Loaded once the browser is idle
The page was ready without it. Right after the page loaded, the browser requested it in the background: see the first response.
Lazy pagelets
A part of the page that is not needed right away is not rendered with it. The page gets a placeholder,
and the browser asks for the pagelet when the placeholder becomes visible, or once the browser is idle.
Pagelet::lazy($url)
The placeholder of a pagelet class, loaded from the URL.
LazyPagelet::LOAD_VISIBLE
When the placeholder scrolls into view (the default).
LazyPagelet::LOAD_IDLE
Once the browser has nothing else to do.
$response->pagelet()
The endpoint answers with the pagelet, which replaces its placeholder.
Controller.php
// The page gets only a placeholder: nothing is rendered yet
$comments = CommentsPagelet::lazy(
route('comments.pagelet', $post),
placeholder: '<p>Loading the comments…</p>',
);
return view('post', compact('post', 'comments'));
// The endpoint
public function comments(Post $post)
{
return (new AsyncResponse())
->pagelet(new CommentsPagelet($post))
->send();
}Try it
Scroll down
Not loaded yet
Loaded when it becomes visible
Nothing was requested for this one until its placeholder scrolled into view. Infinite scroll works the same way: see the blog of the demo app.