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228 lines
8 KiB
JavaScript
228 lines
8 KiB
JavaScript
import {debounce} from 'throttle-debounce';
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function elementsCall(el, func, ...args) {
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if (typeof el === 'string' || el instanceof String) {
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el = document.querySelectorAll(el);
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}
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if (el instanceof Node) {
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func(el, ...args);
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} else if (el.length !== undefined) {
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// this works for: NodeList, HTMLCollection, Array, jQuery
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for (const e of el) {
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func(e, ...args);
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}
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} else {
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throw new Error('invalid argument to be shown/hidden');
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}
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}
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/**
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* @param el string (selector), Node, NodeList, HTMLCollection, Array or jQuery
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* @param force force=true to show or force=false to hide, undefined to toggle
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*/
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function toggleShown(el, force) {
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if (force === true) {
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el.classList.remove('gt-hidden');
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} else if (force === false) {
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el.classList.add('gt-hidden');
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} else if (force === undefined) {
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el.classList.toggle('gt-hidden');
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} else {
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throw new Error('invalid force argument');
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}
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}
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export function showElem(el) {
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elementsCall(el, toggleShown, true);
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}
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export function hideElem(el) {
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elementsCall(el, toggleShown, false);
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}
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export function toggleElem(el, force) {
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elementsCall(el, toggleShown, force);
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}
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export function isElemHidden(el) {
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const res = [];
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elementsCall(el, (e) => res.push(e.classList.contains('gt-hidden')));
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if (res.length > 1) throw new Error(`isElemHidden doesn't work for multiple elements`);
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return res[0];
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}
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export function onDomReady(cb) {
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if (document.readyState === 'loading') {
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document.addEventListener('DOMContentLoaded', cb);
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} else {
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cb();
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}
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}
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// checks whether an element is owned by the current document, and whether it is a document fragment or element node
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// if it is, it means it is a "normal" element managed by us, which can be modified safely.
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export function isDocumentFragmentOrElementNode(el) {
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try {
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return el.ownerDocument === document && el.nodeType === Node.ELEMENT_NODE || el.nodeType === Node.DOCUMENT_FRAGMENT_NODE;
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} catch {
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// in case the el is not in the same origin, then the access to nodeType would fail
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return false;
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}
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}
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// autosize a textarea to fit content. Based on
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// https://github.com/github/textarea-autosize
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// ---------------------------------------------------------------------
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// Copyright (c) 2018 GitHub, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// ---------------------------------------------------------------------
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export function autosize(textarea, {viewportMarginBottom = 0} = {}) {
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let isUserResized = false;
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// lastStyleHeight and initialStyleHeight are CSS values like '100px'
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let lastMouseX, lastMouseY, lastStyleHeight, initialStyleHeight;
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function onUserResize(event) {
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if (isUserResized) return;
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if (lastMouseX !== event.clientX || lastMouseY !== event.clientY) {
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const newStyleHeight = textarea.style.height;
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if (lastStyleHeight && lastStyleHeight !== newStyleHeight) {
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isUserResized = true;
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}
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lastStyleHeight = newStyleHeight;
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}
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lastMouseX = event.clientX;
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lastMouseY = event.clientY;
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}
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function overflowOffset() {
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let offsetTop = 0;
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let el = textarea;
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while (el !== document.body && el !== null) {
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offsetTop += el.offsetTop || 0;
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el = el.offsetParent;
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}
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const top = offsetTop - document.defaultView.scrollY;
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const bottom = document.documentElement.clientHeight - (top + textarea.offsetHeight);
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return {top, bottom};
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}
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function resizeToFit() {
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if (isUserResized) return;
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if (textarea.offsetWidth <= 0 && textarea.offsetHeight <= 0) return;
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try {
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const {top, bottom} = overflowOffset();
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const isOutOfViewport = top < 0 || bottom < 0;
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const computedStyle = getComputedStyle(textarea);
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const topBorderWidth = parseFloat(computedStyle.borderTopWidth);
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const bottomBorderWidth = parseFloat(computedStyle.borderBottomWidth);
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const isBorderBox = computedStyle.boxSizing === 'border-box';
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const borderAddOn = isBorderBox ? topBorderWidth + bottomBorderWidth : 0;
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const adjustedViewportMarginBottom = bottom < viewportMarginBottom ? bottom : viewportMarginBottom;
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const curHeight = parseFloat(computedStyle.height);
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const maxHeight = curHeight + bottom - adjustedViewportMarginBottom;
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textarea.style.height = 'auto';
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let newHeight = textarea.scrollHeight + borderAddOn;
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if (isOutOfViewport) {
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// it is already out of the viewport:
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// * if the textarea is expanding: do not resize it
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if (newHeight > curHeight) {
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newHeight = curHeight;
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}
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// * if the textarea is shrinking, shrink line by line (just use the
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// scrollHeight). do not apply max-height limit, otherwise the page
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// flickers and the textarea jumps
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} else {
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// * if it is in the viewport, apply the max-height limit
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newHeight = Math.min(maxHeight, newHeight);
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}
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textarea.style.height = `${newHeight}px`;
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lastStyleHeight = textarea.style.height;
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} finally {
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// ensure that the textarea is fully scrolled to the end, when the cursor
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// is at the end during an input event
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if (textarea.selectionStart === textarea.selectionEnd &&
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textarea.selectionStart === textarea.value.length) {
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textarea.scrollTop = textarea.scrollHeight;
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}
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}
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}
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function onFormReset() {
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isUserResized = false;
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if (initialStyleHeight !== undefined) {
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textarea.style.height = initialStyleHeight;
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} else {
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textarea.style.removeProperty('height');
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}
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}
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textarea.addEventListener('mousemove', onUserResize);
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textarea.addEventListener('input', resizeToFit);
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textarea.form?.addEventListener('reset', onFormReset);
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initialStyleHeight = textarea.style.height ?? undefined;
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if (textarea.value) resizeToFit();
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return {
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resizeToFit,
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destroy() {
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textarea.removeEventListener('mousemove', onUserResize);
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textarea.removeEventListener('input', resizeToFit);
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textarea.form?.removeEventListener('reset', onFormReset);
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}
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};
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}
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export function onInputDebounce(fn) {
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return debounce(300, fn);
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}
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// Set the `src` attribute on an element and returns a promise that resolves once the element
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// has loaded or errored. Suitable for all elements mention in:
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// https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/load_event
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export function loadElem(el, src) {
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return new Promise((resolve) => {
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el.addEventListener('load', () => resolve(true), {once: true});
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el.addEventListener('error', () => resolve(false), {once: true});
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el.src = src;
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});
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}
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// some browsers like PaleMoon don't have "SubmitEvent" support, so polyfill it by a tricky method: use the last clicked button as submitter
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// it can't use other transparent polyfill patches because PaleMoon also doesn't support "addEventListener(capture)"
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const needSubmitEventPolyfill = typeof SubmitEvent === 'undefined';
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export function submitEventSubmitter(e) {
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return needSubmitEventPolyfill ? (e.target._submitter || null) : e.submitter;
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}
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function submitEventPolyfillListener(e) {
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const form = e.target.closest('form');
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if (!form) return;
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form._submitter = e.target.closest('button:not([type]), button[type="submit"], input[type="submit"]');
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}
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export function initSubmitEventPolyfill() {
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if (!needSubmitEventPolyfill) return;
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console.warn(`This browser doesn't have "SubmitEvent" support, use a tricky method to polyfill`);
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document.body.addEventListener('click', submitEventPolyfillListener);
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document.body.addEventListener('focus', submitEventPolyfillListener);
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}
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