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More information in error message about select of field from unbound table
author Adam Chlipala <adam@chlipala.net>
date Thu, 17 Feb 2011 14:18:18 -0500
parents d4a81273d4b1
children
rev   line source
adamc@455 1 fun pageA () = return <xml>
adamc@455 2 <head>
adamc@455 3 <title>A</title>
adamc@455 4 </head>
adamc@455 5 <body>
adamc@455 6 <form>
adamc@455 7 <table>
adamc@455 8 <tr>
adamc@455 9 <td>Forename:</td>
adamc@455 10 <td><textbox{#Forename}/></td>
adamc@455 11 </tr>
adamc@455 12 <tr>
adamc@455 13 <td>Enter a Surname?</td>
adamc@455 14 <td><checkbox{#EnterSurname}/></td>
adamc@455 15 </tr>
adamc@455 16 </table>
adamc@455 17 <submit action={fromA} />
adamc@455 18 </form>
adamc@455 19 </body>
adamc@455 20 </xml>
adamc@455 21
adamc@455 22 and fromA r =
adamc@455 23 let
adamc@455 24 val forename = r.Forename
adamc@455 25
adamc@455 26 fun pageB () = return <xml>
adamc@455 27 <head>
adamc@455 28 <title>B</title>
adamc@455 29 </head>
adamc@455 30 <body>
adamc@455 31 <form>
adamc@455 32 Surname:
adamc@455 33 <textbox{#Surname}/>
adamc@455 34 <submit action={pageC'} />
adamc@455 35 </form>
adamc@455 36 <a link={pageA ()}>Previous</a>
adamc@455 37 </body>
adamc@455 38 </xml>
adamc@455 39
adamc@455 40 and pageC' r = pageC (Some r.Surname)
adamc@455 41
adamc@455 42 and pageC surname = return <xml>
adamc@455 43 <head>
adamc@455 44 <title>C</title>
adamc@455 45 </head>
adamc@455 46 <body>
adamc@455 47 <p>Hello {[forename]}{case surname of
adamc@455 48 None => <xml/>
adamc@455 49 | Some s => <xml> {[s]}</xml>}</p>
adamc@455 50 {case surname of
adamc@455 51 None => <xml><a link={pageA ()}>Previous</a></xml>
adamc@455 52 | Some _ => <xml><a link={pageB ()}>Previous</a></xml>}
adamc@455 53 </body>
adamc@455 54 </xml>
adamc@455 55 in
adamc@455 56 if r.EnterSurname then
adamc@455 57 pageB ()
adamc@455 58 else
adamc@455 59 pageC None
adamc@455 60 end
adamc@455 61
adamc@455 62 val main = pageA