How to deal with array of images that has different aspect ratio from one another? | Next.js | Page 1

safe summit Feb 11, 2024, 4:33 AM

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How to deal with array of images that has different aspect ratio from one another?

sullen thistleBOT Feb 11, 2024, 4:33 AM

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Hi @safe summit. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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Next.js provides several ways to handle images with different aspect ratios.

Responsive Images: You can render a responsive image that stretches with the viewport. You'll need to set sizes as well as style (or className). Here's an example of how to do this:

import Image from 'next/image'
import me from '../photos/me.jpg'
 
export default function Author() {
 return (
 <Image
 src={me}
 alt="Picture of the author"
 sizes="100vw"
 style={{
 width: '100%',
 height: 'auto',
 }}
 />
 )
}

You can try it out here (https://image-component.nextjs.gallery/responsive) (source (https://nextjs.org/docs/app/api-reference/components/image#responsive-images)).

Responsive Image with Aspect Ratio: If the source image is a dynamic or a remote url, you will also need to provide width and height to set the correct aspect ratio of the responsive image:

import Image from 'next/image'
 
export default function Page({ photoUrl }) {
 return (
 <Image
 src={photoUrl}
 alt="Picture of the author"
 sizes="100vw"
 style={{
 width: '100%',
 height: 'auto',
 }}
 width={500}
 height={300}
 />
 )
}

You can try it out here (https://image-component.nextjs.gallery/responsive) (source (https://nextjs.org/docs/app/api-reference/components/image#responsive-images)).

Responsive Image with fill: If you don't know the aspect ratio, you will need to set the fill prop and set position: relative on the parent. Optionally, you can set object-fit style depending on the desired stretch vs crop behavior:

#

import Image from 'next/image'
 
export default function Page({ photoUrl }) {
 return (
 <div style={{ position: 'relative', width: '500px', height: '300px' }}>
 <Image
 src={photoUrl}
 alt="Picture of the author"
 sizes="500px"
 fill
 style={{
 objectFit: 'contain',
 }}
 />
 </div>
 )
}

You can try it out here (https://image-component.nextjs.gallery/fill) (source (https://nextjs.org/docs/app/api-reference/components/image#responsive-image-with-fill)).

Remember, the `width` and `height` attributes are used to infer the correct aspect ratio of image and avoid layout shift from the image loading in. The `width` and `height` do not determine the rendered size of the image file (source (https://nextjs.org/docs/app/building-your-application/optimizing/images#remote-images)).

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safe summit Feb 11, 2024, 4:36 AM

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sullen thistle ```jsx import Image from 'next/image' export default function Page({ photoUrl ...

@sullen thistle I have tried using fill and it actually works perfectly. However, it's trying to render a bigger image that I want it to render. How do i force it to render a pretty small image and just resize it with css classes so that it won't eat up much network resources?

sullen thistleBOT Feb 11, 2024, 4:36 AM

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Let me check the knowledge base for you. One moment! :books:

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You can optimize the image size by using the sizes prop in the next/image component. The sizes prop provides information about how wide the image will be at different breakpoints when using layout="responsive" or layout="fill".

For example, if you want to limit the width of the image to a maximum of 256px, you can update your code to use sizes like this:

<Card>
  <Image layout="fill" sizes="256px" src="..." />
</Card>

This will serve an optimized image of 256px width, which will be resized according to your CSS classes.

Remember, by default, a variant will be available for every device size (https://nextjs.org/docs/api-reference/next/image#device-sizes) configured. But you can also specify image sizes (https://nextjs.org/docs/api-reference/next/image#image-sizes) that will be concatenated to the variants generated by device sizes when using layout="responsive" or layout="fill" (source (https://vercel.com/templates/next.js/reduce-image-bandwidth-usage)).

Also, to manage your Image Optimization usage and costs, consider reducing the variability in query string parameters for `src` prop and minimize the amount of times you change the `src` property during a billing period (source (https://vercel.com/docs/image-optimization/managing-image-optimization-costs)).

