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Drupal Module Development - OSI Days 2010
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Drupal Module Development - OSI Days 2010


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Giving a overview of Drupal API and building a drupal module from scratch. Also

Giving a overview of Drupal API and building a drupal module from scratch. Also

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  • 1. Module Development Ipsita Mishra Siva Kumar Epari
  • 2. About Us ●Ipsita Mishra ✔4 years of Drupal experience ✔Tech lead ✔Webadmin & Core member of Drupal Hyderabad ●Siva Kumar Epari ✔2 years of Drupal experience ✔Drupal Developer ✔Webadmin & Core member of Drupal Hyderabad
  • 3. Types of Modules Core Modules Contrib Modules Custom Module
  • 4. Core Modules These are the modules that ships with a Standard Drupal Release. There are Core Optional and Core Required modules. For example: Node User Block System Filter
  • 5. Contrib Modules Over 5800 (as of July 20, 2010) free community- contributed modules, known as contrib modules, are available to alter and extend Drupal's core capabilities and add new features or customize Drupal's behavior and appearance.
  • 6. Popular Contrib Modules These statistics are incomplete; only Drupal websites using the Update Status module are included in the data.
  • 7. Custom Module A Custom module is one which is local to your Drupal Project. It's not yet contributed to the contrib repository.
  • 8. Custom Module(When to write) You need to answer few questions before writing a Custom Module 1. What do you want to achieve by this custom module? 2. Did you search the Contrib Repository to see if a module is already available for that feature? 3. Have you enabled all possible Configurations of the Core & Contrib module to check if they offer you the feature you require? If your answer is, “Yes, I have done enough research and am sure I have to write the code now”, then go ahead ....
  • 9. Custom Module(Why to write) I have 2 reasons to write a Custom module 1. I need a new feature which is not yet available in Drupal, and probably can be contributed as a Contrib Module. 2. I don't want to keep adding additional modules to my site for small tweaks, which I can manage in only one custom module for my website. Don't be too much dependent on Contribs.
  • 10. A simple module directory structure modulename modulename.module
  • 11. ; $Id$ name = Module name description = “Module description” core = Drupal version (e.g.: 5.x, 6.x) package = Package name ; $Id$ name = Text Captcha description = “Text Captcha” core = 6.x package = Osidays
  • 12. new.module <?php // $Id$ function new_form_alter(&$form, &$form_state, $formid){ if(substr($formid, -9) == 'node_form'){ $form['captcha'] = array( '#type' => 'textfield', '#title' => 'Captcha Question : What is 5 + 3?', ); $form['#validate'][] = '_new_validate'; $form['#submit'][] = '_new_submit'; new.module } } function _new_validate($form, &$form_state){ if($form_state['values']['captcha'] != '8'){ form_set_error('captcha', 'Your Captcha answer is wrong! So you are not a human or you don't know counting :D'); } } function _new_submit($form, &$form_state){ drupal_set_message('You are a human!'); }
  • 13. Download examples module from
  • 14.
  • 15. node_example module
  • 16. hook_node_info()
  • 17. hook_access()
  • 18. hook_perm()
  • 19. hook_perm() Output http://localhost/drupal-6.19/admin/user/permissions
  • 20. hook_form()
  • 21. hook_form() Contd...
  • 22. hook_validate()
  • 23. hook_insert()
  • 24. hook_schema()
  • 25. hook_install() hook_uninstall()
  • 26. hook_update() Preventing SQL injection is easy; db_query provides a way to use parametrized queries. Drupal's database functions replace the sprintf-like placeholders with the properly escaped arguments in order of appearance: %d - integers %f - floats %s - strings, enclose in single quotes %b - binary data, do not enclose in single quotes
  • 27. hook_nodeapi()
  • 28. hook_delete()
  • 29. hook_load()
  • 30. hook_view()
  • 31. hook_theme()
  • 32. Theme function
  • 33. Menu System
  • 34. hook_menu()
  • 35. Menu Item Types "type": A bitmask of flags describing properties of the menu item. Many shortcut bitmasks are provided as constants in * MENU_NORMAL_ITEM: Normal menu items show up in the menu tree and can be moved/hidden by the administrator. * MENU_CALLBACK: Callbacks simply register a path so that the correct function is fired when the URL is accessed. * MENU_SUGGESTED_ITEM: Modules may "suggest" menu items that the administrator may enable. * MENU_LOCAL_TASK: Local tasks are rendered as tabs by default. * MENU_DEFAULT_LOCAL_TASK: Every set of local tasks should provide one "default" task, that links to the same path as its parent when clicked. If the "type" key is omitted, MENU_NORMAL_ITEM is assumed.
  • 36. hook_menu_alter()
  • 37. Drupal Blocks
  • 38. hook_block() A Block represents some auxiliary content along with the primary content of the page.
  • 39. The output is themed comment.module
  • 40. Parameters hook_block($op = 'list', $delta = 0, $edit = array())
  • 41. Operation: list
  • 42. Operation: configure
  • 43. Operation: save
  • 44. Operation: view
  • 45. Developer's Tools ● Drush ● Devel and Devel Themer ● Coder ● Admin Menu
  • 46. DRUpal SHell ● drush dl modulename/themename ● drush en modulename/themename ● drush dis modulename/themename ● drush pm-uninstall modulename/themename ● drush cc Resource:
  • 47. Devel ● Devel: Helper functions for Drupal developers. ● Generate content: Accelerate development of your site or module by quickly generating nodes, comments, terms, users, and more. ● Node Access Summary: View the node access entries for the node(s) that are shown on a page.
  • 48. Devel Themer
  • 49. Coder This module helps in Code Review
  • 50. A Sample Analysis by Coder
  • 51. Resources IRC Channel #drupal #drupal-support #drupal-hyderabad
  • 52. Thank You @IpsitaMishra @siva_epari