Custom form validation

Custom form validation

Vuetify provides built-in validation of form inputs.

To use built-in validation, pass in an array of Javascript expressions to the rules prop of the form input.

For example: an array of rules in the wrapping component’s data object:

  data () {
    return {
      rules: {
        required: value => !!value || 'Required.',
        minLength: value => (value && value.length >= 3) || 'Username must be 3 or more characters',
        email: value => {
          const pattern = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
          return pattern.test(value) || 'Invalid email.'

Some of which are passed in as an array to the rules prop of the <v-text-field> component

    :rules="[rules.required, rules.minLength]"

Rules are validated sequentially, and will display a maximum of one error at a time, so order matters.

If more complex validation is required, Vuetify can integrate Vee-validate or Vuelidate.