puppeteer/docs/api/puppeteer.page.once.md

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---
sidebar_label: Page.once
---
# Page.once() method
#### Signature:
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```typescript
class Page {
once<K extends keyof PageEventObject>(
eventName: K,
handler: (event: PageEventObject[K]) => void
): this;
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}
```
## Parameters
| Parameter | Type | Description |
| --------- | -------------------------------------------------------------------------- | ----------- |
| eventName | K | |
| handler | (event: [PageEventObject](./puppeteer.pageeventobject.md)\[K\]) =&gt; void | |
**Returns:**
this