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Leverage rows to update height, not style's height value #605

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Leverage rows to update height, not style's height value #605

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13 changes: 10 additions & 3 deletions shiny/experimental/www/textarea-autoresize.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,15 @@

onDelegatedEvent("input", "textarea.textarea-autoresize", (e) => {
const { target } = e;
// Automatically resize the textarea to fit its content.
target.style.height = "auto";
target.style.height = target.scrollHeight + "px";

// Removed lines!
// This may remove 1 too many lines. (Which will be added back in the next loop)
while (target.rows > 1 && target.scrollHeight === target.clientHeight) {
target.rows -= 1;
}
// Added lines!
while (target.scrollHeight > target.clientHeight) {
target.rows += 1;
}
});
})();