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The Form API

Abstract

Drupal 4.7 and later feature an application programming interface (API) for generating, validating, and processing HTML forms. The form API abstracts forms into a nested array of properties and values. The array is then rendered by the form-rendering engine at the appropriate time while a page is being generated. There are several implications of this approach:
  • • Rather than output HTML, we create an array and let the engine generate the HTML.

  • • Since we are dealing with a representation of the form as structured data, we can add, delete, reorder, and change forms. This is especially handy when you want to modify a form created by a different module in a clean and unobtrusive way.

  • • Any form element can be mapped to any theme function.

  • • Additional form validation or processing can be added to any form.

  • • Operations with forms are protected against form injection attacks, where a user modifies a form and then tries to submit it.

  • • The learning curve for using forms is a little steeper!

Keywords

Theme Function Form Element Application Programming Interface Validation Function Radio Button 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© John K. VanDyk and Matt Westgate 2007

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