Method parseHeight

src/utils.ts:388–405

* Parse a height value with units into numeric value and unit string. * Supports px, em, rem, vh, vw, %, cm, mm units. * * @param val height value as number or string with units * @returns object with h (height) and unit properties * * @example * Utils.parseHeight('100px'); //

(val: numberOrString)

   * Utils.parseHeight(50);       // {h: 50, unit: 'px'}
   */
  static parseHeight(val: numberOrString): HeightData {
    let h: number;
    let unit = 'px';
    if (typeof val === 'string') {
      if (val === 'auto' || val === '') h = 0;
      else {
        const match = val.match(/^(-[0-9]+\.[0-9]+|[0-9]*\.[0-9]+|-[0-9]+|[0-9]+)(px|em|rem|vh|vw|%|cm|mm)?$/);
        if (!match) {
          throw new Error(`Invalid height val = ${val}`);
        }
        unit = match[2] || 'px';
        h = parseFloat(match[1]);
      }
    } else {
      h = val;
    }
    return { h, unit };
  }

  /**
   * Copy unset fields from source objects to target object (shallow merge with defaults).