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<input type="submit" name="submit" class="button-primary" value="Update Options" /> </p> </form> </div> < php } // end function next_page_options() Unlike the widgets you created in the previous chapter, on the plugin options pages, you do have to define the form and its submit button. The form should always be posted to options.php. This file processes all the WordPress options. Once you have registered your plugin s options (which I ll show you in the next section), you can use just two lines to your form to process them. The wrapper element (<div class="wrap">) is essential to the layout of all WordPress admin pages, so you must include it in your options forms. The form tags should go inside the wrapper. The id attribute is optional, but your form method should be post and the action should always be options.php (the file that processes all WordPress options). The results of Listing 9-7 are shown in Figure 9-3.
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Figure 9-3. The skeleton options page Your form button styles should conform to WordPress standards. You should have one primary button (the one that saves the options, publishes the post, etc.) and it should be styled with the buttonprimary class. All other buttons should use the secondary class. These styles are consistent throughout the WordPress administration screens. The QuickPress Dashboard widget, shown in Figure 9-4, illustrates the contrast between the two button styles.
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Figure 9-4. The secondary (Save Draft, Reset) and primary (Publish) button styles Now that you have an options page in place, it s time to add some fields to the form.
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The Settings API
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WordPress provides a complete framework for setting, updating, and deleting plugin and theme options in the database. The settings API handles a lot of security issues for you (although there are still things for you to check). It also handles most of the work of saving options to the database. All you have to do is register the settings you plan to use, so WordPress knows which ones it should handle. For more information on the Settings API, visit the Codex page at codex.wordpress.org/Settings_API.
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Registering Settings and Creating Defaults
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Prior to version 2.7, you could create options without registering them with WordPress, but then you had to do a lot of manual security checks and updates. With the new settings API, all of that is much easier, but you must register your settings in order for them to work. You may register a separate setting for each variable you need to store, but it s impolite to take up lots of database rows with your plugin s options. Instead, group your variables into arrays, each of which can be stored in a single database row. Listing 9-8 shows the code required to register a single setting. The first argument is the setting s name; the second is the name of the group in which it appears. In this case, you ll have just one group, so the names are the same. Listing 9-8. Registering a setting function register_next_page_options() { register_setting( 'next_page', 'next_page' ); } add_action('admin_init', 'register_next_page_options' ); Registering the setting lets WordPress know that you plan to use it, but it doesn t do anything about setting default values. You ll have to do that yourself. You can use the activation hook to make sure your
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options are set as soon as the plugin is activated. Listing 9-9 shows a function that sets default option values, stored in a single array, when the plugin is activated. Listing 9-9. Setting default options on activation function next_page_activation() { // set defaults $options = array(); $options['before_prev_link'] = '<div class="alignleft">'; $options['prev_link_text'] = __('Previous:', 'next-page').' %title%'; $options['after_prev_link'] = '</div>'; $options['before_parent_link'] = '<div class="aligncenter">'; $options['parent_link_text'] = __('Up one level:', 'next-page').' %title%'; $options['after_parent_link'] = '</div>'; $options['before_next_link'] = '<div class="alignright">'; $options['next_link_text'] = __('Next:', 'next-page').' %title%'; $options['after_next_link'] = '</div>'; $options['exclude'] = ''; // set new option add_option('next_page', $options, '', 'yes'); } register_activation_hook(__FILE__, 'next_page_activation'); The code here is fairly simple; it s just an array in which each element contains the default values for one of the options. Note the use of the add_option() function to save the options array to the database. The add_option() function requires four arguments: The name of the option to be saved Its value An empty string (a deprecated argument kept for backward compatibility) The $autoload variable (This last argument determines whether your options should be loaded into WordPress object cache on each page load. You ll be using these options in template files, so this value should be yes .)
That s it! You ve set the default values, and now it s time to build the form that will let you change those values.
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