# with-overlay

Our `{{with-overlay}}` modifier is a thin wrapper around the excellent `tippy.js`. The most common usage will be something like the below:

```hbs preview-template
<div
  {{did-insert (set this 'popover')}}
>
  The popover
</div>
<button
  {{with-overlay
    this.popover
    returns=(set this 'popoverController')
  }}

  {{on 'click' (fn (optional this.popoverController.show))}}
>
  Click me
</button>
```

The first positional parameter is a reference to a DOM element to use for the
popover. The easiest way to provide this is to use `{{did-insert
(set this 'popoverName'}}}` on any DOM element (as seen above). This DOM element is then
automatically removed from the DOM until the popover needs to be shown.

The `returns` named attribute of the modifer allows you to save a reference to
the overlay itself, which is a reference to a [tippy.js instance](https://atomiks.github.io/tippyjs/v5/methods/).
This instance can then be used with conventional ember to control the overlay. In the example above we use `{{on 'click'}}` to show the overlay but once you have a reference to the tippy.js instance you can control it by any other means.