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Prevent scroll jitter on input #97

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Prevent scroll jitter on input #97

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14 changes: 14 additions & 0 deletions src/textarea-autosize.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,15 @@ class TextareaAutoSize {
}

update() {
// Find nearest scrollable ancestor
let box = this.element.parentElement

while (box && !/auto|scroll/.test(getComputedStyle(box).overflowY)) {
box = box.parentElement
}

const prevScroll = box?.scrollTop ?? 0

const smallestHeight = this._styleProp("fontSize")
this.element.style.height = `${smallestHeight}px`

Expand All @@ -28,6 +37,11 @@ class TextareaAutoSize {
// do the same regardless of whether this value is added or not.
const newHeight = this.element.scrollHeight + this.verticalBorderSize
this.element.style.height = `${newHeight}px`

// Restore scroll to prevent jumping
if (box) {
box.scrollTop = prevScroll
}
}

_styleProp(name) {
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