puppeteer/website/versioned_docs/version-10.1.0/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)