I checked the wiki. The basic technique is already there, at the bottom
of this page:
http://wiki.apache.org/tapestry/CheckingForRequiredValidator
I learned that the code could be simplified. My isRequired() method --
left over from an earlier Tapestry version -- wasn't needed. The
writeAttributes() method boils down to:
if (isInError()) {
writer.attribute("class", "error");
}
else if (component.isRequired()) {
writer.attribute("class", "required-field");
}
Andreas Bulling wrote:
>Nice one - thanks for that! ;)
>Perhaps that's something for the Wiki...
>
>Andreas
>
>On 14. Jun 2006 - 17:18:28, Bryan Lewis wrote:
>| 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;
>| }
>
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