Created
August 20, 2015 02:14
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Simple calculator using imperative update
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| <html> | |
| <head> | |
| <title></title> | |
| <style> | |
| button { | |
| width: 48px; | |
| height: 36px; | |
| margin: 5px; | |
| } | |
| input[type="text"] { | |
| margin: 5px; | |
| width: 222px; | |
| padding: 5px; | |
| font-size: 18px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="main"></div> | |
| <!--[BODY]--> | |
| </body> | |
| </html> |
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| namespace Samples | |
| open WebSharper | |
| open WebSharper.JavaScript | |
| open WebSharper.Html.Client | |
| [<JavaScript>] | |
| module Calculator = | |
| let Main = | |
| let onum, num, op = ref 0., ref 0., ref None | |
| let display = Input [Attr.Type "Text"; Attr.Value "0"] | |
| let updateDisplay () = display.Value <- string !num | |
| let D n = | |
| num := 10. * !num + n | |
| updateDisplay () | |
| let C () = | |
| num := 0. | |
| updateDisplay() | |
| let AC () = | |
| num := 0. | |
| onum := 0. | |
| op := None | |
| updateDisplay () | |
| let N () = | |
| num := - !num | |
| updateDisplay () | |
| let E () = | |
| match !op with | |
| | None -> | |
| () | |
| | Some f -> | |
| num := f !onum !num | |
| op := None | |
| updateDisplay () | |
| let O o () = | |
| match !op with | |
| | None -> | |
| () | |
| | Some f -> | |
| num := f !onum !num | |
| updateDisplay () | |
| onum := !num | |
| num := 0. | |
| op := Some o | |
| let btn caption action = | |
| Button [Text caption] | |
| |>! OnClick (fun _ _ -> action ()) | |
| let digit n = | |
| btn (string n) (fun () -> D n) | |
| let calculator = | |
| Div [ | |
| display | |
| Br [] | |
| Div [ | |
| digit 7.; digit 8.; digit 9.; btn "/" (O ( / )) | |
| Br [] | |
| digit 4.; digit 5.; digit 6.; btn "*" (O ( * )) | |
| Br [] | |
| digit 1.; digit 2.; digit 3.; btn "-" (O ( - )) | |
| Br [] | |
| digit 0.; btn "C" C; btn "AC" AC; btn "+" (O ( + )); | |
| Br [] | |
| btn "+/-" N; btn "=" E | |
| ] | |
| ] | |
| calculator.AppendTo "main" | |
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