# Sending Product-View Events

When you need to explicitly send an event to Nosto to tell it that the user has viewed a certain product, you must do so manually. A need for something like this arises when your website has a quick-view function on the category or search pages that enables the customer to preview the product in an overlay without actually navigating to the product page.

```javascript
nostojs(api => {
  api.createRecommendationRequest()
    .setProducts([{product_id: 'product-id-101'}])
    .load();
});
```

**Note:** The example above creates a new request, adds view product event for `product-id-101` and sends the event to Nosto. Since the request did not specify any recommendation slots, this request only submits view event to Nosto.

{% hint style="info" %}
To learn more about the `setProducts` usage, please refer to the [official API documentation](https://nosto.github.io/nosto-js/interfaces/client.RequestBuilder.html#setproducts-1).
{% endhint %}

You can either create an empty request as in the above example and add only the wanted parts to it, or you can create a request based on the tagging on the page by using the `includeTagging` field and then modify it. Here is an example that creates a request using the tagging on the page and then overrides the current tag to be custom color to update the recommendation with id `productpage-nosto-2` to show only products with the same color:

```javascript
nostojs(api => {
  api.createRecommendationRequest({includeTagging:true})
    .setCurrentTags(["color:red"])
    .setElements(["productpage-nosto-2"])
    .load()
    .then(response => {
      console.log(response);
    });
});
```

{% hint style="info" %}
To learn more about the `setCurrentTags` usage, please refer to the [official API documentation](https://nosto.github.io/nosto-js/interfaces/client.RequestBuilder.html#setcurrenttags).
{% endhint %}

In addition to the filtering by product tags, you're also able to filter using product attributes. Here is an example that creates a request using the tagging on the page and then overrides the current tag to be custom color `red`, to update the recommendation with id `productpage-nosto-3` and to show only `cotton` material products for `men` of the same color (`red`):

```javascript
nostojs(api => {
  api.createRecommendationRequest({includeTagging:true})
    .setCurrentTags(["color:red"])
    .addCurrentCustomFields({gender: "male", material: "cotton"})
    .setElements(["productpage-nosto-3"])
    .load()
    .then(response => {
      console.log(response);
    });
```

In many cases leveraging the existing tagging on the page and then overriding the specific parts is simpler and more robust.

{% hint style="info" %}
To learn more about the `addCurrentCustomFields` usage, please refer to the [official API documentation](https://nosto.github.io/nosto-js/interfaces/client.RequestBuilder.html#addcurrentcustomfields).
{% endhint %}

### Attribution for recommended Products

In case the request is built completely manually, it needs to include also the attribution information for click tracking. Below is an example which shows how that can be done for product views that result from clicking on a Nosto recommendation slot.

In the event that the product was viewed due to a click on a Nosto recommendation slot, you must send an additional parameter that denotes the identifier of the recommendation slot that was clicked. If this is done inside of recommendation template identifier of recommendation slot can be get from property `$!product.attributionKey`

```javascript
nostojs(api => {
   var request = api.createRecommendationRequest()
     .setProducts([{product_id: 'product-id-101'}], 'recommendation-id')
     .load();
});
```

**Note:** Failure to do will result in incorrect attribution statistics.

### Sending Product Variant-view Events

Optional event that can be sent to signal that a specific product variant (SKU in Nosto terms) is being viewed. Typical use case for sending this event would be from product detail page when the user selects a product variant, such as some specific color and/or size. The recommendations can then be configured to update and give preference for products that have similar variants available. For example "Other products also available in the same size".

```javascript
nostojs(api => {
  api.createRecommendationRequest({includeTagging:true})
    .setProducts([{product_id: '6961338417345', selected_sku_id: '40822930473153'}])
    .load()
    .then(response => {
      console.log(response);
    });
});
```

## See also

To learn more about the `createRecommendationRequest` usage, please refer to the [official API documentation](https://nosto.github.io/nosto-js/interfaces/client.API.html#createrecommendationrequest).

For more information on `setElements` usage, refer to [this](https://nosto.github.io/nosto-js/interfaces/client.RequestBuilder.html#setelements-1) API documentation