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fun pageA () = return <xml>
<head>
<title>A</title>
</head>
<body>
<form>
<table>
<tr>
<td>Forename:</td>
<td><textbox{#Forename}/></td>
</tr>
<tr>
<td>Enter a Surname?</td>
<td><checkbox{#EnterSurname}/></td>
</tr>
</table>
<submit action={fromA} />
</form>
</body>
</xml>
and fromA r =
let
val forename = r.Forename
fun pageB () = return <xml>
<head>
<title>B</title>
</head>
<body>
<form>
Surname:
<textbox{#Surname}/>
<submit action={pageC'} />
</form>
<a link={pageA ()}>Previous</a>
</body>
</xml>
and pageC' r = pageC (Some r.Surname)
and pageC surname = return <xml>
<head>
<title>C</title>
</head>
<body>
<p>Hello {[forename]}{case surname of
None => <xml/>
| Some s => <xml> {[s]}</xml>}</p>
{case surname of
None => <xml><a link={pageA ()}>Previous</a></xml>
| Some _ => <xml><a link={pageB ()}>Previous</a></xml>}
</body>
</xml>
in
if r.EnterSurname then
pageB ()
else
pageC None
end
fun main () = pageA ()
|
