Vue 3 Composition API is a new approach to organizing and reusing logic in Vue components. It provides a set of functions and utilities that allow you to define component behavior in a more modular and flexible way. With the Composition API, you can encapsulate form validation logic and keep it separate from the component's template, resulting in cleaner and more maintainable code.

In the example provided, we use the Composition API to define a reactive formData object that holds the input values entered by the user and a formErrors object to store the validation error messages for each field. The validateForm function is responsible for performing the actual validation checks on the form fields. It clears any previous errors, validates each field according to the specified criteria, and sets the corresponding error messages in the formErrors object.

The example demonstrates how to validate three input fields: name, email, and password. For each field, it checks for specific validation rules. If a field is empty or doesn't meet the required criteria, an appropriate error message is set in the formErrors object.

In the template section, the input fields are bound to the corresponding properties in the formData object using the v-model directive, which establishes two-way data binding. The validation error messages are displayed using {{ formErrors.fieldName }} syntax, where fieldName is the name of the field (e.g., name, email, password).

The form's submit event is bound to the validateForm function using @submit.prevent to prevent the default form submission behavior. When the form is submitted, the validateForm function is called, which performs the validation checks on all fields. If the form is valid, the function returns true, indicating that the form can be submitted. Otherwise, the error messages are displayed, indicating the fields that require correction.

Validate Multiple Fields in same form using Vue3 in code snippet:

To validate multiple input fields in the same form using Vue 3 Composition API, you can follow these steps:

1. First, make sure you have the necessary dependencies installed. You'll need Vue 3 and the Composition API:

2. Import the required functions from Vue and define a reactive object to hold the form data and validation status:

        formErrors.name = 'Name is required.';

        formErrors.email = 'Email is required.';

      } else if (!isValidEmail(formData.email)) {

        formErrors.email = 'Invalid email format.';

        formErrors.password = 'Password is required.';

      } else if (formData.password.length < 6) {

        formErrors.password = 'Password should be at least 6 characters long.';

      // Return true if the form is valid

      return Object.values(formErrors).every(error => error === '');

      // Use a regular expression to validate the email format

      const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

3. In your template, bind the input fields to the corresponding form data properties and display the validation errors:

      <span>{{ formErrors.email }}</span>

      <label for="password">Password:</label>

      <span>{{ formErrors.password }}</span>

Validating multiple input fields in a Vue 3 form using Composition API for organized and modular form validation.

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