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# Method name: onCollectionUpdated(event: CollectionUpdatedEvent)

# Method package: wixStoresBackend

# Method menu location: wixStoresBackend --> Events --> onCollectionUpdated

# Method Link: https://dev.wix.com/docs/velo/apis/wix-stores-backend/events/on-collection-updated.md

# Method Description:

An event that fires when a product collection is updated.

The `onCollectionUpdated()` event handler runs when a product collection
 is updated in a store.

> **Note:** Backend events don't work when previewing your site.



# Method Code Examples:

*** Note: do not assume any prop names or enum values other than the ones in the example.

## An event when a product collection is updated

```javascript
// Place this code in the events.js file
// of your site's Backend section.

export function wixStores_onCollectionUpdated(event) {
  let collectionId = event.collectionId;
  let firstUpdatedField = event.updateFields[0];
}

/*  Full event object:
 *
 *  {
 *    "collectionId": "1a2d7e83-4bef-31d5-09e1-3326ee271c09",
 *    "updatedFields": [
 *      "name",
 *      "media"
 *    ]
 *  }
 *
 */
```

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