18

Ok, so I have registered a few custom post types and a few taxonomies. Now, for the life of me, I cannot figure out the code I need to add a Custom Field to my Custom Post Type.

I need a drop down and a single line text area. But I also need to have separate fields for post types. So, say post type one has 3 fields and post type 2 has 4 fields but the fields are different.

Any tips would help I have looked at the codex and found something but cannot make sense of what I need to add to my functions.php file

18

This is probably more complicated than you think, I would look into using a framework:

If you want to write your own , here are some decent tutorials:

  • 1
    really it would be that hard. I thought it would be as simple as adding a register code to my functions like we do with post types and taxonomies. – xLRDxREVENGEx May 13 '11 at 3:07
  • 1
    I'll plus one this answer, but it's not too complex. The thinkvitamin.com link does a great job explaining how to add the metaboxes and save them. The sltaylor.co.uk link is an awesome tutorial on using some great coding practices. My word of caution is be careful when using the save_post hook. It's called at weird times. Make sure to have WP_DEBUG variable set to true in order to see potential errors that arise when using it. – tollmanz May 13 '11 at 3:51
  • 1
    Just an update i used the thinkvitamin link and that helped tremendously and it was a cake walk on setting up custom fields – xLRDxREVENGEx May 13 '11 at 23:31
22

Add/edit the supports argument ( while using register_post_type ) to include the custom-fields to post edit screen of you custom post type:

'supports' => array( 
  'title', 
  'editor', 
  'excerpt', 
  'thumbnail', 
  'custom-fields', 
  'revisions' 
)

Source: https://codex.wordpress.org/Using_Custom_Fields#Displaying_Custom_Fields

  • 2
    Can you please explain why this could solve the issue? – s_ha_dum Apr 23 '13 at 14:57
  • 1
    Yes, this works. Who -1'ed the answer. Can you please take it back? Regards, – Junaid Qadir Jul 25 '13 at 8:59
  • 5
    ...and then.........? – Mark Oct 26 '16 at 18:33
7

Although you should have to add some validation, this action does not seem to be complicated for the current version of WordPress.

Basically you need two steps to add a Custom Field to a Custom Post Type:

  1. Create a metabox which holds your Custom Field
  2. Save your Custom Field to the database

These steps are globally described here: http://wordpress.org/support/topic/is-it-possible-to-add-an-extra-field-to-a-custom-post-type

Example:

Add a Custom Field called "function" to a Custom Post Type called "prefix-teammembers".

First add the metabox:

function prefix_teammembers_metaboxes( ) {
   global $wp_meta_boxes;
   add_meta_box('postfunctiondiv', __('Function'), 'prefix_teammembers_metaboxes_html', 'prefix_teammembers', 'normal', 'high');
}
add_action( 'add_meta_boxes_prefix-teammembers', 'prefix_teammembers_metaboxes' );

If your add or edit a "prefix-teammembers" the add_meta_boxes_{custom_post_type} hook is triggered. See http://codex.wordpress.org/Function_Reference/add_meta_box for the add_meta_box() function. In the above call of add_meta_box() is prefix_teammembers_metaboxes_html, a callback to add your form field:

function prefix_teammembers_metaboxes_html()
{
    global $post;
    $custom = get_post_custom($post->ID);
    $function = isset($custom["function"][0])?$custom["function"][0]:'';
?>
    <label>Function:</label><input name="function" value="<?php echo $function; ?>">
<?php
}

In the second step you have your custom field to the database. On saving the save_post_{custom_post_type} hook is triggered (since v 3.7, see: https://stackoverflow.com/questions/5151409/wordpress-save-post-action-for-custom-posts). You can hook this to save your custom field:

function prefix_teammembers_save_post()
{
    if(empty($_POST)) return; //why is prefix_teammembers_save_post triggered by add new? 
    global $post;
    update_post_meta($post->ID, "function", $_POST["function"]);
}   

add_action( 'save_post_prefix-teammembers', 'prefix_teammembers_save_post' );   
  • "why is prefix_teammembers_save_post triggered by add new?" have you found an answer, i am also stumbling on a extra function trigger which i can't recall? – alex Feb 18 '15 at 5:15
1

There are various plugins for custom meta boxes and custom fields. If you look at a plugin that focuses on developers, then you should try Meta Box. It's lightweight and very powerful.

If you're looking for a tutorial on how to write code for a meta box / custom fields, then this is a good start. It's the first part of a series that might help you refine the code to make it easy to extend.

-5

// slider_metaboxes_html , function for create HTML function slider_metaboxes( ) { global $wp_meta_boxes; add_meta_box('postfunctiondiv', __('Custom link'), 'slider_metaboxes_html', 'slider', 'normal', 'high'); }

//add_meta_boxes_slider => add_meta_boxes_{custom post type} add_action( 'add_meta_boxes_slider', 'slider_metaboxes' );

Perfect knowledge

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