How do I use validators in Vue 3?

How do I use validators in Vue 3?

In Vue 3, you can use validators to ensure that your form inputs meet certain criteria. You can create custom validators or use built-in ones. Would you like to see an example?

Yes, please show me an example of a custom validator.

Sure! You can create a custom validator by defining a method in your component. For instance, you can create a validator that checks if a value is an email address. Here's a simple example:

methods: {
  validateEmail(value) {
    const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailPattern.test(value);
  }
}

How do I apply this validator to a form input?

You can use the v-model directive to bind the input to a data property and then use the :class binding to show validation errors. Here's how:

<input v-model="email" :class="{'is-invalid': !validateEmail(email)}" />

What if I want to use multiple validators?

You can chain multiple validators by creating an array of validation functions and checking each one. You can return true only if all validators pass.