---
title: Event
summary: An event which takes place in the DOM.
url: https://www.fastly.com/documentation/reference/compute/sdks/javascript/js-compute/globals/interface.Event/
---

**Kind:** Interface  
**Module:** [globals](https://www.fastly.com/documentation/reference/compute/sdks/javascript/js-compute/globals/)  
**Package:** @fastly/js-compute 4.0.1  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2462

An event which takes place in the DOM.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event)

## Constructor

**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2579

```javascript
new Event(type: string, eventInitDict?: EventInit)
```

**Parameters**

- `type`: `string`
- `eventInitDict`: `EventInit` (optional)

## Properties

### bubbles

**Type:** `boolean`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2468

Returns true or false depending on how event was initialized. True if event goes through its target's ancestors in reverse tree order, and false otherwise.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/bubbles)

### cancelBubble

**Type:** `boolean`  
**Flags:** deprecated  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2474

> **DEPRECATED:** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/cancelBubble)

### cancelable

**Type:** `boolean`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2480

Returns true or false depending on how event was initialized. Its return value does not always carry meaning, but true can indicate that part of the operation during which event was dispatched, can be canceled by invoking the preventDefault() method.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/cancelable)

### composed

**Type:** `boolean`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2486

Returns true or false depending on how event was initialized. True if event invokes listeners past a ShadowRoot node that is the root of its target, and false otherwise.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/composed)

### currentTarget

**Type:** `EventTarget | null`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2492

Returns the object whose event listener's callback is currently being invoked.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/currentTarget)

### defaultPrevented

**Type:** `boolean`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2498

Returns true if preventDefault() was invoked successfully to indicate cancelation, and false otherwise.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/defaultPrevented)

### eventPhase

**Type:** `number`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2504

Returns the event's phase, which is one of NONE, CAPTURING_PHASE, AT_TARGET, and BUBBLING_PHASE.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/eventPhase)

### isTrusted

**Type:** `boolean`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2510

Returns true if event was dispatched by the user agent, and false otherwise.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/isTrusted)

### returnValue

**Type:** `boolean`  
**Flags:** deprecated  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2516

> **DEPRECATED:** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/returnValue)

### srcElement

**Type:** `EventTarget | null`  
**Flags:** read-only, deprecated  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2522

> **DEPRECATED:** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/srcElement)

### target

**Type:** `EventTarget | null`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2528

Returns the object to which event is dispatched (its target).

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/target)

### timeStamp

**Type:** `DOMHighResTimeStamp`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2534

Returns the event's timestamp as the number of milliseconds measured relative to the time origin.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/timeStamp)

### type

**Type:** `string`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2540

Returns the type of event, e.g. "click", "hashchange", or "submit".

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/type)

### NONE

**Type:** `0`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2571

### CAPTURING_PHASE

**Type:** `1`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2572

### AT_TARGET

**Type:** `2`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2573

### BUBBLING_PHASE

**Type:** `3`  
**Flags:** read-only  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2574

## Methods

### composedPath

**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2546

```javascript
composedPath(): Array<EventTarget>
```

Returns the invocation target objects of event's path (objects on which listeners will be invoked), except for any nodes in shadow trees of which the shadow root's mode is "closed" that are not reachable from event's currentTarget.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/composedPath)

**Returns**

`Array<EventTarget>`

### initEvent

**Flags:** deprecated  
**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2552

> **DEPRECATED:** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/initEvent)

```javascript
initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void
```

**Parameters**

- `type`: `string`
- `bubbles`: `boolean` (optional)
- `cancelable`: `boolean` (optional)

**Returns**

`void`

### preventDefault

**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2558

```javascript
preventDefault(): void
```

If invoked when the cancelable attribute value is true, and while executing a listener for the event with passive set to false, signals to the operation that caused event to be dispatched that it needs to be canceled.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/preventDefault)

**Returns**

`void`

### stopImmediatePropagation

**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2564

```javascript
stopImmediatePropagation(): void
```

Invoking this method prevents event from reaching any registered event listeners after the current one finishes running and, when dispatched in a tree, also prevents event from reaching any other objects.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/stopImmediatePropagation)

**Returns**

`void`

### stopPropagation

**Source:** https://github.com/fastly/js-compute-runtime/blob/70cf30af4e657879b2d1e7eafab880e39e3a3f7d/types/globals.d.ts#L2570

```javascript
stopPropagation(): void
```

When dispatched in a tree, invoking this method prevents event from reaching any objects other than the current object.

[MDN Reference](https://developer.mozilla.org/docs/Web/API/Event/stopPropagation)

**Returns**

`void`