pinafore/routes/_components/LazyImage.html

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<div class="lazy-image"
style="width: {{width}}px; height: {{height}}px; background: {{background}};">
{{#if displaySrc}}
<img
class="{{hidden ? 'hidden' : ''}} {{className || ''}}"
aria-hidden={{ariaHidden || ''}}
alt={{alt || ''}}
title={{alt || ''}}
src={{displaySrc}}
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:width
:height
/>
{{/if}}
</div>
<style>
.lazy-image {
overflow: hidden;
}
.lazy-image img {
transition: opacity 0.2s linear;
}
</style>
<script>
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import { mark, stop } from '../_utils/marks'
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export default {
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oncreate () {
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mark('LazyImage oncreate()')
let img = new Image()
let { src } = this.get()
let { fallback } = this.get()
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img.onload = () => {
requestAnimationFrame(() => {
this.set({
displaySrc: src,
hidden: true
})
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requestAnimationFrame(() => {
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this.set({hidden: false})
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})
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})
}
img.onerror = () => {
this.set({displaySrc: fallback})
}
img.src = src
stop('LazyImage oncreate()')
},
data: () => ({
displaySrc: void 0,
hidden: false,
ariaHidden: false
})
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}
</script>