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JS GetElement

Find a specified numeric property of an object and return its current value.


JSBool JS_GetElement(JSContext *cx, JSObject *obj, jsint index, jsval *vp);
Name Type Description
cx JSContext * The context in which to perform the property lookup. Requires request. In a JS_THREADSAFE build, the caller must be in a request on this JSContext.
obj JSObject * The object to search for the element.
index jsint Index of the element to look up.
vp jsval * Out parameter. On success, *vp receives the current value of the element, if it exists, and JSVAL_VOID otherwise.


JS_GetElement examines a specified JS object, obj, and its prototype chain, for an element or numeric property numbered index.

If the element exists, JS_GetElement sets *vp to the element's current value. If not, it sets *vp to JSVAL_VOID and returns JS_TRUE (to indicate no error occurred). If the search fails with an error or exception, JS_GetElement returns JS_FALSE, and the value left in *vp is undefined.

See Also

MXR ID Search for JS_GetElement

JS_DefineElement, JS_DeleteElement, JS_GetArrayLength, JS_IsArrayObject, JS_LookupElement, JS_NewArrayObject, JS_SetArrayLength, JS_SetElement

Document Tags and Contributors

 Last updated by: Jorend,