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- Developer Overview
- ##################
- This is a quick developer introduction to Elgg. It covers the basic approach to working with
- Elgg as a framework, and mentions some of the terms and technologies used.
- See the :doc:`/guides/index` for tutorials or the :doc:`/design/index` for in-depth discussion on design.
- Database and Persistence
- ========================
- Elgg uses MySQL 5.5 or higher for data persistence, and maps database values into Entities (a
- representation of an atomic unit of information) and Extenders (additional information and
- descriptions about Entities). Elgg supports additional information such as relationships between
- Entities, activity streams, and various types of settings.
- Plugins
- =======
- Plugins change the behavior or appearance of Elgg by overriding views, or by handling events and plugin hooks.
- All changes to an Elgg site should be implemented through plugins to ensure upgrading core is easy.
- Actions
- =======
- Actions are the primary way users interact with an Elgg site. Actions are registered by plugins.
- Events and Plugin Hooks
- =======================
- Events and Plugin Hooks are used in Elgg Plugins to interact with the Elgg engine under certain
- circumstances. Events and hooks are triggered at strategic times throughout Elgg's boot and execution
- process, and allows plugins to modify or cancel the default behavior.
- Views
- =====
- Views are the primary presentation layer for Elgg. Views can be overridden or extended by Plugins.
- Views are categories into a Viewtype, which hints at what sort of output should be expected by the
- view.
- JavaScript
- ==========
- Elgg uses an AMD-compatible JavaScript system provided by require.js. Bundled with Elgg are jQuery
- 1.11.0, jQuery UI 1.10.4, jQuery Form v20140304, jQuery jeditable, and jQuery UI Autocomplete.
- Plugins can load their own JS libs.
- Internationalization
- ====================
- Elgg's interface supports multiple languages, and uses `Transifex`_ for translation.
- Caching
- =======
- Elgg uses two caches to improve performance: a system cache and SimpleCache.
- .. _Transifex: https://www.transifex.com/projects/p/elgg-core/
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