Wrapping Up

Once you've completed all your functions, activate your plugin and try it out! Make sure there is no extra white space after your closing ?> tag, or WordPress will give an error on activation.

Listing 9-16 shows the completed Next Page plugin and Figure 9-6 is a screenshot of the plugin.

Listing 9-16. The complete Next Page plugin

Plugin Name: Next Page

Plugin URI: http://sillybean.net/code/wordpress/next-page/

Description: Provides shortcodes and template tags for next/previous navigation in pages.

Version: 1.4

License: GPLv2

Author: Stephanie Leary

Author URI: http://sillybean.net/

add_action('admin_menu', 'next_page_add_pages');

register_activation_hook(_FILE_, 'next_page_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['before_parent_link'] = '<div class="aligncenter">';

$options['parent_link_text'] = _('Up one level:', 'next-page').' %title%';

$options['before_next_link'] = '<div class="alignright">'; $options['next_link_text'] = __('Next:', 'next-page').' %title%'; $options['after_next_link'] = '</div>';

// set new option add_option('next_page', array_merge($oldoptions, $options), '', 'yes');

// when uninstalled, remove option register_uninstall_hook( _FILE_, 'next_page_delete_options' );

function next_page_delete_options() { delete_option('next_page');

define('WP_PLUGIN_DIR', dirname(dirname(__FILE__))); $lang_dir = basename(dirname(_FILE_)). '/languages';

load_plugin_textdomain( 'next_page', 'WP_PLUGIN_DIR'.$lang_dir, $lang_dir );

add_action('admin_init', 'register_next_page_options' ); function register_next_page_options(){

function next_page_add_pages() {

// Add a new submenu under Options:

$css = add_options_page('Next Page', 'Next Page', 'manage_options', 'next-page', 'next_page_options');

add_action("admin_head-$css", 'next_page_css');

function next_page_css() { ?> <style type="text/css">

#next-page, #parent-page, #previous-page { float: left; width: 30%; margin-right: 5%; }

// displays the options page content function next_page_options() { ?> <div class="wrap">

<form method="post" id="next_page_form" action="options.php"> <?php settings_fields('next_page'); $options = get_option('next_page'); ?>

<h2><?php _e( 'Next Page Options', 'next-page'); ?></h2>

<p><label><?php _e("Exclude pages: ", 'next-page'); ?><br /> <input type="text" name="next_page[exclude]" id="exclude"

value="<?php echo $options['exclude']; ?>" /><br /> <small><?php _e("Enter page IDs separated by commas.", 'next-page'); ?></small></label></p>

<div id="previous-page">

<h3><?php _e("Previous Page Display:", 'next-page'); ?></h3> <p><label><?php _e("Before previous page link: ", 'next-page'); ?><br /> <input type="text" name="next_page[before_prev_link]" id="before_prev_link"

value="<?php echo stripslashes(htmlentities($options['before_prev_link'])); ?>" /> </label></p>

<p><label><?php _e("Previous page link text: <small>Use %title% for the page title</small>", 'next-page'); ?><br />

<input type="text" name="next_page[prev_link_text]" id="prev_link_text"

value="<?php echo stripslashes(htmlentities($options['prev_link_text'])); ?>"

<p><label><?php _e("After previous page link: ", 'next-page'); ?><br /> <input type="text" name="next_page[after_prev_link]" id="after_prev_link"

value="<?php echo stripslashes(htmlentities($options['after_prev_link'])); ?>" /> </label></p>

<p><?php _e('Shortcode:'); ?> <strong>[previous]</strong><br />

<?php _e('Template tag:'); ?> <strong>&lt;?php previous_link(); ?&gt;</strong></p>

<div id="parent-page">

<h3><?php _e("Parent Page Display:", 'next-page'); ?></h3>

<p><label><?php _e("Before parent page link: ", 'next-page'); ?><br />

<input type="text" name="next_page[before_parent_link]" id="before_parent_link"

value="<?php echo stripslashes(htmlentities($options['before_parent_link'])); ?>" /> </label></p>

