28 lines
804 B
Markdown
28 lines
804 B
Markdown
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[Home](./index.md) > [puppeteer](./puppeteer.md) > [EventEmitter](./puppeteer.eventemitter.md) > [once](./puppeteer.eventemitter.once.md)
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## EventEmitter.once() method
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Like `on` but the listener will only be fired once and then it will be removed.
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<b>Signature:</b>
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```typescript
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once(event: EventType, handler: Handler): EventEmitter;
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```
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## Parameters
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| Parameter | Type | Description |
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| --- | --- | --- |
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| event | [EventType](./puppeteer.eventtype.md) | the event you'd like to listen to |
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| handler | [Handler](./puppeteer.handler.md) | the handler function to run when the event occurs |
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<b>Returns:</b>
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[EventEmitter](./puppeteer.eventemitter.md)
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`this` to enable you to chain method calls.
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