How can I implement custom validation in Vue 3 using Vuelidate?

How can I implement custom validation in Vue 3 using Vuelidate?

To implement custom validation in Vue 3 with Vuelidate, you can create a custom validator function and use it in your validation rules.

Can you show me an example of a custom validator?

Sure! Here's a simple example:

import { required, minLength } from '@vuelidate/validators';

const customValidator = (value) => {
  return value && value.length >= 5;
};

const validations = {
  myField: {
    required,
    minLength: minLength(5),
    customValidator
  }
};

What if I want to combine multiple validators?

You can combine multiple validators by including them in the same object. For example:

const validations = {
  myField: {
    required,
    minLength: minLength(5),
    customValidator
  }
};

How do I display validation errors in my template?

You can use computed properties to check for validation errors and display them in your template. For example:

<span v-if="!$v.myField.$pending && !$v.myField.required">Field is required</span>
<span v-if="!$v.myField.$pending && !$v.myField.customValidator">Field must be at least 5 characters</span>