You can’t pass an argument to the callback function. add_menu_page() adds it as an action handler, and admin.php fires the action, without any arguments. I see two simple solutions to this problem. One is to store all filename in an array in your class, indexed by hook name. Then you can use this to look … Read more
try replacing : register_widget(‘States_Widget’); with: add_action(‘widgets_init’, ‘register_states_widget’); function register_states_widget() { register_widget(‘States_Widget’); }
From WordPress-codex about dbDelta: The dbDelta function examines the current table structure, compares it to the desired table structure, and either adds or modifies the table as necessary, so it can be very handy for updates (see wp-admin/upgrade-schema.php for more examples of how to use dbDelta). Note that the dbDelta function is rather picky, however. … Read more
add_filter() and add_action() are available before any plugin is loaded. So you can use both in the first line of your plugin or theme. For readability I recommend to group action and filter registrations at the very top of your main file: in a plugin, the file with the plugin header in a theme the … Read more
I did battle with a similar situation recently. Ajax in widgets is no joke! Need to write some pretty crazy code to get things to work across instances. I’m not familiar with live query, but if you say it checks the DOM every second, I might have a less intense solution for you: var get_widget_id … Read more
The action hook admin_bar_menu does the job. Here’s what the comment in the core file says: It includes the action “admin_bar_menu” which should be used to hook in and add new menus to the admin bar. That way you can be sure that you are adding at most optimal point, right before the admin bar … Read more
Best practice method Have a look at wp_localize_script, which is meant to do exactly that. But it does require previous usage of wp_enqueue_scripts, hence you will need to move your JS to a separate file indeed. It will be worth those few minutes of effort though, for sure. function wpse_96370_scripts() { if ( is_single() ) … Read more
In a subdirectory within your plugin directory you can use the following code: $this->plugin_location = plugin_dir_url(dirname(__FILE__));
My guess is you get a PHP error, which generates output before the headers are sent. If you have E_NOTICE enabled, calling $_POST[‘foo’] may generate a “Notice: undefined variable” error if that variable is not set. Best practice: never assume anything about GET, POST, COOKIE and REQUEST variables. Always check first using isset() or empty(). … Read more
This function and activation hook prevents the plugin from activating and allows you to check for both a minimum PHP and WordPress version. register_activation_hook( __FILE__, array( ‘Your_Plugin_Class_Name’, ‘activate’ ) ); /** * Plugin Activation hook function to check for Minimum PHP and WordPress versions * @param string $wp Minimum version of WordPress required for this … Read more