Currently learning GWT, and I still cannot imagine how to build a
*rule-based* controller for a dynamically composed form -- preferably
a multipage one, and -- due to GWT concepts -- obviously running on
the client side in JavaScript.
The idea is to have a multi-sections/multi-tabs registration form
that
(a) shows its questions according to "question specs" from a backend
database,
(b) gives the users instant input validation feedback via local-
centralized validation
rules base,
(c) controls the "questionary behaviour" after some local-centralized
"fill out" rules,
e.g.,
* "When user fills out InputField A, hide section/tab C".
* "When user checks CheckBox B, also check boxes Y,Z
automatically".
* "When user selects D,E and F then show {widget} G".
* etc.
(d) finally submits all the collected data (from each form page/tab)
to a server-side
service (i.e. 'submit' button on last form page/section triggers
RPC).
The main point is to optimally have all the validation, filter, action/
behaviour, etc. rules centralized at one place -- hence the rule-based
approach.
The main issues are:
1. Which way to go for realizing such a "JavaScript Rule Engine"
solution in GWT?
2. Does there already exist a GWT framework or Composite targeting
*rule-based*
form controllers for the client side?
Hope some more experienced GWT programmers can help me further on this
topic.
Kindly regards,
Alessandro
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