Snooper lets you retrieve listeners previously added to elements using addEventListener (and attachEvent on the future).
You can use bower to add it to your project or you can download it from this repository. Load it before any other script that you want to be able to monitor. Example:
<script src="snooper.js"></script>
<script src="main.js"></script>
<script src="modal.js"></script>
When loaded, you will be able to use the following API:
When called with no arguments, returns all the functions that are listening to events. When called with an event name, returns only functions listening to that event.
Example:
function foo() {}
function bar() {}
document.addEventListener('DOMContentLoaded', foo);
document.addEventListener('anotherEvent', bar);
document.getEventListeners(); // [ foo(), bar() ]
document.getEventListeners('anotherEvent'); // [ bar() ]
Lists events which have listeners attached. Example:
function foo() {}
function bar() {}
document.addEventListener('DOMContentLoaded', foo);
document.addEventListener('anotherEvent', bar);
document.getEventsWithListeners(); // [ 'DOMContentLoaded', 'anotherEvent' ]