32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
---
|
|
sidebar_label: EventEmitter.on
|
|
---
|
|
|
|
# EventEmitter.on() method
|
|
|
|
Bind an event listener to fire when an event occurs.
|
|
|
|
#### Signature:
|
|
|
|
```typescript
|
|
class EventEmitter {
|
|
on<Key extends keyof EventsWithWildcard<Events>>(
|
|
type: Key,
|
|
handler: Handler<EventsWithWildcard<Events>[Key]>
|
|
): this;
|
|
}
|
|
```
|
|
|
|
## Parameters
|
|
|
|
| Parameter | Type | Description |
|
|
| --------- | --------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------ |
|
|
| type | Key | the event type you'd like to listen to. Can be a string or symbol. |
|
|
| handler | [Handler](./puppeteer.handler.md)<[EventsWithWildcard](./puppeteer.eventswithwildcard.md)<Events>\[Key\]> | the function to be called when the event occurs. |
|
|
|
|
**Returns:**
|
|
|
|
this
|
|
|
|
`this` to enable you to chain method calls.
|