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hook_form_alter() to add placeholder to a text field via custom module

It should be very straightforward and yet, I can’t identify the reason why this doesn’t add a placeholder to a field in a form:

function posts_form_alter(&$form, FormStateInterface $form_state, $form_id) {   if ($form_id == "node_post_form" || $form_id == "node_post_edit_form") {     $form['field_post_subject']['#attributes']['placeholder'] = t("blah");     dpm($form['field_post_subject']);   } }

This confirms that the key placeholder is being set:

enter image description here

The hook_form_alter() works as expected for other things I need to change, except the placeholder. I looked everywhere and it’s always the same solution so I’m wondering what I’m missing?

This article was republished from its original source.
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hook_form_alter() to add placeholder to a text field via custom module

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