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tanthammar/always-on-top.js

Created May 14, 2021 17:31
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JS Get highest z-index, always on top
Raw
always-on-top.js
window.findHighestZ = () => [...document.querySelectorAll('body *')]
.map(elt => parseFloat(getComputedStyle(elt).zIndex))
.reduce((z, highest=Number.MIN_SAFE_INTEGER) =>
isNaN(z) || z < highest ? (isNaN(highest) ? 1 : highest) : z
)
//vanilla
document.getElementById("foo").style.zIndex = window.findHighestZ()
//alpine
this.$refs.foo.style.zIndex = window.findHighestZ()
@tanthammar
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Recommend to add style="isolation: isolate" to the outmost container. (TailwindCSS class="isolate")
https://www.joshwcomeau.com/css/stacking-contexts/#creating-stacking-contexts

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