Entry: JS_LookupElement (Function)
Summary: Determines if a specified element or numeric property exists.
Syntax:
JSBool JS_LookupElement(JSContext *cx, JSObject *obj,
jsint index, jsval *vp);
Argument Type Description
cx JSContext * Pointer to a JS context from which to derive runtime information.
obj JSObject * Object to search on for the element.
index jsint Index number of the element to look up.
vp jsval * Pointer to a variable into which to store the current value of the element if it has a value. If not, vp is set to JSVAL_VOID.
Description:
JS_LookupElement examines a specified JS object, obj, for an element or numeric property numbered index. If the element exists, vp is set either to the current value of the property if it has a value, or to JSVAL_VOID if it does not, and JS_LookupElement returns JS_TRUE. On error, such as running out of memory during the search, JS_LookupElement returns JS_FALSE, and vp is undefined.
See also:
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