问题
I'm using slick.js to build a carousel. However, even though I change the attribute from src
to data-lazy
the images still get loaded before I scroll to that image. I suspect that it's because I have srcset
tag in in my image. My question is how to prevent browser to load responsive image or how to do lazy-loading for responsive images properly.
This is the sample of my img tag
<img data-lazy="better_me.jpg" srcset="better_me.jpg 400w, better_me.jpg 200w" class="avatar photo avatar-200" alt="better_me" width="200" height="200" sizes="(min-device-resolution: 1.6) 400px, 200px">
回答1:
lazySizes is just working fine. You need to alter your markup into something like this however.
<img data-src="better_me.jpg" data-srcset="better_me2.jpg 400w, better_me.jpg 200w" class="avatar photo avatar-200 lazyload" data-sizes="auto" alt="better_me" width="200" height="200" />
Note srcset
is changed to data-srcset
and data-lazy
is changed to data-src
. Additionally you must add the class lazyload.
Your sizes
attribute didn't made too much sense. Maybe you want to use x descriptors instead? Or simply use sizes="200px"
? I don't know. I simply switched it to data-sizes="auto"
, so it gets automatically calculated for you. (But in that case the image dimension has to be computable before the image is loaded.)
lazySizes indeed loads images before they get in view. This is a big improvement for user experience. A user, who scrolls something into view doesn't want to wait then. A lazyloader that starts downloading an image after it is already in view disrupts the user experience.
One nice thing about lazySizes is that this lazy loader checks whether the browser is currently heavily downloading and decides on this fact, whether it only downloads in view images or to also preload near view images.
But if you don't want this you can control this by setting the lazySizes' expand
and expFactor
options.
回答2:
I recommend responsivelyLazy. The implementation is SEO-friendly and does not mess your HTML code. Here is a snippet:
<div class="responsively-lazy" style="padding-bottom:68.44%;">
<img
alt=""
src="images/2500.jpg"
srcset="data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="
data-srcset="images/400.jpg 400w, images/600.jpg 600w, images/800.jpg 800w, images/1000.jpg 1000w, images/1500.jpg 1500w, images/2000.jpg 2000w"
/>
As you can see the value in the src
attribute is not modified.
Read more at http://ivopetkov.com/b/lazy-load-responsive-images/
回答3:
Usually, to implement lazy loading in HTML, instead of src
or srcset
attributes, we use data-src
or data-srcset
so that browser does not load images during speculative parsing. Later on, when Javascript is executed, and the user has scrolled near the image element, we load the actual image and update the src
or srcset
attribute’s value.
Two very popular lazy loading libraries lazysizes and vanilla-lazyload support responsive images out of the box.
Here are a few examples of using lazysizes.
Lazy loading responsive images in srcset and sizes
<img
sizes="(min-width: 1000px) 930px, 90vw"
data-srcset="small.jpg 500w,
medium.jpg 640w,
big.jpg 1024w"
data-src="medium.jpg"
class="lazyload" />
Using low quality placeholder in lazy loading
<img
src="low-quaity-placeholder.jpg"
sizes="(min-width: 1000px) 930px, 90vw"
data-srcset="small.jpg 500w,
medium.jpg 640w,
big.jpg 1024w"
data-src="medium.jpg"
class="lazyload" />
Lazy loading images in picture element
<picture>
<source
data-srcset="500.jpg"
media="(max-width: 500px)" />
<source
data-srcset="1024.jpg"
media="(max-width: 1024px)" />
<source
data-srcset="1200.jpg" />
<img src="fallback-image.jpg"
data-src="1024.jpg"
class="lazyload"
alt="image with artdirection" />
</picture>
You can learn more about responsive images from this guide - https://imagekit.io/responsive-images
来源:https://stackoverflow.com/questions/31840467/how-to-do-lazy-loading-image-with-srcset