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view demo/url.ur @ 1690:a7b70c7b3f1a
Avoid 'not fully determined' errors for fancy tasks
author | Adam Chlipala <adam@chlipala.net> |
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date | Sat, 03 Mar 2012 16:20:54 -0500 |
parents | 412ccd97ab71 |
children |
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fun yourChoice r = return <xml><body> {case checkUrl r.Url of None => <xml>You aren't allowed to link to there.</xml> | Some url => <xml><a href={url}>Enjoy!</a></xml>} </body></xml> fun main () = return <xml><body> <a href="http://en.wikipedia.org/wiki/Type_inference">Learn something</a><br/> <br/> <form> URL of your choice: <textbox{#Url}/> <submit action={yourChoice}/> </form> </body></xml>