docs: add page NG8115 (uninvokedTrackFunction) #61962
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Pull request that added the diagnostic: angular#60495
eneajaho
approved these changes
Jun 8, 2025
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Thank you Enea! |
JeanMeche
reviewed
Jun 9, 2025
Co-authored-by: Matthieu Riegler <kyro38@gmail.com>
JeanMeche
reviewed
Jun 10, 2025
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| # Uninvoked Track Function | |||
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| This diagnostic detects when a track function is not called in `@for` blocks. | |||
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| This diagnostic detects when a track function is not called in `@for` blocks. | |
| This diagnostic detects when a track function is not invoked in `@for` blocks. |
| ## What's wrong with that? | ||
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| `@for` blocks need to uniquely identify items in the iterable to correctly perform DOM updates when items in the iterable are reordered, new items are added, or existing items are removed. | ||
| Passing just the function name to the track function without invoking the function will make the `@for` loop recreate the list everytime. The function need to be called. |
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This isn't necessarly true, but instead of the tracking value, the diffing algorithm will get the tracking function reference instead, which usally results in the framework logging the NG0955 warning (https://angular.dev/errors/NG0955)
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| Ensure to invoke the track function when you use it in a `@for` to execute the function so the loop can uniquely identify items. | ||
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Suggested change
| Ensure to invoke the track function when you use it in a `@for` to execute the function so the loop can uniquely identify items. | |
| Ensure to invoke the track function when you use it in a `@for` block to execute the function so the loop can uniquely identify items. | |
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Deployed adev-preview for 559c75f to: https://ng-dev-previews-fw--pr-angular-angular-61962-adev-prev-j0evihb3.web.app Note: As new commits are pushed to this pull request, this link is updated after the preview is rebuilt. |
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Adds documentation for
NG8115 (uninvokedTrackFunction)Pull request that added the diagnostic:
#60495
PR Checklist
Please check if your PR fulfills the following requirements:
PR Type
This adds documentation for the extended diagnostic
NG8115 (uninvokedTrackFunction)What is the current behavior?
No diagnostic for
NG8115 (uninvokedTrackFunction)Issue Number: N/A
What is the new behavior?
Adds a diagnostic for
NG8115 (uninvokedTrackFunction)Does this PR introduce a breaking change?
Other information
@eneajaho offered to check this out :0 ty
Fun fact: I noticed this while I was just going to make a change for the incorrect indentation that I did in the second commit lol.