascript">
     
    Vue.mixin({
      data: function() {
        return {
          variablename:'this is my pakainfo.com'
        }
      }
    })
 
    var app = new Vue({
      el: '#app',
      data: {
        vueGlobalVariable: ''
      },
      methods:{
        clickFunction: function () {   
            this.vueGlobalVariable = this.variablename;
        }
      }
    })
    
</script>
    
</body>
</html>

results:

Result : this is my pakainfo.com

Web Programming Tutorials Example with Demo

Read :

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Summary

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