New option: onBegin(). A custom event before it begins typing

[mattboldt]

This is a continuation of the efforts made by https://github.com/seifsg

Requirements

• Have you viewed your changes locally on the demos page, located on https://github.com/mattboldt/typed.js/blob/master/index.html?

• If necessary, have you added a new demo to the index.html list of demos? If it's an improvement or small addition, have you added it to an existing demo on the demos page?

• If applicable, have you created a fork of the following JSFiddle with your branch's code and your new feature showcased?

Here is the fiddle: https://jsfiddle.net/seifsg/gknstoff/

Description of the Change

I was working on my app and I needed to fire an event just right before it begins typing. I didn't find how so I added it the code. Works fine on my app now.

Also, I have added it to the documentation and the demo.

I hope it helps!

Benefits

New option: onBegin()
A custom function just before it begins typing

Issues

No issues yet.