Obsolete since JSAPI 36
This feature is obsolete.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.

Creates a JavaScript function from a text string.


JSFunction *
JS_CompileFunction(JSContext *cx, JSObject *obj,
    const char *name, unsigned int nargs, const char **argnames,
    const char *body, size_t length, const char *filename,
    unsigned int lineno);

JSFunction *
JS_CompileUCFunction(JSContext *cx, JSObject *obj,
    const char *name, unsigned int nargs, const char **argnames,
    const jschar *body, size_t length, const char *filename,
    unsigned int lineno);
Name Type Description
cx JSContext * The context in which to compile the function. Requires request. In a JS_THREADSAFE build, the caller must be in a request on this JSContext.
obj JSObject * Object with which the function is associated.
name const char * Name to assign the newly compiled function.
nargs unsigned int Number of arguments to pass to the function.
argnames const char ** Names to assign to the arguments passed to the function.
body const char * or const jschar * String containing the body of the function to compile.
length size_t The length, in characters, of body.
filename const char * Name of file or URL containing the function. Used to report filename or URL in error messages.
lineno unsigned int Line number. Used to report the offending line in the file or URL if an error occurs.


JS_CompileFunction compiles a function from a text string, bytes, and optionally associates it with a JS object, obj. JS_CompileUCFunction is the Unicode version of the function.

name is the name to assign to the newly created function. nargs is the number of arguments the function takes, and argnames is a pointer to the first element of an array of names to assign each argument. The number of argument names should match the number of arguments specified in nargs.

body is a string containing the source code of the function. length is the length of the source code in characters.

filename is the name of the file (or URL) containing the function. This information is used in error messages if an error occurs during compilation. Similarly, lineno is used to report the line number where an error occurred during compilation.

If both obj and name are non-null, the new function becomes a method of obj. (A new property is defined on obj with the given name and the new Function object as its value.)

On success, JS_CompileFunction and JS_CompileUCFunction return a pointer to the newly compiled function. On error or exception, they return NULL.

See Also