Mastering Form Validation in Vue 3 with Vee-Validate 4
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Chapter 1: Introduction to Form Validation
In any application, form validation plays a crucial role. This article will guide you through the process of utilizing Vee-Validate 4 within a Vue 3 application to manage form validation efficiently.
Section 1.1: Getting Started with Script Tag
To kick things off, we can use the script tag to set up our environment. The v-form component serves as the container for our forms, while the v-field component functions as our input field. Additionally, the error-message component is employed to display any validation errors. Below is an example setup:
<!DOCTYPE html>
<html lang="en">
<head>
<title>App</title></head>
<body>
<div id="app">
<v-form @submit="onSubmit">
<v-field
name="name"
as="input"
type="text"
placeholder="What's your name?" :rules="isRequired"
></v-field>
<br />
<error-message name="name"></error-message>
<br />
<button>Submit</button>
</v-form>
</div>
<script>
const app = Vue.createApp({
components: {
VForm: VeeValidate.Form,
VField: VeeValidate.Field,
ErrorMessage: VeeValidate.ErrorMessage
},
methods: {
isRequired(value) {
return value ? true : "This field is required.";},
onSubmit(values) {
alert(JSON.stringify(values, null, 2));}
}
});
app.mount("#app");
</script>
</body>
</html>
In this example, we begin by including the script tag for Vee-Validate. We then register the VForm, VField, and ErrorMessage components to utilize them within our template. The isRequired method serves as our validation rule, returning true for valid input and an error message otherwise. The v-field component is set to render as an input box using the as prop, while the error-message component corresponds to the field being validated.
Section 1.2: Using the NPM Package
Alternatively, we can install the Vee-Validate package through NPM. Run the following command:
yarn add vee-validate@next
or
npm i vee-validate@next --save
Once installed, we can implement it as follows:
<template>
<Form v-slot="{ errors }">
<Field name="field" as="input" :rules="isRequired" />
<br />
<span>{{ errors.field }}</span>
</Form>
</template>
<script>
import { Field, Form } from "vee-validate";
export default {
components: {
Field,
Form,
},
methods: {
isRequired(value) {
return value ? true : "This field is required.";},
},
};
</script>
In this approach, the Field and Form components are imported and registered for use within our template. The Form component acts as a wrapper for the form, providing access to any validation error messages through the slot's errors prop. The Field component operates similarly to the v-field component, displaying validation messages as needed.
Chapter 2: Conclusion
In conclusion, implementing straightforward form validation in your Vue 3 applications with Vee-Validate 4 is both efficient and user-friendly.
This first video demonstrates how to create a login form in Vue 3 using Vee-Validate 4, providing a practical example of form validation.
In this second video, learn how Vee-Validate simplifies form validation in Vue applications, making it easier to manage user input.