如何将常用输入用于两种形式？

Question

i want to create landing page which has two form one for login and another foe register. but my design is like as following fig.(i try to explain in this fig.) and i want use nested form. login form is inside registration form.

when user click on login submit data to login.jsp and for register button submit to register.jsp

i know nested form is not possible in html but any other method available in JavaScript or jsp so i can implement this functionality.

so i want to use these email and password inputs for login form and also for registration form also.

 __________________________________________
|                                          |
|  ___________________________             |
| |                           |            |
| |                           |            |
| |  email                    |            |
| |                           |            |
| |                           |            |
| |                           |  Login     |
| |                           |            |
| |  password                 |            |
| |                           |            |
| |                           |            |
| |___________________________|            |
|                                          |
|                                          |
|  First Name                              |
|                                          |
|                                          |
|  Last Name                               |
|                                          |
|                                          |
|  Birth Day                               |
|                                          |
|                 Register                 |
|__________________________________________|

Thank You.

Answer 1

Use a single form which submits to user.jsp and branch based on which submit button ( <input type="submit" name="login" value="Login"> or <input type="submit" name="register" value="Register"> ) appears in the submitted data.

Ignore all the fields you don't care about if the Login branch is followed.

Answer 2

Forms should not be nested. It goes against the html5 working draft .

4.10.3 The form element

Content model:

Flow content, but with no form element descendants.

You could create two separate forms, with hidden email & password fields in the latter one. Then attach a function that copies those fields from one form to the other when user clicks register -button.