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safe summit Feb 11, 2024, 4:52 AM

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@sullen thistle How about gifs? I have some gifs using the image components but these seems to not have been converted into a better format like webm as stated in the lighthouse report. Is there an additional configuration that I would have to do in order to correctly render gifs in a newer format?

sullen thistleBOT Feb 11, 2024, 4:52 AM

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Let me check the knowledge base for you. One moment! :books:

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The Next.js Image Optimization API automatically detects the browser's supported image formats via the request's Accept header. If the Accept header matches more than one of the configured formats, the first match in the array is used. However, if the source image is animated (like a GIF), the Image Optimization API will fallback to the original image's format (source (https://nextjs.org/docs/pages/api-reference/components/image-legacy#acceptable-formats)).

This means that animated GIFs will not be converted to a newer format like WebP or AVIF. They will be served in their original GIF format. This is because converting an animated GIF to another format could potentially result in loss of the animation.

If you want to serve your animated images in a more efficient format like WebM, you would need to convert them manually before serving. There are many online tools available that can help you convert GIFs to WebM or other formats. After converting, you can then use the `next/image` component to serve the converted images.

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safe summit Feb 11, 2024, 4:54 AM

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@sullen thistle Can't I force convert it into a WEBP file as well? I do not mind losing the animation in this case

sullen thistleBOT Feb 11, 2024, 4:54 AM

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Let me check the knowledge base for you. One moment! :books:

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If you don't mind losing the animation, you can indeed convert your GIFs to WebP format. However, this conversion needs to be done manually before serving the images, as Next.js Image Optimization API does not automatically convert animated images to other formats.

There are many online tools and libraries available that can help you convert GIFs to WebP. After converting, you can then use the next/image component to serve the converted images.

Here's an example of how you might use the next/image component to serve a WebP image:

import Image from 'next/image'

export default function MyComponent() {
  return (
    <Image
      src="/path/to/image.webp"
      alt="Description of image"
      width={500}
      height={300}
    />
  )
}

Remember to replace "/path/to/image.webp" with the actual path to your WebP image. The width and height props should be set to the dimensions of the image.

Also, keep in mind that not all browsers support WebP. You might want to have a fallback in place for browsers that do not support this format. You can do this by using the `<picture>` element and providing multiple sources in different formats. However, this approach does not use the `next/image` component and will not benefit from the automatic optimizations provided by Next.js (source (https://nextjs.org/docs/pages/api-reference/components/image#formats)).

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#

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safe summit Feb 11, 2024, 5:20 AM

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@sullen thistle I am using the image component but still getting a lot of issues with regards to LCP, here is how my stats look like right now:

Phase
% of LCP
Timing
TTFB
3%
450 ms
Load Delay
0%
0 ms
Load Time
0%
0 ms
Render Delay
97%
13,090 ms

As you can see, there's this huge render delay.

This is how I did the relevant image component:

                                                <div className='h-[130px] sm:h-[200px] md:h-[260px] lg:h-[90px] relative block'>
                                                    <Image referrerPolicy='no-referrer' fill sizes='200px' priority alt={`此图像是标题为${article.title}的文章的封面图像`} src={article.image} className="w-full rounded-sm object-cover" />
                                                </div>

sullen thistleBOT Feb 11, 2024, 5:20 AM

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Let me check the knowledge base for you. One moment! :books:

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The Largest Contentful Paint (LCP) metric measures the time from when the page starts loading to when the largest content element in the viewable screen is fully displayed. A good LCP time is considered to be 2.5 seconds or less (source (https://vercel.com/docs/speed-insights/metrics)).

In your case, the render delay is quite high, which is likely contributing to a poor LCP score. This could be due to a number of factors, including the size of your images, the number of images you're loading, or other performance issues on your page.

Here are a few suggestions based on the information provided:

Image Size: Ensure your images are not larger than they need to be. The next/image component automatically serves correctly sized images for each device, using modern image formats like WebP and AVIF (source (https://nextjs.org/docs/app/building-your-application/optimizing/images)).
Priority: You're already using the priority prop, which is good. This tells Next.js to prioritize loading of this image (source (https://nextjs.org/docs/app/api-reference/components/image#priority)).
Image Optimization: Next.js provides automatic image optimization. However, if your images are hosted on a different domain, you'll need to add the domain to the domains array in your next.config.js file (source (https://nextjs.org/docs/app/building-your-application/optimizing/images#configuration)).
Other Performance Issues: The render delay could also be caused by other factors on your page, such as JavaScript blocking the main thread, or other resource-intensive operations. You might want to use a tool like Google's Lighthouse to analyze your page and get more detailed performance recommendations.

