The error message "Undefined value received instead of a string or boolean in Vuetify and nuxt.js rules" indicates that the expected data type was not provided

I recently created an app at my workplace and encountered an error in the text area similar to what I have described in my title. After researching the issue online, I found some information but still struggle to fully grasp the concept.

My objective is to utilize literals as objects, although it seems that rules cannot be applied to literal objects. As a total beginner, I am not very proficient in English language. If you understand this, please feel free to reach out!

<template>
    <v-card width="600" persistent>
        <v-card-tex>
            <v-row>
            <v-col cols="8">
                <v-textarea 
                    filed 
                    dense
                    v-model="testtext"
                    :rules="v=>!!v||'this is required!'"></v-textarea>
            </v-col>
        </v-row>
        </v-card-tex>
    </v-card>
</template>

<script lang="ts">
import {Vue} from 'nuxt-property-decorator'

export default class extends Vue{
   testtext:string= `test`
}
</script>

Answer №1

My suggestion is to apply the rules in the following manner when using v-textarea :

:rules="[v => !!v||'this is required!']"

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