I've been able to create a Validator, but I am having problems getting the
Error Message to show up in my new Validator.
1.) First I copied one of the default T5 validators (I used the Required
class) -- here it is:
----------------------------------------------------------------------------------------------------------------------------------------------------
import static org.apache.tapestry.TapestryUtils.quote;
import org.apache.tapestry.Field;
import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.PageRenderSupport;
import org.apache.tapestry.ValidationException;
import org.apache.tapestry.Validator;
import org.apache.tapestry.ioc.MessageFormatter;
/**
* @author Doug.Schroeder
*/
public class MessageFieldValidator implements Validator<Void, Object> {
public Class<Void> getConstraintType() {
return null;
}
public String getMessageKey() {
return "messageFieldValidator";
}
public Class getValueType() {
return Object.class;
}
public boolean invokeIfBlank() {
return true;
}
public void render(Field field, Void constraintValue, MessageFormatter
formatter, MarkupWriter writer, PageRenderSupport pageRenderSupport) {
pageRenderSupport.addScript(
"MyDomain.Field.messageFieldValidator('%s', %s);",
field.getClientId(),
quote(buildMessage(formatter, field)));
}
public void validate(Field field, Void constraintValue, MessageFormatter
formatter, Object value)
throws ValidationException
{
if (value == "some value I am checking for")
throw new ValidationException(buildMessage(formatter,
field));
}
private String buildMessage(MessageFormatter formatter, Field field)
{
return formatter.format(field.getLabel());
}
}
----------------------------------------------------------------------------------------------------------------------------------------------------
2.) Next I added the following to my Module class:
----------------------------------------------------------------------------------------------------------------------------------------------------
public static void contributeFieldValidatorSource(
MappedConfiguration<String, Validator> configuration) {
configuration.add("messageFieldValidator", new
MessageFieldValidator());
}
----------------------------------------------------------------------------------------------------------------------------------------------------
3.) Next, in my component class, I turned on client-side validation:
----------------------------------------------------------------------------------------------------------------------------------------------------
<t:form t:id="myForm" clientValidation="true">
<label for="messageSubject"
class="editor-label">${message:message-subject.title}</label>
<t:textField t:id="messageSubject" class="editor-input"
t:validate="messageFieldValidator" />
<t:submit class="action-button submit-button" t:id="submit"
value="message:message-submit-button.title" />
</t:form>
----------------------------------------------------------------------------------------------------------------------------------------------------
4.) Finally, I added a piece of javascript that would render the client-side
validation:
----------------------------------------------------------------------------------------------------------------------------------------------------
if(typeof MyDomain == "undefined") { var MyDomain={}; };
MyDomain.Field = {
messageFieldValidator : function(field, message) {
Tapestry.addValidator(field, true, function(value, event) {
if (value == '')
event.recordError(message);
});
}
};
----------------------------------------------------------------------------------------------------------------------------------------------------
I am having problems getting the validation message to show up -- this is
what I see instead of a message:
[[missing key: messageFieldValidator]]
How do I link a message up with a validator? Also, is it possible to
override the default error message that shows at the top of the page (which
says "You must correct the following errors before you may continue.")?
jglanz wrote:
>
> Hey guys, I've been using T5 for a while and haven't needed to create my
> own validator until now and I am absolutely dumb founded for how to do
> it....any insight would be great.
>
> many thx, Jon
>
>
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