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Remember, improving LCP is often about improving the overall performance of your page. The faster your page can load and render content, the better your LCP will be.

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@safe summit kapa.ai is still learning and improving, please let us know how it did by reacting below

safe summit Feb 11, 2024, 5:24 AM

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@sullen thistle

I have realized that it's rendering a much higher image, why is that?
fill sizes='200px'
I have both of these on my image component, visually it looks fine. However, the image itself that is rendered is 576 x 1024. I thought the sizes prop sets a limit to the maximum width the image's intristic value can be?

sullen thistleBOT Feb 11, 2024, 5:24 AM

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Let me check the knowledge base for you. One moment! :books:

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The sizes prop in the next/image component does indeed provide information about how wide the image will be at different breakpoints. However, it's important to note that the actual image size that gets downloaded can depend on various factors, including the device's pixel density and the viewport size.

When you pass a sizes prop to the next/image component, the browser uses this information to decide which image size to download from the automatically generated srcset. The srcset contains different versions of the image at different sizes, and the browser chooses an image that is the same size or larger than the viewport. If you don't specify a sizes value, a default value of 100vw (full screen width) is used (source (https://nextjs.org/docs/app/api-reference/components/image#sizes)).

In your case, you've specified sizes='200px', which tells the browser that the image will be 200px wide. However, if the device's pixel density is 2x, the browser will choose an image that is 400px wide from the srcset. If the pixel density is 3x, it will choose an image that is 600px wide, and so on.

Furthermore, the fill layout mode you're using tells the next/image component to stretch the image both vertically and horizontally to fill the container, while preserving the image's aspect ratio. This could also result in the image being larger than the specified sizes value (source (https://nextjs.org/docs/app/api-reference/components/image#fill)).

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If you're seeing an image size of 576 x 1024 being rendered, it could be because the browser is choosing a larger image from the `srcset` based on the device's pixel density and the viewport size. It could also be due to the `fill` layout mode stretching the image to fill its container.

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safe summit Feb 11, 2024, 5:44 AM

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@sullen thistle I have inspected the image and saw that all links inside my srcset are using the same image with the same resolution and file size, why is that? Shouldn't there be breakpoints as to how big the images should be?

sullen thistleBOT Feb 11, 2024, 5:44 AM

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Let me check the knowledge base for you. One moment! :books:

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The srcset attribute in an img tag is supposed to contain a list of different image sources that the browser can choose from, based on the device's pixel density and the size of the viewport. However, if all the links in your srcset are pointing to the same image with the same resolution and file size, it means that there's no variety of image sizes for the browser to choose from.

In Next.js, when you use the next/image component, it automatically generates a srcset with different image sizes. This is done to optimize the loading of images based on the device's characteristics and network conditions. The next/image component does this by appending parameters to the image URL to request a resized version of the image from the Next.js Image Optimization API (source (https://nextjs.org/docs/app/api-reference/components/image#srcset)).

If you're not seeing this behavior, it could be due to a few reasons:

Image Source: The Next.js Image Optimization API only works with images that are served from the same origin as your Next.js app, or from an allowed image domain as specified in your next.config.js file. If your images are served from a different domain, you'll need to add the domain to the domains array in your next.config.js file (source (https://nextjs.org/docs/app/building-your-application/optimizing/images#configuration)).
Configuration: Check your next.config.js file to ensure that you have the correct configuration for the images property. You can specify a list of device width breakpoints using the deviceSizes property, and a list of image widths using the imageSizes property (source (https://nextjs.org/docs/app/api-reference/components/image#advanced)).

