Drupal 7 Module Development

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Chapter 3 First let's look at the following theme_username function's documentation: /** * Format a username. * * @param $variables * An associative array containing: * - account: The user object to format. * - name: The user's name, sanitized. * - extra: Additional text to append to the user's name, sanitized. * - link_path: The path or URL of the user's profile page, home * page, or other desired page to link to for more information * about the user. * - link_options: An array of options to pass to the l() function's * $options parameter if linking the user's name to the user's * page. * - attributes_array: An array of attributes to pass to the * drupal_attributes() function if not linking to the user's page. */ Quite conveniently, theme_username() has a handy $link_path variable that we want to alter to achieve our old-school giggles. Assuming that we've used some other business logic with the user module's hooks to load our GeoCities URL into the user's account (the "hard" part), replacing the link to the user's profile page can be accomplished with the following simple preprocess function: /** * Implements awesomeness with hook_preprocess_username(). */ function retro_preprocess_username(&$variables) { $variables['link_path'] = $variables['account']->geocities_url; } That's it! We don't have to override the user module's theme implementation; we just modify its parameters. Theme overrides While module developers usually don't have to worry about whether a theme overrides a particular theme function or not, it's still important to understand how this mechanism works. [ 69 ]
<strong>Drupal</strong>’s Theme Layer A <strong>Drupal</strong> theme is normally composed of CSS, images, JavaScripts, template files (discussed shortly), a .info file, and a template.php file. The template.php file is analogous to a module's .module file. It contains all of the PHP functions for the theme and is automatically loaded when the theme is initialized. If a theme wants to override a particular theme function, it needs to copy the theme function from its original location and paste it into its template.php file. Then it needs to change the function's prefix from theme to its own name and finally, it needs to start making the desired changes to the function. For example, if the Bartik theme wants to override the theme_menu_local_tasks() function in order to add some markup around the page's tabs, it would copy the entire function from includes/menu.inc, paste it into Bartik's template.php, and rename it to bartik_menu_local_tasks(). Fortunately, when a theme overrides a default theme function, a module's preprocess functions continue to work as normal. Themes also have the ability to create preprocess functions. If the Bartik theme decides to format a user's name in "last name, first name" format, it can implement a bartik_preprocess_username() function. Fortunately, a theme's preprocess functions do not override a module's preprocess functions. All preprocess functions are run; first any module's preprocess functions and then the theme's preprocess function. Template files While theme functions might be the easiest for module developers to understand, template files are the easiest for themers to grasp. When a theme hook is implemented with template files, they are used instead of theme functions. However, from a module developer's standpoint, there is actually a remarkable amount of similarity between template files and theme functions. First, let's take a closer look at template files. Templates are files primarily containing HTML but with some PHP statements mixed in using the template's variables. Instead of declaring a theme_hook_name() function, a module would instead create a hook-name.tpl.php file. The following are the contents of a typical template file, typical-hook.tpl.php:
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www.allitebooks.com
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Drupal 7 Module Development Copyrig
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Foreword Drupal has its roots in th
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About the Authors Matt Butcher is a
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Larry Garfield is a Senior Architec
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John Albin Wilkins has been a web d
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Jojodae Ganesh Sivaji has been invo
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Why Subscribe? • Fully searchable
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Table of Contents Tools for develop
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Table of Contents A shortcut for sy
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Table of Contents Using hook_node_a
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Table of Contents Creating a task 3
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Preface Chapter 5, Building an Admi
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Preface The system for handling thi
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Developing for Drupal 7 Drupal is a
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However, what we do want to start w
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The Operating System Chapter 1 Wind
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Chapter 1 Drupal core is the founda
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Chapter 1 The database We have take
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Chapter 1 The responsibility of the
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Building an Admin Interface Startin
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Building an Admin Interface $items[
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Building an Admin Interface 'access
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Building an Admin Interface Each ar
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Building an Admin Interface Other p
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Building an Admin Interface Each el
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Building an Admin Interface Drupal
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Building an Admin Interface This is
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Building an Admin Interface Form su
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Building an Admin Interface A short
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Building an Admin Interface } retur
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Building an Admin Interface PHP mai
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Building an Admin Interface Impleme
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Building an Admin Interface Debuggi
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Building an Admin Interface This te
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Working with Content Drupal 7 intro
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Chapter 6 The Schema API allows dat
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'fields' => array( 'aid' => array(
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Chapter 6 'fieldable' => TRUE, 'ent
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Chapter 6 The return value from the
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Chapter 6 In our case, we defined t
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Chapter 6 Most entity operations in
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[ 165 ] Chapter 6 This callback sim
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Chapter 6 This page will simply gen
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Chapter 6 This hook defines a new f
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Submit callback The submit callback
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Chapter 6 // Save the initial revis
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Chapter 6 Master/slave database con
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Chapter 6 array($artwork->aid => $a
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Chapter 6 'access arguments' => arr
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Chapter 6 } foreach ($artworks as $
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Creating New Fields In the last cha
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Chapter 7 Although an advanced topi
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Chapter 7 The most important magic
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Chapter 7 } } '#type' => 'select',
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Chapter 7 Exposing fields to the Fo
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Chapter 7 $element['width'] = array
