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feat(nuxt-img): responsive prop #155

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merged 4 commits into from
Jan 25, 2021
Merged

feat(nuxt-img): responsive prop #155

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207d6bf
feat(nuxt-img): responsive prop
pi0 Jan 22, 2021
b397b8f
fix: force compute responsive for static server
pi0 Jan 22, 2021
f51f822
fix: width/height
pi0 Jan 22, 2021
aa0ab69
Merge branch 'dev' into feat/image-responsive
pi0 Jan 25, 2021
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2 changes: 1 addition & 1 deletion playground/pages/index.vue
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@
<NuxtImg src="https://nuxtjs.org/logos/nuxt.svg" width="400" height="400" />

<h2>JPEG image inside project</h2>
<NuxtImg src="/images/damavand.jpg" />
<NuxtImg responsive src="/images/damavand.jpg" />

<h2>JPEG image from remote url</h2>
<NuxtImg src="https://upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Aconcagua2016.jpg/600px-Aconcagua2016.jpg" />
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33 changes: 31 additions & 2 deletions src/runtime/components/nuxt-img.vue
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Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,12 @@
:height="height"
:src="nSrc"
:alt="nAlt"
v-bind="nAttrs"
>
</template>

<script lang="ts">
import { generateAlt, useObserver } from '~image'
import { generateAlt, useObserver, parseSize } from '~image'

const EMPTY_GIF = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'

Expand All @@ -32,7 +33,8 @@ export default {

// options
preset: { type: String, required: false, default: undefined },
provider: { type: String, required: false, default: undefined }
provider: { type: String, required: false, default: undefined },
responsive: { type: Boolean, required: false, default: false }
},
data () {
return {
Expand All @@ -53,6 +55,15 @@ export default {
modifiers: this.modifiers
}).url
},
nAttrs () {
const attrs: any = {}
if (this.responsive) {
const { sizes, srcSet } = this.getResponsive()
attrs.sizes = sizes
attrs.srcSet = srcSet
}
return attrs
},
modifiers () {
return {
width: this.width,
Expand All @@ -64,6 +75,12 @@ export default {
}
}
},
created () {
if (process.server && process.static) {
// Force compute sources into ssrContext
this.getResponsive()
}
},
mounted () {
if (this.usePlaceholder) {
this.observe()
Expand All @@ -73,6 +90,18 @@ export default {
this.unobserve()
},
methods: {
getResponsive () {
const sizes = this.$img.getSizes(this.src, {
sizes: this.sizes,
width: parseSize(this.width),
height: parseSize(this.height),
modifiers: this.modifiers
})
return {
sizes: sizes.map(({ width }) => `(max-width: ${width}px) ${width}px`),
srcSet: sizes.map(({ width, src }) => `${src} ${width}w`)
}
},
observe () {
this._removeObserver = useObserver(this.$el, () => {
this.usePlaceholder = false
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