| Returns the function name in JavaScript or a Javascript code snippet
used to validate the value at the client, or null if no client
verification is supported.
There are two formats of the return value:
Format 1:
Syntax: function_name
Example: "zkVld.noEmpty"
What Really Happens:
zkVld.noEmpty('id') is called at the client side
to validate the input, where id is the component's identifier.
Format 2:
Syntax: function_name(arg1, arg2, arg3)
where arg could be #{EL_expression}
Example: "myValid(#{self},#{when},'more')"
What Really Happens:
myValid($e('id'),new Date('2007/06/03'),'more')
is called at the client side
to validate the input, where id is the component's identifier.
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