Drupal 7 Module Development

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Chapter 5 '#default_value' => variable_get('user_warn_e-mail_subject', 'Administrative Warning'), '#title' => t('Warning e-mail subject'), '#size' => 40, '#maxlength' => 120, '#required' => TRUE, '#description' => t( 'The subject of the e-mail which will be sent to users.'), ); // Textarea for the body of the e-mail. $form['user_warn_e-mail_text'] = array( '#type' => 'textarea', '#rows' => 10, '#columns' => 40, '#default_value' => variable_get('user_warn_e-mail_text', USER_WARN_MAIL_TEXT), '#title' => t('Warning e-mail text'), '#required' => TRUE, '#description' => t( 'The text of the e-mail which will be sent to users. '), ); // Checkbox to indicate whether admin should be sent a Bcc // on e-mails. $form['user_warn_bcc'] = array( '#type' => 'checkbox', '#default_value' => variable_get('user_warn_bcc', FALSE), '#title' => t('BCC admin on all e-mails'), '#description' => t('Indicates whether the admin user (as set in site configuration) should be BCC\'d on all warning e-mails.'), ); // Submit button $form['submit'] = array( '#type' => 'submit', '#value' => t('Save settings'), ); } return $form; Persistent variables are an excellent way to store module settings and other user-configurable information. However, having given our configuration settings reasonable defaults, we are still left with the issue of how to save changes to these defaults. [ 135 ]
Building an Admin Interface Form submission process When an HTML form built with Form API is submitted, Drupal looks for two specifically named functions—a validate function and a submit function. These functions are named by taking the form ID and appending either _validate() or _submit() depending on which function you are writing. The validate function does additional validation beyond what Drupal provides. For instance if you wanted to check to see if a zip code is valid. Even if validation fails on one element, all validation functions are still called, so Drupal can return multiple errors in a single form. However, if any validation function fails, execution never proceeds to the submit function. Validate functions are optional. If you don't need any additional validation, then you don't have to write one. In this case, Drupal will just do its default validation. For more information on how to write validate functions, see the Form API documentation at the links referenced earlier in the chapter. Once the form passes validation, the submit function is called. This is where the real work is done—saving settings, sending e-mail, and creating content among other things. The form submit function is one of the main workhorses of Drupal modules. As a module writer you will spend an inordinate amount of time writing submit functions and support code for submit functions. This is good, because it means you are spending time on the code that is unique to your project, and not recreating the wheel every time you want to turn a field red because a required field is missing. So let's apply this to the User Warn configuration form. The form ID for our configuration form is user_warn_form, so our submit function will be named user_warn_form_submit(). Form submit functions take two arguments. $form is the original Form API array for the submitted form, and $form_state is an associative array containing information specific to this submission. In particular, $form_state['values'] contains all the submitted form values keyed on their name properties. In general, $form_state['values'] is the only thing you will need to worry about in validate and submit functions. /** * Save configuration settings for User Warn module. */ function user_warn_form_submit($form, &$form_state) { [ 136 ]
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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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Chapter 1 While one could imagine t
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Chapter 1 We assume that you have y
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Chapter 1 The following are a few o
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Creating Your First Module We are g
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Creating Your First Module As obvio
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Creating Your First Module By Drupa
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Creating Your First Module The next
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Creating Your First Module When Dru
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Creating Your First Module Doxygen-
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Creating Your First Module The help
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Creating Your First Module Drupal s
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Creating Your First Module Finally,
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Creating Your First Module Here's o
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Creating Your First Module ); } } r
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Creating Your First Module Not in J
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Creating Your First Module There ar
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Creating Your First Module The exam
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Creating Your First Module Setting
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Creating Your First Module } ); pub
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Creating Your First Module You migh
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Creating Your First Module The repo
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Drupal’s Theme Layer This book is
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Drupal’s Theme Layer There are ac
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Drupal’s Theme Layer Theme engine
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Drupal’s Theme Layer Preprocess f
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Drupal’s Theme Layer A Drupal the
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Drupal’s Theme Layer The theme()
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Drupal’s Theme Layer Now, if you
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Drupal’s Theme Layer A similar pr
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Drupal’s Theme Layer Now, that wa
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Drupal’s Theme Layer • #suffix:
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Drupal’s Theme Layer Two powerful
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Page 115 and 116: Theming a Module After all, if you
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Page 121 and 122: Theming a Module Theming a Drupal b
Page 123 and 124: Theming a Module Converting a theme
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Page 127 and 128: Theming a Module Notice that the .b
Page 129 and 130: Theming a Module } $block['content'
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Page 135 and 136: Theming a Module // Create links fo
Page 137 and 138: Theming a Module } // Load the acco
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Page 143 and 144: Building an Admin Interface Startin
Page 145 and 146: Building an Admin Interface $items[
Page 147 and 148: Building an Admin Interface 'access
Page 149 and 150: Building an Admin Interface Each ar
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Page 161 and 162: Building an Admin Interface A short
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Page 167 and 168: Building an Admin Interface Impleme
Page 169 and 170: Building an Admin Interface Debuggi
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Page 174 and 175: Working with Content Drupal 7 intro
Page 176 and 177: Chapter 6 The Schema API allows dat
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Page 180 and 181: Chapter 6 'fieldable' => TRUE, 'ent
Page 182 and 183: Chapter 6 The return value from the
Page 184 and 185: Chapter 6 In our case, we defined t
Page 186 and 187: Chapter 6 Most entity operations in
Page 188 and 189: [ 165 ] Chapter 6 This callback sim
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Page 196 and 197: Chapter 6 // Save the initial revis
Page 198 and 199: Chapter 6 Master/slave database con
Page 200 and 201: Chapter 6 array($artwork->aid => $a
Page 202 and 203: Chapter 6 'access arguments' => arr
Page 204 and 205: Chapter 6 } foreach ($artworks as $
Page 206 and 207: 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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