Drupal 7 Module Development

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JavaScript in Drupal JavaScript is used in Drupal like in most other web applications. It is used to power features such as the overlay, autocomplete, drag and drop, and so on. This chapter will focus on the JavaScript integration into Drupal and how to use the JavaScript helpers. Some of the important topics this chapter will cover are: • How to add JavaScript to pages through Drupal • Altering JavaScript added to a page by Drupal core and other modules • Using the helper functions built into Drupal • Working with theming and translations in JavaScript • Working with AJAX and Drupal By the end of this chapter you should have the base knowledge to work with JavaScript within Drupal. JavaScript inside Drupal JavaScript is an integral part of Drupal providing dynamic features, a unique administration experience, and a library of JavaScript for module developers to use. The jQuery JavaScript framework comes bundled with Drupal along with several jQuery plugins. JavaScript is provided using the Library API which is available for modules to take advantage of. Along with jQuery 1.4.4 the following plugins are provided by Drupal: • jQuery UI 1.8.6 • jQuery Cookie, a simple, lightweight utility plugin for reading, writing, and deleting cookies
JavaScript in Drupal • jQuery Form, a plugin to easily and unobtrusively upgrade HTML forms to use AJAX • iQuery Once, which filters out all elements that had the same filter applied to them previously • jQuery BBQ, a back button and query library • Farbtastic, a color wheel Adding JavaScript Most of the JavaScript written for Drupal utilizes jQuery but it is not a requirement. When JavaScript is added to the page there are some things to be aware of. Drupal sets jQuery up to use its no conflict mode. This means that the $ variable is relinquished so Drupal can work with other JavaScript libraries that may use the $ variable. More detail is available at http://api.jquery.com/jQuery.noConflict. In the absence of $ there are two methods for writing JavaScript that use jQuery. The first is to use jQuery in any place where you may have used the $. For example: jQuery().ready(function() { ... }); The other way is to wrap your code in an anonymous function and choose an alias. For example: (function($) { $().ready(function() { ... }); })(jQuery); In this case jQuery is passed in with the alias of $. Technically, $ can be replaced with a different valid alias of your choice. This works for JavaScript within a file or when placed inline on the page. Drupal has the ability to preprocess JavaScript files where multiple files are converted into fewer files. Preprocessing provides a performance improvement for end uses as they have fewer files to download. For the preprocessor to create valid JavaScript it is recommended that at places where optional JavaScript semicolons are allowed, they should be used. In the preceding example, the semicolon after the closing (jQuery) is an example of where to use the optional semicolons. [ 288 ]
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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 => $a
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Chapter 6 'access arguments' => arr
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Chapter 6 } foreach ($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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Page 292 and 293: Chapter 9 A few things to consider
Page 294 and 295: Chapter 9 Security considerations T
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Page 298 and 299: Chapter 9 Using the new hook_node_a
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Page 306 and 307: Chapter 9 The key to Devel Node Acc
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Page 332 and 333: Chapter 10 Once the response is set
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Page 338 and 339: Chapter 11 It is very important tha
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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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