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From "Ariel Pablo Klein" <apkl...@eml.cc>
Subject Proposal or Discussion: FieldLabel changes
Date Sun, 27 Mar 2005 19:55:37 GMT
Hi, I'm new on this list, I subscribed yesterday, but the reason that I
subscribed it's to propose some changes in form components if are voted or
can be discussed by us.
My English isn't so good, but I think that you can understand me.

Googling I found this demo:
http://www.sitepoint.com/examples/simpletricks/form-demo.html

Based on an article called "Simple Tricks for More Usable Forms".
http://www.sitepoint.com/print/1273


first that I made to achieve this example on tapestry was:

1. I made on a copy of FieldLabel, it's to change the renderComponent
adjusting it to render <label> tag. I know that can be done on
validatedelegate labelprefix, but I think that this code has to be part of
fieldLabel component making it customizable by CSS like in the demo, and
associating FieldLabel to <Label> tag of HTML 4. 

http://www.w3.org/TR/REC-html40/interact/forms.html

2. I made visible isInError(IFormComponent component) on my own
ValidateDelegate because on ValidationDelegate is protected and isn't
visible by fieldlabel to know if a field has errors or not.
3. at this moment I made my own script file to achieve javascript
validation, but could be done by standardizing in all form components.

The code as you can imagine it's very simple:

        writer.begin("label");
        writer.attribute("for", field.getId());

        MyValidationDelegate myDelegate = ((MyValidationDelegate) delegate);
        if (myDelegate.isInError(field)) {
            writer.attribute("class", "problem");
        } else {
            IValidator validator = myDelegate.getValidator(field);
            if (validator != null && validator.isRequired())
                writer.attribute("class", "required");
            else
                writer.attribute("class", "completed");
        }

        if (getRaw()) {
            writer.printRaw(displayName);
        } else {
            writer.print(displayName);
        }

        writer.end();

Maybe more things can be modified. But this could be the start of discussion
about this. 

Maybe in a near future validators could services too (sounds crazy :D) and
forms could be validated thru live validators.

Ariel Pablo Klein



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