Add a new component to a Vue.js instance that is already in use

Question

Add a new component to a Vue.js instance that is already in use

Just getting started with Vue.js

I'm looking to register a local component following the instructions here:

https://v2.vuejs.org/v2/guide/components.html#Local-Registration

The catch is that I need to register the component to an existing Vue instance, not when creating a new instance like this:

const app = new Vue({
    el: '#app'
});
    
app.component({
    'my-component': {
         template: '<div>A custom component!</div>'
    }
});

I've attempted using Vue.extend for this, but it's not yielding the desired results.

Edit:

Reason behind this requirement:

I'm working on a third-party package that will contain this component. The framework where the package will be integrated already includes Vue.js and has a Vue instance. So, if I include my package's JS before the framework's JS, I get "Vue is undefined". If I include my package's JS after the framework's JS, I face component errors as it needs to be registered prior to Vue instantiation.

javascript vue.js vuejs2 vue-component

Answer 1

Answer №1

It is crucial to declare global components before constructing a new instance.

Vue.component('my-component-a', {
  template: '<div>A custom component A!</div>'
});

Vue.component('my-component-b', {
  template: '<div>A custom component B!</div>'
});

const app1 = new Vue({
    el: '#app1',
    template: '<div><my-component-a /><my-component-b /><my-component-c /></div>',
    components: {
      MyComponentC: {
        template: '<div>A custom component C!</div>'
      }
    }
});

const app2 = new Vue({
    el: '#app2',
    template: '<div><my-component-b /><my-component-a /><my-component-c /></div>'
});

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="8afcffefcab8a4bfa4bbbd">[email protected]</a>/dist/vue.js"></script>
<div id="app1"></div>
<div id="app2"></div>

The C component is not accessible within the app2 environment.

Answer 2

It is crucial to declare global components before constructing a new instance.

Vue.component('my-component-a', {
  template: '<div>A custom component A!</div>'
});

Vue.component('my-component-b', {
  template: '<div>A custom component B!</div>'
});

const app1 = new Vue({
    el: '#app1',
    template: '<div><my-component-a /><my-component-b /><my-component-c /></div>',
    components: {
      MyComponentC: {
        template: '<div>A custom component C!</div>'
      }
    }
});

const app2 = new Vue({
    el: '#app2',
    template: '<div><my-component-b /><my-component-a /><my-component-c /></div>'
});

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="8afcffefcab8a4bfa4bbbd">[email protected]</a>/dist/vue.js"></script>
<div id="app1"></div>
<div id="app2"></div>

The C component is not accessible within the app2 environment.

Answer 3

Answer №2

It's not possible to add components to an instance in that manner. The correct way is to add them to the Vue constructor as shown below:

Vue.component('my-component', {
  template: '<div>A custom component!</div>'
});

const app = new Vue({
    el: '#app'
});

Check out a live demo here: https://jsfiddle.net/uniqueurl123/

Answer 4

It's not possible to add components to an instance in that manner. The correct way is to add them to the Vue constructor as shown below:

Vue.component('my-component', {
  template: '<div>A custom component!</div>'
});

const app = new Vue({
    el: '#app'
});

Check out a live demo here: https://jsfiddle.net/uniqueurl123/

Answer 5

Answer №3

let application = new Vue({
  el: '#app',
  components: {
    'custom-component': {template: '<div>Content inside the component</div>'}
   }
});

Answer 6

let application = new Vue({
  el: '#app',
  components: {
    'custom-component': {template: '<div>Content inside the component</div>'}
   }
});

Answer 7

Answer №4

Essentially, it is not possible to register a component with an existing Vue instance once it has already been rendered. However, you can register a component before the Vue instance is mounted onto the DOM element.

// local component
var child = {
  template: '<div>A custom component!</div>'
}

const app = new Vue({
   el: '#app',
   components: {
     Child: child
  }
})

or

// global component
Vue.component({
 'child': {
   template: '<div>A custom component!</div>'
 } })

Remember to define the component first and then proceed with its implementation.

Answer 8

Essentially, it is not possible to register a component with an existing Vue instance once it has already been rendered. However, you can register a component before the Vue instance is mounted onto the DOM element.

// local component
var child = {
  template: '<div>A custom component!</div>'
}

const app = new Vue({
   el: '#app',
   components: {
     Child: child
  }
})

or

// global component
Vue.component({
 'child': {
   template: '<div>A custom component!</div>'
 } })

Remember to define the component first and then proceed with its implementation.

Add a new component to a Vue.js instance that is already in use

Answer №1

Answer №2

Answer №3

Answer №4

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