[Jakarta-tapestry Wiki] Update of "CheckingForRequiredValidator" by ScottWalter

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The following page has been changed by ScottWalter:
http://wiki.apache.org/jakarta-tapestry/CheckingForRequiredValidator

New page:
If you have a custom validation delegate (class that extends 
ValidationDelegeate) you may want to display a required field marker next to 
the field when the page is presented to your visitors.  

If you are migrating a 3.0 application you will want to override writeSuffix() 
like this:

{{{
public void writeSuffix(IMarkupWriter writer, IRequestCycle cycle, 
IFormComponent component, IValidator validator) {
                if(component.getBinding("validator")!=null) {
                        ExpressionBinding expressionBinding = 
(ExpressionBinding) component.getBinding("validator");
                        BaseValidator singleValidator = (BaseValidator) 
expressionBinding.getObject();
                        if(singleValidator.isRequired()) {

                          writer.printRaw("&nbsp");
                          writer.begin("span");
                          writer.attribute("class", "required-marker");
                          writer.beginEmpty("img");
                          writer.attribute("src","images/required.jpg");
                          writer.attribute("alt","required field");
                          writer.attribute("align","middle");
                          writer.end();
                        }
                }
}
}}}

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