Warning: When VueJs OnMount props is utilized, it might display a message stating, "Expected Object, received Undefined."

This is my current component setup:

<template>
  <Grid :items="items" />
</template>

<script setup>
  import { ref, onMounted } from 'vue'
  import Grid from '@/components/Grid.vue'
  import { getData } from '@/services/getData'

  const items = ref()

  onMounted(async () => {
    items.value = await getData()
 })
</script>

The Grid component depends on the items property to display data. However, I encounter a warning stating 

type check failed for prop "items". Expected Object, got Undefined
. This occurs because items is undefined before getData() is called. How can I ensure that getData() is executed before this error is triggered?

javascriptvue.js

Answer №1

In the case that Grid depends on a specific value, it should not be displayed until that value has been set.

You can approach this in one of two ways:

<Grid v-if="items" :items="items" />

Alternatively:

const items = ref()
items.value = await fetchData()

The second option will make the component asynchronous and will require the use of <Suspense> in parent components.

Answer №2

Prior to loading the data, the value of items.value is set to undefined, resulting in an error. To avoid this issue, initialize it as follows:

const items = ref(<object>)

Replace <object> with the appropriate format (such as an object with specific structure or empty) or an array to populate the grid initially.

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