Obsolete since JSAPI 32
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
Determine if a given jsval
is null
.
Syntax
JSVAL_IS_NULL(v)
Description
JSVAL_IS_NULL(v)
is true
if v
is JSVAL_NULL
, which is the JavaScript null
value.
(Note:
is also JSVAL_IS_OBJECT
(JSVAL_NULL
)true
.)
Example
The following code snippet illustrates how a JavaScript variable, MyItem
, is conditionally tested in an if
statement to see if it contains a null value.
if (JSVAL_IS_NULL(MyItem)) { ... }