Section Sidebar Menu Expansion #19810
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Introduces an 'events' property to UmbExtensionSlotElement, allowing dynamic assignment and removal of event listeners on extension components. Event listeners are added when extensions are permitted and removed on disconnect, improving extensibility and event handling for extension slots.
Introduces handlers for entity expansion and collapse events in the section sidebar menu. This change enables the menu to respond to expansion state changes by updating the context accordingly.
Introduces a local expansion state to both section sidebar and tree menu item components to prevent unnecessary updates and rerenders. This improves performance by ensuring state updates only occur when needed.
nielslyngsoe
approved these changes
Aug 28, 2025
This was referenced Oct 20, 2025
This was referenced Oct 27, 2025
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This PR adds functionality to remember the Section Sidebar Menu state across sections. It also introduces different contexts to interact with the menu from the backoffice. The state remains synchronized across all contexts. No matter where the state is updated, it will be reflected in the related contexts.
The PR includes a sample playground that demonstrates the current state for the section and across sections via dashboards. It is possible to close any open menu item from the dashboard. The example also registers a "Collapse Menu Item"-entity action to show interaction with a local menu item state.
Demo video of the example:
https://github.com/user-attachments/assets/d1267a87-f76e-42aa-a8d5-aa76e6a53741
Global State
UMB_SECTION_SIDEBAR_MENU_GLOBAL_CONTEXTWraps the entire application and tracks states for all sections.
Section State
UMB_SECTION_SIDEBAR_MENU_SECTION_CONTEXTWraps a section and tracks the state for all menu items inside a section
Menu Item State
UMB_MENU_ITEM_CONTEXTWraps the menu item and tracks the state for this menu item.
Partly fix of #17074
Partly fix of #17076
Additional PRs coming to support deep link into paginated tree structure menus and remembering the last visited item when navigating between sections.