How to utilize Vue.js method to retrieve child prop?

In my Vue.js project, I have created two components. The main component uses a child component called NoteRenderer, which includes a prop named data_exchange. My goal is to update this prop from the main component when a button is clicked. I attempted to achieve this by writing the following code:

<template>
    <div>
        <h1>Study</h1>
         <button @click="update_nra()">Change NodeRenderer text.</button> 
    </div>
    <nra/>
    <nrb/>
</template>

<script>
import NoteRenderer from '../components/NoteRenderer.vue'

export default {
    components: {
        'nra': NoteRenderer,
        'nrb': NoteRenderer
    },
    methods: {
        update_nra: function() {
            this.nra.exchange_data = "new text";
        }
    }
}
</script>

However, upon execution, I encounter the runtime error

Uncaught TypeError: this.nra is undefined
. How can I properly access and modify the instance nra of the NoteRenderer component within the update_nra() method?

Answer №1

After noticing another answer with code but no explanation, I felt compelled to provide one here.

In Vue, properties are passed to a Component, meaning in your main component you should have a data variable where you change the value and then bind that variable as a property of the sub-component.

It's not considered best practice to access the internals of another component; instead, it's recommended to follow the Vue API.

Keep in mind that properties shouldn't be changed from within a component; the code that passes the property is responsible for any changes.

This method ensures a clear flow of data and results in cleaner code with fewer bugs that are also easier to understand.

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