plugin-development - Read For Learn

How to enqueue JavaScripts in a plugin

Your code seems correct, but it will load the script only in admin area beacuse you are enqueuing the script in admin_enqueue_scripts action. To load the script in frontend, use wp_enqueue_scripts action (which is not the same that wp_enqueue_script() function): function Zumper_widget_enqueue_script() { wp_enqueue_script( ‘my_custom_script’, plugin_dir_url( __FILE__ ) . ‘js/jquery.repeatable.js’ ); } add_action(‘wp_enqueue_scripts’, ‘Zumper_widget_enqueue_script’); Also, … Read more

What should I use instead of WP_CONTENT_DIR and WP_PLUGIN_DIR?

Reference file in current path or deeper nested To reference the current path plugin_dir_path( __FILE__ ).”further/nesting/here.css”; which works in Plugins and Themes. Reference URl/URi in a plugin To point to a plugin or theme file, use plugins_url( “path/to/file”, __FILE__ ); which works only in plugins Reference URl/URi in wp-admin folder Always point them to admin_url( … Read more

Why does WordPress add 0 (zero) to an Ajax response?

The default response from admin-ajax.php is, die( ‘0’ ); …by adding your own wp_die() or exit() or die() after returning your desired content prevents the default response from admin-ajax.php being returned as well. It also generally means that your ajax call has succeeded. Ultimately, to answer your question, it’s meant to work this way. What … Read more

add_action hook for completely new post?

add_action(‘new_to_publish’, ‘your_function’); add_action(‘draft_to_publish’, ‘your_function’); add_action(‘pending_to_publish’, ‘your_function’);

Which hook should be used to add an action containing a redirect?

Like kaiser answered template_redirect hook is indeed appropriate for redirects. Also you should use wp_redirect() function, rather than setting header.

Is it mandatory to use $wpdb->prefix in custom tables

It is mandatory, though it is not enforced. Consider the scenario when two WordPress site has been setup in the same database. One with prefix wp_ and another with wp2_. If you install your plugin in both of the sites with the prefix, your created tables will be wp_liveshoutbox for first site and wp2_liveshoutbox for … Read more

“Error: Options Page Not Found” on Settings Page Submission for an OOP Plugin

“Error: Options Page Not Found” Bug This is a known issue in the WP Settings API. There was a ticket opened years ago, and it was marked as solved — but the bug persists in the latest versions of WordPress. This is what the (now removed) Codex page said about this: The “Error: options page … Read more

body_class hook for admin pages

Admin pages don’t use the body_class filter, use the admin_body_class filter to add classes to admin body tag instead. Note that $classes in that case is a string, not an array.

How to change a user’s password programatically

wp_set_password( $password, $user_id ); See reference for details.

Custom pages with plugin

When you visit a frontend page, WordPress will query the database and if your page does not exist in the database, that query is not needed and is just a waste of resources. Luckily, WordPress offers a way to handle frontend requests in a custom way. That is done thanks to the ‘do_parse_request’ filter. Returning … Read more

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