Drupal 8 - CKEditor height does not reflect the rows attribute(issue)

CKEditor is not following the changes made in the body rows setting for Drupal 8. The editor area height is fixed, no matter what value you choose for the field's 'rows' setting.

Solution

in your module add these files.

create ckeditorheight.module file:

<?php

/**
 * @param $libraries
 * @param $extension
 */
function ckeditorheight_library_info_alter(&$libraries, $extension) {
  if ($extension === 'ckeditor' && isset($libraries['drupal.ckeditor'])) {
    $module_path = drupal_get_path('module', 'ckeditorheight');
    assert((bool) $module_path);
    $js_path = "/$module_path/js/ckeditorheight.js";
    $libraries['drupal.ckeditor']['js'][$js_path] = [];
  }
}

create js/ckeditorheight.js file:

Drupal.editors.ckeditor.attach = function(method, drupalSettings, CKEDITOR, $) {
  return function (element, format)
  {
    var toPx = function(value) {
      var element = jQuery('<div style="display: none; font-size: ' + value + '; margin: 0; padding:0; height: auto; line-height: 1; border:0;">&nbsp;</div>').appendTo('body');
      var height = element.height();
      element.remove();
      return height;
    };

    var rows = element.getAttribute("rows");
    if (rows) {
      // Calculate heightInPx.
      drupalSettings.ckeditorheight = drupalSettings.ckeditorheight || {};
      var heightInPx = toPx((rows * 1.5 + 1) + 'em');

      // Override the height.
      var editorSettingsOverrides = {
        height: heightInPx,
        autoGrow_minHeight: heightInPx
      };

      var overriddenEditorSettings = $.extend({}, format.editorSettings, editorSettingsOverrides);
      var overriddenFormat = $.extend({}, format, {editorSettings: overriddenEditorSettings});
    }
    return method.apply(this, [element, overriddenFormat]);
  }
}(Drupal.editors.ckeditor.attach, drupalSettings, CKEDITOR, jQuery);

Next steps

• Clear your Drupal 8 caches. To do this I use this Drush command: drush cr if you don’t currently use Drush, I highly recommend using it, or the Drupal Console.
• Now, go back to your site, and you should be able to see the ckeditor height is changed as  in the picture below.
• I hope you found this article useful. let me know if you have any questions and I’ll be happy to answer them.
• This code can be found and downloaded from https://github.com/codimth/ckeditorheight.