puppeteer/website/versioned_docs/version-10.0.0/puppeteer.page.once.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [Page](./puppeteer.page.md) &gt; [once](./puppeteer.page.once.md)

## Page.once() method

<b>Signature:</b>

```typescript
once<K extends keyof PageEventObject>(eventName: K, handler: (event: PageEventObject[K]) => void): EventEmitter;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  eventName | K |  |
|  handler | (event: [PageEventObject](./puppeteer.pageeventobject.md)\[K\]) =&gt; void |  |

<b>Returns:</b>

[EventEmitter](./puppeteer.eventemitter.md)