useRelation

Intro

Establish the association relationship between parent and child components, perform data communication and method invocation, based on provide and inject implementation.

Usage

Basic Usage

Use useChildren in parent to associate child components:

import { ref } from 'vue';
import { useChildren } from '@vant/use';

const RELATION_KEY = Symbol('my-relation');

export default {
  setup() {
    const { linkChildren } = useChildren(RELATION_KEY);

    const count = ref(0);
    const add = () => {
      count.value++;
    };

    // provide data and methods to children
    linkChildren({ add, count });
  },
};

Use useParent in child component to get the data and methods provided by parent.

import { useParent } from '@vant/use';

export default {
  setup() {
    const { parent } = useParent(RELATION_KEY);

    // use data and methods provided by parent
    if (parent) {
      parent.add();
      console.log(parent.count.value); // -> 1
    }
  },
};

API

Type Declarations

function useParent<T>(key: string | symbol): {
  parent?: T;
  index?: Ref<number>;
};

function useChildren(key: string | symbol): {
  children: ComponentPublicInstance[];
  linkChildren: (value: any) => void;
};

Return Value of useParent

Name	Description	Type
parent	Data and methods provided by parent	any
index	Index position of the current component in all child of the parent component	Ref<number>

Return Value of useChildren

Name	Description	Type
children	Component list of children	ComponentPublicInstance[]
linkChildren	Function to provide values to child	(value: any) => void

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