Thanks, Thiago, but it lacks AJAX. I'd like the validator to behave like any
other client-side validator except that it asks the server to help, eg. to
validate that a name has not already been used.
Geoff
On 18/06/2010, at 12:24 PM, Thiago H. de Paula Figueiredo wrote:
> On Thu, 17 Jun 2010 22:20:45 -0300, Geoff Callender
> <geoff.callender.jumpst...@gmail.com> wrote:
>
>> Hi all,
>
> Hi!
>
> This is an example of a RGB string validator that I created for my Tapestry
> courses (basic and advanced):
>
> public class RGBValidator extends AbstractValidator<Void, String> {
>
> final private static Pattern PATTERN =
> Pattern.compile("[0-9A-Fa-f]{6}");
>
> final private RenderSupport renderSupport;
>
> final private Asset javascript;
>
> public RGBValidator(
> AssetSource assetSource, RenderSupport renderSupport) {
>
> super(null, String.class, "rgb-validation");
> this.renderSupport = renderSupport;
> javascript = assetSource.getClasspathAsset(
>
> "br/com/arsmachina/cursotapestry/validacao/rgb.js");
>
> }
>
> public void render(Field field, Void constraintValue,
> MessageFormatter formatter, MarkupWriter writer,
> FormSupport formSupport) {
>
> String message = buildMessage(field, formatter);
>
> // adds JavaScript validation
> formSupport.addValidation(field, "rgb", message, null);
>
> // includes rgb.js in the page
> renderSupport.addScriptLink(javascript);
>
> // adds a hint to the user. just an example of generating
> // HTML inside a validator.
> writer.element("span", "class", "hint");
> writer.write("Must be filled with 6 digits or letters from A to
> F.");
> writer.end();
>
> }
>
> @Override
> public void validate(Field field, Void constraintValue,
> MessageFormatter formatter, String value)
> throws ValidationException {
>
> if (PATTERN.matcher(value).matches() == false) {
> String message = buildMessage(field, formatter);
> throw new ValidationException(mensagem);
> }
>
> }
>
> private String buildMesssage(Field field, MessageFormatter formatter) {
> return formatter.format(field.getLabel());
> }
>
> }
>
> rgb.js:
>
> Tapestry.Validator.rgb = function(field, message) {
> var regexp = /[0-9A-F]{6}/i;
> field.addValidator(function(value) {
> if (regexp.test(value) == false && value.length > 0) {
> throw message;
> }
> });
> };
>
> --
> Thiago H. de Paula Figueiredo
> Independent Java, Apache Tapestry 5 and Hibernate consultant, developer, and
> instructor
> Owner, Ars Machina Tecnologia da Informação Ltda.
> http://www.arsmachina.com.br
>
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