[Seaside] Validating inputs before calling callback using AJAX serialization

[Esteban A. Maringolo]

Hi all,

I'm trying to find a clean and "proper" way of dealing with the validation
of user entered values in forms _before_ they hit the callback block.

And based on such validation result be able to respond one script or
another.

Let's say I have something like

html textInput
  onChange: (html jQuery ajax serializeThis);
  script: (html jQuery script: [:s | "fancy things that modify the web UI"
];
  callback: [:value | self doSomethingWithValue: value]

The problems with that are:
a) I can't "sanitize" the input before it reaches the callback block, I
have to do it within the callback block.
b) I have no way to return one script for a successful validation, and one
for a failing one.

I'd like something like

A)
html textInput
  onChange: (html jQuery ajax
    serializeThisValidating: validationBlock
    successScript:  [:s | "fancy things that modify the web UI" ]
    failureScript:  [:s | "modify the web UI reporting the failure" ]);
  callback: [:value | self doSomethingWithValue: value]

or...
B)
html textInput
  onChange: (html jQuery ajax serializeThis);
  callback: [:value | self doSomethingWithValue: value ]
  validation: aBlock
  successScript: [:s | "fancy things that modify the web UI" ]
  failureScript:   [:s | "modify the web UI reporting the failure" ].


I think that the A option is the best alternative, since all the "special
handling" will happen in the context of the JQAjax and maybe a special kind
of JSAjaxCallback).

Also I don't know how this would work in the context of _several_ validated
callbacks, but I plan to make it work in the context of #serializeThis only.

But I'm sure there is a simpler way of achieving this, since I tend to make
things complicated.

Any suggestions?


Esteban A. Maringolo
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