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nuxt-img.vue
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nuxt-img.vue
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<template>
<img
:key="nSrc"
:width="width"
:height="height"
:src="nSrc"
:alt="nAlt"
v-bind="nAttrs"
>
</template>
<script lang="ts">
import { generateAlt, useObserver, parseSize } from '~image'
const EMPTY_GIF = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'
export default {
name: 'NuxtImg',
props: {
// input source
src: { type: String, required: true },
// <img> attributes
width: { type: [String, Number], required: false, default: undefined },
height: { type: [String, Number], required: false, default: undefined },
alt: { type: String, required: false, default: undefined },
loading: { type: String, default: undefined },
// modifiers
format: { type: String, required: false, default: undefined },
quality: { type: [Number, String], required: false, default: undefined },
background: { type: String, required: false, default: undefined },
fit: { type: String, required: false, default: undefined },
modifiers: { type: Object, required: false, default: undefined },
// options
preset: { type: String, required: false, default: undefined },
provider: { type: String, required: false, default: undefined },
responsive: { type: Boolean, required: false, default: false }
},
data () {
return {
usePlaceholder: this.loading === 'lazy'
}
},
computed: {
nAlt () {
return this.alt ?? generateAlt(this.src)
},
nSrc () {
if (this.usePlaceholder) {
return EMPTY_GIF
}
return this.$img(this.src, {
provider: this.provider,
preset: this.preset,
modifiers: this.nModifiers
}).url
},
nAttrs () {
const attrs: any = {}
if (this.responsive) {
const { sizes, srcSet } = this.getResponsive()
attrs.sizes = sizes
attrs.srcSet = srcSet
}
return attrs
},
nModifiers () {
return {
...this.modifiers,
width: this.width,
height: this.height,
format: this.format,
quality: this.quality,
background: this.background,
fit: this.fit
}
}
},
created () {
if (process.server && process.static) {
// Force compute sources into ssrContext
this.getResponsive()
}
},
mounted () {
if (this.usePlaceholder) {
this.observe()
}
},
beforeDestroy () {
this.unobserve()
},
methods: {
getResponsive () {
const sizes = this.$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
})
},
unobserve () {
if (this._removeObserver) {
this._removeObserver()
delete this._removeObserver
}
}
}
}
</script>