tdesign-mobile-vue/lib/_common/js/utils/calcTextareaHeight.js

tdesign-mobile-vue

/**
 * tdesign v1.15.1
 * (c) 2026 TDesign Group
 * @license MIT
 */

import { isNull } from 'lodash-es';
import { calculateNodeSize } from './helper.js';
import '@babel/runtime/helpers/toConsumableArray';
import '@babel/runtime/helpers/objectWithoutProperties';
import '@babel/runtime/helpers/slicedToArray';
import '@babel/runtime/helpers/defineProperty';

var TEXTAREA_STYLE = "\n  min-height:0 !important;\n  max-height:none !important;\n  height:0 !important;\n  visibility:hidden !important;\n  overflow:hidden !important;\n  position:absolute !important;\n  z-index:-1000 !important;\n  top:0 !important;\n  right:0 !important\n";
function calcTextareaHeight(targetElement) {
  var minRows = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
  var maxRows = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
  var hiddenTextarea = document.createElement("textarea");
  document.body.appendChild(hiddenTextarea);
  try {
    var _calculateNodeSize = calculateNodeSize(targetElement),
      paddingSize = _calculateNodeSize.paddingSize,
      borderSize = _calculateNodeSize.borderSize,
      boxSizing = _calculateNodeSize.boxSizing,
      sizingStyle = _calculateNodeSize.sizingStyle;
    hiddenTextarea.setAttribute("style", "".concat(sizingStyle, ";").concat(TEXTAREA_STYLE));
    hiddenTextarea.value = targetElement.value || targetElement.placeholder || "";
    var height = hiddenTextarea.scrollHeight;
    var result = {};
    var isBorderbox = boxSizing === "border-box";
    var isContentbox = boxSizing === "content-box";
    if (isBorderbox) {
      height += borderSize;
    } else if (isContentbox) {
      height -= paddingSize;
    }
    hiddenTextarea.value = "";
    var singleRowHeight = hiddenTextarea.scrollHeight - paddingSize;
    var calcHeight = function calcHeight(rows) {
      var rowsHeight = singleRowHeight * rows;
      if (isBorderbox) {
        rowsHeight = rowsHeight + paddingSize + borderSize;
      }
      return rowsHeight;
    };
    if (!isNull(minRows)) {
      var minHeight = calcHeight(minRows);
      height = Math.max(minHeight, height);
      result.minHeight = "".concat(minHeight, "px");
    }
    if (!isNull(maxRows)) {
      height = Math.min(calcHeight(maxRows), height);
    }
    result.height = "".concat(height, "px");
    return result;
  } finally {
    var _hiddenTextarea$paren;
    (_hiddenTextarea$paren = hiddenTextarea.parentNode) === null || _hiddenTextarea$paren === void 0 || _hiddenTextarea$paren.removeChild(hiddenTextarea);
  }
}

export { calcTextareaHeight as default };
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