Accessing deeply nested components in VueJS

This article explores two advanced patterns for accessing deeply nested components: nested slots and the composition store.

1. Nested Slots: Nested slots enable the creation of highly customisable and reusable components. By using scoped slots, you can pass data and functions from parent to child components. This approach is particularly useful for complex UIs where different parts of the component tree need to communicate or share state.

<!-- GrandchildComponent.vue -->
<template>
    <div>
        <slot>This is the text that is going to be
               replaced by the grandparent component
        </slot>
    </div>
</template>

<!-- ChildComponent.vue -->
<template>
    <grandchild-component>
        <template v-slot>
                <slot name="grandchild-component-slot"></slot>
        </template>
    </grandchild-component>
</template>

<!-- ParentComponent.vue -->
<template>
  <ChildComponent>
    <template v-slot:grandchild-component-slot>
      This is going to replace the text in the grandchild component
    </template>
  </ChildComponent>
</template>

Here, ChildComponent exposes a slot that ParentComponent can use to render GrandChildComponent, passing data down the chain.

2. Composition Store: The composition store pattern centralizes state management using Vue's Composition API. This pattern is similar to Vuex but allows for more modular and granular state management within components.

// useStore.js
import { reactive } from 'vue';

const state = reactive({
  data: null,
});

export function useStore() {
  return {
    state,
    setData(newData) {
      state.data = newData;
    },
  };
}

Components can import this store and interact with it to share state and actions:

import { useStore } from './useStore';

export default {
  setup() {
    const store = useStore();
    return { store };
  },
};

Conclusion

These advanced component composition patterns in Vue.js—nested slots and composition store— enhance the framework's flexibility and power, allowing for the creation of elegant, maintainable, and scalable applications. I will be updating this article as much as I can.