--- sidebar_label: Locator.on --- # Locator.on() method #### Signature: ```typescript class Locator { on( eventName: K, handler: (event: LocatorEventObject[K]) => void ): this; } ``` ## Parameters | Parameter | Type | Description | | --------- | -------------------------------------------------------------------------------- | ----------- | | eventName | K | | | handler | (event: [LocatorEventObject](./puppeteer.locatoreventobject.md)\[K\]) => void | | **Returns:** this