React form submit

code.js

class SomeForm extends React.Component {

    // constructor, render() etc are form-specific
  
    async submit(e) {
        e.preventDefault();
        const errors = validate(this.state);
        if (errors.hasError()) {
            this.setState({ errors: errors.extract() });
            return;
        }
        try {
            this.setState({ loading: true });
            await (this.id ? this.update() : this.save());
            window.scheduleFlash('Order data has been saved.');
            window.location = '/orders';
        } catch (err) {
            if (err.json) {
                if (err.json.errors) {
                    this.setState({ errors: err.json.errors });
                } else if (err.json.message) {
                    this.setState({ error: err.json.message });
                }
            } else {
                window.showSaveError();
                throw err;
            }
        } finally {
            this.setState({ loading: false });
        }
    }
}