11.0.x

Retrieve and Display Forms

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Validate a Single Form Element

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Validate a Form via the Form Controller

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Add a Validation Callback to an Existing Form

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Validate Form Input

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Process Submitted Form Data via the Form Controller

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Process Submitted Form Data with a Callback

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Handle Submitted Form Data

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Form API Overview

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Drupal's Form API is a set of interfaces, utility classes, and conventions that when combined together allow module developers to create forms that collect, validate, and process user-submitted data. The Form API is closely related to the Render API.

Form API Life Cycle

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