Reply To: Display custom field value on edit page

• John Huebner

• January 29, 2016 at 10:43 am

Here is a filter that can be adjusted by field type and field name. You can adjust the HTML output as needed.

<?php 
  
  // change the field type to the type
  // of field you want this run on
  // use priority of 1 for before field
  // use priority of 20 for before field  
  add_action('acf/render_field/type=url', 'field_name_render_url_image', 20, 1);
  // change the function name to something unique
  function field_name_render_url_image($field) {
     // change $field name to 
     // the field to add the image to 
    $field_name = 'the_field_name';
    if ($field['_name'] != $field_name) {
      // not our field
      return;
    }
    // uncomment this if you want to see value of $field
    //echo '<pre>'; print_r($field); echo '</pre>';
    // get the post id
    global $post;
    $post_id = $post->ID;
    // get the current value of the field
    // using get_post_meta to avoid confilcts
    $url = get_post_meta($post_id, $field_name, true);
    if (!$url) {
      // nothing has been entered
      ?><p>Enter a URL and Update to View.</p><?php 
      return;
    }
    // make sure the url is an image
    // alter regex to change allowed image extensions
    if (!preg_match('/\.(jpg|jpeg|png|gif)$/i', $url)) {
      // not an image we want to allow
      ?><p>The Entered is Not A Valid Image URL. Enter a Valid Image URL and Update to View.</p><?php 
      return;
    }
    // if we get here then show the image
    ?>
      <img src="<?php echo $url; ?>" />
    <?php 
  } // end function field_name_render_url_image
  
?>