calcTextareaHeight.js
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// Thanks to
// https://github.com/andreypopp/react-textarea-autosize/
// let hiddenTextarea;
//
// const HIDDEN_STYLE = `
// height:0 !important;
// min-height:0 !important;
// max-height:none !important;
// visibility:hidden !important;
// overflow:hidden !important;
// position:absolute !important;
// z-index:-1000 !important;
// top:0 !important;
// right:0 !important
// `;
//
// const CONTEXT_STYLE = [
// 'letter-spacing',
// 'line-height',
// 'padding-top',
// 'padding-bottom',
// 'font-family',
// 'font-weight',
// 'font-size',
// 'text-rendering',
// 'text-transform',
// 'width',
// 'text-indent',
// 'padding-left',
// 'padding-right',
// 'border-width',
// 'box-sizing'
// ];
//
// function calculateNodeStyling(node) {
// const style = window.getComputedStyle(node);
//
// const boxSizing = style.getPropertyValue('box-sizing');
//
// const paddingSize = (
// parseFloat(style.getPropertyValue('padding-bottom')) +
// parseFloat(style.getPropertyValue('padding-top'))
// );
//
// const borderSize = (
// parseFloat(style.getPropertyValue('border-bottom-width')) +
// parseFloat(style.getPropertyValue('border-top-width'))
// );
//
// const contextStyle = CONTEXT_STYLE
// .map(name => `${name}:${style.getPropertyValue(name)}`)
// .join(';');
//
// return {contextStyle, paddingSize, borderSize, boxSizing};
// }
//
// export default function calcTextareaHeight(targetNode, minRows = null, maxRows = null) {
// if (!hiddenTextarea) {
// hiddenTextarea = document.createElement('textarea');
// document.body.appendChild(hiddenTextarea);
// }
//
// let {
// paddingSize,
// borderSize,
// boxSizing,
// contextStyle
// } = calculateNodeStyling(targetNode);
//
// hiddenTextarea.setAttribute('style', `${contextStyle};${HIDDEN_STYLE}`);
// hiddenTextarea.value = targetNode.value || targetNode.placeholder || '';
//
// let height = hiddenTextarea.scrollHeight;
// let minHeight = -Infinity;
// let maxHeight = Infinity;
// let overflowY;
//
// if (boxSizing === 'border-box') {
// height = height + borderSize;
// } else if (boxSizing === 'content-box') {
// height = height - paddingSize;
// }
//
// hiddenTextarea.value = '';
// let singleRowHeight = hiddenTextarea.scrollHeight - paddingSize;
//
// if (minRows !== null) {
// minHeight = singleRowHeight * minRows;
// if (boxSizing === 'border-box') {
// minHeight = minHeight + paddingSize + borderSize;
// }
// height = Math.max(minHeight, height);
// }
// if (maxRows !== null) {
// maxHeight = singleRowHeight * maxRows;
// if (boxSizing === 'border-box') {
// maxHeight = maxHeight + paddingSize + borderSize;
// }
// overflowY = height > maxHeight ? '' : 'hidden';
// height = Math.min(maxHeight, height);
// }
//
// if (!maxRows) {
// overflowY = 'hidden';
// }
//
// return {
// height: `${height}px`,
// minHeight: `${minHeight}px`,
// maxHeight: `${maxHeight}px`,
// overflowY
// };
// }
const HIDDEN_TEXTAREA_STYLE = `
min-height:0 !important;
max-height:none !important;
height:0 !important;
visibility:hidden !important;
overflow:hidden !important;
position:absolute !important;
z-index:-1000 !important;
top:0 !important;
right:0 !important
`;
const SIZING_STYLE = [
'letter-spacing',
'line-height',
'padding-top',
'padding-bottom',
'font-family',
'font-weight',
'font-size',
'text-rendering',
'text-transform',
'width',
'text-indent',
'padding-left',
'padding-right',
'border-width',
'box-sizing',
];
let computedStyleCache = {};
let hiddenTextarea;
function calculateNodeStyling(node, useCache = false) {
const nodeRef = (
node.getAttribute('id') ||
node.getAttribute('data-reactid') ||
node.getAttribute('name'));
if (useCache && computedStyleCache[nodeRef]) {
return computedStyleCache[nodeRef];
}
const style = window.getComputedStyle(node);
const boxSizing = (
style.getPropertyValue('box-sizing') ||
style.getPropertyValue('-moz-box-sizing') ||
style.getPropertyValue('-webkit-box-sizing')
);
const paddingSize = (
parseFloat(style.getPropertyValue('padding-bottom')) +
parseFloat(style.getPropertyValue('padding-top'))
);
const borderSize = (
parseFloat(style.getPropertyValue('border-bottom-width')) +
parseFloat(style.getPropertyValue('border-top-width'))
);
const sizingStyle = SIZING_STYLE
.map(name => `${name}:${style.getPropertyValue(name)}`)
.join(';');
const nodeInfo = {
sizingStyle,
paddingSize,
borderSize,
boxSizing,
};
if (useCache && nodeRef) {
computedStyleCache[nodeRef] = nodeInfo;
}
return nodeInfo;
}
export default function calcTextareaHeight(uiTextNode, minRows = null, maxRows = null, useCache = false) {
if (!hiddenTextarea) {
hiddenTextarea = document.createElement('textarea');
document.body.appendChild(hiddenTextarea);
}
// Fix wrap="off" issue
// https://github.com/ant-design/ant-design/issues/6577
if (uiTextNode.getAttribute('wrap')) {
hiddenTextarea.setAttribute('wrap', uiTextNode.getAttribute('wrap'));
} else {
hiddenTextarea.removeAttribute('wrap');
}
// Copy all CSS properties that have an impact on the height of the content in
// the textbox
let {
paddingSize, borderSize,
boxSizing, sizingStyle,
} = calculateNodeStyling(uiTextNode, useCache);
// Need to have the overflow attribute to hide the scrollbar otherwise
// text-lines will not calculated properly as the shadow will technically be
// narrower for content
hiddenTextarea.setAttribute('style', `${sizingStyle};${HIDDEN_TEXTAREA_STYLE}`);
hiddenTextarea.value = uiTextNode.value || uiTextNode.placeholder || '';
let minHeight = Number.MIN_SAFE_INTEGER;
let maxHeight = Number.MAX_SAFE_INTEGER;
let height = hiddenTextarea.scrollHeight;
let overflowY;
if (boxSizing === 'border-box') {
// border-box: add border, since height = content + padding + border
height = height + borderSize;
} else if (boxSizing === 'content-box') {
// remove padding, since height = content
height = height - paddingSize;
}
if (minRows !== null || maxRows !== null) {
// measure height of a textarea with a single row
hiddenTextarea.value = ' ';
let singleRowHeight = hiddenTextarea.scrollHeight - paddingSize;
if (minRows !== null) {
minHeight = singleRowHeight * minRows;
if (boxSizing === 'border-box') {
minHeight = minHeight + paddingSize + borderSize;
}
height = Math.max(minHeight, height);
}
if (maxRows !== null) {
maxHeight = singleRowHeight * maxRows;
if (boxSizing === 'border-box') {
maxHeight = maxHeight + paddingSize + borderSize;
}
overflowY = height > maxHeight ? '' : 'hidden';
height = Math.min(maxHeight, height);
}
}
// Remove scroll bar flash when autosize without maxRows
if (!maxRows) {
overflowY = 'hidden';
}
return {
height: `${height}px`,
minHeight: `${minHeight}px`,
maxHeight: `${maxHeight}px`,
overflowY
};
}