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app-img

v1.0.0

Published

<app-image> a lazy image loading custom element for considerate user experiences

Downloads

2

Readme

Features

  • Waits to start loading until the image is in view
  • Neat custom properties api for modifying presentation layer
  • Fade in animation
  • No dependencies
  • Ready for avatars to galleries

note: this custom element doesn't provide any polyfills

Get Started

  • npm i app-img
  • load the web component in your HTML, perhaps via JS like this import 'app-img.element'

Intended Usage / API

<app-img src='...'></app-img>
<app-img src='...' viewport='#scrollcontainer'></app-img>
<app-img src='...' no-shadow></app-img>
<app-img src='...' style='--fade-speed:0'></app-img>
<app-img src='...' style='--fit:none'></app-img>
<app-img src='...' style='--loading-bg:black;--loading-text_color:white;'></app-img>
$('app-img').addEventListener('loaded', ({target}) => 
  console.log(target))

Changing Presentation

Change the custom property values on the <app-img> node.

--loading-bg: any|css|color|type; 
/* default: hsl(0,0%,85%) */

--loading-text_color: hex|hsl|rgb|etc;
/* default: hsl(0,0%,70%) */

--fit: fill|contain|cover|none|scale-down;
/* default: cover */

--position: left|top|50%|20px|etc; 
/* default: initial */

--fade-speed: s|ms; 
/* default: 0.5s */

Changing Behavior

<!-- opt out of shadowDOM -->
<app-img no-shadow></app-img>

<!-- opt out of animation -->
<app-img style='--fade-speed:0;'></app-img>

<!-- 
  when you need to specify the observed scroll container 
  pass a querySelector string into the attribute
-->
<app-img viewport='#scrollview'></app-img>