Angular, FormArray

Question

In Angular, I have a FormArray with around 21 form controls per row. When I try to load and display 20,000 records, the UI freezes and the API response takes a long time to load and render the data.

Deepika Sawant · Answer

Lazy Load Form Controls Instead of creating all FormGroup s at once, create them on demand as the user scrolls or interacts. Maintain raw data separately. Create FormGroup s only for visible rows. Use Template-Driven Forms for Read-Only Views If the form is mostly for display and occasional edits: Render plain HTML for read-only rows. Convert a row to a reactive FormGroup only when the user clicks "Edit". Paginate the Data Instead of loading 20,000 records at once: Fetch and display data in pages (e.g., 100–500 records per page). Combine with virtual scroll for smoother UX. Debounce and Throttle API Calls If you're fetching data from an API: Use RxJS operators like debounceTime , switchMap , and distinctUntilChanged to reduce load. Consider server-side pagination and filtering. Optimize Change Detection Use ChangeDetectionStrategy.OnPush in your component to reduce unnecessary checks. Detach change detection for parts of the DOM that don’t need frequent updates.

Angular, FormArray

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