Overview of UI components
Magento UI components are used to represent distinct UI elements, such as tables, buttons, dialogs, and others.
Magento UI components are implemented as a standard module named Magento_UI.
To use UI components in your custom module, you need to add a dependency for the Magento_UI module in your component’s composer.json file.
The following XSD file contains rules and limitations shared between all components (both definitions and instance configurations):
<your module root dir>/Magento/Ui/etc/ui_definition.xsd
Extension developers cannot extend this XSD scheme and introduce new components, but can customize existing ones.
In Magento 2 there are basic and secondary UI components.
Basic components are:
All other UI components are secondary.
Basic components are declared in the page layout files; secondary components are declared in the top-level components’ instances configuration files.
You need to configure styles manually for components on the storefront.
When to use UI components?
With Magento, you may apply different approaches to implementing a UI element, and use:
Magento 2 UI component
We recommend using UI components as much as possible and tend to do the same in Magento core.
UI components work well together: they communicate with each other via the uiRegistry service that tracks their asynchronous initialization. Therefore, if we need to extend something that has already been implemented as a hierarchy of UI components or add a new feature that should interact with other UI components, it’s easier and more effective to use a UI component.
What is a UI component?
UI component is a combination of:
XML declaration that specifies the component’s configuration settings and inner structure.
XML is widely used in Magento 2 which allows developers to easily reuse existing functionalities and add customizations.
Compared to XML layouts, UI components use a more semantical approach to declare and configure the user interface.
An instance of a UI component is usually based on the hierarchy of child UI components.
the Form component has Fieldsets, Tabs, and inner fields
the Listing component has Filters, Columns, Bookmark component, and others
A UI component can be bound to one or more HTML templates using the KnockoutJS bindings.
Configuring a UI component
A particular instance of a UI component is defined primarily by the following:
<Magento_Ui_module_dir>/view/base/ui_component/etc/definition.xml: default component configuration. Can be extended in custom modules.
- UI component’s XML declaration.
- Backend/PHP modifiers.
UI component used in the frontend design area
Configured through layout XML.
jsLayoutargument is used to specify information.
1 2 3 4 5 6 7 8 9 <block name="block-name" template="Magento_Module::path_to_template.phtml"> <arguments> <argument name="jsLayout" xsi:type="array"> <item name="components" xsi:type="array"> ... </item> </argument> </arguments> </block>
UI component used in the Adminhtml area
Configured through dedicated XML file (view/…/ui_component/[ui_component_name.xml])
Included in layout XML with uiComponent tag
Things to remember when working with UI components
UI components have different settings:
Configuration settings (their list and names) are different among UI components; these settings contain constants, optional and required settings. Developers need to treat every UI component separately.
Beware of mistakes in XML config:
Surprisingly, most issues occur because of the typos and other mistakes in the UI component’s XML configuration. Naming is critical because UI components are heavily cross-referenced.