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ab-interchange
Advanced tools
Readme
AB-interchange is a small, dependencie free and vanilla JavaScript component that conditionnaly load things depending on media queries and it also has a powerfull lazy-loading option:
It's damn small: about 2500 bytes (uglyfied and GZipped). It is used in the French website of ENGIE.
Have a look at the Codepen demonstration.
Install with npm:
npm install --save ab-interchange
Install with yarn:
yarn add ab-interchange
You can then import it in your JS bundle (webpack, ES6, browserify...):
import abInterchange from 'ab-interchange';
Or loading the js right before </body>
if you are not using a builder.
Because of the usage of matchMedia
and requestAnimationFrame
, compatibility start with IE 10. To rise compatibility up to IE 9, you can add matchMedia polyfill and requestAnimationFrame polyfill.
Follow AB-mediaQuery readme to configure it the way you like depending on your needs. For exemple:
abMediaQuery({
bp: {
smallOnly: 'screen and (max-width: 767px)',
mediumOnly: 'screen and (min-width: 768px) and (max-width: 1024px)',
medium: 'screen and (min-width: 768px)',
largeOnly: 'screen and (min-width: 1025px) and (max-width: 1280px)',
large: 'screen and (min-width: 1025px)'
}
});
Then you only need to initialize with AB.interchange()
or with some options:
abInterchange({
mode: 'background',
lazy: false,
lazySettings: {
placeholder: false, // trick to prevent reflow of the page
offscreen: 1.5, // load items only when in the view + 0.5
delayed: false,
layout: 'fluid' // can be "fixed" to fixed dimensions (not fluid)
}
});
Then use data-ab-interchange
attribute to pass options on each elemets if needed.
data-ab-interchange-src
attribute is where you define different sources and breakpoints defined with AB-mediaQuery.
It should contain a list of arrays with the path to the asset and the breakpoint name. Beware to respect mobile first order. Order is VERY important!
Recommanded usage to prevent reflow with lazy loading enabled:
<div
alt=""
width="100"
height="75"
data-ab-interchange='{"lazy": true, "lazySettings": {
"placeholder": true,
"offscreen": 1,
"delayed": 2000
}}"'
data-ab-interchange-src="[xxx, smallOnly], [xxx, medium]">
</div>
If your images have different ratio depending on media query:
<div
alt=""
width='{"smallOnly": 20, "medium": 50}'
height='{"smallOnly": 20, "medium": 50}'
data-ab-interchange='{"lazy": true, "lazySettings": {
"placeholder": true,
"offscreen": 1,
"delayed": 2000
}}"'
data-ab-interchange-src="[xxx, smallOnly], [xxx, medium]">
</div>
Or on normal img tags:
<img
alt=""
width="100"
height="75"
data-ab-interchange='{"lazy": true}"'
data-ab-interchange-src="[xxx, smallOnly], [xxx, medium]"/>
<picture>
<source srcset="xxx" media="(min-width: 80em)"/>
<source srcset="xxx" media="(min-width: 64em)"/>
<source srcset="xxx" media="(min-width: 48em)"/>
<source srcset="xxx"/>
<img
alt=""
width="100"
height="75"
data-ab-interchange
data-ab-interchange-src="[xxx, smallOnly], [xxx, medium]"/>
</picture>
<div
data-ab-interchange='{"mode": "background", "lazy": true, "lazySettings": {"offscreen": 1.5}"}'
data-ab-interchange-src="[xxx, smallOnly], [xxx, medium]">
</div>
<div
data-ab-interchange='{"mode": "ajax"}'
data-ab-interchange-src="[xxx, smallOnly], [xxx, mediumOnly]">
</div>
replaced.ab-interchange
event is automatically triggered when an IMG (or else) changed. For IMG and HTML, it's fired only when the new content is loaded, for background-image, immediatly, because it does not impact the layout:
window.addEventListener('replaced.ab-interchange', function(e){
console.log(e.detail.element);
});
FAQs
AB-interchange: While responsive image loading is not really an easy task even today, here is a solution to manage conditional (based on breakpoints) loading of img, background-image or even HTML content.
The npm package ab-interchange receives a total of 19 weekly downloads. As such, ab-interchange popularity was classified as not popular.
We found that ab-interchange demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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