在页面加载之前预加载 nextjs 图像

Question

Ignoring the fact that this is generally considered a bad practice, I'm trying to understand how I can preload a set of images either before a page transition or prior to rendering my page. My use case requires quite a few large image files to be displayed at the same time and animated onto the screen. I'd like to essentially have a loading spinner on the page while the initial set of large images is downloaded and cached in the browser and then I can show them all at once.

If I want to do this with standard react, I can do something like this:

    await Promise.all(
        images.map(async (url) => {
            return new Promise((resolve) => {
                const image = new Image();
                image.src = url;
                image.onload = () => resolve(true);
            });    
        })
    )}

And then have an isLoading boolean get flipped when everything is done loading. With the nextjs Image components, though, I can't load those initial images until they are actually added to the dom. The URL for those images changes based on various conditions so I can't really use the original solution to preload them.

Is there a way to force the browser to download the image sources generated from my nextjs <Image> components before they get added to the dom?

Answer 1

Have you tried adding priority=true to the Image component?

Read details here: next-image docs