Function request_idle_callback_with_handle 

pub fn request_idle_callback_with_handle(
    cb: impl Fn() + 'static,
) -> Result<IdleCallbackHandle, JsValue>

Queues the given function during an idle period using Window.requestIdleCallback, returning a cancelable handle.

Note about Context

The callback is called outside of the reactive ownership tree. This means that it does not have access to context via use_context. If you want to use context inside the callback, you should either call use_context in the body of the component, and move the value into the callback, or access the current owner inside the component body using Owner::current and reestablish it in the callback with Owner::with.