To demonstrate simple form-building in react native, I will create a simple form with name, phone number, email, password, and confirm password input fields. A state is a window or screen in a database that contains various fields or spaces to insert data. Every area has a field label, so any user who visits the form can get an idea of what it contains.
A form is used in software development to obtain values from a user and store the information entered by the user in the database via API calls. However, working with the form’s input controls and react native form validation is a little tricky. This is where Formik and Yup come in; Formik allows you to build forms more quickly, while Yup handles validation.
Formik is a small but powerful library that helps you with the three most difficult aspects of form building in react-native. It also aids in an organization by building, testing, and refactoring your forms.
👉Handling form submission
👉Validation and error messages
👉Managing form values of form state
Yup is a value parsing and validation JavaScript schema builder. Assign a schema, convert a value to match, validate an existing value’s shape, or both. Schema is extremely powerful, allowing you to model complex, interdependent validations or value transformations.
Install Formik Package & Yup Packages
In this step, we will install Formik and Yup packages to create and validate forms in React Native.
# for npm npm install formik yup --save # for yarn yarn add formik yup
Importing necessary core component from react native with yup and formik.
When we add TextInputs for things like email addresses, we need to create a state to store the email value and a handle change function to handle text changes and update the email state.
This can become overwhelming, especially when dealing with many inputs.
This is where Formik comes in to assist with all of the repetitive work. So, let’s see how we can do it with Formik by adding an input form.
This is where input validation comes in; we want to create a validation schema that checks to see if the input format is correct. We will, as previously stated, use Yup to generate the validation schema and provide custom error messages for each check.
We will use the validation schema to
We use regex to ensure that users enter at least two names for the full name above. We also use regex to check the phone number format; we can give our validation in any form. Finally, we use regex to ensure that the user creates a password that contains at least one small letter, one capital letter, one number, one unique character, and at least ten characters.
We also use Yup to ensure that the confirmed password matches the password.
Here is the full Example:
| SI No. | By using Formik & Yup | By using Custom Validation |
| 01 | Write less in code per form | Write More in code per form |
| 02 | useState hook is not required to validate | useState hook is required to validate |
| 03 | Enforces a clear, opinionated, proven, and well-documented approach to form management. | Worth the cost? Depends on how many forms you have. |
| 04 | Handling form submission is easy | Handling form submission is hard due to more code lines |
Screen Record : Link 2
Related Read : How To Implement React Native Multi Language Support
In this blog, we saw and implement the Form validations by using Formik and Yup and how faster we can validate with less code and less logic inside our Project.Â
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