gentelella-rtl
Version:
Gentelella RTL Admin is a free to use Bootstrap admin template
262 lines (221 loc) • 6.82 kB
JavaScript
const map = (typeof Map === "function") ? new Map() : (function () {
const keys = [];
const values = [];
return {
has(key) {
return keys.indexOf(key) > -1;
},
get(key) {
return values[keys.indexOf(key)];
},
set(key, value) {
if (keys.indexOf(key) === -1) {
keys.push(key);
values.push(value);
}
},
delete(key) {
const index = keys.indexOf(key);
if (index > -1) {
keys.splice(index, 1);
values.splice(index, 1);
}
},
}
})();
let createEvent = (name)=> new Event(name, {bubbles: true});
try {
new Event('test');
} catch(e) {
// IE does not support `new Event()`
createEvent = (name)=> {
const evt = document.createEvent('Event');
evt.initEvent(name, true, false);
return evt;
};
}
function assign(ta) {
if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || map.has(ta)) return;
let heightOffset = null;
let clientWidth = ta.clientWidth;
let cachedHeight = null;
function init() {
const style = window.getComputedStyle(ta, null);
if (style.resize === 'vertical') {
ta.style.resize = 'none';
} else if (style.resize === 'both') {
ta.style.resize = 'horizontal';
}
if (style.boxSizing === 'content-box') {
heightOffset = -(parseFloat(style.paddingTop)+parseFloat(style.paddingBottom));
} else {
heightOffset = parseFloat(style.borderTopWidth)+parseFloat(style.borderBottomWidth);
}
// Fix when a textarea is not on document body and heightOffset is Not a Number
if (isNaN(heightOffset)) {
heightOffset = 0;
}
update();
}
function changeOverflow(value) {
{
// Chrome/Safari-specific fix:
// When the textarea y-overflow is hidden, Chrome/Safari do not reflow the text to account for the space
// made available by removing the scrollbar. The following forces the necessary text reflow.
const width = ta.style.width;
ta.style.width = '0px';
// Force reflow:
/* jshint ignore:start */
ta.offsetWidth;
/* jshint ignore:end */
ta.style.width = width;
}
ta.style.overflowY = value;
}
function getParentOverflows(el) {
const arr = [];
while (el && el.parentNode && el.parentNode instanceof Element) {
if (el.parentNode.scrollTop) {
arr.push({
node: el.parentNode,
scrollTop: el.parentNode.scrollTop,
})
}
el = el.parentNode;
}
return arr;
}
function resize() {
const originalHeight = ta.style.height;
const overflows = getParentOverflows(ta);
const docTop = document.documentElement && document.documentElement.scrollTop; // Needed for Mobile IE (ticket #240)
ta.style.height = 'auto';
let endHeight = ta.scrollHeight+heightOffset;
if (ta.scrollHeight === 0) {
// If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
ta.style.height = originalHeight;
return;
}
ta.style.height = endHeight+'px';
// used to check if an update is actually necessary on window.resize
clientWidth = ta.clientWidth;
// prevents scroll-position jumping
overflows.forEach(el => {
el.node.scrollTop = el.scrollTop
});
if (docTop) {
document.documentElement.scrollTop = docTop;
}
}
function update() {
resize();
const styleHeight = Math.round(parseFloat(ta.style.height));
const computed = window.getComputedStyle(ta, null);
// Using offsetHeight as a replacement for computed.height in IE, because IE does not account use of border-box
var actualHeight = computed.boxSizing === 'content-box' ? Math.round(parseFloat(computed.height)) : ta.offsetHeight;
// The actual height not matching the style height (set via the resize method) indicates that
// the max-height has been exceeded, in which case the overflow should be allowed.
if (actualHeight !== styleHeight) {
if (computed.overflowY === 'hidden') {
changeOverflow('scroll');
resize();
actualHeight = computed.boxSizing === 'content-box' ? Math.round(parseFloat(window.getComputedStyle(ta, null).height)) : ta.offsetHeight;
}
} else {
// Normally keep overflow set to hidden, to avoid flash of scrollbar as the textarea expands.
if (computed.overflowY !== 'hidden') {
changeOverflow('hidden');
resize();
actualHeight = computed.boxSizing === 'content-box' ? Math.round(parseFloat(window.getComputedStyle(ta, null).height)) : ta.offsetHeight;
}
}
if (cachedHeight !== actualHeight) {
cachedHeight = actualHeight;
const evt = createEvent('autosize:resized');
try {
ta.dispatchEvent(evt);
} catch (err) {
// Firefox will throw an error on dispatchEvent for a detached element
// https://bugzilla.mozilla.org/show_bug.cgi?id=889376
}
}
}
const pageResize = () => {
if (ta.clientWidth !== clientWidth) {
update();
}
};
const destroy = style => {
window.removeEventListener('resize', pageResize, false);
ta.removeEventListener('input', update, false);
ta.removeEventListener('keyup', update, false);
ta.removeEventListener('autosize:destroy', destroy, false);
ta.removeEventListener('autosize:update', update, false);
Object.keys(style).forEach(key => {
ta.style[key] = style[key];
});
map.delete(ta);
}.bind(ta, {
height: ta.style.height,
resize: ta.style.resize,
overflowY: ta.style.overflowY,
overflowX: ta.style.overflowX,
wordWrap: ta.style.wordWrap,
});
ta.addEventListener('autosize:destroy', destroy, false);
// IE9 does not fire onpropertychange or oninput for deletions,
// so binding to onkeyup to catch most of those events.
// There is no way that I know of to detect something like 'cut' in IE9.
if ('onpropertychange' in ta && 'oninput' in ta) {
ta.addEventListener('keyup', update, false);
}
window.addEventListener('resize', pageResize, false);
ta.addEventListener('input', update, false);
ta.addEventListener('autosize:update', update, false);
ta.style.overflowX = 'hidden';
ta.style.wordWrap = 'break-word';
map.set(ta, {
destroy,
update,
});
init();
}
function destroy(ta) {
const methods = map.get(ta);
if (methods) {
methods.destroy();
}
}
function update(ta) {
const methods = map.get(ta);
if (methods) {
methods.update();
}
}
let autosize = null;
// Do nothing in Node.js environment and IE8 (or lower)
if (typeof window === 'undefined' || typeof window.getComputedStyle !== 'function') {
autosize = el => el;
autosize.destroy = el => el;
autosize.update = el => el;
} else {
autosize = (el, options) => {
if (el) {
Array.prototype.forEach.call(el.length ? el : [el], x => assign(x, options));
}
return el;
};
autosize.destroy = el => {
if (el) {
Array.prototype.forEach.call(el.length ? el : [el], destroy);
}
return el;
};
autosize.update = el => {
if (el) {
Array.prototype.forEach.call(el.length ? el : [el], update);
}
return el;
};
}
export default autosize;