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Image Component Usage: Ensure that you're using the next/image component correctly. For example, you should provide a width and height prop to the Image component to specify the size of the image. If you're using the fill layout mode, you should also provide a sizes prop to specify how wide the image will be at different breakpoints (source (https://nextjs.org/docs/app/api-reference/components/image#sizes)).

If you've checked all of these and you're still seeing the same image in your `srcset`, it might be a good idea to open an issue on the Next.js GitHub repository (https://github.com/vercel/next.js/issues) to get help from the Next.js team.

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safe summit Feb 11, 2024, 6:21 AM

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@sullen thistle Should I load iframes in a client component?

sullen thistleBOT Feb 11, 2024, 6:21 AM

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Let me check the knowledge base for you. One moment! :books:

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Yes, it's generally a good idea to load iframes in a client component. This is because iframes rely on browser APIs that are not available during server-side rendering.

In Next.js, you can use dynamic imports to load a component containing an iframe only on the client side. Here's an example:

import dynamic from 'next/dynamic'

const DynamicComponentWithNoSSR = dynamic(
  () => import('../components/MyComponent'),
  { ssr: false }
)

export default function Home() {
  return (
    <div>
      <Header />
      <DynamicComponentWithNoSSR />
      <Footer />
    </div>
  )
}

In this example, MyComponent would contain your iframe. This component will only be imported and rendered on the client side, not during server-side rendering (source (https://nextjs.org/docs/app/building-your-application/optimizing/lazy-loading#importing-client-components)).

Remember, iframes can be heavy and slow to load, so it's a good idea to lazy load them to improve performance. You can do this by setting the `loading="lazy"` attribute on your iframe.

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safe summit Feb 11, 2024, 6:24 AM

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@sullen thistle
According to https://web.dev/articles/optimizing-content-efficiency-loading-third-party-javascript?utm_source=lighthouse&utm_medium=lr#how_do_you_load_third-party_script_efficiently

Use async or defer
JavaScript execution is parser blocking. This means when the browser encounters a script it must pause DOM construction, hand this over to the JavaScript engine and allow script execution before proceeding with DOM construction.

The async and defer attributes change this behavior.

With async, the browser downloads the script asynchronously while it continues to parse the HTML document. When the script finishes downloading, parsing is blocked while the script executes.

How would I implement async on my iframe on my client component?

web.dev

Loading Third-Party JavaScript | Articles | web.dev

Third-party scripts provide a wide range of useful functionality, making the web more dynamic. Learn how to optimize the loading of third-party scripts to reduce their impact on performance.

sullen thistleBOT Feb 11, 2024, 6:24 AM

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Let me check the knowledge base for you. One moment! :books:

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The async attribute is specific to <script> tags and cannot be directly applied to <iframe> tags. However, you can achieve a similar effect with iframes by lazy loading them. This can be done using the loading="lazy" attribute, which defers the loading of the iframe until it reaches a calculated distance from the viewport.

Here's an example of how you can apply this to an iframe in a client component:

<iframe src="<https://www.example.com"> loading="lazy"></iframe>

In this example, the iframe will not load until it's about to scroll into view, which can help improve performance on your page.

If you need to load a script inside the iframe asynchronously, you can include the async attribute in the <script> tag inside the iframe's content. However, this would require control over the content being loaded in the iframe, which might not be possible if you're loading content from a third party.

Remember, when using iframes, it's important to specify a width and height to prevent layout shifts as the iframe loads. If the size of the iframe is not known ahead of time, consider using placeholder content or skeleton screens to hold the space until the iframe loads (source (https://nextjs.org/docs/app/building-your-application/deploying/static-exports#browser-apis)).

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safe summit Feb 11, 2024, 6:35 AM

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@sullen thistle

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading

How do I load the third-party code only after the page has finished loading?

sullen thistleBOT Feb 11, 2024, 6:35 AM

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Let me check the knowledge base for you. One moment! :books:

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In Next.js, you can load third-party scripts after your page has primarily finished loading by using the next/script component with the strategy property set to afterInteractive or lazyOnload.

