How to bind only once.

ReactBindingFunctions.js

class SomeForm extends React.Component {
  constructor(props) {
    super(props);
    this.onSubmit = this.onSubmit.bind(this);
  }

  onSubmit() {
    // ...
  }
  
  render() {
    return(
      <form onSubmit={this.onSubmit}>
        Form Fields Here
      </form>
    );
  }
}

// Or, if you don't want to .bind
class SomeForm extends React.Component {
  onSubmit = () => {
    // eyyy
  }

  render() {
    return(
      <form onSubmit={this.onSubmit}>
        Form Fields Here
      </form>
    );
  }
}