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Creator Code-39 in Font CREATING PLUGINS

CREATING PLUGINS
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else { $linkurl = get_permalink($parentID); $title = get_the_title($parentID); $link = '<a href="' . $linkurl . '">' . $title . '</a>'; echo $link; } } // utility function function next_page_flatten_page_list($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; } Once you have the flattened array, it s easy to find the pages adjacent to the current one: you just increase or decrease the array key by one, grab the value, and use that page ID to build a permalink. You could insert Listing 9-5 into your plugin file (next-page/next-page.php), activate it, and use next_link() and previous_link() in your templates. However, what if you wanted to use a character other than an arrow as part of the link text What if you want to use Next and Previous in place of the page titles You d have to edit the plugin. To allow users to change the linked text as well as the characters shown before or after the page titles, you need to add some options. Listing 9-6 shows the revised plugin code, using a single $options array in place of the hard-coded values used in Listing 9-5. Listing 9-6. Using option variables // next_link tag function next_link() { global $post; $options = get_option('next_page'); $exclude = $options['exclude']; $pagelist = next_page_flatten_page_list($exclude); $current = array_search($post->ID, $pagelist); $nextID = $pagelist[$current+1]; $before_link = stripslashes($options['before_next_link']); $linkurl = get_permalink($nextID); $title = get_the_title($nextID); $linktext = $options['next_link_text']; if (strpos($linktext, '%title%') !== false) $linktext = str_replace('%title%', $title, $linktext); $after_link = stripslashes($options['after_next_link']);
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$link = $before_link . '<a href="' . $linkurl . '" title="' . $title . '">' . $linktext . '</a>' . $after_link; echo $link; } // previous_link tag function previous_link() { global $post; $options = get_option('next_page'); $exclude = $options['exclude']; $pagelist = next_page_flatten_page_list($exclude); $current = array_search($post->ID, $pagelist); $prevID = $pagelist[$current-1]; $before_link = stripslashes($options['before_prev_link']); $linkurl = get_permalink($prevID); $title = get_the_title($prevID); $linktext = $options['prev_link_text']; if (strpos($linktext, '%title%') !== false) $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; } // parent_link tag function parent_link() { global $post; $options = get_option('next_page'); $parentID = $post->post_parent; $exclude = array($options['exclude']); 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 $link; }
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Draw Code-39 In Visual C#.NET
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} // utility function function next_page_flatten_page_list($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; } Now that you know how the user will be able to modify the template tags output using options, you need to build the form that will let them save those options to the database.
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Adding an Options Page
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Almost every WordPress plugin involves some sort of option, and that means you ll need to create the form that lets users manage those options. If you went through the process of creating theme functions back in 7, the process for plugins will look very much the same. To add an options page to the main navigation menu, you need two functions. One will display the content of the options page, and the other is a container for the add_options_page() function. Finally, you ll need to add your container function to the admin_menu() hook using add_action(). Listing 9-7 is taken from my Next Page plugin. I ll use this plugin as an example for the next several sections of this chapter, as it illustrates options pages, shortcodes, and template tags. Here, I ve shown the bare minimum that s required to add an options page. In the next section, I ll show you how to fill in the form fields and process the input data into WordPress options. Listing 9-7. An empty options page // Add a new submenu under Options: add_action('admin_menu', 'next_page_add_pages'); function next_page_add_pages() { add_options_page('Next Page', 'Next Page', 'manage_options', 'next-page', 'next_page_options'); } // displays the options page content function next_page_options() { > <div class="wrap"> <form method="post" id="next_page_form" action="options.php"> <h2>Next Page Options</h2> <p> the form fields will go here </p> <p class="submit">
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Encode EAN-13 In Java
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Create EAN / UCC - 13 In .NET Framework
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Code 3/9 Creator In Visual Studio .NET
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