Provide the item rendering support for SSR mode of Virtualize component#66839
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Yuvan111 wants to merge 11 commits into
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Provide the item rendering support for SSR mode of Virtualize component#66839Yuvan111 wants to merge 11 commits into
Yuvan111 wants to merge 11 commits into
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This was referenced Jun 2, 2026
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Provide the item rendering support for SSR mode of Virtualize component
Description
Added a new InitialItemCapacity parameter to the Virtualize component to control the number of items rendered on initial load before viewport measurement.
Introduced a private _isInteractive flag instead of relying on RenderInfo because setting the render mode in OnParametersAsync triggers an initial prerender phase. This causes Virtualize to initialize before JS measurements are available, leading to test failures. The flag ensures virtualization runs only in the interactive state.
Before:
The component had no way to specify the initial item count upfront Initial rendering during SSR could produce suboptimal output since there was no client measurement Empty space might appear before scrolling in interactive modes.
After:
Developers can configure how many items render initially via InitialItemCapacity (defaults to 20)
SSR mode uses this value to generate appropriate initial HTML based on ItemSize and container height
Interactive modes apply this only until the viewport is measured, then adapt automatically
Reduces visible empty space on initial load.
Fixes #57130