The message from Vee-validate indicates that the validator 'required_if' does not exist within the system

I'm currently implementing vee-validate version 3 with Vue 2.7 in my project. Specifically, this is the entry in my package.json file for vee-validate:

"vee-validate": "^3.4.5",

My issue lies with getting the required_if rule to function correctly. Whenever I attempt to use it, I encounter the following error:

Uncaught (in promise) Error: No such validator 'required_if' exists.

Below is a snippet of the code causing the error:

<ValidationObserver>
  <ValidationProvider rules="" vid="country" v-slot="x">
    <select v-model="country">
      <option value="US">United States</option>
      <option value="OTHER">Other country</option>
    </select>
  </ValidationProvider>

  <ValidationProvider rules="required_if:country,US" v-slot="{ errors }">
    <input type="text" placeholder="state" v-model="state" />
    <span>{{ errors[0] }}</span>
  </ValidationProvider>
</ValidationObserver>

This code closely resembles the example provided in the official documentation for the required_if rule on . I am at a loss as to why I am receiving this error despite following the given example.

javascriptvue.jsvuejs2vee-validate

Answer №1

To use these rules, you must import them as they are not included by default.

You can include the following lines in your component:

import { required_if } from "vee-validate/dist/rules";
import { extend } from "vee-validate";
extend("required_if", required_if);

Alternatively, you can create a plugin file and import all non-default rules:

import { extend } from 'vee-validate';
import * as rules from 'vee-validate/dist/rules';

Object.keys(rules).forEach(rule => {
 extend(rule, rules[rule]);
});

for (let [rule, validation] of Object.entries(rules)) {
 extend(rule, {
  ...validation
 });
}

Reference:

Note: Ensure that you have vee-validate version greater than v3.1

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