function my_function_name() { console.log('get it'); }
var eventname = 'click';
var functionname = 'my_function_name';
document.getElementById('test').addEventListener(eventname, functionname);
If I run those script, I get the following error: "Uncaught TypeError: EventTarget.addEventListener: Argument 2 is not an object."
What I have to do, that I can pass the second parameter of addEventListener as a variable?
You can assign your function to a variable like this
window.my_function_name = function() { console.log('get it'); }
Note that I'm using window object because I don't know how you define your scopes, but I'd suggest that you should keep your function in some other variables
And lastly, to access your function by that function name
document.getElementById('test').addEventListener(eventname, window[functionname]); //don't forget the bracket