Here's how you can do it:

import Script from 'next/script'

export default function Page() {
  return (
    <>
      <Script src="<https://example.com/script.js"> strategy="afterInteractive" />
    </>
  )
}

In this example, the script at <https://example.com/script.js> will be loaded after some hydration on the page occurs. This is the default strategy of the Script component and should be used for any script that needs to load as soon as possible but not before any first-party Next.js code (source (https://nextjs.org/docs/app/api-reference/components/script#afterinteractive)).

If you want to load the script later during browser idle time, you can use the lazyOnload strategy:

import Script from 'next/script'

export default function Page() {
  return (
    <>
      <Script src="<https://example.com/script.js"> strategy="lazyOnload" />
    </>
  )
}

In this example, the script will be loaded later during browser idle time (source (https://nextjs.org/docs/app/building-your-application/optimizing/scripts#strategy)).

Remember, loading third-party scripts can have a significant impact on your page's performance. It's a good idea to limit the number of third-party scripts you use and load them as late as possible to ensure your page loads quickly for your users.

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safe summit Feb 11, 2024, 6:37 AM

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The problem is that it is in an iframe @sullen thistle

sullen thistleBOT Feb 11, 2024, 6:37 AM

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Let me check the knowledge base for you. One moment! :books:

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If the third-party code is within an iframe, you can't directly control when the iframe content is loaded as you would with a script tag. However, you can defer the loading of the iframe itself until your page has primarily finished loading.

One way to do this is by using a state in your React component to control when the iframe is added to the DOM. Here's an example:

import { useEffect, useState } from 'react';

export default function Page() {
  const [isLoaded, setIsLoaded] = useState(false);

  useEffect(() => {
    setIsLoaded(true);
  }, []);

  return (
    <>
      {isLoaded && (
        <iframe src="<https://example.com"></iframe>>
      )}
    </>
  );
}

In this example, the iframe is not added to the DOM until after the component has mounted, which is after your page has primarily finished loading.

Another approach is to use the loading="lazy" attribute on the iframe, which defers the loading of the iframe until it reaches a calculated distance from the viewport:

<iframe src="<https://example.com"> loading="lazy"></iframe>

In this example, the iframe will not load until it's about to scroll into view, which can help improve performance on your page.

Remember, when using iframes, it's important to specify a width and height to prevent layout shifts as the iframe loads. If the size of the iframe is not known ahead of time, consider using placeholder content or skeleton screens to hold the space until the iframe loads.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

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safe summit Feb 11, 2024, 6:41 AM

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sullen thistle ---------------------- If the third-party code is within an iframe, you can't di...

@sullen thistle How does useEffect get called here? Is it called automatically when the page is loaded?

sullen thistleBOT Feb 11, 2024, 6:41 AM

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Let me check the knowledge base for you. One moment! :books:

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Yes, the useEffect hook in React is called automatically after the first render (also known as mounting) of the component, and then on every subsequent re-render when the dependencies of the effect change.

Here's a basic example:

useEffect(() => {
  // This code runs after the component is first rendered
  // and then every time the component re-renders and the dependencies change
}, [/* dependencies */]);

In the array (the second argument to useEffect), you specify the dependencies of your effect. If any of these dependencies change between renders, the effect will run again.

If you pass an empty array ([]) as the second argument to useEffect, the effect will only run once after the first render, similar to componentDidMount in class components. This is because an empty array means there are no dependencies, so the effect never needs to re-run since its dependencies never change.

In the context of a Next.js page, `useEffect` will run after the component returned by the page function is first rendered on the client side. It won't run during server-side rendering because `useEffect` is a browser-side effect and there are no browser APIs available during server-side rendering.

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#

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safe summit Feb 11, 2024, 7:11 AM

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@sullen thistle

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. Learn how to minimize third-party impact.TBT```

Still the same problem even wtih use effect. I don't want it to block the page render, it doesn't have be there on the initial page load, it can be rendered later. What should I do? The suggestions on google and stackoverflow is to load it asynchronously but I am not sure how I would be able to achieve that with an iframe, I thought useEffect would do the trick but it seems like it didn't

sullen thistleBOT Feb 11, 2024, 7:11 AM

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Let me check the knowledge base for you. One moment! :books:

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If the third-party code is within an iframe and it's blocking the main thread, one approach could be to delay the loading of the iframe until after the main content of the page has loaded. This can be achieved by setting the src of the iframe dynamically using state in your React component.

