> For the complete documentation index, see [llms.txt](https://help.konnektive.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.konnektive.com/konnektive-crm/crm-setup/campaign-setup/landing-page-setup-form-code/upsell-selection-on-an-upsell-page-for-devs.md).

# Upsell Selection on an Upsell Page (For Devs)

You may have an upsell page displaying multiple products instead of one product.

Include the following javascript on the upsell page:

```
    function selectProduct(i)
      {
       document.getElementById('productIdInput').value = i;
       kform.validator.formSubmit();
      }
```

Inside of the form tag include:

```
    <input id="productIdInput" name="productId" value="" type="hidden">
```

Wrap the button in div:

```
    <div onclick="selectProduct(35)"></div>
```

35 in this example is the campaign product ID number.