There this mousewheel directive that I want to use: <https://github.com/monospaced/angular-mousewheel>

Its docs tells to either attach it to the element as an attribute or a class, 

but I want to attach it to it in my own directive.

```
var myDirective = function() {
    return {
        link: function($scope, elem) {
            elem.bind('>>here<<', function(){});

```

How to do that?