I would like to know how to run a function when a meta information of a custom post type is changed.
For example, I have a radio box associated with a custom post type. And made it with metaboxes, and when I change the option, I would like to run a function.
How would I do that?
Originally in OP's question.
I think I found what I wanted
function do_my_stuff($post_ID) {
//do my stuff here;
return $post_ID;
}
add_action('save_post', 'do_my_stuff');
Wordpress: executing function when saving or editing post
But is it possible to track what changes were made?
Yup, did it with your help diggy, but had to change something.
function do_my_stuff($post_ID) {
$newvalue = $_POST['my_metabox_value'];
echo $newvalue;
$oldvalue= get_post_meta($post_id, 'my_metabox_value', true );
echo $oldvalue;
}
add_action('pre_post_update', 'do_my_stuff');
Related
So I'm trying to reference custom field values in a plugin I'm building. All I need to do at this stage is grab the values and store them in variables. This is my code to get the custom field value of pageName:
<?php
global $wp_query;
$postid = $wp_query->post->ID;
$pageName = get_post_meta($postid, 'pageName', true);
wp_reset_query()
?>
So when I try to echo that out, I get nothing. I notice that my plugin runs before the head or anything else, so it's the first code in the source. My hunch is that this is due to timing and the value just isn't there yet. Is there a way to make my plugin, or this chunk of code, wait until the custom field values are there before trying to grab them?
I'm trying to avoid doing anything in the theme files so this can be a stand alone plugin that I can share.
yes, you can get the value of any post meta of the custom post type.
Just make sure that you are receiving the correct post_id in the $postid variable.
If you get the correct id of the post type you can get any meta field
Example:
global $post;
if ($post->ID) {
$media_id_meta = get_post_meta($post->ID, 'media_id', true);
}
Found the solution! I wrapped the whole thing in a function to put it in the footer, which made sure that everything it needed was there.
//----This function is wrapped around the code for my plugin
function dataLayerInject() {
*ALL MY CODE*
}
//----This drops my code into the footer
add_action('wp_footer', 'dataLayerInject');
I am using the save_post action to inspect a metadata field in a custom post and take some action on that value. This is the essential guts of how I am doing it:
add_action('save_post', 'my_save_post');
function my_save_post($post_id)
{
// Check if not autosaving, processing correct post type etc.
// ...
// Get the custom field value.
$my_field_value = get_post_meta($post_id, 'my_field', true);
// Do some action
// ...
}
This works fine when updating the post through the admin page. However, when first creating the post, the my_field_value is always empty. The field does get saved correctly, but this action trigger does not seem to be able to see it, nor any other custom field values.
I would like the action to be performed on all posts of this type created, and I will be importing many through the CSV Imported plugin. Even then, the custom fields do get imported correctly, and the action trigger does get fired for each row imported, but the save_post action still cannot see the custom field value.
So far as I can see from documentation, the post has already been created by the time this action fires, so I should always be able to see that custom metafield.
The answer, it seems, is in the order in which things happen. When creating a post from a form, the custom fields are all collected by the appropriate actions and added to the post before my save_post action fires. This means my trigger is able to see those custom field values.
When importing from CSV, the basic post is created first, and then the custom metafields are added. The save_post trigger fires on the first creation, before the metafields are added, and so the custom field data is not visible to the save_post action.
My solution was to catch the updates of the metadata using the updated_post_meta and added_post_meta actions as well as the save_post action:
add_action('updated_post_meta', 'my_updated_post_meta', 10, 4);
add_action('added_post_meta', 'my_updated_post_meta', 10, 4);
function my_updated_post_meta($meta_id, $post_id, $meta_key, $meta_value)
{
// Make sure we are handling just the meta field we are interested in.
if ($meta_key != 'my_custom_field') return;
if (wp_is_post_revision($post_id)) return;
if (get_post_type($post_id) != 'my_post_type') return;
if (trim($meta_value) == '') return;
// Do my custom task (linking this post to a parent post in a different
// post type). This is the same task performed by the save_post action.
my_link_product_track($post_id, trim($meta_value));
}
That is essentially what I do, and it seems to work well. I do encapsulate all the above into a custom class in the theme, and don't recommend using global scope variables as shown here, but this is just to show the method.
