import {debounce} from 'throttle-debounce'; function elementsCall(el, func, ...args) { if (typeof el === 'string' || el instanceof String) { el = document.querySelectorAll(el); } if (el instanceof Node) { func(el, ...args); } else if (el.length !== undefined) { // this works for: NodeList, HTMLCollection, Array, jQuery for (const e of el) { func(e, ...args); } } else { throw new Error('invalid argument to be shown/hidden'); } } /** * @param el string (selector), Node, NodeList, HTMLCollection, Array or jQuery * @param force force=true to show or force=false to hide, undefined to toggle */ function toggleShown(el, force) { if (force === true) { el.classList.remove('gt-hidden'); } else if (force === false) { el.classList.add('gt-hidden'); } else if (force === undefined) { el.classList.toggle('gt-hidden'); } else { throw new Error('invalid force argument'); } } export function showElem(el) { elementsCall(el, toggleShown, true); } export function hideElem(el) { elementsCall(el, toggleShown, false); } export function toggleElem(el, force) { elementsCall(el, toggleShown, force); } export function isElemHidden(el) { const res = []; elementsCall(el, (e) => res.push(e.classList.contains('gt-hidden'))); if (res.length > 1) throw new Error(`isElemHidden doesn't work for multiple elements`); return res[0]; } export function onDomReady(cb) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', cb); } else { cb(); } } // autosize a textarea to fit content. Based on // https://github.com/github/textarea-autosize // --------------------------------------------------------------------- // Copyright (c) 2018 GitHub, Inc. // // Permission is hereby granted, free of charge, to any person obtaining // a copy of this software and associated documentation files (the // "Software"), to deal in the Software without restriction, including // without limitation the rights to use, copy, modify, merge, publish, // distribute, sublicense, and/or sell copies of the Software, and to // permit persons to whom the Software is furnished to do so, subject to // the following conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // --------------------------------------------------------------------- export function autosize(textarea, {viewportMarginBottom = 0} = {}) { let isUserResized = false; // lastStyleHeight and initialStyleHeight are CSS values like '100px' let lastMouseX, lastMouseY, lastStyleHeight, initialStyleHeight; function onUserResize(event) { if (isUserResized) return; if (lastMouseX !== event.clientX || lastMouseY !== event.clientY) { const newStyleHeight = textarea.style.height; if (lastStyleHeight && lastStyleHeight !== newStyleHeight) { isUserResized = true; } lastStyleHeight = newStyleHeight; } lastMouseX = event.clientX; lastMouseY = event.clientY; } function overflowOffset() { let offsetTop = 0; let el = textarea; while (el !== document.body && el !== null) { offsetTop += el.offsetTop || 0; el = el.offsetParent; } const top = offsetTop - document.defaultView.scrollY; const bottom = document.documentElement.clientHeight - (top + textarea.offsetHeight); return {top, bottom}; } function resizeToFit() { if (isUserResized) return; if (textarea.offsetWidth <= 0 && textarea.offsetHeight <= 0) return; try { const {top, bottom} = overflowOffset(); const isOutOfViewport = top < 0 || bottom < 0; const computedStyle = getComputedStyle(textarea); const topBorderWidth = parseFloat(computedStyle.borderTopWidth); const bottomBorderWidth = parseFloat(computedStyle.borderBottomWidth); const isBorderBox = computedStyle.boxSizing === 'border-box'; const borderAddOn = isBorderBox ? topBorderWidth + bottomBorderWidth : 0; const adjustedViewportMarginBottom = bottom < viewportMarginBottom ? bottom : viewportMarginBottom; const curHeight = parseFloat(computedStyle.height); const maxHeight = curHeight + bottom - adjustedViewportMarginBottom; textarea.style.height = 'auto'; let newHeight = textarea.scrollHeight + borderAddOn; if (isOutOfViewport) { // it is already out of the viewport: // * if the textarea is expanding: do not resize it if (newHeight > curHeight) { newHeight = curHeight; } // * if the textarea is shrinking, shrink line by line (just use the // scrollHeight). do not apply max-height limit, otherwise the page // flickers and the textarea jumps } else { // * if it is in the viewport, apply the max-height limit newHeight = Math.min(maxHeight, newHeight); } textarea.style.height = `${newHeight}px`; lastStyleHeight = textarea.style.height; } finally { // ensure that the textarea is fully scrolled to the end, when the cursor // is at the end during an input event if (textarea.selectionStart === textarea.selectionEnd && textarea.selectionStart === textarea.value.length) { textarea.scrollTop = textarea.scrollHeight; } } } function onFormReset() { isUserResized = false; if (initialStyleHeight !== undefined) { textarea.style.height = initialStyleHeight; } else { textarea.style.removeProperty('height'); } } textarea.addEventListener('mousemove', onUserResize); textarea.addEventListener('input', resizeToFit); textarea.form?.addEventListener('reset', onFormReset); initialStyleHeight = textarea.style.height ?? undefined; if (textarea.value) resizeToFit(); return { resizeToFit, destroy() { textarea.removeEventListener('mousemove', onUserResize); textarea.removeEventListener('input', resizeToFit); textarea.form?.removeEventListener('reset', onFormReset); } }; } export function onInputDebounce(fn) { return debounce(300, fn); }