Question

I’m trying to pass some parameter to a function used as callback, how can I do that?

This is my try:

function tryMe(param1, param2) {
  alert(param1 + " and " + param2);
}

function callbackTester(callback, param1, param2) {
  callback(param1, param2);
}

callbackTester(tryMe, "hello", "goodbye");

Answer 1

If you want something slightly more general, you can use the arguments variable like so:

function tryMe(param1, param2) {
  alert(param1 + " and " + param2);
}

function callbackTester(callback) {
  callback(arguments[1], arguments[2]);
}

callbackTester(tryMe, "hello", "goodbye");

But otherwise, your example works fine (arguments[0] can be used in place of callback in the tester)