JSValue jsXMLHttpRequestOnprogress(ExecState* exec, const Identifier&, const PropertySlot& slot) { JSXMLHttpRequest* castedThis = static_cast<JSXMLHttpRequest*>(asObject(slot.slotBase())); UNUSED_PARAM(exec); XMLHttpRequest* imp = static_cast<XMLHttpRequest*>(castedThis->impl()); if (EventListener* listener = imp->onprogress()) { if (JSObject* jsFunction = listener->jsFunction(imp->scriptExecutionContext())) return jsFunction; } return jsNull(); }