Kevin Powell - Community•13mo ago

Is there a way to lazy load an embedded iframe? (Google Maps/youtube video)

I have youtube and google maps iframes on a website, which load immediately and hurt Lighthouse scores a lot. Any ideas?

66 Replies

MarkBoots•13mo ago

<iframe src="..." loading="lazy"> is already there for most browsers. Only FF is a bit behind, but I think they are rolling it out in the next release (december 19th?) https://caniuse.com/loading-lazy-attr

suhaylmvOP•13mo ago

it still loads a lot of js on page load

suhaylmvOP•13mo ago

suhaylmvOP•13mo ago

Here's the website I'm working on if you want to test it out yourself https://www.amigosdelretiro.com/

Tu Lugar Favorito para Jugar al Ajedrez en Madrid - La Cabaña

Unete a cientos de personas que vienen cada dia para disfrutar de nuestras actividades, jugar al ajedrez y participar en torneos

ἔρως•13mo ago

how about you only initialize google maps when the container is visible? you can use an intersection observer for this

vince•13mo ago

Also it's saying your 3rd party code (google maps) is blocking the main thread, and suggests to only load after your page has finished loading. So try using the defer or async attributes on your google scripts

ἔρως•13mo ago

thats also a good solution i would use defer

suhaylmvOP•13mo ago

I'm so sorry for not responding @ἔρως @vince , with the new betterdiscord theme I can't see any changes on posts now I found a way to enable notifications on posts. didn't know about that earlier How can I do that? It's just an iframe, there aren't any google scripts

MarkBoots•13mo ago

remove the iframe src, and add it after the page load

suhaylmvOP•13mo ago

can you elaborate? how do I add it after the page load?

MarkBoots•13mo ago

in your script (with defer) you can select the iframe element and set the src

const iframe = document.querySelector("iframe");
iframe.src = "https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3387.566481098533!2d-3.685281591511207!3d40.413765905744626!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0xd42289ffa59b9c7%3A0x514c9aebb4ecd4d!2sLa%20Caba%C3%B1a.%20Asociaci%C3%B3n%20Amigos%20del%20Retiro!5e0!3m2!1ses-419!2ses!4v1702800521259!5m2!1ses-419!2ses"

const iframe = document.querySelector("iframe");
iframe.src = "https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3387.566481098533!2d-3.685281591511207!3d40.413765905744626!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0xd42289ffa59b9c7%3A0x514c9aebb4ecd4d!2sLa%20Caba%C3%B1a.%20Asociaci%C3%B3n%20Amigos%20del%20Retiro!5e0!3m2!1ses-419!2ses!4v1702800521259!5m2!1ses-419!2ses"

vince•13mo ago

very cool, never thought of that what's the benefit of that though when you have loading=lazy? That would defer it, so wouldn't setting the src manually be redundant?

MarkBoots•13mo ago

loading lazy could be useful for other iframe content than googlemaps. don't know what is happening exactly with lazy load, but maps has a lot going on in the url params

vince•13mo ago

ah so you're saying that loading=lazy might not be enough to totally defer the maps call, so it's better to defer it manually inside a script essentially?

MarkBoots•13mo ago

i guess so. but I didn't deepdive into it. This just came up to me as a quick solution

suhaylmvOP•13mo ago

it still loads content on every page load for me I also included a console.log in that script, and it executes on page load it doesn't happen to you right?

vince•13mo ago

Did you defer the script itself?

suhaylmvOP•13mo ago

<script defer>
  const iframe = document.querySelector("iframe");
  iframe.src =
    "https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3387.566481098533!2d-3.685281591511207!3d40.413765905744626!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0xd42289ffa59b9c7%3A0x514c9aebb4ecd4d!2sLa%20Caba%C3%B1a.%20Asociaci%C3%B3n%20Amigos%20del%20Retiro!5e0!3m2!1ses-419!2ses!4v1702800521259!5m2!1ses-419!2ses";
  console.log("arst");
</script>

