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<script lang="ts">
import { onDestroy, onMount } from 'svelte'
import { browser } from '$app/env'
export let url: string
let styleHtml = `<style class="background-image-style">:root{--background:url(${url})}</style>`
let serverSideRenderedStyleShown = true
function updateUrl() {
if (!browser) return
for (const styleEl of document.getElementsByClassName('background-image-style'))
styleEl.innerHTML = ''
// add bodyStyle to the head
const style = document.createElement('style')
style.classList.add('background-image-style')
style.innerHTML = `:root{--background:url(${url})}`
document.head.appendChild(style)
}
$: [url, updateUrl()]
onMount(() => {
serverSideRenderedStyleShown = false
})
// get rid of the body style when we leave the page
// not doing this will sometimes cause the background to stay
onDestroy(() => {
if (browser) {
for (const styleEl of document.getElementsByClassName('background-image-style'))
styleEl.innerHTML = ''
}
})
</script>
<svelte:head>
{#if serverSideRenderedStyleShown}
{@html styleHtml}
{/if}
</svelte:head>
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