Checks whether the attribute was passed to this tag.
Returns True if the attribute is available; otherwise returns False.
public boolean attributeExists(String name)
getAttribute, getAttributeList
| Parameter | Description |
|---|---|
|
name |
Name of the attribute to check (case-insensitive) |
The following example checks whether the user passed an attribute named DESTINATION to the tag; if not, it throws an exception:
if ( ! request.attributeExists("DESTINATION") )
{
throw new Exception(
"Missing DESTINATION parameter",
"You must pass a DESTINATION parameter in "
"order for this tag to work correctly." ) ;
} ;