239 Auto-expand message area when typing
adambar
10 years ago
parent
1696898112
commit
07ac0ae9cc
@ -0,0 +1,211 @@
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/*!
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Autosize 3.0.5
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license: MIT
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http://www.jacklmoore.com/autosize
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*/
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(function (global, factory) {
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if (typeof define === 'function' && define.amd) {
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define(['exports', 'module'], factory);
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} else if (typeof exports !== 'undefined' && typeof module !== 'undefined') {
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factory(exports, module);
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} else {
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var mod = {
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exports: {}
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};
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factory(mod.exports, mod);
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global.autosize = mod.exports;
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}
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})(this, function (exports, module) {
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'use strict';
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function assign(ta) {
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var _ref = arguments[1] === undefined ? {} : arguments[1];
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var _ref$setOverflowX = _ref.setOverflowX;
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var setOverflowX = _ref$setOverflowX === undefined ? true : _ref$setOverflowX;
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var _ref$setOverflowY = _ref.setOverflowY;
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var setOverflowY = _ref$setOverflowY === undefined ? true : _ref$setOverflowY;
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if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || ta.hasAttribute('data-autosize-on')) return;
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var heightOffset = null;
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var overflowY = 'hidden';
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function init() {
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var style = window.getComputedStyle(ta, null);
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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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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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var 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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update();
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}
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function update() {
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var startHeight = ta.style.height;
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var htmlTop = document.documentElement.scrollTop;
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var bodyTop = document.body.scrollTop;
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var originalHeight = ta.style.height;
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ta.style.height = 'auto';
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var 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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// prevents scroll-position jumping
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document.documentElement.scrollTop = htmlTop;
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document.body.scrollTop = bodyTop;
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var 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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return;
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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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return;
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}
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}
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if (startHeight !== ta.style.height) {
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var 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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var destroy = (function (style) {
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window.removeEventListener('resize', update);
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ta.removeEventListener('input', update);
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ta.removeEventListener('keyup', update);
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ta.removeAttribute('data-autosize-on');
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ta.removeEventListener('autosize:destroy', destroy);
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Object.keys(style).forEach(function (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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ta.addEventListener('autosize:destroy', destroy);
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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);
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}
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window.addEventListener('resize', update);
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ta.addEventListener('input', update);
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ta.addEventListener('autosize:update', update);
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ta.setAttribute('data-autosize-on', true);
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if (setOverflowY) {
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ta.style.overflowY = 'hidden';
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}
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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 destroy(ta) {
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if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
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var 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 update(ta) {
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if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
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var 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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var autosize = null;
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// Do nothing in Node.js environment and IE8 (or lower)
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if (typeof window === 'undefined' || typeof window.getComputedStyle !== 'function') {
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autosize = function (el) {
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return el;
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};
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autosize.destroy = function (el) {
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return el;
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};
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autosize.update = function (el) {
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return el;
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};
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} else {
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autosize = function (el, options) {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], function (x) {
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return assign(x, options);
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});
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}
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return el;
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};
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autosize.destroy = function (el) {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], destroy);
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}
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return el;
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};
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autosize.update = function (el) {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], update);
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}
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return el;
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};
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}
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module.exports = autosize;
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});
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