<script defer>
  const iframe = document.querySelector("iframe");
  iframe.src =
    "https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3387.566481098533!2d-3.685281591511207!3d40.413765905744626!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0xd42289ffa59b9c7%3A0x514c9aebb4ecd4d!2sLa%20Caba%C3%B1a.%20Asociaci%C3%B3n%20Amigos%20del%20Retiro!5e0!3m2!1ses-419!2ses!4v1702800521259!5m2!1ses-419!2ses";
  console.log("arst");
</script>

like this: in astro

ἔρως•13mo ago

no, add it with an intersection observer defer doesn't do anything for inline scripts

vince•13mo ago

I was wondering about that, cool ohh that would be good too

ἔρως•13mo ago

no no, it would be perfect the iframe doesn't load until the user scrolls to it

vince•13mo ago

what if the user has a bad connection and they scroll to it and instead of it popping up quickly it takes 10 seconds to load? I know with google fonts you can preload it; can you do the same with google maps (without the performance hit of loading it all at once on page load)?

ἔρως•13mo ago

then it is a google problem, not yours it's just google maps you can preload google fonts, but you also can use display: swap or whatever the property is, for the page to keep going and then swap the text with the newly downloaded font and if you don't host the fonts yourself, you're in violation of the GPDR but seriously, if it takes 30 minutes to load, it's fine just add a spinner or something on top of it or under it

vince•13mo ago

if only it was this simple 😂 spinner/loading animation is a good idea though

ἔρως•13mo ago

spinner solves the issue

suhaylmvOP•13mo ago

I think it works now!

<script>
  let observer = new IntersectionObserver(
    (entries, observer) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          loadGoogleMaps();
          console.log("intersecting...");
          observer.unobserve(entry.target);
        }
      });
    },
    { rootMargin: "0px", threshold: 1.0 },
  );

  observer.observe(document.querySelector(".map-container"));

  function loadGoogleMaps() {
    let mapContainer = document.querySelector(".map-container");
    let iframe = document.createElement("iframe");

    iframe.src =
      "https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3387.566481098533!2d-3.685281591511207!3d40.413765905744626!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0xd42289ffa59b9c7%3A0x514c9aebb4ecd4d!2sLa%20Caba%C3%B1a.%20Asociaci%C3%B3n%20Amigos%20del%20Retiro!5e0!3m2!1ses-419!2ses!4v1702800521259!5m2!1ses-419!2ses";
    iframe.width = "100%"; 
    iframe.height = "100%"; 
    iframe.style.border = "0";
    iframe.title = "Mapa de la direccion de la Cabaña";

    mapContainer.appendChild(iframe);
  }
</script>

<script>
  let observer = new IntersectionObserver(
    (entries, observer) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          loadGoogleMaps();
          console.log("intersecting...");
          observer.unobserve(entry.target);
        }
      });
    },
    { rootMargin: "0px", threshold: 1.0 },
  );

  observer.observe(document.querySelector(".map-container"));

  function loadGoogleMaps() {
    let mapContainer = document.querySelector(".map-container");
    let iframe = document.createElement("iframe");

    iframe.src =
      "https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3387.566481098533!2d-3.685281591511207!3d40.413765905744626!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0xd42289ffa59b9c7%3A0x514c9aebb4ecd4d!2sLa%20Caba%C3%B1a.%20Asociaci%C3%B3n%20Amigos%20del%20Retiro!5e0!3m2!1ses-419!2ses!4v1702800521259!5m2!1ses-419!2ses";
    iframe.width = "100%"; 
    iframe.height = "100%"; 
    iframe.style.border = "0";
    iframe.title = "Mapa de la direccion de la Cabaña";

    mapContainer.appendChild(iframe);
  }
</script>

used a bit of help from gpt4 not gonna lie...

ἔρως•13mo ago

that looks horrible but yes, that should work

suhaylmvOP•13mo ago

anything to improve?

ἔρως•13mo ago

remove these lines:

    iframe.width = "100%";
    iframe.height = "100%"; 
    iframe.style.border = "0";
    iframe.title = "Mapa de la direccion de la Cabaña";

    iframe.width = "100%";
    iframe.height = "100%"; 
    iframe.style.border = "0";
    iframe.title = "Mapa de la direccion de la Cabaña";

suhaylmvOP•13mo ago

why?