Here's an example:

import { useEffect, useState } from 'react';

export default function Page() {
  const [iframeSrc, setIframeSrc] = useState(null);

  useEffect(() => {
    setIframeSrc('<https://example.com'>);
  }, []);

  return (
    <>
      {iframeSrc && (
        <iframe src={iframeSrc}></iframe>
      )}
    </>
  );
}

In this example, the src of the iframe is initially null, so the iframe doesn't load any content when the component is first rendered. Then, in the useEffect hook, we set the src to the URL of the third-party content. This happens after the component has mounted, which is after the main content of the page has loaded.

This approach ensures that the third-party content in the iframe doesn't block the main thread during the initial page load. However, it doesn't make the iframe load asynchronously in the same way that the async attribute does for script tags. The content of the iframe will still load in a blocking manner once the src is set, but this will happen after the main content of the page has loaded.

Remember, when using iframes, it's important to specify a width and height to prevent layout shifts as the iframe loads. If the size of the iframe is not known ahead of time, consider using placeholder content or skeleton screens to hold the space until the iframe loads.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

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safe summit Feb 11, 2024, 11:15 AM

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@sullen thistle Does blur placeholders for Image component help improve LCP?

sullen thistleBOT Feb 11, 2024, 11:15 AM

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Let me check the knowledge base for you. One moment! :books:

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The use of blur placeholders in the Next.js Image component can potentially improve the Largest Contentful Paint (LCP) metric, but it depends on the specific use case.

LCP measures the render time of the largest image or text block visible within the viewport. If the largest contentful element on your page is an image that's being loaded with a blur placeholder, it could help improve LCP in the following ways:

Perceived performance: The blur placeholder can provide a preview of the image before it loads, which can make the page feel faster to the user.
Prevent layout shifts: By providing dimensions to the Image component, you can reserve space for the image on the page, which can prevent layout shifts as the image loads. This can indirectly improve LCP by ensuring that the largest contentful element doesn't change after the image loads.

However, it's important to note that the blur placeholder itself does not directly improve LCP. LCP measures when the largest contentful element has finished rendering, and using a blur placeholder doesn't change when the actual image finishes loading.

Also, keep in mind that using a blur placeholder can increase the size of your HTML document because the placeholder image is inlined as a base64-encoded string. This could potentially have a negative impact on performance metrics like First Contentful Paint (FCP) and Time to Interactive (TTI).

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In conclusion, while blur placeholders can improve the perceived performance and prevent layout shifts, they don't directly improve LCP and could potentially have a negative impact on other performance metrics. It's always a good idea to test the performance impact of using blur placeholders in your specific use case (source (https://nextjs.org/docs/pages/api-reference/components/image#placeholder)).

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@safe summit kapa.ai is still learning and improving, please let us know how it did by reacting below

safe summit Feb 11, 2024, 11:44 AM

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@sullen thistle Is it a good idea to never specify width and height for images? and instead create a wrapper and adjust the height and width of the wrapper?

sullen thistleBOT Feb 11, 2024, 11:44 AM

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It's generally not recommended to leave out the width and height attributes on images, including when using the next/image component in Next.js. Here's why:

Prevent Layout Shifts: Specifying a width and height for images allows the browser to allocate the correct amount of space on the page for the image before it loads. This can prevent layout shifts, which occur when elements on the page move around as images load in. Layout shifts can be disruptive to the user experience and are considered a Core Web Vital by Google (source (https://nextjs.org/docs/pages/building-your-application/optimizing/images#image-sizing)).
Performance: The next/image component uses the width and height to calculate the aspect ratio of the image and to generate the correct sizes for the srcset attribute. This allows the browser to choose the most appropriate image size to download based on the device's pixel density and the size of the viewport, which can improve performance.

While wrapping an image in a container and controlling the size of the container can give you more flexibility in terms of layout, it doesn't provide the same benefits in terms of preventing layout shifts and optimizing performance.

