Vue & Laravel: Access and use eventHub - laravel

Question

In resources/assets/js/app.js I have created eventHub Vue instance:
require('./bootstrap');
var eventHub = new Vue();
Vue.component('todos-list', require('./components/todos/TodoList.vue'));
Vue.component('todos-add', require('./components/todos/TodoAdd.vue'));
const app = new Vue({
el: '#app'
});
How can I use it in components that are created in separate .vue files?
For example, I also have two components:
todos-list located in /components/todos/TodoList.vue, which is used to fetch the data from server-side using vue-resource:
<template id="todos-list-template">
<div>
<ul v-if="todos.length > 0">
<li v-for="todo in todos">
{{ todo.title }}
</li>
</ul>
<p v-else>You don't hanve any Todos.</p>
</div>
</template>
<script>
export default {
template: '#todos-list-template',
data() {
return {
todos: {}
}
},
mounted() {
this.$http.get('api/vue/todos').then(function(response) {
this.todos = response.data;
});
},
methods: {
handleAddedTodo: function(new_todo) {
this.todos.push(new_todo);
}
},
created: function() {
eventHub.$on('add', this.handleAddedTodo);
},
destroyed: function() {
eventHub.$off('add', this.handleAddedTodo);
}
}
</script>
todos-add located in /components/todos/TodoAdd.vue which is used to add (save) the new 'todo' using vue-resource:
<template id="todos-add-template">
<div>
<form v-on:submit.prevent="addNewTodo()">
<div class="form-group">
<input v-model="newTodo.title" class="form-control" placeholder="Add a new Todo">
</div>
<div class="form-group">
<button>Add Todo</button>
</div>
</form>
</div>
</template>
<script>
export default {
template: '#todos-add-template',
data() {
return {
newTodo: { id: null, title: this.title, completed: false }
}
},
methods: {
addNewTodo() {
this.$http.post('api/vue/todos', { title: this.newTodo.title }).then(function(response) {
if (response.status == 201) {
eventHub.$emit('add', response.data);
this.newTodo = { id: null, title: this.title, completed: false }
}
}, function(response) {
console.log(response.status + ' - '+ response.statusText);
})
}
}
}
</script>
When I add (save) new 'todo' using the todos-add component (TodoAdd.vue) - I want to update data in todos-list component. If I understood well the documentation - for component communication we need to use centralized event hub. And that's what I tried - but I am getting the following error:
eventHub is not defined
I guess because it is defined in app.js, but how can I use in components that are created in separate .vue files?

Answer 1

You are getting this error because eventHub is actually not defined where you are using it. You have to export this from app.js and import in TodoAdd.vue.
in app.js:
var eventHub = new Vue()
exports.eventHub = eventHub
Add this code in TodoAdd.vue:
<script>
import eventHub from '/path/of/app'
export default {
template: '#todos-list-template',
This should make eventHub availble in TodoAdd.vue.
Edited
As the comment suggests, you may consider using vuex, as you have data whcih is being used across components, and going forward I see chances of getting it more complex, more event handlers and event listerners, which can quickly become a nightmare to manage.

Answer 2

var eventHub = new Vue()
You are getting this error because eventHub is actually not defined where you are using it. You have to export this from app.js file. Use this one
window.eventHub = new Vue()