diff options
| author |  Adam Chlipala <adamc@hcoop.net> | 2008-10-21 17:30:06 -0400 |
|---|---|---|
| committer | Adam Chlipala <adamc@hcoop.net> | 2008-10-21 17:30:06 -0400 |
| commit | d4e5d7bbce0aac719ac2c6451e0a6bfb675ab641 (patch) | |
| tree | 5f06bbcd006f618093f9483a42e3e642ee9ea91c | |
| parent | 5411e88620c19474569ce7c2280235beaa6cd1f5 (diff) | |
Form example
| -rw-r--r-- | demo/form.ur | 18 | ||||
| -rw-r--r-- | demo/form.urp | 2 | ||||
| -rw-r--r-- | demo/form.urs | 1 | ||||
| -rw-r--r-- | demo/listShop.urp | 1 | ||||
| -rw-r--r-- | demo/prose | 8 | ||||
| -rw-r--r-- | lib/basis.urs | 14 |
6 files changed, 37 insertions, 7 deletions
diff --git a/demo/form.ur b/demo/form.ur new file mode 100644 index 00000000..ec466db3 --- /dev/null +++ b/demo/form.ur @@ -0,0 +1,18 @@ +fun handler r = return <xml><body> + <table> + <tr> <th>A:</th> <td>{[r.A]}</td> </tr> + <tr> <th>B:</th> <td>{[r.B]}</td> </tr> + <tr> <th>C:</th> <td>{[r.C]}</td> </tr> + </table> +</body></xml> + +fun main () = return <xml><body> + <form> + <table> + <tr> <th>A:</th> <td><textbox{#A}/></td> </tr> + <tr> <th>B:</th> <td><textbox{#B}/></td> </tr> + <tr> <th>C:</th> <td><checkbox{#C}/></td> </tr> + <tr> <th/> <td><submit action={handler}/></td> </tr> + </table> + </form> +</body></xml> diff --git a/demo/form.urp b/demo/form.urp new file mode 100644 index 00000000..73356d49 --- /dev/null +++ b/demo/form.urp @@ -0,0 +1,2 @@ + +form diff --git a/demo/form.urs b/demo/form.urs new file mode 100644 index 00000000..6ac44e0b --- /dev/null +++ b/demo/form.urs @@ -0,0 +1 @@ +val main : unit -> transaction page diff --git a/demo/listShop.urp b/demo/listShop.urp index 219c6828..85d318d4 100644 --- a/demo/listShop.urp +++ b/demo/listShop.urp @@ -1,4 +1,3 @@ -debug list listFun @@ -36,7 +36,13 @@ hello.urp link.urp -<p>This is my second favorite.</p> +<p>In <tt>link.ur</tt>, we see how easy it is to link to another page. The Ur/Web compiler guarantees that all links are valid. We just write some Ur/Web code inside an "antiquote" in our XML, denoting a transaction that will produce the new page if the link is clicked.</p> + +form.urp + +<p>Here we see a basic form. The type system tracks which form inputs we include, and it enforces that the form handler function expects a record containing exactly those fields, with exactly the proper types.</p> + +<p>In the implementation of <tt>handler</tt>, we see the notation <tt>{[...]}</tt>, which uses type classes to inject values of different types (<tt>string</tt> and <tt>bool</tt> in this case) into XML. It's probably worth stating explicitly that XML fragments <i>are not strings</i>, so that the type-checker will enforce that our final piece of XML is valid.</p> listShop.urp diff --git a/lib/basis.urs b/lib/basis.urs index de4204b3..212cccc6 100644 --- a/lib/basis.urs +++ b/lib/basis.urs @@ -366,15 +366,19 @@ val option : unit -> tag [Value = string] select [] [] [] val submit : ctx ::: {Unit} -> use ::: {Type} -> fn [[Form] ~ ctx] => unit - -> tag [Action = $use -> transaction page] + -> tag [Value = string, Action = $use -> transaction page] ([Form] ++ ctx) ([Form] ++ ctx) use [] (*** Tables *) -val tabl : unit -> tag [Border = int] [Body] [Body, Table] [] [] -val tr : unit -> tag [] [Body, Table] [Body, Tr] [] [] -val th : unit -> tag [] [Body, Tr] [Body] [] [] -val td : unit -> tag [] [Body, Tr] [Body] [] [] +val tabl : other ::: {Unit} -> fn [other ~ [Body, Table]] => + unit -> tag [Border = int] ([Body] ++ other) ([Body, Table] ++ other) [] [] +val tr : other ::: {Unit} -> fn [other ~ [Body, Table, Tr]] => + unit -> tag [] ([Body, Table] ++ other) ([Body, Tr] ++ other) [] [] +val th : other ::: {Unit} -> fn [other ~ [Body, Tr]] => + unit -> tag [] ([Body, Tr] ++ other) ([Body] ++ other) [] [] +val td : other ::: {Unit} -> fn [other ~ [Body, Tr]] => + unit -> tag [] ([Body, Tr] ++ other) ([Body] ++ other) [] [] (** Aborting *) |