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Vuelidate validation of computed property

Asked By: Anonymous

In my Vue component I have 3 numeric fields, like this:

data() {
    return {
        numberAdults: 0,
        numberChildren: 0,
        numberInfants: 0,

and also a computed property:

computed: {
    numberPersons() {
        return this.numberAdults + this.numberChildren + this.numberInfants

I want to validate that at least one person is set (at least one adult or one child or one infant), but I cannot make this to work. This is the validation rule:

numberPersons: {
    minValue: minValue(1),

If I change the numberPersons with one of the three fields, the validation for that field works. I think that somehow Vuelidate doesn’t know what numberPersons is, but I am not sure how to change that.


Answered By: Anonymous

You can create a custom validation method, say, minNumberPersons that simply validates your computed property this.numberPersons:

const minNumberPersons = (value, vm) => {
    return vm.numberPersons >= 1;

Then, you can apply these rules to the different models:

validations: {
  numberAdults: { numberPersons },
  numberChildren: { numberPersons },
  numberInfants: { numberPersons }

UX suggestion, totally optional: On a side note, since you are going to be validating 3 fields at the same time, it makes sense to use the $v.<field>.$touch() method to ensure that the dirty state of all 3 fields are set to true when any of them are changed. You can simply do a @input="onInput" binding in your template, and add this to your methods:

onInput() {

See proof-of-concept here. I have adapted it from the demo JSFiddle used by the Vuelidate repository.



const numberPersons = (value, vm) => {_x000D_
  return vm.numberPersons >= 1;_x000D_
new Vue({_x000D_
  el: "#app",_x000D_
  data: {_x000D_
    numberAdults: 0,_x000D_
    numberChildren: 0,_x000D_
    numberInfants: 0,_x000D_
  validations: {_x000D_
    numberAdults: { numberPersons },_x000D_
    numberChildren: { numberPersons },_x000D_
    numberInfants: { numberPersons }_x000D_
  computed: {_x000D_
    numberPersons() {_x000D_
      // Converting each to a number using the unary + operator, in case user inputs empty string_x000D_
      return (+this.numberAdults) + (+this.numberChildren) + (+this.numberInfants);_x000D_
  methods: {_x000D_
    status(validation) {_x000D_
      return {_x000D_
        error: validation.$error,_x000D_
        dirty: validation.$dirty_x000D_
    // Optional: force validation of all number inputs when any one is changed_x000D_
    onInput() {_x000D_


body {_x000D_
  background: #fff;_x000D_
input {_x000D_
  border: 1px solid silver;_x000D_
  border-radius: 4px;_x000D_
  background: white;_x000D_
  padding: 5px 10px;_x000D_
.dirty {_x000D_
  border-color: #5A5;_x000D_
  background: #EFE;_x000D_
.dirty:focus {_x000D_
  outline-color: #8E8;_x000D_
.error {_x000D_
  border-color: red;_x000D_
  background: #FDD;_x000D_
.error:focus {_x000D_
  outline-color: #F99;_x000D_


<!-- Boilerplate adapted from Vuelidate's default demo: -->_x000D_
<a href=""></a>_x000D_
<a href=""></a>_x000D_
<div id="app">_x000D_
  <input v-model.number="$v.numberAdults.$model" :class="status($v.numberAdults)" @input="onInput" type="number">_x000D_
  <input v-model.number="$v.numberChildren.$model" :class="status($v.numberChildren)" @input="onInput" type="number">_x000D_
  <input v-model.number="$v.numberInfants.$model" :class="status($v.numberInfants)" @input="onInput" type="number">_x000D_
  <br />_x000D_
  <br />_x000D_
  Total number of people: <strong>{{ numberPersons }}</strong>_x000D_




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