Here's what's been working well for us. Our custom ValidationDelegate
extends Tapestry's ValidationDelegate and overrides the
writeAttributes() method, which is documented as "Does nothing. Override
in a subclass to decorate fields." We emit a
class="required-field" attribute. It's up to the app's stylesheet to
define the appearance.
public void writeAttributes(IMarkupWriter writer,
IRequestCycle cycle,
IFormComponent component,
IValidator validator)
{
if (isInError()) {
writer.attribute("class", "error");
}
else if (isRequired(component)) {
writer.attribute("class", "required-field");
}
}
/** Returns true if the component has a Required validator. */
public boolean isRequired(IFormComponent component)
{
boolean retval = false;
if (component instanceof ValidatableField) {
Object validators = ((ValidatableField)
component).getValidators();
if (validators != null
// The docs say getValidators() is "coerced into an Iterator
// of Validators", but I get a Collection. Allow for
either.
Iterator it = null;
if (validators instanceof Iterator) {
it = (Iterator) validators;
}
else if (validators instanceof Collection) {
it = ((Collection) validators).iterator();
}
assert it != null;
while (it.hasNext()) {
Validator validator = (Validator) it.next();
if (validator.isRequired()) {
retval = true;
break;
}
}
}
}
return retval;
}
Phillip Rhodes wrote:
>I am using tapestry validation successfully for required fields. All
>works well. However, I need to display a required indicator to the user
>so that they know before submitting the form that these fields are
>required. Currently, users must submit the form to enable the "required"
>decorations.
>
>It would be nice if I could toggle on the validation decorations in the
>form on the initial presentation of the form to the user, so they don't
>have to guess which fields are required when they are filling out the form
>the first time.
>
>any pointers would be appreciated.
>
>
>
>
>
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