Cannot read properties of null (reading 'parentElement') in Virtualize interop #65139
Description
Is there an existing issue for this?
- I have searched the existing issues
Describe the bug
On of our components uses a Virtualize component to wrap a list of items that are shown in a dropdown scenario (autocomplete).
The stack trace is:
at Microsoft.JSInterop.JSRuntime.<InvokeAsync>d__23`1[[Microsoft.JSInterop.Infrastructure.IJSVoidResult, Microsoft.JSInterop, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]].MoveNext() at Microsoft.JSInterop.JSRuntimeExtensions.InvokeVoidAsync(IJSRuntime , String , Object[] ) at Microsoft.AspNetCore.Components.Web.Virtualization.VirtualizeJsInterop.InitializeAsync(ElementReference spacerBefore, ElementReference spacerAfter) at Microsoft.AspNetCore.Components.Web.Virtualization.Virtualize`1.<OnAfterRenderAsync>d__65[[<our item>].MoveNext() at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task , ComponentState )
The source seems to be the JS init of Virtualize called in OnAfterRender:
function init(dotNetHelper: DotNet.DotNetObject, spacerBefore: HTMLElement, spacerAfter: HTMLElement, rootMargin = 50): void {
// Overflow anchoring can cause an ongoing scroll loop, because when we resize the spacers, the browser
// would update the scroll position to compensate. Then the spacer would remain visible and we'd keep on
// trying to resize it.
const scrollContainer = findClosestScrollContainer(spacerBefore);
(scrollContainer || document.documentElement).style.overflowAnchor = 'none';
const rangeBetweenSpacers = document.createRange();
if (isValidTableElement(spacerAfter.parentElement)) {
spacerBefore.style.display = 'table-row';
spacerAfter.style.display = 'table-row';
}
const intersectionObserver = new IntersectionObserver(intersectionCallback, {
root: scrollContainer,
rootMargin: `${rootMargin}px`,
});
...
So it appears the spacerAfter.parentElement is the culprit. This is very difficult to reproduce, sorry.
Expected Behavior
No response
Steps To Reproduce
No response
Exceptions (if any)
No response
.NET Version
10.0.0
Anything else?
No response