Скачать или смотреть How to validate a form with Yup and Formik in JavaScript

Learn how to effectively use Yup and Formik to `validate forms` in JavaScript, ensuring smooth date and time management for user inputs.
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How to Validate a Form with Yup and Formik in JavaScript

Creating a form that captures user input while ensuring that the input data is valid is an essential task in web development. If you're working with forms in JavaScript, two popular libraries can simplify the validation process: Yup and Formik. This guide will guide you through the steps to validate a form using these libraries, particularly around validating date and time inputs.

Problem Statement

You have a form that contains fields for a date and time. Your requirements are specific: if the form is used to update an existing date, you need to ensure the user cannot change the time to within 30 minutes before or after the existing time. For example, if the preset time is 8 AM, the user should not be able to change the time to 7:30 AM or 8:30 AM. Let’s dive into how we can achieve this using Yup and Formik.

Solution Overview

To set up validation for your form effectively, you'll follow these steps:

Create a validation schema using Yup.

Map form values to props inside Formik.

Implement conditional logic to handle updates based on the form ID.

Step 1: Create a Validation Schema

First, you need to define a validation schema that includes the fields for date and time. Here’s how you can set it up with Yup:

[[See Video to Reveal this Text or Code Snippet]]

This schema ensures that both the date and time fields are required. Now, let's extend this to check for the update scenario.

Step 2: Map Form Values

You'll need to use the withFormik higher-order component to map the properties of your form to values. This helps maintain the form state based on user actions:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Implement Conditional Logic for Time Validation

Next, you’ll enhance your validation logic, particularly for the time field. You need to identify whether the form is being used to set a new date or update an existing date by checking the id. Update your schema like this:

[[See Video to Reveal this Text or Code Snippet]]

In this code segment, we use the .when method to conditionally execute additional validation when the id is present. You will need to add the specific logic to check if the time entered is within the 30-minute window surrounding the preset time.

Conclusion

Validating a form with Yup and Formik can greatly enhance user experience by preventing invalid submissions. By outlining a clear validation schema and leveraging the power of conditional logic, we can ensure users only enter valid information. The example provided illustrates how to set up the essentials for time and date validations, catering to both create and update form scenarios. Happy coding!