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One way would be to match the email string against a RegEx pattern to check that it is formatted properly.

There are many ways to write a custom email validation function. The TouchableHighlight component can serve as a button that runs a validation function against the email address before submitting it to the server. The TextInput accepts user input, which can be stored in the component state as an email address. You can do email validation in React Native using the Native Components TextInput component. React Native then transfers the React JS component hierarchy to the mobile device view. React Native spins up threads that interpret the JavaScript code, then creates a native bridge between the React JS code and the target platform. React Native is a JavaScript mobile framework that enables developers to write native mobile applications using React. We also need to display a loading indicator or spinner to the user while the request is sent.įor now, however, we have a solid start on a robust, well-validated user input form for our mobile app. For example, we aren’t handling network errors that may arise while sending the validation request to the endpoint.

There is a lot more we could do with these simple inputs. From here, adding a password field and first and last name fields would be very simple. We also explored using the AbstractAPI Email Validation and Verification API to validate the format of email addresses. In this article, we explored three different methods of doing validation for a form with React Native. Let’s make our email required, and also use our AbstractAPI validation function in the validate field. Pass Validation Parameters to the Controller

It also allows you to pass a RegEx pattern for validation, or pass a custom validate function. The rules prop accepts several parameters like minLength, maxLength, required. The Controller component has a useful rules prop that allows you to provide some validation parameters for the input. Remove the old component from App.js and render this one instead. You’ll probably notice we copied over the same StyleSheet from the last two components.