Vue component remains unrecognized even after registration

I'm attempting to create a nested component structure like this:

<prompt :users="users">
...
  <dataset v-for="ds in users" :user="user"></dataset>
...
</prompt>

However, it seems that I'm encountering an issue with registering the component correctly:

[Vue warn]: Unknown custom element: <dataset> - have you properly registered the component? For recursive components, ensure the "name" option is provided. 
(found in root instance)

This is how I am trying to register the component:

In app.js:

Vue.component('prompt', {
    props: ['userdata', 'users'],
    template: '#prompt-template',    
    components: {
        'dataset': {
            props: ['userdataset', 'user'],
            template: '#dataset-template',
        }        
    }
});

Finally, here are the templates being utilized:

 <template id="dataset-template">
      <li>{{ user}}</li>
  </template>

  <template id="prompt-template">
      <transition name="modal">
          <div class="modal-mask">
              <div class="modal-wrapper">
                  <div class="modal-container">

                      <div class="modal-header">
                          <slot name="header">
                              default header
                          </slot>
                      </div>

                      <div class="modal-body">
                          <slot name="body">

                          </slot>
                      </div>

                      <div class="modal-footer">
                          <slot name="footer">
                              default footer
                              <button class="modal-default-button" @click="$emit('close')">
                                  OK
                              </button>
                          </slot>
                      </div>
                  </div>
              </div>
          </div>
      </transition>
  </template>

Can someone point out any steps or details that may be missing from my implementation? It's unclear to me why the component registration isn't functioning as expected.

Answer №1

The issue arises when the dataset component is used as a slot inside the prompt component. As the Vue vm traverses the component tree, it encounters the dataset component which it does not recognize. Subcomponents should be included in the component template and not within slots. To resolve this, you need to register the dataset component within the Vue vm just like you did for the prompt component. Here's an example:

Vue.component('promp', { ... })
Vue.component('dataset', { ... })

It's also logical to register the components at the same level since the templates of the components are registered on the same level next to each other. You can compare this to the example mentioned in another comment: In that example, the subcomponent axis-label is only utilized within the template of the parent polygraph component. This setup allows the component to properly identify its subcomponents without relying on the vue-vm.

In simpler terms:

A component should be able to pass components into the slot of any other component A, even if they are not directly related as subcomponents of A. Therefore, all components passed to slots of a component should be accessible to the Vue vm.

A general rule of thumb could be

If a component does not appear within another component's template, it should not be considered a subcomponent.

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