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I have a boolean field within my Page content type called Hide Title.

I need to conditionally add a class to h1's to visually hide them if this field is checked.

I have the following within page-title.html.twig

{% set hide_title = content.field_hide_title.0 %}

{% if 'On' in hide_title %}
    <h1 {{ title_attributes.addClass('visually-hidden') }}>{{ title }}</h1>
{% else %}
  <h1{{ title_attributes }}>{{ title }}</h1>
{% endif %}

This is is not adding the class while the boolean is set on or off.

  • Add {{ hide_title }} right after you set it, as a cheap way of finding out what the value you're getting is. – beltouche Mar 22 at 21:40
  • @beltouche Good idea – it's not returning anything, hmm. Tried changing to node.field_hide_title.0 but still nothing. – 4oh3 Mar 22 at 21:50
  • I recommend turning on twig debugging and using dev to dig into the field so you can find what you're looking for. See drupal.org/docs/8/theming/twig/debugging-twig-templates – beltouche Mar 22 at 21:53
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In page-title.html.twig you don't have access to content variable.
according to page-title.html.twig comment section:

Available variables are:

  • title_attributes
  • title_prefix
  • title
  • title_suffix

So you should implement hook_preprocess_HOOK to passe hide_title to your twig like the following:

/**
 * Implements hook_preprocess_HOOK().
 */
function MYMODULE_preprocess_page_title(&$variables) {
  if ($node = \Drupal::routeMatch()->getParameter('node')) {
    $variables['hide_title'] = $node->field_hide_title->value;
  }
}

Now you can do the following in your twig:

{% if hide_title == "1" %}
    <h1 {{ title_attributes.addClass('visually-hidden') }}>{{ title }}</h1>
  {% else %}
    <h1{{ title_attributes }}>{{ title }}</h1>
{% endif %}
  • Now that makes sense, thanks so much! – 4oh3 Mar 23 at 1:10
  • You are welcome, glad that helped! – berramou Mar 23 at 1:13

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