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I followed the documentation on drupal.org to add a field to the theme-settings.php but there must be a mistake in code.

I have a filed called advertisement and a theme called tv so I tried to copy and paste the code and altered the names where to alter theme the files I created in particular are as follows:

/themes/tv/templates/system/thme-settings.php

#}
function tv_form_system_theme_settings_alter(&$form,      
\Drupal\Core\Form\FormStateInterface &$form_state, $form_id = NULL) {
  // Work-around for a core bug affecting admin themes. See issue     
 #943212.
  if (isset($form_id)) {
    return;

$form['tv_advertisement'] = array(
    '#type'          => 'textfield',
    '#title'         => t('Widget'),
    '#default_value' => theme_get_setting('tv_advertisement'),
    '#description'   => t("Place this text in the widget spot on your     
 site."),
  );
}
$tv_advertisement = theme_get_setting('tv_advertisement');

in /themes/tv/config/install/tv.settings.yml I put this:

tv_advertisement: blue bikeshed

My /themes/tv/tv.theme file contains:

<?php
/**
 * @file
 * Theme functions
 */

// Include all files from the includes directory.
$includes_path = dirname(__FILE__) . '/includes/*.inc';
foreach (glob($includes_path) as $filename) {
  require_once dirname(__FILE__) . '/includes/' . basename($filename);
}

 function tv_preprocess_node(&$variables) {
 $variables['tv_advertisement'] =     
 theme_get_setting('tv_advertisement');
 }

The last thing I did was

drush cr 

to clear the cache

When I go to the themes settings page there are only the default fieds displayed but the new one does not show up

If anyone has a clue what I am doing wrong and is able to enlighten me I would be very pleased.

Thank you

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Try to remove this code:

  if (isset($form_id)) {
    return;

The hook interface of hook_form_system_theme_settings_alter is hook_form_system_theme_settings_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state).

You can remove the third parameter:

 $form_id = NULL
  • even if i remove this the variable still ge's not rendered in a twig.html file The settings page looks good but if I use {{tv_advertisement}} in a twig file for example there is no rendering of the var – Josh Apr 9 '17 at 11:39
  • Did you use it in the template node.html.twig or in another template ? I assume if you put it in the preprocess tv_preprocess_node you only get it in node.html.twig. – jBlobsmith Apr 9 '17 at 11:53
  • how to get the variable rendered in other templates? What the name suggestions are or how to determine theme by template names? – Josh Apr 9 '17 at 12:21
  • You can set your debug variable to true like specified in the Drupal documentation -> drupal.org/docs/8/theming/twig/debugging-twig-templates and after go to the generated html to see HOOK in comments. Also, you can see theme hook preprocess explanation in the Drupal documentation api.drupal.org/api/drupal/… – jBlobsmith Apr 9 '17 at 12:31
  • Shorter is better function tv_preprocess_node(&$variables) for node function tv_preprocess_page(&$variables) for page function tv_preprocess_field(&$variables) for field Never thought that this is that simple! :-) – Josh Apr 10 '17 at 10:43

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