How do I resolve validation function error messages in Vuetify?

When utilizing validation methods in Vuetify, I encountered the following error message↓ I simply want to create a form validation check and implement a function that triggers the validation when the 'submit' button is clicked.

I believe my issue lies within the submit's validation() method in the code below. I followed the method provided on the Vuetify website, but an error message was shown

Could someone please assist me?

[error message]

Property 'validate' does not exist on type 'Vue | Element | Vue[] | Element[]'. Property 'validate' does not exist on type 'Vue'
.

    <template>
  <v-form ref="validation_check">
    <v-container>
      <v-row>
        <v-col cols="12" sm="6" md="3">
          <v-text-field
            label="name"
            v-model="text"
            :rules="[textValidation.required,textValidation.limit_lemgth]"
            counter="10"
          ></v-text-field>
        </v-col>
      </v-row>
      <v-row>
        <v-col cols="12" sm="6" md="3">
          <v-text-field
            label="phone"
            v-model="phone"
            :rules="[textValidation.required,textValidation.text_length2]"
            counter="7"
          ></v-text-field>
        </v-col>
      </v-row>
      <v-divider></v-divider>
      <v-row>
        <v-col cols="6">
          <v-btn @click="submit">submit</v-btn>
          <span v-if="success">Congurats★Validation is no prob!!</span>
        </v-col>
      </v-row>
    </v-container>
  </v-form>
</template>

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

@Component({})
export default class form extends Vue {
  text: string = "";
  phone?: number;
  success:boolean=false;

  textValidation={
     required:(v:string)=>!!v||'this is required',
     limit_lemgth:(v:string)=>v.length<=10||'Name must be less than 10 characters',    
     text_length2:(v:string)=>v.length<=10||'Phone number must be less than 7 characters',
  };

  submit(){
    if(this.$refs.validation_check.validate()){
        this.success=true
    }else{
        this.success=false;
    }
    
}


}
</script>

Please excuse my limited English proficiency.

Answer №1

When using Typescript, it's important to specify the type of this.$refs.validation_check. If not specified, the default types will be used, leading to errors like '

'Vue | Element | Vue[] | Element[]'
' and indicating that validate() does not exist on any of them.

Currently, Vuetify does not offer built-in support for Typescript with their elements. To resolve this, you'll need to create your own custom type instead of resorting to any, which goes against the purpose of TypeScript.

To create a custom type, you can define it as follows:

export type VuetifyForm = Vue & { validate: () => void }; 

If you want to include additional functions, you can chain them together using &, such as:

export type VuetifyForm = Vue & { validate: () => void } & { reset: () => void }

You can add as many functions as needed from the available options.

To eliminate the error, import the type in your component and assign this.$refs.validation_check to that type:

import { VuetifyForm } from 'your/path';

// ....  

submit() {
  if ((this.$refs.validation_check as VuetifyForm).validate()) {
    this.success = true;
  }
  // ...
}

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