JSP CUSTOM TAG LIBRARIES
Specifies that a value must be supplied by the user to a specified input field. If validation fails, the body of this tag is evaluated.
Be sure the clientvalidate attribute of the input tag you are validating does not equal "none." The clientvalidate attribute of the form tag containing the input tag should be set to "true."
Note You cannot use this tag to validate the radio and checkbox tags. If a value must be supplied, be sure to specify a default value for these tags.
Contexts
Valid in:
alert
2) msgkey attribute value
3) message attribute value
4) body of this tag
HTML Attributes
See the Common HTML tag attributes section for definitions of the following standard HTML tag attributes:
style