Hi all,

I have tested Websharper.Forms a bit and really like it. I was going through the "Piglets to the rescue" PDF from http://www.cs.ru.nl/P.Achten/IFL2013/symposium_proceedings_IFL2013/ifl2013_submission_29.pdf and thought I'd try some things out with a very simple user list. Now, there is one thing I came across and that I don't understand.

I have created a simple record type TUser for user management (login/first name/last name). I created a form UserForm and an according render method, which displays text boxes (Doc.Input). Then, I added a function AddUserForm() that returns another form, which is essentially the same as UserForm but is initialized with an "empty" user and has a submitter:

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let AddUserForm () = 
  let init = {Login=""; FirstName=""; LastName=""}
  Form.Return(fun lo f l -> {Login=lo; FirstName=f; LastName=l})
  <*> (Form.Yield init.Login |> Validation.IsNotEmpty "Enter login.")
  <*> (Form.Yield init.FirstName |> Validation.IsNotEmpty "Enter first name.")
  <*> (Form.Yield init.LastName |> Validation.IsNotEmpty "Enter last name.")
  |> Form.WithSubmit

Next, I combined these two into another Form "UsersForm" via Form.ManyForm:

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let UsersForm (lst:TUser list) =
  Form.Return(fun lst -> lst)
  <*> Form.ManyForm lst (AddUserForm()) UserForm

Finally, I added render functions for the adder and the combined Form. The render function for the combined Form takes a parameter users:Form.Many.Collection<...> and calls users.Render and users.RenderAdder, respectively.

This works almost fine, I can add users; however, after doing so, the form for the new user (i.e., the text boxes in the browser) still have the old values -- if I enter e.g. JDOE/John/Doe and click "submit", John Doe appears in the list, and the form for adding the next user still says JDOE/John/Doe, I have to manually clear the input fields. Is this the desired behaviour? If I want the text boxes to be emptied after adding a user, how can I achieve this? Or am I doing something wrong here? I haven't found much information about Form.ManyForm, only one sample (https://github.com/intellifactory/websharper.forms/blob/master/WebSharper.Forms.Tests/Forms.fs), where it is used like this:

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Form.ManyForm Seq.empty (AddItemForm()) Form.Yield

However, I don't quite understand the last "Form.Yield", according to the PDF, that argument is supposed to be the Form for displaying each single list item.

Thank you in advance!

Derek