BootstrapVue Form Array to Textarea With vuelidate

April 9, 2020

The basic setup is as per BootstrapVue Form With Validation (vuelidate).

We shall have a field friends which is an array of friend names, which shall be displayed in a textarea separated by lines, and save back to friends as array.

  • v-model using itemFriends to handle transformation between lines of string and array
  • validation using friends, so you can do more advance things like count number of friends
<template>
  <div>
    <b-form ref="form" @submit.prevent="submit">
      <b-form-group
        label="Name"
        label-for="input-name"
        invalid-feedback="Name is required"
      >
        <b-form-input
          :state="validateState($v.item.name)"
          id="input-name"
          v-model="$v.item.name.$model"
        ></b-form-input>
      </b-form-group>

      <b-form-group
        label="Friends"
        label-for="input-friends"
        invalid-feedback="Friends are required"
      >
        <b-form-textarea
          :state="validateState($v.item.friends)"
          id="input-friends"
          v-model="$v.itemFriends.$model"
        ></b-form-textarea>
      </b-form-group>

      <b-button type="submit" variant="primary">Submit</b-button>
    </b-form>
  </div>
</template>

<script>
import { validationMixin } from "vuelidate"
import { required, minLength } from "vuelidate/lib/validators"

export default {
  mixins: [validationMixin],
  // props: ['item'],
  data() {
    item: {
      name: 'Desmond',
      friends: ['Elon', 'Jack', 'Mei Ru']
    },
  },
  validations: {
    item: {
      name: {
        required
      },
      friends: {
        required
      },
    },
    itemFriends: {
      // required
    }
  },
  methods: {
    friends: {
      get() {
        return this.item.friends.join('\n')
      },
      set(value) {
        if (value)
          this.item.friends = value.split('\n')
        else
          this.item.friends = []
      }
    },
    validateState(item) {
      const { $dirty, $error } = item
      return $dirty ? !$error : null
    },
    submit() {
      this.$v.item.$touch()
      if (this.$v.item.$anyError)
        return false

      console.log(this.item)
      alert("Form submitted!")
    }
  }
}
</script>
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