plugin-development

Error with Custom Admin Screen in iframe Thickbox

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Interesting question. Investigating it, I’ve found a [wp-hackers] thread by the same Dion Hulse which gives a bit more of information. First, a testing page with a simple link which will open another admin page in a thickbox. add_action(‘admin_menu’, ‘wpse_71437_admin_submenu’); function wpse_71437_admin_submenu() { add_menu_page( ‘TB’, ‘<span style=”color:#e57300;”>Thickbox</span>’, ‘edit_pages’, ‘open_hidden_page_in_thickbox’, ‘wpse_71437_submenu_page’, ”, // no icon 1 … Read more

Adding custom code into header.php using a plugin

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Specifically, I’d like to create a plugin to echo the following in the header immediately after the default stylesheet The preferred way is to enqueue it, with the default/main stylesheet as the dependency. Here’s a demo plugin, with the structure: + plugins/ | +–+ my-ie-style/ | +–+ my-ie-style.php | +–+ css/ | +–+ ie.css where … Read more

How do I handle multiple Submit buttons in plugin’s option page?

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The settings API is crap. I need a long time and need try many until I got this working. My problem was that the values from my inputs never was passed to the validate callback. I end up in using the array method: <input type=”text” name=”foo[bar]” value=”baz” /> If the formular will be send, in … Read more

How does uninstalling WordPress plugins work?

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As explained in my comment in the Question, the error is certainly in how the DROP TABLE is being performed. But answering to How does uninstalling WordPress plugins work?: If we do a register_uninstall_hook in our plugin, the callback is stored in the option uninstall_plugins in /wp-includes/plugin.php. $uninstallable_plugins[plugin_basename($file)] = $callback; update_option(‘uninstall_plugins’, $uninstallable_plugins); In the PHPDoc … Read more

Determine which theme location a wp_get_nav_menu_items is for

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Not sure this is the simplest means, but you could conditionally add the filter to just the location you want to modify via wp_nav_menu_args filter when wp_nav_menu is called, then immediately remove the filter so it isn’t applied to other menus. function wpa108544_nav_menu_args( $args ){ // check if it’s the location we want the filter … Read more

Custom theme sufficient or custom plugin neccessary for this feature set?

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WordPress will not automatically provide these features. From what you are describing, you will want to create custom post types, a taxonomy or two for classification and custom fields for the post types. You COULD build all of this into a WordPress theme but the generally advised approach is to wrap your functionality into one … Read more

In a plugin, why is add_action(‘init’) not executed before the plugin is activated?

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WordPress is an application and everything that is run within that application is called by hooks. Then 2 main hook functions are add_action and add_filter, but as you saw, register_activation_hook and register_deactivation_hook are other functions that are used in the context of activation and deactivation. There exist more hook defining functions, like functions that will … Read more