ἔρως•13mo ago

well, do you have a .map-container? or is it just the iframe thrown there?

suhaylmvOP•13mo ago

yeah

ἔρως•13mo ago

well, you can (and should) size the iframe with css, to get the same effect you can add a css to apply the styles there to the iframe instead

suhaylmvOP•13mo ago

I removed the first 3 lines and it works the same I think not sure why I had that inside the iframe before I should leave the iframe title though nope, it broke I'll leave it as it is afaik iframes need width and height specified in attributes

ἔρως•13mo ago

the title is absolutely useless for an iframe it breaks if you don't add the css for it but well, leaving the other 3 lines in isn't the end of the world

suhaylmvOP•13mo ago

isn't it useful for accesibility? or maybe SEO

ἔρως•13mo ago

seo? no, google can't read the title from it accessibility? eh, never tested it, but i guess doesn't hurt

suhaylmvOP•13mo ago

ok thanks for helping me!

ἔρως•13mo ago

you can change the margin to be a little bit on the inside, so the iframe loads when it is actually visible

vince•13mo ago

https://www.deanlong.io/blog/google-crawl-and-index-iframe-seo

ἔρως•13mo ago

the iframe is loaded by javascript and javascript that detects the browser position for seo, use microdata or some other micro format

suhaylmvOP•13mo ago

https://www.amigosdelretiro.com/

Tu Lugar Favorito del Retiro para Jugar al Ajedrez - La Cabaña

Unete a cientos de personas que vienen cada dia para disfrutar de nuestras actividades, jugar al ajedrez y participar en torneos

suhaylmvOP•13mo ago

is there a way to set some margin to the intersection observer?

vince•13mo ago

I don't know if crawlers can index based off scroll, but I'm pretty sure they can "wait" for javascript content to load. I'd have to look into that

suhaylmvOP•13mo ago

so it loads the map a little earlier?

vince•13mo ago

dude the typography is really clean

suhaylmvOP•13mo ago

no idea

vince•13mo ago

great font choice

suhaylmvOP•13mo ago

thankss)

vince•13mo ago

yea I think it's the rootMargin property but I could be wrong

ἔρως•13mo ago

if it uses an headless instance of chrome for it, it's possible, but very computational expensive yes, it is

vince•13mo ago

<script>
  let observer = new IntersectionObserver(
    (entries, observer) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          loadGoogleMaps();
          console.log("intersecting...");
          observer.unobserve(entry.target);
        }
      });
    },
    { rootMargin: "0px", threshold: 1.0 }, // here
  );

...

<script>
  let observer = new IntersectionObserver(
    (entries, observer) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          loadGoogleMaps();
          console.log("intersecting...");
          observer.unobserve(entry.target);
        }
      });
    },
    { rootMargin: "0px", threshold: 1.0 }, // here
  );

...

ἔρως•13mo ago

yup, that's what i was talking about you should optimize your images the cover image is massive in images, you have 1.1mb our of 2.1mb for your website

vince•13mo ago

Also your cover image uses .avif which isn't supported in all browsers iirc, be careful with that

ἔρως•13mo ago

and the scroll is absolutely horrible on desktop you do have a few bugs with the animations personally? i hate these annoying animations with shit flying all over

vince•13mo ago

I like it but I think the site is a little bit too simple and I feel like you're using animations to make up for it. You have really good typography and color scheme going on though. Anyway offtopic lol

ἔρως•13mo ago

don't think the typography is the best for this section but the map, well ... it works, but you only have a gaping hole there and you don't put the gps coordinates there by the way, use the more semantically correct <address> element as well: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/address

suhaylmvOP•13mo ago

can you explain more in detail? totally agree, I was thinking a lot about this, but couldn't come up with anything at the end to make the design more rich I hope with time I'll come up with something you mean the beige section?

vince•13mo ago

i've been thinking a lot about this site lately. i think they do a really good job of keeping it simple but making it interesting https://grassrootsonline.org/. maybe you can get some inspiration from it

suhaylmvOP•13mo ago

I don't understand thanks, I'll check it out

ἔρως•13mo ago

the title yes you have the address, but not the gps coordinates

suhaylmvOP•13mo ago

why gps coordinates? ok.

ἔρως•13mo ago

well, gps coordinates are important for people to put it into google maps and find the place and also for old-school people who don't use google maps, but have a perfectly capable gps that's ok-ishly updated

suhaylmvOP•13mo ago

it's a place inside a park in the middle of the city, please tell me how the fuck a person can prefer using a gps instead of a mobile phone

ἔρως•13mo ago

old-school people

Gaming

Programming

Is there a way to lazy load an embedded iframe? (Google Maps/youtube video)