If you don't know the size of your images ahead of time, there are several things you can do:

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Use the fill layout mode, which causes the image to expand to fill its parent element. You can then control the size of the image by setting the size of the parent element (source (https://nextjs.org/docs/pages/building-your-application/optimizing/images#image-sizing)).
If you're serving images from a source that you control, consider modifying your image pipeline to normalize the images to a specific size.
If your application is retrieving image URLs using an API call, you may be able to modify the API call to return the image dimensions along with the URL.

Remember, the `next/image` component is designed to work well on a page alongside standard `<img>` elements, so you can use a mix of `next/image` and `<img>` elements as needed based on your specific use case.

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@safe summit kapa.ai is still learning and improving, please let us know how it did by reacting below

safe summit Feb 11, 2024, 11:45 AM

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sullen thistle ---------------------- It's generally not recommended to leave out the `width` a...

What i meant is not the width/height prop but instead the css styling itself @sullen thistle

sullen thistleBOT Feb 11, 2024, 11:45 AM

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Let me check the knowledge base for you. One moment! :books:

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When it comes to CSS styling, it's still generally a good practice to specify width and height for images. This is because:

Preventing Layout Shifts: As mentioned earlier, specifying a width and height for images can prevent layout shifts as the images load. This applies to CSS width and height as well.
Maintaining Aspect Ratio: Specifying both width and height in CSS helps maintain the aspect ratio of the image. If only one dimension is specified, the image could become distorted if its aspect ratio doesn't match the aspect ratio of the space it's being rendered in.

However, there are cases where controlling the size of a wrapper around the image might be beneficial:

Responsive Design: If you're building a responsive design where the size of the image needs to change based on the viewport size, it might be easier to control the size of a wrapper around the image using CSS media queries, and then set the width and height of the image to 100%.
Complex Layouts: If the image is part of a more complex layout where its size needs to be controlled in relation to other elements, it might be easier to control the size of a wrapper around the image.

Here's an example of how you can control the size of an image by controlling the size of a wrapper:

<div style={{ width: '100%', height: 'auto' }}>
  <Image src="..." layout="fill" objectFit="contain" />
</div>

In this example, the div acts as a wrapper around the Image component. The layout="fill" prop tells the Image component to expand to fill its parent element, and the objectFit="contain" prop ensures that the image maintains its aspect ratio while fitting within the dimensions of the parent element.

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Remember, the specific approach you should use depends on your specific use case and the layout requirements of your page. It's always a good idea to test different approaches to see which one works best for your needs.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@safe summit kapa.ai is still learning and improving, please let us know how it did by reacting below

safe summit Feb 11, 2024, 11:48 AM

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@sullen thistle I have set className = "dark" for my html tag on my layout.tsx file but the issue is that it is it not defaulting to dark mode, why is that?

sullen thistleBOT Feb 11, 2024, 11:48 AM

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Let me check the knowledge base for you. One moment! :books:

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Setting a className of "dark" on the html tag in your layout file won't automatically set your application to dark mode. The className is just a CSS class, and it doesn't have any inherent functionality. It's used to style elements, and you would need corresponding CSS that applies dark mode styles when the "dark" class is present.

If you're using a CSS-in-JS library like styled-components, you might be using a ThemeProvider to provide theme variables to your components. In this case, you would need to switch the theme provided by the ThemeProvider to switch between light and dark mode.

Here's an example from one of the extracts:

import { ThemeProvider } from 'styled-components';
import useDarkMode from 'use-dark-mode';

function MyApp({ Component, pageProps }: AppPropsWithLayout) {
  const darkMode = useDarkMode(true); // Pass the default mode (true) to useDarkMode

  return (
    <ThemeProvider theme={{ mode: darkMode.value ? 'dark' : 'light' }}>
      {/* Use darkMode.value to set the correct theme mode */}
      <GlobalStyles locale={locale} />
      {getLayout(<Component {...pageProps} />)}
    </ThemeProvider>
  );
}

In this example, the useDarkMode hook is used to get the current mode (light or dark), and this value is passed to the ThemeProvider. The components in your application can then use this theme value to apply different styles for light and dark mode.