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Chapter 7 if ($widget['type'] == 'd
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Chapter 7 } return; 'field_ui_field
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Chapter 7 } function theme_dimfield
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Chapter 7 } '@height' => $item['hei
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Chapter 7 } else if ($settings['uni
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Chapter 7 We can, of course, have m
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Chapter 7 To demonstrate how entity
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[ 209 ] Chapter 7 Now look at that
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Drupal Permissions and Security Per
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Chapter 8 The preceding code checks
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Chapter 8 If we had accidentally ru
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Chapter 8 The user_access() functio
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In the first case, Are we looking a
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Chapter 8 Declaring your own access
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} Chapter 8 'page callback' => 'exa
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Chapter 8 if (!flood_is_allowed('co
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[ 227 ] Chapter 8 Enabling permissi
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Chapter 8 } $permissions = array( '
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Chapter 8 This approach is the prop
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Chapter 8 Running access checks on
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Chapter 8 Handling AJAX callbacks s
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Chapter 8 As a result, we cannot tr
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Chapter 8 This allows us to pass a
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Node Access Out-of-the-box, Drupal
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Chapter 9 The Node Access API allow
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* - "delete" * - "create" * @param
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Chapter 9 if (!user_access('access
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Chapter 9 } if (module_implements('
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Chapter 9 hook_node_access() is the
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Chapter 9 Note that the {node_acces
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Chapter 9 The basic permission 'cre
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Chapter 9 It is a good idea to writ
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Chapter 9 On node listing pages, th
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Chapter 9 Writing a complete node a
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• Can this user bypass node acces
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Chapter 9 For our test module, we w
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Chapter 9 When hook_node_access_rec
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Chapter 9 A few things to consider
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Chapter 9 Security considerations T
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Chapter 9 Rebuilding the {node_acce
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Chapter 9 Using the new hook_node_a
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Chapter 9 We may alter any element
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Chapter 9 } // Check anonymous user
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Chapter 9 // Check the permission.
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Chapter 9 The key to Devel Node Acc
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Chapter 9 In the preceding case, th
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JavaScript in Drupal JavaScript is
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Chapter 10 Adding JavaScript and CS
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Chapter 10 When a JavaScript librar
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The following code adds a system CS
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Chapter 10 The second argument can
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Chapter 10 From here onwards, when
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Chapter 10 If a renderable array is
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Chapter 10 Drupal specific JavaScri
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Chapter 10 There are three ways var
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Chapter 10 AJAX helpers Included in
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The callback function hello_world_s
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Chapter 10 Once the response is set
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ajax_command_prepend To add content
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Working with Files and Images Drupa
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Chapter 11 It is very important tha
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Chapter 11 In order to open files f
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Chapter 11 Stream wrappers If you'v
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Chapter 11 In some cases you may no
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Chapter 11 A read-only stream wrapp
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Chapter 11 } 'type' => STREAM_WRAPP
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Chapter 11 For full details of thes
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Chapter 11 After this setup, we sta
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Chapter 11 This is all very cool, b
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Chapter 11 This is where you can st
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Chapter 11 • form callback: If yo
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Chapter 11 Finally we can make the
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Chapter 11 Pretty cool right? Howev
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Chapter 11 As you can see, there is
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Installation Profiles This chapter
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Chapter 12 Profile modules and them
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Enabling modules Just like modules
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Chapter 12 • display_name: A huma
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Next, let's create a form to enter
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Chapter 12 Notice that $install_sta
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Chapter 12 Here, the task that sets
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Chapter 12 Each row being added to
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Chapter 12 // URL filter. 'filter_u
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Chapter 12 'locale' => 'en', ), //
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Database Access Although Drupal 7 h
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Appendix A Result objects The retur
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Appendix A The join() methods all r
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[ 369 ] Appendix A The db_insert()
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Appendix A A Merge query says, in e
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Appendix A Slave servers Drupal als
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Security Throughout this book, we h
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Filtering The following guidelines
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First, whenever we write a query ag
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Appendix B There are both RSS feeds
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ajax_command_alert command 309 ajax
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Drupal, subsytems blocks 20 code te
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form handling 229 forms access chec
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K key() method 371 L label property
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evision handling 175 revisions hand
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U unit test 49 update queries 370 u
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Drupal 7 ISBN: 978-1-84951-286-2 Pa
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