## LoadStart event

`element.on(event: 'loaderstart', handler: function)`

Triggered when the [loader](https://docs.stripe.com/js/elements_object/create.md#stripe_elements-options-loader) UI is mounted to the DOM and ready to be displayed.

**This event is only emitted from the `payment`, `paymentForm`, `linkAuthentication`, and `address` Elements.**

- `event`
  The name of the event.
In this case, `loaderstart`.

- `handler`
  `handler(event) => void` is a **callback function** that you provide that will be called when the event is fired.

When called it will be passed an event object with the following properties:
    - `elementType`
      The type of element that emitted this event.

### Example

```title
Handle an Element loaderstart event
```