React-Redux Form PreventDefault

React-Redux Form is a library for managing form state in React and Redux applications. One common problem that arises when submitting forms is that the page reloads or navigates to a different URL. In order to prevent this behavior, we can use preventDefault().

What is preventDefault()?

preventDefault() is a method of the event object that can be called to prevent the default behavior of an event. For example, when a form is submitted, the default behavior is to reload the page or navigate to a new URL. By calling preventDefault() on the submit event, we can prevent this behavior.

How can we use preventDefault() with React-Redux Form?

React-Redux Form provides a handleSubmit() function that is used to handle form submissions. We can pass an event handler to handleSubmit() that calls preventDefault() and then performs the necessary form submission logic.

import { Field, reduxForm } from 'redux-form';

const MyForm = props => {
  const { handleSubmit } = props;

  const onSubmit = event => {
    event.preventDefault();
    handleSubmit();
  };

  return (
    <form onSubmit={onSubmit}>
      <div>
        <label htmlFor="firstName">First Name</label>
        <Field name="firstName" component="input" type="text" />
      </div>
      <div>
        <label htmlFor="lastName">Last Name</label>
        <Field name="lastName" component="input" type="text" />
      </div>
      <button type="submit">Submit</button>
    </form>
  );
};

export default reduxForm({
  form: 'myForm',
})(MyForm);

In the above example, we define a onSubmit() event handler that calls preventDefault() and then handleSubmit(). We pass onSubmit to the onSubmit prop of our form.

Conclusion

Preventing the default behavior of form submissions with preventDefault() is a common use case. By using handleSubmit() in combination with an event handler that calls preventDefault(), we can prevent the page from reloading or navigating to a new URL after a form submission.