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// Credits to https://codepen.io/tomhodgins/pen/KgazaE
(function () {
const classTag = 'frostAutoExpand';
const textareas = <NodeListOf<HTMLTextAreaElement>>document.querySelectorAll(`textarea:not(.${classTag})`);
const dataAttribute = 'data-frost-minHeight';
const _frostAutoExpand = (el: HTMLElement) => {
if (!el.hasAttribute(dataAttribute)) {
el.setAttribute(dataAttribute, el.offsetHeight.toString());
}
// If no height is defined, have min bound to current height;
// otherwise we will allow for height decreases in case user deletes text
const minHeight = parseInt(el.getAttribute(dataAttribute) ?? '0');
// Save scroll position prior to height update
// See https://stackoverflow.com/a/18262927/4407321
const scrollLeft = window.pageXOffset ||
(document.documentElement || document.body.parentNode || document.body).scrollLeft;
const scrollTop = window.pageYOffset ||
(document.documentElement || document.body.parentNode || document.body).scrollTop;
el.style.height = 'inherit';
el.style.height = `${Math.max(el.scrollHeight, minHeight)}px`;
// Go to original scroll position
window.scrollTo(scrollLeft, scrollTop);
};
function _frostExpandAll() {
textareas.forEach(_frostAutoExpand);
}
textareas.forEach(el => {
el.classList.add(classTag)
const __frostAutoExpand = () => {
_frostAutoExpand(el)
};
el.addEventListener('paste', __frostAutoExpand)
el.addEventListener('input', __frostAutoExpand)
el.addEventListener('keyup', __frostAutoExpand)
});
window.addEventListener('load', _frostExpandAll)
window.addEventListener('resize', _frostExpandAll)
}).call(undefined);
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