Firstly, I know that this question or those similar to it have already been asked. And yet I have been banging my head against the wall on this for days. Thus, I am posting my first question.
I have created a custom field for attachment images, for a custom post type, using the extremely helpful tutorial on the process by Andy Blackwell (It is here) employing the attachment_fields_to_edit and attachment_fields_to_save hooks just as he does. I can see that the data makes it to the data base and that it shares the same post id there as the image it is paired with. However, I can not get the data, which for now is simple text, to display with the image. In my plugin I have used the img_caption_shortcode hook to add another figcaption tag and I have tested it with text rather than a variable to make sure that aspect is working - and it is. Additionally, when I type the post id directly into get_post_meta the text also displays. So, I know that my problem is passing the correct id. Never the less I have not succeeded! Your help is greatly appreciated.
Below is my code. $dpi is where I want to store the needed data.
function my_image_attachment_fields_to_edit($form_fields, $post) {
// $form_fields is a special array of fields to include in the attachment form
// $post is the attachment record in the database
// $post->post_type == 'attachment'
// (attachments are treated as posts in Wordpress)
// add our custom field to the $form_fields array
// input type="text" name/id="attachments[$attachment->ID][custom1]"
if( substr($post->post_mime_type, 0, 5) == 'image' ){
$field_value = get_post_meta($post->ID, "_custom1", true);
$form_fields["custom1"] = array(
"label" => __("300dpi Image Name (include extension)"),
"input" => "text", // this is default if "input" is omitted
"value" => $field_value ? $field_value : ''
);
// if you will be adding error messages for your field,
// then in order to not overwrite them, as they are pre-attached
// to this array, you would need to set the field up like this:
//$form_fields["custom1"]["label"] = __("Custom Text Field");
//$form_fields["custom1"]["input"] = "text";
//$form_fields["custom1"]["value"] = get_post_meta($post->ID, "_custom1", true);
return $form_fields;
}
}
// attach our function to the correct hook
add_filter("attachment_fields_to_edit", "my_image_attachment_fields_to_edit", 10, 2);
/**
* @param array $post
* @param array $attachment
* @return array
*/
function my_image_attachment_fields_to_save($post, $attachment) {
// $attachment part of the form $_POST ($_POST[attachments][postID])
// $post attachments wp post array - will be saved after returned
// $post['post_type'] == 'attachment'
;
//if( substr($post->post_mime_type, 0, 5) == 'image' ){
if( isset($attachment['custom1']) ){
// update_post_meta(postID, meta_key, meta_value);
update_post_meta($post['ID'], '_custom1', $attachment['custom1']);
}
return $post;
//}
}
add_filter( 'attachment_fields_to_save', 'my_image_attachment_fields_to_save', 10, 2 );
add_filter( 'img_caption_shortcode', 'my_img_caption_shortcode', 10, 3 );
function my_img_caption_shortcode( $empty, $attr, $content ){
$atts = shortcode_atts( array(
'id' => '',
'align' => 'alignnone',
'width' => '',
'caption' => '',
'class' => '',
), $attr, 'caption' );
$atts['width'] = (int) $atts['width'];
if ( $atts['width'] < 1 || empty( $atts['caption'] ) )
return $content;
if ( ! empty( $atts['id'] ) )
$atts['id'] = 'id="' . esc_attr( $atts['id'] ) . '" ';
$class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );
//$dpi code was here
if ( current_theme_supports( 'html5', 'caption' ) ) {
return '<figure ' . $atts['id'] . 'style="width: ' . (int) $atts['width'] . 'px;" class="' . esc_attr( $class ) . '">'
. do_shortcode( $content ) . '<figcaption class="wp-caption-text">' . $atts['caption'] . '</figcaption>' . '<figcaption class="dpi-link">' . $dpi . '</figcaption></figure>';
}
}
?>
