AJAX validation with redux-form example

validationFunctions.js

/* EXPLANATIONS/EXAMPLES THAT MAY PROVIDE HELPFUL REFERENCE
http://erikras.github.io/redux-form/#/examples/asynchronous-blur-validation
https://github.com/erikras/react-redux-universal-hot-example/blob/b46921a990991e85522dbfc3195a46490a8f4e90/src/components/SurveyForm/SurveyForm.js
https://github.com/erikras/redux-form/issues/119
*/

// Working function with real request
export function asyncValidate (data) {
  if (!data.email) {
    return Promise.resolve({})
  }

  return new Promise((resolve, reject) => {
    $.get(
      window.location.origin +
      '/email_is_unique',
      {email: data.email}
    ).done(
      function (response) {
        if (response === false) {
          reject({email: 'This email has already been taken'})
        } else {
          resolve()
        }
      }
    )
  })
}