Drupal 7 Module Development

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Chapter 8 This approach is the proper way to remove form elements from Drupal. You may find yourself tempted to unset() certain form elements, but since Drupal forms are passed by reference through a series of drupal_alter() hooks, the unset() cannot be considered reliable. Using unset() also removes valuable context that other modules may be relying on when processing the $form. Passing secure data via forms As a general rule, Drupal forms do not use the traditional hidden form element of HTML. Since hidden form elements are rendered in the browser, curious users (and malicious ones) can view the elements of a form, checking for tokens and other security devices. Since Drupal is a PHP application, it can use server-side processes to handle secret form elements, rather than relying on information passed as hidden fields from the browser. To pass such data, a form element may be defined as '#type' => 'value'. Using this Forms API element prevents the data from being rendered to the browser. As an additional advantage, it also allows for the passing of complex data—such as an array—during a form request. This technique is commonly used for form elements that the user should never see such as the id of an element to be deleted during a confirmation step. Consider the following code from aggregator.module: function aggregator_admin_remove_feed($form, $form_state, $feed) { return confirm_form( array( 'feed' => array( '#type' => 'value', '#value' => $feed, ), ), t('Are you sure you want to remove all items from the feed %feed?', array('%feed' => $feed->title)), 'admin/config/services/aggregator', t('This action cannot be undone.'), t('Remove items'), t('Cancel') ); } [ 231 ]
Drupal Permissions and Security The form presented to the end user contains no information about the item to be deleted. That data is passed behind the scenes. The form, as displayed to the browser, only contains the data that Drupal needs to validate the form and extract the data from its cache: This action cannot be undone. Cancel The submit handler for the form picks up the data value for processing: /** * Remove all items from a feed and redirect to the overview page. * * @param $feed * An associative array describing the feed to be cleared. */ function aggregator_admin_remove_feed_submit($form, &$form_state) { aggregator_remove($form_state['values']['feed']); $form_state['redirect'] = 'admin/config/services/aggregator'; } [ 232 ]
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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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Drupal’s Theme Layer 'menu_tree__
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Drupal’s Theme Layer If a functio
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Drupal’s Theme Layer We've also s
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Drupal’s Theme Layer Summary You'
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Theming a Module After all, if you
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Theming a Module * Enables a single
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Theming a Module * First draft! * *
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Theming a Module Theming a Drupal b
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Theming a Module Converting a theme
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Theming a Module if (is_array($elem
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Theming a Module Notice that the .b
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Theming a Module } $block['content'
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Theming a Module } 'variables' => a
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Theming a Module } // Theme the use
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Theming a Module // Create links fo
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Theming a Module } // Load the acco
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Theming a Module * - $user: The use
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Theming a Module Summary In this ch
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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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Page 208 and 209: Chapter 7 Although an advanced topi
Page 210 and 211: Chapter 7 The most important magic
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Page 214 and 215: Chapter 7 Exposing fields to the Fo
Page 216 and 217: Chapter 7 $element['width'] = array
Page 218 and 219: Chapter 7 if ($widget['type'] == 'd
Page 220 and 221: Chapter 7 } return; 'field_ui_field
Page 222 and 223: Chapter 7 } function theme_dimfield
Page 224 and 225: Chapter 7 } '@height' => $item['hei
Page 226 and 227: Chapter 7 } else if ($settings['uni
Page 228 and 229: Chapter 7 We can, of course, have m
Page 230 and 231: Chapter 7 To demonstrate how entity
Page 232 and 233: [ 209 ] Chapter 7 Now look at that
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Page 236 and 237: Chapter 8 The preceding code checks
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Page 240 and 241: Chapter 8 The user_access() functio
Page 242 and 243: In the first case, Are we looking a
Page 244 and 245: Chapter 8 Declaring your own access
Page 246 and 247: } Chapter 8 'page callback' => 'exa
Page 248 and 249: Chapter 8 if (!flood_is_allowed('co
Page 250 and 251: [ 227 ] Chapter 8 Enabling permissi
Page 252 and 253: Chapter 8 } $permissions = array( '
Page 256 and 257: Chapter 8 Running access checks on
Page 258 and 259: Chapter 8 Handling AJAX callbacks s
Page 260 and 261: Chapter 8 As a result, we cannot tr
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Page 264 and 265: Node Access Out-of-the-box, Drupal
Page 266 and 267: Chapter 9 The Node Access API allow
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Page 272 and 273: Chapter 9 } if (module_implements('
Page 274 and 275: Chapter 9 hook_node_access() is the
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Page 278 and 279: Chapter 9 The basic permission 'cre
Page 280 and 281: Chapter 9 It is a good idea to writ
Page 282 and 283: Chapter 9 On node listing pages, th
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Page 292 and 293: Chapter 9 A few things to consider
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Page 298 and 299: Chapter 9 Using the new hook_node_a
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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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