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Vue.js form validation vee-validate library

Posted on December 3, 2021December 3, 2021 By christo No Comments on Vue.js form validation vee-validate library

vee-validate is a form validation library for Vue.js that allows you to validate inputs and build better form UIs in a familiar declarative style or using composition functions

Table of Contents

  • Features
  • Getting Started
    • Installation
  • Vue version support
  • Usage
  • Composition API

Features

  • 🍞 Easy: Declarative validation that is familiar and easy to setup
  • 🧘‍♀️ Flexible: Synchronous, Asynchronous, field-level or form-level validation
  • ⚡️ Fast: Build faster forms faster with intuitive API and small footprint
  • 🏏 Minimal: Only handles the complicated form concerns, gives you full control over everything else
  • 😎 UI Agnostic: Works with native HTML elements or your favorite UI library components
  • 🦾 Progressive: Works whether you use Vue.js as a progressive enhancement or in a complex setup
  • ✅ Built-in Rules: Companion lib with 25+ Rules that covers most needs in most web applications
  • 🌐 i18n: 45+ locales for built-in rules contributed by developers from all over the world

Getting Started

Installation

# Install with yarn
yarn add vee-validate@next

# Install with npm
npm install vee-validate@next --save

Vue version support

The main v4 version supports Vue 3.x only, for previous versions of Vue, check the following the table

vue Versionvee-validate versionDocumentation Link
2.x2.x or 3.xv2 or v3
3.x4.xv4
Vue version support

Usage

vee-validate offers two styles to integrate form validation into your Vue.js apps

Declarative Components

Higher-order components are better suited for most of your cases. Register the Field and Form components and create a simple required validator:

import { Field, Form } from 'vee-validate';

export default {
  components: {
    Field,
    Form,
  },
  methods: {
    isRequired(value) {
      return value ? true : 'This field is required';
    },
  },
};

Then use the Form and Field components to render your form:

<Form v-slot="{ errors }">
  <Field name="field" :rules="isRequired" />

  <span>{{ errors.field }}</span>
</Form>

The Field component renders an input of type text by default but you can control that

Composition API

If you want more fine grained control, you can use useField function to compose validation logic into your component:

import { useField } from 'vee-validate';

export default {
  setup() {
    // Validator function
    const isRequired = value => (value ? true : 'This field is required');
    const { value, errorMessage } = useField('field', isRequired);

    return {
      value,
      errorMessage,
    };
  },
};

Then in your template, use v-model to bind the value to your input and display the errors using errorMessage:

<input name="field" v-model="value" />
<span>{{ errorMessage }}</span>
Demo
Full Project
vue.js

Post navigation

Previous Post: vue inner image zoom
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