mirror of
https://github.com/puppeteer/puppeteer
synced 2024-06-14 14:02:48 +00:00
28 lines
804 B
Markdown
28 lines
804 B
Markdown
|
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
|
||
|
|
|
||
|
|
[Home](./index.md) > [puppeteer](./puppeteer.md) > [EventEmitter](./puppeteer.eventemitter.md) > [once](./puppeteer.eventemitter.once.md)
|
||
|
|
|
||
|
|
## EventEmitter.once() method
|
||
|
|
|
||
|
|
Like `on` but the listener will only be fired once and then it will be removed.
|
||
|
|
|
||
|
|
<b>Signature:</b>
|
||
|
|
|
||
|
|
```typescript
|
||
|
|
once(event: EventType, handler: Handler): EventEmitter;
|
||
|
|
```
|
||
|
|
|
||
|
|
## Parameters
|
||
|
|
|
||
|
|
| Parameter | Type | Description |
|
||
|
|
| --- | --- | --- |
|
||
|
|
| event | [EventType](./puppeteer.eventtype.md) | the event you'd like to listen to |
|
||
|
|
| handler | [Handler](./puppeteer.handler.md) | the handler function to run when the event occurs |
|
||
|
|
|
||
|
|
<b>Returns:</b>
|
||
|
|
|
||
|
|
[EventEmitter](./puppeteer.eventemitter.md)
|
||
|
|
|
||
|
|
`this` to enable you to chain method calls.
|
||
|
|
|