How to override a field placeholder when rendering an AC form

Created by Phil Kurth, Modified on Mon, 4 Jul, 2022 at 3:43 PM by Phil Kurth

To modify a field's placeholder when rendering an ACF form, you may use the af/field/before_render filter. This filter provides an opportunity to modify the field array before a form is rendered.

add_filter( 'af/field/before_render', function ( $field, $form, $args ) {
  // If we need to run this only on a specific form, check for the form key.
  if ( $form['key'] !== 'YOUR_FORM_KEY_HERE' ) {
    return $field;
  }

  // Set the placeholder on a specific field.
  if ( $field['name'] === 'email' ) {
    $field['placeholder'] = 'Enter your email address';
  }

  return $field;
}, 10, 3 );