If you're not using a CSS-in-JS library and are instead using regular CSS or a preprocessor like Sass, you would need to write CSS that applies different styles when the "dark" class is present. Here's a basic example:

body {
  background-color: white;
  color: black;
}

body.dark {
  background-color: black;
  color: white;
}

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In this example, the page will be in light mode by default, and it will switch to dark mode when the "dark" class is present on the body element.

Remember, the specific approach you should use depends on how you're handling styles in your application. If you're using a CSS-in-JS library, you'll likely want to use a ThemeProvider or a similar mechanism. If you're using regular CSS or a preprocessor, you'll need to write CSS that applies different styles based on the presence of a "dark" class (source (https://github.com/vercel/next.js/issues/31712)).

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@safe summit kapa.ai is still learning and improving, please let us know how it did by reacting below

safe summit Feb 11, 2024, 12:26 PM

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@sullen thistle Is this normal?

sullen thistleBOT Feb 11, 2024, 12:26 PM

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Let me check the knowledge base for you. One moment! :books:

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I'm sorry, but your question is a bit vague. Could you please provide more context or details? Are you referring to a specific behavior in Next.js or a particular issue you're experiencing? The more information you provide, the better I can assist you.

#How to deal with array of images that has different aspect ratio from one another?

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Remember, improving LCP is often about improving the overall performance of your page. The faster your page can load and render content, the better your LCP will be.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If you're seeing an image size of 576 x 1024 being rendered, it could be because the browser is choosing a larger image from the srcset based on the device's pixel density and the viewport size. It could also be due to the fill layout mode stretching the image to fill its container.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If you've checked all of these and you're still seeing the same image in your srcset, it might be a good idea to open an issue on the Next.js GitHub repository (https://github.com/vercel/next.js/issues) to get help from the Next.js team.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, iframes can be heavy and slow to load, so it's a good idea to lazy load them to improve performance. You can do this by setting the loading="lazy" attribute on your iframe.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, loading third-party scripts can have a significant impact on your page's performance. It's a good idea to limit the number of third-party scripts you use and load them as late as possible to ensure your page loads quickly for your users.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, when using iframes, it's important to specify a width and height to prevent layout shifts as the iframe loads. If the size of the iframe is not known ahead of time, consider using placeholder content or skeleton screens to hold the space until the iframe loads.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

In the context of a Next.js page, useEffect will run after the component returned by the page function is first rendered on the client side. It won't run during server-side rendering because useEffect is a browser-side effect and there are no browser APIs available during server-side rendering.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, when using iframes, it's important to specify a width and height to prevent layout shifts as the iframe loads. If the size of the iframe is not known ahead of time, consider using placeholder content or skeleton screens to hold the space until the iframe loads.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, the next/image component is designed to work well on a page alongside standard <img> elements, so you can use a mix of next/image and <img> elements as needed based on your specific use case.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, the specific approach you should use depends on your specific use case and the layout requirements of your page. It's always a good idea to test different approaches to see which one works best for your needs.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

I'm sorry, but your question is a bit vague. Could you please provide more context or details? Are you referring to a specific behavior in Next.js or a particular issue you're experiencing? The more information you provide, the better I can assist you.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If you're seeing an image size of 576 x 1024 being rendered, it could be because the browser is choosing a larger image from the `srcset` based on the device's pixel density and the viewport size. It could also be due to the `fill` layout mode stretching the image to fill its container.

If you've checked all of these and you're still seeing the same image in your `srcset`, it might be a good idea to open an issue on the Next.js GitHub repository (https://github.com/vercel/next.js/issues) to get help from the Next.js team.

Remember, iframes can be heavy and slow to load, so it's a good idea to lazy load them to improve performance. You can do this by setting the `loading="lazy"` attribute on your iframe.

In the context of a Next.js page, `useEffect` will run after the component returned by the page function is first rendered on the client side. It won't run during server-side rendering because `useEffect` is a browser-side effect and there are no browser APIs available during server-side rendering.

Remember, the `next/image` component is designed to work well on a page alongside standard `<img>` elements, so you can use a mix of `next/image` and `<img>` elements as needed based on your specific use case.