Validations

In order to validate fields, we used one of the most popular validations libraries for vue - Vee-Validate It has good documentation and it's pretty easy to use.

import Vue from 'vue'
import VeeValidate from 'vee-validate'
Vue.use(VeeValidate)

For detailed usage please see Vee Validate documentation We will go through the code from the LoginForm.vue from Validation Forms to understand how validations work.

Here is the full template for that specific component.

Login Form

Email address *

Password *

  <ValidationObserver v-slot="{ handleSubmit }">
    <form @submit.prevent="handleSubmit(submit)">
    <card title="Login Form">
      <div>
        <ValidationProvider
          name="email"
          rules="required|email"
          v-slot="{ passed, failed, errors }"
        >
        <base-input
          required
          v-model="email"
          type="email"
          label="Email address"
          :error="errors[0]"
          :class="[{ 'has-success': passed }, { 'has-danger': failed }]">
        </base-input>
       </ValidationProvider>

       <ValidationProvider
         name="password"
         rules="required|min:5"
         v-slot="{ passed, failed, errors }"
       >
       <base-input
         required
         v-model="password"
         type="password"
         label="Password"
          :error="errors[0]"
         :class="[{ 'has-success': passed }, { 'has-danger': failed }]">
       </base-input>
      </ValidationProvider>
      </div>
      <div class="d-flex justify-content-center">
        <button type="submit" native-type="submit" class="btn btn-fill btn-info btn-wd">Login</button>
      </div>
    </card>
  </form>
  </ValidationObserver>

Show Code

The main things you need to notice are

1. Each field has a name attribute which will be the name of the validation property.
2. Each field has a v-validate attribute which will contain validation rules for that specific field.
3. Each field has a text block below the input displaying errors. (In case of base-input component the text block is displayed with the help of error prop)

The javascript for this template is the following

import { extend } from "vee-validate";
import { required, email, min } from "vee-validate/dist/rules";
import { configure } from 'vee-validate';

extend("email", email);
extend("required", required);
extend("min", min);

    export default {
    props: ['slot-key'],
      data () {
        return {
          email: '',
          password: '',
          modelValidations: {
            email: {
              required: true,
              email: true
            },
            password: {
              required: true,
              min: 5
            }
          }
        }
      },
      methods: {
        submit() {
          alert("Form has been submitted!");
        }
      }
    }

Vee-validate basically works by linking name attributes and v-validate directives to an errors object which is injected and available in each component. You can check out available validations from vee-validate.

Working example

Login Form

Email address *

Password *

<template>
  <ValidationObserver v-slot="{ handleSubmit }">
    <form @submit.prevent="handleSubmit(submit)">
    <card title="Login Form">
      <div>
        <ValidationProvider
          name="email"
          rules="required|email"
          v-slot="{ passed, failed, errors }"
        >
        <base-input
          required
          v-model="email"
          type="email"
          label="Email address"
          :error="errors[0]"
          :class="[{ 'has-success': passed }, { 'has-danger': failed }]">
        </base-input>
       </ValidationProvider>

       <ValidationProvider
         name="password"
         rules="required|min:5"
         v-slot="{ passed, failed, errors }"
       >
       <base-input
         required
         v-model="password"
         type="password"
         label="Password"
          :error="errors[0]"
         :class="[{ 'has-success': passed }, { 'has-danger': failed }]">
       </base-input>
      </ValidationProvider>
      </div>
      <div class="d-flex justify-content-center">
        <button type="submit" native-type="submit" class="btn btn-fill btn-info btn-wd">Login</button>
      </div>
    </card>
  </form>
  </ValidationObserver>
</template>
<script>

import { extend } from "vee-validate";
import { required, email, min } from "vee-validate/dist/rules";
import { configure } from 'vee-validate';

extend("email", email);
extend("required", required);
extend("min", min);

    export default {
    props: ['slot-key'],
      data () {
        return {
          email: '',
          password: '',
          modelValidations: {
            email: {
              required: true,
              email: true
            },
            password: {
              required: true,
              min: 5
            }
          }
        }
      },
      methods: {
        submit() {
          alert("Form has been submitted!");
        }
      }
    }
</script>
<style>
</style>

Show Code

You can check more examples inside src/components/Dashboard/Forms/ValidationForms/ There are some forms which have validations declared in a similar way