Themes
Themes customize the default look and feel of your site. You can define the style and visual identity of your brand or label across your whole site.
You can use a theme CSS client extension instead of a theme for most use cases. Theme CSS client extensions are the preferred way to customize the look and feel of Liferay. Always start with a theme CSS client extension, and only use a theme if there’s something you cannot accomplish with the client extension.
Themes and Site Design
Themes are available and used out-of-the-box on any Site you create. There are also many other ways (such as Style Books) to define the look and feel of your Site, but themes provide the most flexibility when you need a fully customized solution.
Themes are one of the most broad and flexible ways to add customizations, in the hierarchy of ways to design your Site’s appearance. Themes are used for providing the most foundational basis for your Site that more specific tools (such as Master Pages and Style Books) can build on top of. However, you may also use themes to add more customizations that are not possible with those other methods.
Adding customizations to your site through a theme can come with increased maintenance when upgrading from one version of Liferay to another. When possible, manage your site’s appearance through the use of Master Pages Templates and Style Books.
Developing Themes
Themes can be used to customize your Site in a variety of ways, including styling your pages, creating templates, and even extending functionality at runtime.
Styling Your Site
Themes provide the basis for styling on any Site. You can define the UI details for your Site’s pages, customized portlet decorators, and define the color scheme for your Site.
You can also configure a custom Frontend Token Definition based on your theme.
Designing Pages
Themes are also a complement to Page Templates or Master Page Templates for designing a template for your Site’s pages. It can be used in conjunction with these other methods, which add on top of the design from your theme.
For example, you can embed widgets in your theme to make them a permanent fixture of your Site’s pages.
You can also create templates for your pages using Master Pages or Page Templates.
Bundling Resources
Resources may be bundled into your theme or from other sources to bring together many sources of code at once so you can adapt your strategy depending on how you want to deploy different changes.
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Themelets allow the customization of a small number of files, in a modular way that can apply to many themes.
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Theme contributors allow you to package UI resources and customizations that can be deployed independently of a theme.
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The Resources Importer uses Site Templates to import files and content necessary to implement a theme.
The Resources Importer is deprecated as of Liferay DXP 7.1.
Modifying Behavior
Themes are also a powerful tool for modifying the behavior of different parts of your Site.
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You can add context variables usable in your Page Templates so that these templates can hook into the functionality of your theme.
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You can set variable values with your theme to influence the behavior of existing functionality in DXP.
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You can add token definitions that are used to define categories for styling with Style Books.
NoteBeginning with Liferay DXP 2024.Q2/Portal GA120, you can add frontend token definitions in a theme CSS client extension.
Upgrading Themes
The first step to upgrade your theme is to use the Liferay Theme Generator to run the upgrade task. This task updates your theme’s version so that you can deploy it to the new version of DXP. See Upgrading a Theme for more information.
Tools
A variety of tools are used in developing or extending themes. See these topics for more information:
- Liferay Theme Generator
- Blade
- Developer Tools