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Update on.md

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Angelos Chalaris
2018-01-05 18:07:52 +02:00
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Adds an event listener to an element with the ability to use event delegation.
Use `EventTarget.addEventListener()` to add an event listener to an element. If there is a
`target` property supplied to the options object, ensure the event target matches the
target specified and then invoke the callback by supplying the correct `this` context.
Use `options` to pass options to `addEventListener` or omit it to use bubbling by default.
In order to use this function with `off`, the reference to the custom delegator function
is returned if the `target` option is specified. Omit `opts` to default to non-delegation
behavior and event bubbling.
Use `EventTarget.addEventListener()` to add an event listener to an element. If there is a `target` property supplied to the options object, ensure the event target matches the target specified and then invoke the callback by supplying the correct `this` context.
Returns a reference to the custom delegator function, in order to be possible to use with [`off`](#off).
Omit `opts` to default to non-delegation behavior and event bubbling.
```js
const on = (el, evt, fn, opts = {}) => {