AngularJS Directive Callback

Question

I would like to send a call back into a directive via a parameter on the tag, and then call that method when appropriate inside the directive. For example, when a button was

Answer 1

Tricky tricky angular, when declaring the argument in the HTML, it needs to use snake case, instead of camelcase to match.

Works:

<hello-world on-load-callback="myCallback(arg1)"></hello-world>

Doesn't Work:

<hello-world onLoadCallback="myCallback(arg1)"></hello-world>

Answer 2

Also the callback needs to be:

scope.onLoadCallback({arg1: 'wtf'});

The named parameters are then bound to the corresponding parameters used in the callback attribute (not all need to be used).