<p><label><?php _e("Parent page link text: <small>Use %title% for the page title</small>", 'next-page'); ?><br />

<input type="text" name="next_page[parent_link_text]" id="parent_link_text"

value="<?php echo stripslashes(htmlentities($options['parent_link_text'])); ?>" /> </label></p>

<p><label><?php _e("After parent page link: ", 'next-page'); ?><br /> <input type="text" name="next_page[after_parent_link]" id="after_parent_link"

value="<?php echo stripslashes(htmlentities($options['after_parent_link'])); ?>" /> </label></p>

<p><?php _e('Shortcode:'); ?> <strong>[parent]</strong><br />

<?php _e('Template tag:'); ?> <strong>&lt;?php parent_link(); ?&gt;</strong></p>

<h3><?php _e("Next Page Display:", 'next-page'); ?></h3> <p><label><?php _e("Before next page link: ", 'next-page'); ?><br /> <input type="text" name="next_page[before_next_link]" id="before_next_link"

value="<?php echo stripslashes(htmlentities($options['before_next_link'])); ?>" /> </label></p>

<p><label><?php _e("Next page link text: <small>Use %title% for the page title</small>", 'next-page'); ?><br />

<input type="text" name="next_page[next_link_text]" id="next_link_text"

value="<?php echo stripslashes(htmlentities($options['next_link_text'])); ?>"

<p><label><?php _e("After next page link: ", 'next-page'); ?><br /> <input type="text" name="next_page[after_next_link]" id="after_next_link"

value="<?php echo stripslashes(htmlentities($options['after_next_link'])); ?>"

<p><?php _e('Shortcode:'); ?> <strong>[next]</strong><br />

<?php _e('Template tag:'); ?> <strong>&lt;?php next_link(); ?&gt;</strong></p>

<p class="submit">

<input type="submit" name="submit" class="button-primary" value="<?php _e('Update Options', 'next-page'); ?>" /> </p> </form> </div>

} // end function next_page_options() // make the magic happen function next_page_flatten_page_list($exclude = '') {

$args = 'sort_column=menu_order&sort_order=asc'; if (!empty($exclude)) $args .= '&exclude='.$exclude; $pagelist = get_pages($args); $mypages = array(); foreach ($pagelist as $thispage) { $mypages[] = $thispage->ID;

return $mypages;

function next_link() { global $post;

$pagelist = next_page_flatten_page_list($exclude);

$before_link = stripslashes($options['before_next_link']);

$linkurl = get_permalink($nextID);

$linktext = str_replace('%title%', $title, $linktext); $after_link = stripslashes($options['after_next_link']);

$link = $before_link . '<a href="' . $linkurl . '" title="' . $title . '">' . $linktext . '</a>' . $after_link; echo $link;

function previous_link() { global $post;

$pagelist = next_page_flatten_page_list($exclude);

$before_link = stripslashes($options['before_prev_link']);

$linkurl = get_permalink($prevID);

$linktext = str_replace('%title%', $title, $linktext); $after_link = stripslashes($options['after_prev_link']);

$link = $before_link . '<a href="' . $linkurl . '" title="' . $title . '">' . $linktext . '</a>' . $after_link; echo $link;

function parent_link() { global $post;

$options = get_option('next_page'); $parentID = $post->post_parent;

if (in_array($parentID, $exclude)) return false; else {

$before_link = stripslashes($options['before_parent_link']); $linkurl = get_permalink($parentID); $title = get_the_title($parentID); $linktext = $options['parent_link_text']; if (strpos($linktext, '%title%') !== false)

$linktext = str_replace('%title%', $title, $linktext); $after_link = stripslashes($options['after_parent_link']);

$link = $before_link . '<a href="' . $linkurl . '" title="' . $title . '">' . $linktext . '</a>' . $after_link;

echo $link;

Figure 9-6. The previous and next page links
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