You should look at using $post->ID instead of $post_id -
$my_field_value = get_post_meta($post->ID, 'my_field', true);
get_post_meta in the Codex
EDIT:
Could you do something like this?
if($post->ID == ''){
$pid = $post_id;
} else {
$pid = $post->ID;
}
//$pid = $post->ID or $post_id, whichever contains a value
$my_field_value = get_post_meta($pid, 'my_field', true);
something that looks for a value in $post->ID and $post_id, and uses whichever one isn't blank?
is there a way (plugin) to insert html/css/images ect.. automatically into every wordpress post? most of my posts are going to be very similar so is there a plugin that will automatically insert the pre written html/css/ ect in every post as opposed to me entering it manually every time.
Thank you in advance ;-)
You can write your own simple function for this, see my example below:
add_filter( 'default_content', 'my_editor_content' );
function my_editor_content( $content ) {
global $post_type;
if( $post_type == 'post') { /* Or your custom post type, pages etc. */
$content = 'Your custom HTML/CSS content here';
}
return $content;
}
Place this in functions.php and it will be the default content of every new post/page/custom post type you create.
For a list of available post types, please refer to the Codex
You could use a plugin such as Ad injection, it will allow you to do what you need without having to alter / amend / ad any code to the templates or files
I am using developing a child theme for Woothemes' Canvas.
I am trying to use functions.php in the child theme to only use actions on my custom post type.
This code doesn't seem to be working:
add_action( 'woo_post_inside_after', 'my_geo_mashup' );
function my_geo_mashup() {
echo GeoMashup::map();
if ($post->post_type == 'listings') {
//My function
}
}
add_action( 'woo_post_inside_before', 'listings_nivo' );
function listings_nivo() {
echo do_shortcode('[nivo source="current-post" ]');
if ($post->post_type == 'listings') {
//My function
}
}
So, I'm unsure how to get the above to work properly and only show these items on the custom post type, or only for the custom post type template single-listings.php (as I only want the map and slider to show on the actual post, not on the blog page (archive.php)
Rather than making the entire $post object global, you can just make $post_type global instead. Ex below.
I'm not exactly sure where that function is being loaded, but make sure you hook somewhere within the post. If the action is before, as far as I know and from experience, the post variable will be null.
Just as a test, try running the action in wp_footer Ex. add_action( 'wp_footer', 'listings_nivo' );
See if that yeilds any results.
if echoing var_dump($post) is still null, well, not sure where to go from there.
So you can try running the below, then run the action in the appropriate place if it works:
function listings_nivo() {
echo do_shortcode('[nivo source="current-post" ]');
global $post_type;
// Diagnostic purposes
echo var_dump($post_type);
if ($post_type == 'listings') {
//My function
}
}
add_action( 'wp_footer', 'listings_nivo' );
Check your error log or turn wp_debug to true in your wp-config.php file if nothing else to see if anything else is going on.
Best of luck!
Inside your function, try adding global $post;. Then to see what you are getting with $post->post_type echo it out to the screen. As long as this gives you "listings", your code should work. If not, there's probably another issue at play.
This is what I'm trying to accomplish:
If I'm adding or editing post I want to run a function that puts post_id, all the custom field values and category ids to some other db table I've created.
I just want to know how to execute this function and how to get the values.
Put the following in your functions.php file of your theme. It will run on both save as well as well update. Since you have the post ID, you can do whatever you want.
function do_my_stuff($post_ID) {
//do my stuff here;
return $post_ID;
}
add_action('save_post', 'do_my_stuff');
This was firing twice.
function do_my_stuff($post_ID) {
//do my stuff here;
return $post_ID;
}
add_action('save_post', 'do_my_stuff');
Adding
if (wp_is_post_revision($post_ID)) return;
to suppress revision solved it for me. Maybe you want to suppress more...
// API request
if (REST_REQUEST) return;
// autosave
if (wp_is_post_autosave($post_ID)) return;