How can I retrieve a child method in the Vue.js 3 Options API?

When working with Vue.js 3 using the Options API, I encountered a challenge in accessing a child component's method. Although there is a solution provided for Vue.js 2 and Vue.js 3 with Composition API on How to access to a child method from the parent in vue.js, I attempted it within the parent component:

<dropdown-list @update="updateChildComponents"></dropdown-list>
<child-component-1 ref="childComponent1Ref" :url="url"></child-component-1>
<child-component-2 ref="childComponent2Ref" :url="url"></child-component-2>

and

methods: {
  updateChildComponents() {
    this.$refs.childComponent1Ref.childComponentMethod();
    this.$refs.childComponent2Ref.childComponentMethod();
  }
}
 

While this approach successfully accesses the method, I am uncertain if it is the most appropriate way to do so.

Additionally, I noticed a delay with updating a prop in the child component from the parent, which is used in the child component's method and only takes effect after the second event. I suspect these issues might be connected.

Within the child component:

props: ['url'],
methods: {
  childComponentMethod() {
    console.log(this.url); // retrieves the value from the previous event
  }
}

Your insights and guidance would be greatly appreciated.

Answer №1

To facilitate communication between the parent and child components, it is recommended to pass values using props. If the value in the parent component is dynamic and updates frequently, you should utilize watchers. This process is referred to as one-way binding because changes made in the parent component are not automatically reflected in the child component.

Parent -> Child = Use props.

Child -> Parent = Utilize emits and custom events.

<script>
import { reactive, watch, computed, onMounted } from "vue"

export default {
  components: {},
  props: { metadata: String },
  emits: [""],
  setup(props) {
    onMounted(async () => {
      // first initialization
      if (props.metadata) {
        state.metadataName = props.metadata;
      }
    });

    // track changes in the parent component
    watch(
      () => props.metadata,
      async (metadata) => {
        if (metadata) {
          // handle changes here
        }
      }
    );

    return {
     
    };
  },
};
</script>

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