---
title: Event
slug: web-experimentation/api/Jxoz-event
docTags: 
createdAt: 2026-08-05T20:56:13.000Z
---

The event `eventName` is tracked and associated with the current visitor. The `event` method captures visitor behavior and additional data. You can track clicks and pageviews in Optimizely Web Experimentation without code, but this API call supports tracking other behaviors like watching a video. These events can be used for measuring the results of a campaign or for determining an audience based on behavior.

### Syntax

```javascript
window["optimizely"].push(event);
```

### Parameters

| Parameter and Type        | Child Attribute                        | Description                                                                                                                                                                                                                                                                                                                                                                               |
| ------------------------- | -------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **event** *EventObject*   | N/A                                    | This is an event object. Required.                                                                                                                                                                                                                                                                                                                                                        |
| **type** *string*         | Child attribute of type `EventObject`. | This is a static value that indicates that you're using the `event` function. Required.                                                                                                                                                                                                                                                                                                   |
| **eventName** *string*    | Child attribute of type `EventObject`. | The "API name" for an event created in Web Experimentation, for example, "add\_to\_cart". Required.                                                                                                                                                                                                                                                                                       |
| **tags** EventTag         | Child attribute of type `EventObject`. | A flat object containing metadata about an event (for example, the SKU of the product being purchased). Some keys are reserved. See the following `EventTag` definition for the list of such keys.                                                                                                                                                                                        |
| **revenue** *integer*     | Child attribute of type `EventTag`.    | Used to submit values for the revenue metric. Values of this tag should be integers equal to 100 times the unit value of the relevant currency (for example, dollar, euro). For example, if a conversion results in $75.02 of revenue, then this tag should be included with value 7502.                                                                                                  |
| **value** *number*        | Child attribute of type `EventTag`.    | Used to submit values for numeric metrics that are not revenue. If it is a number, it is included among both `eventMetrics` and `eventFeatures` in the Experimentation Events Export data. If the value is not a number, this tag is still included among the `eventFeatures` present in raw data export, but is not among `eventMetrics` and is not used in computing metric statistics. |
| `_` *string* or *integer* | Child attribute of type `EventTag`.    | You can specify additional properties of your choice.                                                                                                                                                                                                                                                                                                                                     |

### Example call

```javascript
// ensures the optimizely object is defined globally
window['optimizely'] = window['optimizely'] || [];

window["optimizely"].push({
  "type": "event",
  "eventName": "watchedVideo",
  "tags": {
    "title": "Funny Cats",
    "duration": 30,
    "revenue": 5000
  }
});
```