mirror of
https://github.com/codeninjasllc/discourse.git
synced 2024-12-11 16:21:24 -05:00
200 lines
4.9 KiB
JavaScript
200 lines
4.9 KiB
JavaScript
const set = (typeof Set === "function") ? new Set() : (function () {
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const list = [];
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return {
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has(key) {
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return Boolean(list.indexOf(key) > -1);
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},
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add(key) {
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list.push(key);
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},
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delete(key) {
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list.splice(list.indexOf(key), 1);
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},
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};
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})();
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function assign(ta, {setOverflowX = true, setOverflowY = true} = {}) {
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if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || set.has(ta)) return;
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let heightOffset = null;
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let overflowY = null;
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let clientWidth = ta.clientWidth;
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function init() {
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const style = window.getComputedStyle(ta, null);
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overflowY = style.overflowY;
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if (style.resize === 'vertical') {
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ta.style.resize = 'none';
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} else if (style.resize === 'both') {
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ta.style.resize = 'horizontal';
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}
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if (style.boxSizing === 'content-box') {
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heightOffset = -(parseFloat(style.paddingTop)+parseFloat(style.paddingBottom));
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} else {
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heightOffset = parseFloat(style.borderTopWidth)+parseFloat(style.borderBottomWidth);
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}
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// Fix when a textarea is not on document body and heightOffset is Not a Number
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if (isNaN(heightOffset)) {
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heightOffset = 0;
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}
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update();
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}
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function changeOverflow(value) {
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{
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// Chrome/Safari-specific fix:
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// When the textarea y-overflow is hidden, Chrome/Safari do not reflow the text to account for the space
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// made available by removing the scrollbar. The following forces the necessary text reflow.
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const width = ta.style.width;
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ta.style.width = '0px';
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// Force reflow:
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/* jshint ignore:start */
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ta.offsetWidth;
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/* jshint ignore:end */
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ta.style.width = width;
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}
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overflowY = value;
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if (setOverflowY) {
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ta.style.overflowY = value;
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}
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resize();
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}
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function resize() {
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const htmlTop = window.pageYOffset;
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const bodyTop = document.body.scrollTop;
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const originalHeight = ta.style.height;
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ta.style.height = 'auto';
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let endHeight = ta.scrollHeight+heightOffset;
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if (ta.scrollHeight === 0) {
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// If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
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ta.style.height = originalHeight;
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return;
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}
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ta.style.height = endHeight+'px';
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// used to check if an update is actually necessary on window.resize
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clientWidth = ta.clientWidth;
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// prevents scroll-position jumping
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document.documentElement.scrollTop = htmlTop;
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document.body.scrollTop = bodyTop;
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}
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function update() {
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const startHeight = ta.style.height;
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resize();
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const style = window.getComputedStyle(ta, null);
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if (style.height !== ta.style.height) {
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if (overflowY !== 'visible') {
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changeOverflow('visible');
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}
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} else {
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if (overflowY !== 'hidden') {
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changeOverflow('hidden');
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}
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}
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if (startHeight !== ta.style.height) {
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const evt = document.createEvent('Event');
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evt.initEvent('autosize:resized', true, false);
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ta.dispatchEvent(evt);
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}
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}
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const pageResize = () => {
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if (ta.clientWidth !== clientWidth) {
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update();
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}
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};
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const destroy = style => {
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window.removeEventListener('resize', pageResize, false);
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ta.removeEventListener('input', update, false);
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ta.removeEventListener('keyup', update, false);
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ta.removeEventListener('autosize:destroy', destroy, false);
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ta.removeEventListener('autosize:update', update, false);
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set.delete(ta);
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Object.keys(style).forEach(key => {
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ta.style[key] = style[key];
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});
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}.bind(ta, {
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height: ta.style.height,
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resize: ta.style.resize,
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overflowY: ta.style.overflowY,
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overflowX: ta.style.overflowX,
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wordWrap: ta.style.wordWrap,
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});
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ta.addEventListener('autosize:destroy', destroy, false);
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// IE9 does not fire onpropertychange or oninput for deletions,
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// so binding to onkeyup to catch most of those events.
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// There is no way that I know of to detect something like 'cut' in IE9.
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if ('onpropertychange' in ta && 'oninput' in ta) {
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ta.addEventListener('keyup', update, false);
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}
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window.addEventListener('resize', pageResize, false);
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ta.addEventListener('input', update, false);
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ta.addEventListener('autosize:update', update, false);
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set.add(ta);
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if (setOverflowX) {
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ta.style.overflowX = 'hidden';
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ta.style.wordWrap = 'break-word';
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}
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init();
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}
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function exportDestroy(ta) {
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if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
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const evt = document.createEvent('Event');
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evt.initEvent('autosize:destroy', true, false);
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ta.dispatchEvent(evt);
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}
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function exportUpdate(ta) {
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if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
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const evt = document.createEvent('Event');
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evt.initEvent('autosize:update', true, false);
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ta.dispatchEvent(evt);
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}
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let autosize = (el, options) => {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], x => assign(x, options));
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}
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return el;
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};
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autosize.destroy = el => {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], exportDestroy);
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}
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return el;
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};
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autosize.update = el => {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], exportUpdate);
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}
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return el;
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};
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export default autosize;
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