How to send a callback from a javascript class js

Question

I'm trying to send a callback from a javascript class to its object. I haven't gotten anywhere with it.

class MyClass {
    constructor(param1, param2) {
      // trigger the callback
      this.callback();
   }
}

obj = MyClass({
    parameter1: 'test',
    parameter2: 'test',
    callback() {
        alert('callback received');
    }
});

that's not how you create instances of classes in javascript — Jaromanda X
– Jaromanda X, Commented Oct 19, 2022 at 10:01
What does that mean, "send a callback from a javascript class to its object"? Unclear what you're trying to achieve. — Robby Cornelissen
– Robby Cornelissen, Commented Oct 19, 2022 at 10:03
you're calling new MyClass with an argument, but have no parameters on constructor ... the arguments passed in new MyClass will be parameters on the constructor — Jaromanda X
– Jaromanda X, Commented Oct 19, 2022 at 10:04
this looks like there's some fundamental lack of knowledge around how classes work in JS. MDN is always a reasonably decent starting point: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… see the calcArea and accessors examples there. — Andrea Giammarchi
– Andrea Giammarchi, Commented Oct 19, 2022 at 10:06

Robby Cornelissen · Accepted Answer · 2022-10-19 10:07:33Z

5

You can just pass a callback function as an argument to the constructor:

class MyClass {
  constructor(callback) {
    callback();
  }
}

new MyClass(() => console.log('Called back'));

answered Oct 19, 2022 at 10:07

Robby Cornelissen

98.6k23 gold badges154 silver badges180 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to send a callback from a javascript class js

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related