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Diffstat (limited to 'demo/prose')
| -rw-r--r-- | demo/prose | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -231,6 +231,12 @@ crud2.urp <p>This example shows another application of <tt>Crud.Make</tt>. We mix one standard column with one customized column. We write an underscore for the <tt>Inject</tt> field of meta-data, since the type class facility can infer that witness.</p> +crud3.urp + +<p>One thing that is unclear from the previous examples is how to provide more complex, multi-input widgets for taking input meant for particular fields. The signature of <tt>Crud.Make</tt> forces every widget to define exactly one input. The <tt><subform></tt> tag, the simpler cousin of the <tt><subforms></tt> tag that we saw earlier, provides a fix for this problem. Via <tt><subform></tt>, an arbitrary form can be turned into a single record-valued input.</p> + +<p>We use that possibility here to define a silly widget for a <tt>string</tt> column, which concatenates the values entered into two different textboxes.</p> + alert.urp <p>Ur/Web makes it easy to write code whose execution should be distributed between the web server and client web browsers. Server-side code is compiled to efficient native code, and client-side code is compiled to JavaScript. Ur/Web programmers don't need to worry about these details, because the language and standard library provide a uniform ML-like interface for the whole process.</p> |