• make GET RESTful api which returns email address already exists if api returns boolean data
  • example:

<input api="/api/v1/users" query="email" ng-model="vm.form.email"/>

will call api

'/api/v1/users?email={{ vm.form.email }}'

• the api should return a boolean data

  • true: the email address already exists
  • false: the email address does not exist

• should make RESTful API yourself which returns right value.