html2: Support for HTML programming
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This package contains libraries to support HTML programming.
It provides a similar API as package `html`.
In contrast to package `html`, this library implements
dynamic web pages without server processes waiting for answers
form the client (web browser). Thus, it does not need
the Curry Port Name Server (CPNS), the HTML/CGI Registry, etc.
For this purpose, web forms are a bit more restricted:
each web form has an IO action to read the data required for
the form and a result page shown after submitting the form.
To implement the event handlers inside a form without a process,
the read IO action is executed again when a form is submitted.
All operations and smart constructors to implement
interactive web pages are defined in the library `HTML.Base`.
A form inside a web page must be defined as a
**public top-level operation** of type `HtmlFormDef`, like
myForm :: HtmlFormDef String
myForm = formDefWithID "Module.myForm" readData viewData
The first argument of a form definition must be the qualified name
of the operation (this will be checked by `curry2cgi`).
The second argument is an IO action to read some data
used in the form, and the third argument is the actual view
of the form which usually contains buttons with event handlers
that are invoked when a form is submitted.
Some simple examples for dynamic web pages can be found in the
directory `examples`.
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