fix(cdk/table): ensure CdkTable updates view with OnPush and trackBy #31451
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When CdkTable is used with OnPush change detection and a `trackBy` function, changes to the `dataSource` might not trigger a view update if the `trackBy` function indicates that the rows themselves haven't changed (even if their internal data has). This can leave the data-bound elements within the table rows displaying outdated information. This commit adds `markForCheck()` calls within the `_renderRows` method of `CdkTable`. These calls ensure that when the table's data is updated (even without full row re-creation due to `trackBy`), the component is explicitly marked for change detection. This triggers a re-evaluation of the bindings for all visible rows, ensuring the view remains consistent with the underlying data. Fixes angular#24483
skrtheboss
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mmalerba and
wagnermaciel
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mmalerba
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Aug 11, 2025
mmalerba
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action: merge
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hoping this will also be merged into 20.2 @mmalerba , as of now it's only in main... I have this problem, and hoping it will be resolved before v21 |
mmalerba
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Aug 18, 2025
…trackBy (angular#31451)" This reverts commit 5b45df3.
|
This actually has to be reverted due to introducing an infinite change detection cycle in a google app. We can try to re-land it after investigating the issue |
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Fixes #24483
Description
When
CdkTableis used with theOnPushchange detection strategy and atrackByfunction, changes to thedataSourcemight not trigger a view update if thetrackByfunction indicates that the row instances themselves haven't changed. This can lead to the data-bound elements within the table rows displaying outdated information, even if their underlying data properties have been modified.This PR addresses the issue by adding
_changeDetectorRef.markForCheck()calls within therenderRowsmethod ofCdkTable. These calls ensure that whenever the table's data or row definitions are updated, the component is explicitly marked for change detection. This forces a re-evaluation of the bindings for all visible rows, ensuring the view remains consistent with the latest underlying data.A new test case has been added to
table.spec.tsto specifically verify this behavior in anOnPushcomponent usingtrackBywhen data properties are updated.