by Sai gowtham

How to declare a global variable in Vue.js

In this tutorial, we are going to learn about how to declare a global variable in vuejs with the help of an example.

Sometimes we need to access a particular data throughout our app components in such cases we can create a global variable in vue.js by using this syntax.

Vue.prototype.$variablename

where $ is a naming convention to declare the global variables.

Declaring a global variable

In this example, we are declaring a $axios global variable which helps us to use the axios object in our components to send the http requests.

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

main.js
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 access the global variable from any component instance by using this.$variablename.

App.vue
<template>
  <div id="app">
    <ul v-for="user in users" :key="user.id">
      <li>{{user.id}}</li>
      <li>{{user.name}}</li>
    </ul>
  </div>
</template>

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

output:

vue-global-variable-example

Css Tutorials & Demos

How rotate an image continuously in CSS

In this demo, we are going to learn about how to rotate an image continuously using the css animations.

How to create a Instagram login Page

In this demo, i will show you how to create a instagram login page using html and css.

How to create a pulse animation in CSS

In this demo, i will show you how to create a pulse animation using css.

Creating a snowfall animation using css and JavaScript

In this demo, i will show you how to create a snow fall animation using css and JavaScript.

Top Udemy Courses

JavaScript - The Complete Guide 2022 (Beginner + Advanced)
JavaScript - The Complete Guide 2022 (Beginner + Advanced)
116,648 students enrolled
52 hours of video content
$14.99 FROM UDEMY
React - The Complete Guide (incl Hooks, React Router, Redux)
React - The Complete Guide (incl Hooks, React Router, Redux)
631,582 students enrolled
49 hours of video content
$24.99 FROM UDEMY
Vue - The Complete Guide (w/ Router, Vuex, Composition API)
Vue - The Complete Guide (w/ Router, Vuex, Composition API)
203,937 students enrolled
31.5 hours of video content
$14.99 FROM UDEMY