How can I share data between non parent-child components in Vue

Question

I have 3 components (get-users, get-projects, get-tasks) - each contains a button which fires an ajax request to retreive some data. I want the data returned from the ajax r

Answer 1

Note: this answer is only valid for vue 1

You could do a broadcast from the root Vue instance for example. this.$root gives you access to the root component in your current vue instance. Thus it will reach at its children:

<script>
export default {
    template: require('./get_users.template.html'),

    data: function() {
        return {
            userList: ''
        }
    },

    methods: {
        getUsers(e) {
            e.preventDefault();

               this.$http.get('api/getusers').then(function (response) {
                    this.userList = response.data.users;
                    this.$root.broadcast('show-results:users', { users: response.data.users });
            })
        }
    }
}
</script>

Then you listen for the show-results:users event in your show-results component:

events: {
    'show-results:users': function(data) {
        // do your stuff here
    }
}

Of course you can give the event any name you want to.

Answer 2

Use this small plugin if you want to share data between a lot of nested components:

Vue.use(VueGlobalVariable, {
  globals: {
    user: new User('testuser'),
    ....
  },
});

use $user in any component!

Answer 3

With Vue 2.0 things are bit different as broadcast has been deprecated. Vue documentation talks about using centralized event bus to accomplish this. Here's how you could it;

1. Define centralized event hub. So in your The Vue instance/decalaration define

   const eventHub = new Vue() // Single event hub
   
   // Distribute to components using global mixin
   Vue.mixin({
       data: function () {
           return {
               eventHub: eventHub
           }
       }
   })
   

2. Now in your component you can emit events with

   this.eventHub.$emit('show-results:users', { users: response.data.users })
   

3. And to listen you do

   this.eventHub.$on('show-results:users', data => {
   // do your thing
   })